CLEANER ENERGYPRODUCTION IN INDUSTRIAL RECYCLING NETWORKS Jouni Korhonen1,* and Ilkka Savolainen2 1University of Joensuu, Finland 2VTT Energy, Finland, and Helsinki University of Technol
Trang 1CLEANER ENERGY
PRODUCTION IN INDUSTRIAL
RECYCLING NETWORKS
Jouni Korhonen1,* and Ilkka Savolainen2
1University of Joensuu, Finland
2VTT Energy, Finland, and Helsinki University of Technology, Finland
This paper considers the possibility to
develop cleaner energy production with
a perspective on regional material and
energy flow management The
co-production method of district and
industrial heat/steam and electricity (of
heat and power, CHP) using renewable
or waste fuels is viewed as a physical
anchor tenant function for locally based
industrial recycling networks Arguably,
this production method may be used to
enhance the integration of producers as
well as end-consumers into a local
recycling network of matter and energy
Copyright © 2001 John Wiley & Sons,
Ltd and ERP Environment
Received 19 June 2000
Revised 17 January 2001
Accepted 27 March 2001
INTRODUCTION
It has been possible to follow the
philoso-phy of unlimited growth of throughput in
societal systems, which relies on
unsus-tainable use of renewable flow resources and especially on non-renewable stock resources, i.e the fossil raw materials In many indus-trial countries these resources are imported and the local natural limiting factors have not been the determining factor in the develop-ment of the regional industrial systems In-dustrial systems are not adapting to the local environmental conditions and constraints The question of societal energy production and use is one of the most severe environ-mental questions of today, because it is still largely based on the non-renewable stock re-sources of fossil coal, oil and gas and because
it generates CO2emissions to the atmosphere creating the risks involved in the changing of the climate The use of fossil fuels contributes also to many other environmental problems such as acidification, eutrophication and for-mation of tropospheric ozone and also
weak-ens the air quality (Linden, 1994; Hayes et al.,
1997) Energy is produced and consumed practically everywhere in the world and ev-ery regional industrial system has its own energy supply arrangements
In this article, we consider the possibility
of enhancing the emergence of cleaner energy production strategies in a regional context In the first part the co-production method of district heat, industrial heat and steam and electricity (CHP, heat and power) is pre-sented as a potential driver of a local recy-cling network Then some conditions of success of the application of CHP as well as
* Correspondence to: Dr Jouni Korhonen, Department of
Eco-nomics, University of Joensuu, PO Box 111, 80101 Joensuu,
Finland.
Trang 2barriers to the further development of
re-gional material flow management around
CHP are discussed
ON ENERGY AND INDUSTRIAL
ENVIRONMENTAL MANAGEMENT
Approximately 80% of global energy
produc-tion is based on the burning of fossil coal, oil
and gas These resources are non-renewable
and their use generates carbon dioxide (CO2)
and sulphur dioxide (SO2) and other emission
such as NOxand particulates Greenhouse gas
emissions, notably CO2, from industrialized
countries are limited by the Kyoto Protocol to
the UN Convention on Climate Change The
emissions of industrialized countries should
be reduced by 5% on average from the level
of 1990 The commitment period for the task
is from 2008 to 2012 The EU should reduce its
emissions by 8% However, in the long run,
much deeper emission reductions will be
re-quired to prevent the progress of climate
change SO2 and NOx emissions of European
countries are controlled by the Gothenburg
1999 Protocol of the Long Range
Trans-boundary Air Pollution Convention of the UN
Economic Commission of Europe The
Proto-col limits the emissions of SO2 by 63% of the
1990 level and NOx by 41% of the 1990 level
by the year 2010 One can note that the
con-cern of the environmental impacts of the
emissions has manifested itself in emission
limits targeted for countries and country
groups
The main task of environmental
manage-ment in the case of industrial energy question
is to develop cleaner energy production
strategies with the aim in reducing the use of
non-renewable fossil stock inputs as fuels and
reducing the waste and emission outputs The
direction to go in is to substitute
non-renew-able stock resources with renewnon-renew-able natural
flow resources by respecting the natural
re-newal rate of the flows In the substitution
also the use of waste material and residual
energy can be considered By substituting
non-renewables with renewable flows and
with (renewable) wastes the industrial activity
can reduce its burden on the non-renewable
stocks This would also result in the reduction
of waste and emission outputs, because the burning of fossil fuels would be minimized
CO-PRODUCTION OF HEAT AND ELECTRICITY FOR REGIONAL MATERIAL AND ENERGY FLOW MANAGEMENT
A regional support system
In this part, regional material and energy flow management for industrial and consumption systems of energy is considered with the aim
in reducing the use of fossil fuels and the generation of wastes and emissions.1 The re-gional context is the one where practical deci-sions and implementation of environmental policy and cleaner energy production will take place A regional context may also be fruitful for the implementation of cleaner pro-duction initiatives as here the regional actors may face common pressures for environmen-tal management or common environmenenvironmen-tal and economic goals Possibly a common agenda for the regional environmental pro-gramme could be developed in this way The practical side of the concept of indus-trial ecology (IE, Frosch and Gallopoulos, 1989; Graedel and Allenby, 1995; Ayres and Ayres, 1996) aims to facilitate the emergence
of a local industrial system, which is based on co-operation between the actors involved in material and energy flow management The idea is to create value for waste flows and use waste in the industrial activity as a resource input The literature in IE seems to agree that there is a need to identify a certain key orga-nization in the region around which an ‘in-dustrial ecosystem’, i.e a recycling network of industrial actors, could emerge Such a key activity has been called as a ‘symbiosis insti-tute’ (Baas, 1998), a ‘support system’ (Boons and Baas, 1997; Baas, 1998), an ‘anchor tenant’ (Lowe, 1997; Chertow, 1998; Cote and
Cohen-Rosenthal, 1998; Korhonen et al., 1999), an
‘initiator’ (Brand and de Bruijn, 1999), ‘a
1 For a discussion on various conceptual approaches to regional metabolism and regional material flow management see
Brun-ner et al (1994), Burstro¨m (1999a,b), Baccini et al (1993).
Trang 3process unit’ (Wallner, 1999) or a ‘separate
co-ordinating unit’ (Linnanen, 1998)
One can define two general types of this kind
of support system of regional material and
energy flow management or of regional
indus-trial ecology, an institutional support and a
physical support system (Burstro¨m and
Kor-honen, 2001) By institutional support we
un-derstand political and regulatory or decision
making support, information management,
so-cial and economic infrastructure building and
education i.e activities that could suit the
everyday activity of a local public authority
such as a local municipality organization In
this article, we are going to focus on what we
see as a potential physical anchor tenant activity
or an entity in regional material and energy
flow management By a physical support
sys-tem we denote the role of an actor in the region
that is the driver of some of the main physical
material and energy flows of the region In
theory, this actor can serve as the key activity
around which the main material and energy
flows can be arranged, and hence, through
environmentally orientated schemes,
con-trolled and reduced
Co-production of heat and electricity
Only in three countries in the world, Finland,
Denmark and the Netherlands, have the
re-gional energy supply systems been arranged to
large national scale according to the
co-produc-tion principle of heat and electricity (CHP,
Cogen, 1997; Korhonen et al., 1999, 20012;
Lehtila¨ et al., 1997) In this production method,
the waste energy from electricity production is
cascaded (for discussion on resource cascading
see, Sirkin and ten Houten, 1994) and used in
the production of district heat for local
house-holds or is used to satisfy the industrial heat/
steam demand Without the co-production
principle, the waste energy would be dumped
into the local ecosystem as emissions and
wastes The working hypothesis of the paper is
to consider the potential of the CHP method to
serve as an anchor tenant of a local recycling
network or of an industrial ecosystem The
CHP method reduces the use of input energy
by 30–40% if compared with separate produc-tions of electricity and heat This also reduces emissions from the system, and naturally fuel use, which improves the economy and makes
it possible to use inhomogeneous fuels such as biomass, wood waste and fuels derived from refuse The use of these types of fuel cuts emissions further
In most of the industrialized world, the production of electricity takes place mainly in separate condensing plants (besides the three northern countries) In Table 1, the share of co-generation of the total national electricity production for EU and some European coun-tries is given in approximate figures for 1999 (see Cogen, 1997, 2000) The EU share is under 10% at the moment The EU target for increas-ing the application of CHP is defined as reach-ing the level of 12% in 2010
CHP IN AN INDUSTRIAL RECYCLING NETWORK
Studies conducted in Finland have indicated that significant reductions in fuel use and emission generation can be achieved with recy-cling networks that have been arranged into
CHP (Korhonen et al., 1999; Korhonen, 2000; Korhonen et al., 2001; Korhonen, 2001) In
Figure 1, the potential of a regional CHP power plant to act as the key activity in regional material and energy flow management is con-sidered The hypothesis here is that a region has a large and diverse industrial structure as well as a residential area with households, commercial and office buildings and services, which are located in close proximity to the industrial activity (within a few kilometres) The CHP plant of the core industry of the region can drive cleaner energy production in
Table 1 The 1999 share of co-generation of total na-tional electricity generation in some EU countries (ap-proximate figures, see Cogen, 1997, 2000)
40%
Netherlands:
2 For an overview on CHP application see Gustavsson (1994),
Verbruggen (1996), Grohnheit (1999).
Trang 4Figure 1 CHP-based energy production in an industrial recycling network.
the system by providing the system, i.e the
industries as well as the city and households,
with electricity The waste heat of electricity
generation is used for satisfying the industrial
process heat/steam demand throughout the
year and the demand for district heating (and
even cooling) in the city Additional use
op-portunities for waste heat could be found for
example in greenhouses or in local fish
farm-ing, to benefit from heating of the water (see
Ehrenfeld and Gertler, 1997) Further, if the
fuel is based on wood or forestry waste, the
nutrients embedded in the waste ash of the
CHP plant can serve as fertilizer in the local
forest ecosystem (Ranta et al., 1996; Korhonen
et al., 2001) It is also possible to develop the
utilization of the nutrients as fertilizer in
fields in agriculture or in local horticulture or
various gardening projects The output
sup-ply of the regional CHP plant is then a
rela-tively diverse as waste energy (heat) is used
as a product with value The use of imported
non-renewable stocks is reduced and also
re-gional fuel supply activities create new work-ing places
To consider the input side and the regional material and energy flow use of the system in Figure 1, one can note the technique of flu-idized bed burning and its ability to use the industrial wastes and REF from households as fuels This technique has become the main technology in Finnish energy systems When the technique is compared to a more tradi-tional pulverized coal burning, one finds the possibility to use relatively heterogeneous fu-els, such as biomass, or waste fuels In the presented hypothesis the largest regional in-dustry is a renewable resource based indus-try, e.g a forest industry In the system scenario, the use of the fluidized bed burning technique creates a situation in which the fuels are renewable flows of the local ecosys-tem or local renewable waste flows from in-dustry and from the city and households Peat reserves (see the discussion below) or local forest residues are used Local waste flows,
Trang 5e.g those derived from wood-based flows
such as wastes from saw-mills, pulp mills,
plywood mills and furniture mills or paper
and package waste originated and source
sep-arated household wastes are used to
substi-tute imported fossil coal and oil The ordinary
waste papers and a major part of packaging
waste are, however, recycled back to
papermaking
SOME CONDITIONS OF SUCCESS
OF CHP-BASED RECYCLING
NETWORKS
In theory, the CHP method with efficient
waste energy and waste fuel utilization would
seem to be a fruitful area of development for
environmental policy and industrial
environ-mental management to strive toward the
emission reduction targets However, the
share of co-generation from the national
elec-tricity generation is still quite small in most of
the industrial countries In the following parts
of the paper we try to identify some of the
main conditions of success of CHP-based
re-cycling networks Also, the barriers to the
wider application of this method as well as
the anchor tenant strategy based around it are
discussed Experiences arise from studies in
Finland
Renewable flow resources as fuels
The burning technique (fluidized bed
burn-ing) in the presented system scenario enables
the utilization of inhomogeneous fuels
Biomass and waste fuel use in one major
production plant of a regional network of
companies can contribute to the development
of a recycling network Industrial actors, but
also consumers and agriculture, can provide
side-products and wastes that can be used as
fuels in the CHP plant Sectors such as
forestry, the mechanical wood industry, pulp
and paper or the food industry can provide
many waste flows suitable for fuels There is
also biogas (methane, CH4) utilization from
landfills through pipelines leading into the
boilers or small-scale CHP units Municipal
and industrial wastewaters have been treated
in Finland with the aim of separating the solid particles from the water These are dried and manufactured into products that can be used
as fuels in energy production Wastewater-embedded methane (biogas) can be gathered and used in boilers for energy Further, given certain conditions, e.g adequate source sepa-ration, recycled fuels (REF) from households serve as fuels Similarly, if there exists local abundant renewable natural resources, these can substitute imported fossil fuels with the incineration technology
Biomass and waste fuels can also be gasi-fied with modern technology and the gas can
be fed e.g into a coal-fired boiler Therefore, some fraction of the coal can be replaced by renewable fuels Fossil natural gas can be used in a relatively efficient way in CHP It is possible to recover over 90% of the fuel en-ergy and more than 50% of it in the form of electricity, that is, when the plant has both gas turbine and steam turbine cycles
Co-production of district heat and electricity
From a strict environmental perspective, it would seem obvious that the global demand
of residential and city electricity and heat should be met with CHP applications In Fin-land, all of the major cities (though relatively small in terms of big cities in larger countries) are arranged into CHP for their district heat and electricity supply In most of the indus-trial world, the share of CHP is low and power is produced in plants, where the waste heat is released into the atmosphere or into local water systems
The usual precondition of co-production is that a relatively large heating demand exists and the demand is concentrated Most of the Central European countries, such as UK, Bel-gium, Germany, Switzerland, Austria, the Eastern European countries and a large part
of North America have such climatic condi-tions that district heating, heating of office buildings, commercial buildings, blocks of flats and raw-houses is required Heat can be transferred only over a relatively short dis-tance (10–20 kilometres) and hence the con-centration of the demand must exist in addition to the climatic conditions in order to
Trang 6establish CHP systems Such residential
con-centrations exist in all of the above-mentioned
countries, although there are also cities of low
population density e.g in North America
With the demand and when it is concentrated,
it is economic to construct district heating
networks Here heat, i.e in the CHP method
waste energy from the electricity production,
is transferred with pipelines and it can be
used for heating room space, hot water and
for cooling room space
Co-production of industrial heat/steam and
electricity
There is a demand practically everywhere in
the industrialized world for industrial energy
that can be supplied from CHP For instance,
industries such as chemical and wood
pro-cessing require large amounts of heat/steam
or process heat Here the demand extends
beyond the cold part of the year In industrial
processes, the demand for heat is normally
the same throughout the year
If the waste heat formed during electricity
generation can be used for district heat, but
also for industrial heat/steam requirements of
local heavy industrial actors, the emergence of
a system that uses waste fuels and produces
products, but also waste-derived products for
the many actors in the local system seems to
be possible The integration of heavy
indus-trial systems and end consumption systems
such as residential areas of a city is important
for environmental management Often the
main problems of environmental management
result from the separation of production and
consumption, which makes the life cycle of
products difficult to monitor and control and
energy consumption is increased (Anderberg,
1998)
There are some cities in Finland that buy
their district heat from the local forest
indus-try system CHP plant and hence benefit from
its waste energy There are also problems in
these kinds of scenarios The distance must be
less than 20 kilometres and the forest industry
must increase its energy efficiency to be able
to sell the heat outside In addition, different
ownership structures between city
district-heating distributors and power plants of
forest industry can prevent co-operation However, in theory, the goal should be fur-ther pursued, because fur-there are 11 forest in-dustry systems in Finland (‘forest inin-dustry integrates’), many of which are located near a residential concentration and its energy sup-ply system Both of these systems are usually arranged into CHP
If the production of district heat and elec-tricity can be connected to the production of industrial steam, the fuel efficiency of a CHP plant can reach 85% This means that 85% of the energy that is embedded in the fuels can
be used and only 15% will be released into environment, e.g in the form of water fluxes
to the local river or lake ecosystem (Korhonen
et al., 1999; City of Joensuu, 2000) In a normal
power plant, in which only electricity is pro-duced, the efficiency is approximately 40– 45%
Public ownership
In Finland, many of the power plants are owned by the regional public energy com-pany in charge of the distribution of heat and electricity Arguably, the monopoly situation has made it easier for the energy companies
to make investments in CHP, which is very capital intensive and has long payback times
(Korhonen et al., 1999) Similarly, a publicly
owned company somewhat differs from a company involved in a normal competitive situation of the markets Elements that are often identified as barriers of environmental networks such as trust or inability to cooper-ate may be less difficult for publicly owned companies Arguably, a publicly owned com-pany can stimulate cooperation in waste utilization between private firms, which otherwise would not be willing to cooperate with their ‘potential’ competitors within the regional system
Long-term support system for IE
A CHP plant can stay in operation for decades This factor can be seen both as an opportunity for industrial ecosystem and as a barrier for such projects Industrial systems with many different actors are very diverse
Trang 7and complex systems The diversity of
con-flicting interests or the diversity of technical
requirements for using different waste flows
implies that the development of an industrial
ecosystem-type cooperation demands a lot of
time A CHP plant could provide a waste
utilization anchor tenant that serves as a
long-term support system around which material
and energy flow networks are gradually
established
On the other hand, the long operation time
might hinder innovation in green technology
Local actors might resist the adaptation of
new cleaner production technologies, because
they have invested heavily in CHP and wait
for paybacks that occur after relatively long
time periods This might lead to unhealthy
dependencies For example, some companies
can neglect innovation in their own waste and
emission management, because some amount
of the wastes can be sold to the existing CHP
plant in close proximity
Local conditions
The system development around CHP similar
to the scenario in Figure 1 has been possible
in a country such as Finland, which has large
renewable natural resource reserves and low
population density The imported fossil fuels
can be substituted with local renewables
through sustainable extraction of the
re-sources In Finland, the annual cuttings of the
forest are lower than the annual growth The
forest ecosystem is able to bind more of
car-bon in a CO2form than the amount of carbon
that is annually released through cuttings and
natural drainage (Kauppi et al., 1992) Peat has
been defined as a slowly renewable resource
in Finland, because its use rate is below the
annual growth One-third of the land area in
the country is covered by peatlands
(Lap-palainen and Ha¨nninen, 1993; Savolainen et
al., 1994; Selin, 1999) The Finnish context,
then, is relatively rare and the development of
industrial ecology-type material and energy
flow structures will be more difficult in
coun-tries with fewer resources and more
inhabitants
Also other local conditions have made
the situation suitable for the development of
recycling networks around CHP in Finland In
a cold country, there exists demand for dis-trict heating There are also lots of energy intensive industries in Finland, e.g forest in-dustry, which require electricity and process heat/steam In addition, the prizes and costs
of resources and fuels have contributed to the efforts in waste energy and waste fuel utiliza-tion The price of round wood was reflected
in the markets and the industry has reduced its cuttings under the level of sustainable yield and established material cycles and en-ergy cascades Correspondingly, the costs of the imported fuels such as coal and oil have stimulated CHP application, which reduces the amount of fuels used and can benefit from local waste-derived fuels
BARRIERS OF CHP SYSTEMS
Economic barriers
Although the demand for heat would exist, the CHP might not be economic This is be-cause investment in CHP means that power purchased and heat produced otherwise are substituted with on-site fuels and, if the price
of electricity is low, e.g due to inexpensive hydropower or due to subsidized production
of condensing power plants through subsi-dized coal, CHP might not be economic (Gus-tavsson, 1994) As noted above, CHP is also capital intensive and the profits or the pay-backs arise only after relatively long time periods For fast profit seeking private enter-prises, this can reduce the motivation to en-gage into the application of the CHP method Economic barriers can obviously arise with issues discussed above such as fuel prizes, waste utilization technology, innovation and ownership factors
Regulation and policy
One can assume that the CHP method will be incorporated increasingly often to EU and na-tional policy and legislation, because the EU average of the application of the method is much lower than the potential Arguably, the low share of CHP can to some extent be
Trang 8traced to policy measures that have not made
the conditions suitable for investments into
the method At present, for example, the
li-censing and regulatory activities may be
planned in accordance with the preferences of
large electricity companies They can set such
terms for electricity grid connections that
ap-plying CHP will be difficult Two general
types of policy direction for facilitating CHP
can be identified
First, requirements for centralized heat
planning can enhance the combination of the
production of heat and electricity Experiences
from Denmark support this argument
(Grohn-heit, 1999) With these arrangements
co-gener-ation plants have the potential to supply heat
for district heating networks, which are
owned and operated by municipal or local
energy utilities Second, the liberalization of
electricity production and the access to
na-tional electricity grid could be a policy option
Here fair competition conditions for local
CHP operators in small district heating
net-works or in industry are guaranteed In such
a situation, the CHP plants could, for
in-stance, sell surplus power over the national
grid and buy back-up power when needed
Second, requirements to reduce CO2
emis-sions and the use of fossil fuels to mitigate the
greenhouse effect, both in global and national
scale, will obviously contribute to the
motiva-tion to develop policies that enable cleaner
production strategies such as CHP Practical
policy instruments to guide the energy
com-panies towards improved energy efficiency,
and CHP, can be, e.g., voluntary agreements
on improvements, taxation of fuel use or
emissions, cap and trade policies or
regula-tions and licensing
The approach to the taxation of fossil fuels
that has been taken in the northern countries
of Sweden, Denmark and Finland can be
ar-gued to have been successful in facilitating
the type of activity and arrangement that
would follow some of the aims in CHP-based
recycling networks (see Ring, 1997) With
taxes, the industry has been encouraged to
develop toward natural cycles, to adopt its
activity to the reproduction capacity of
ecosystems, i.e to reduce the non-renewables
that are used, and use wastes as well as
renewable natural resources Fossil fuel taxes also enhance the regional arrangement of in-dustrial activity, because transportation is based on fossil oil The road transportation fuels already have high taxes in the Nordic and EU countries This is mainly due to fiscal factors
Large unit sizes
In countries where there exists low popula-tion density, until now, CHP plants, which have required large unit sizes and concen-trated demand, have been constructed mostly for larger cities The future development of CHP technology also has the potential to move toward smaller unit sizes in CHP plants This enables the gradual enlargement
of heat and steam distribution networks and shortens the payback times of the invest-ments A separate CHP plant can even be constructed for hospitals, shopping malls, of-fice building blocks etc This could also make the task of using waste fuels easier, the trans-portation costs of which to larger and more distant plants have been one of the limiting factors of waste fuel utilization in energy pro-duction In Finland, much of the forest indus-try activity has been arranged into local systems (‘integrates’), many of which are lo-cated near cities, but in addition, in the vast sector many production units of integrated saw mills, pulp mills and paper mills exist that are located far from cities The further use of the waste fuels from these could be possible in the heating of households nearby provided that CHP networks are established
to these small household concentrations
Awareness
The barriers to CHP also include barriers re-lated to information and know-how These seem to be perhaps the biggest barriers to CHP As noted above, climatic conditions and demand for district heat as well for industrial steam exist everywhere in the industrial world, but the wider application of the method, besides these three countries, is yet
to occur Similarly, the method would seem to provide a useful opportunity for the effort to
Trang 9strive toward the international emissions
targets, but is still somewhat neglected in
much of the environmental planning and
de-cision-making processes The co-generation
method may not be familiar to the
organiza-tions that might benefit from it Also CHP can
be understood as being outside of the
busi-ness area of electricity companies They might
see themselves as providing only electricity,
not heat
CONCLUSION
The CHP method offers a practical example of
technology around which it has been and,
given certain conditions, will be possible to
develop recycling networks or industrial
ecosystem-type structures The potential in a
system, the actors of which use each other’s
waste material and residual energy in
co-operation, is obvious for environmental
man-agement In theory, this can reduce the risks
involved in somewhat isolated approaches
that focus solely on an isolated product,
sub-stance or waste stream or on an individual
process In this way, the tendency toward
problem displacement, e.g shifting the wastes
from one part of the industrial system to some
other part of the system, could also be
reduced
Our purpose has merely been to identify
some of the potential embedded in the
philos-ophy of CHP plants as anchor tenants of local
recycling networks and discuss some of the
barriers involved Industrial ecosystem theory
as well as its application in local recycling
networks or eco-industrial parks is still in its
infancy and the identification of some
univer-sal management or design principles seems
rather obsolete with the current amount of
documented empirical material The already
existing approaches, techniques or tools of
corporate environmental management as well
as the different environmental policy
instru-ments need to be used
A local recycling network that includes a
diversity of actors that use each other’s wastes
in cooperation could be taken as a vision
towards which one could strive with material
flow models, life cycle assessment or
environ-mental management systems Correspond-ingly, environmental taxes, direct regulation
or cap and trade policies can give incentives for developing practical IE applications CHP-based waste utilization, in both production and end-consumption systems, seems to be a suitable testing ground for industrial ecosys-tem theory building alongside comparative case studies
REFERENCES
Anderberg S 1998 Industrial metabolism and the link-ages between economics, ethics and the environment.
Ecological Economics 24: 312–317.
Ayres RU, Ayres LU 1996 Industrial Ecology – Towards
Closing the Materials Cycle Elgar: Cheltenham.
Baas L 1998 Cleaner production and industrial
ecosys-tems, a Dutch experience Journal of Cleaner Production
6: 189–197.
Baccini P, Daxbeck H, Glenck E, Henseler G 1993.
Metapolis : Gueterumsatz und stoffwechselprozesse in den
privathasuhalten einer stadt, Report 34a National
Re-search Program City and Transport: Zurich.
Boons FAA, Baas L 1997 Types of industrial ecology:
the problem of coordination Journal of Cleaner
Produc-tion 5(1/2): 79–86.
Brand E, de Bruijn TJNM 1999 Shared responsibility at the regional level: the building of sustainable
indus-trial estates Journal of European Environment 9: 221–
231.
Brunner P, Daxbeck H, Baccini P 1994 Industrial metabolism at the regional and local level: a
case-study on a Swiss region In Industrial Metabolism,
Ayres RU, Simonis UE (eds) United Nations Univer-sity Press: Tokyo; 163–193.
Burstro¨m F 1999a On the management of nitrogen flows: towards a decentralisation of environmental
management in Sweden? Vatten – the Swedish Journal
of Water Management and Research 55(4): 267–278.
Burstro¨m F 1999b Materials accounting and
environ-mental management in municipalities Journal of
Envi-ronmental Policy Assessment and Management 1(3):
297–327.
Burstro¨m F, Korhonen J 2001 Municipalities and indus-trial ecology: reconsidering municipal environmental
management Sustainable Development 9(1): 36–46 (has
also appeared in Burstro¨m F 2000 Environment and
Municipalities – Towards a Theory on Municipal Envi-ronmental Management Royal Institute of Technology
Division of Industrial Ecology; 255–267).
Chertow M 1998 Eco-industrial park model
reconsid-ered Industrial Ecology 2(3): 8–10.
City of Joensuu (Paavo Ristola Engineering) 2000
Envi-ronmental Impact Assessment of the Scenarios on Sirkkala Industrial District Joensuu.
co-financed by the SAVE Programme of the European Commission Cogen Europe: Brussels; 182 pp.
Trang 10Cogen (Dr Simon Minett, Director, Cogen Europe) 2000.
Unlocking the full potential for co-generation Clean
Energy 2000 World Conference and Exhibition, 2000.
Cote P, Cohen-Rosenthal E 1998 Designing
eco-indus-trial parks: a synthesis of some experience Journal of
Cleaner Production 6: 181–188.
Ehrenfeld J, Gertler N 1997 The evolution of
interde-pendence at Kalundborg Industrial Ecology 1(1): 67–
80.
Frosch D, Gallopoulos N 1989 Strategies for
manufac-turing Scientific American 261(3): 94.
Graedel T, Allenby B 1995 Industrial Ecology
Prentice-Hall: Englewood Cliffs, NJ.
Grohnheit PE 1999 Energy Policy Responses to the Climate
Change Challenge : the Consistency of European CHP,
Renewables and Energy Efficiency Policies, Risoe-R-1147
(EN) Risoe National Laboratory; 148 pp.
Gustavsson L 1994 District-Heating Systems and Local
Energy Strategies, Doctoral Dissertation University of
Lund.
Hayes C, Scho¨pp W, Amman, Bertok I, Cofalg J, Gyarfas
F, Klimont Z, Makowski M, Shibayev S 1997
Simulta-neous Optimization of Abatement Strategies for
Ground-Level Ozone and Acidification, IIASA Report IR-97-090,
81 pp.
Kauppi PE, Mielika¨inen K, Kuusela K 1992 Biomass
and the carbon budget of the European forests Science
256: 70–74.
Korhonen J 2000 Industrial Ecosystem: Using the Material
and Energy Flow Model of an Ecosystem in an Industrial
System, Jyva¨skyla¨ Studies in Business and Economics
5, Doctoral Dissertation University of Jyva¨skyla¨, 131
pp.
Korhonen J 2001 Some suggestions for regional
indus-trial ecosystems Journal of Eco-Management and
Audit-ing 8(1): 57–69.
Korhonen J, Wihersaari M, Savolainen I 1999 Industrial
ecology of a regional energy supply system – the case
of Jyva¨skyla¨ Region Journal of Greener Management
International 26: 57–67.
Korhonen J, Wihersaari M, Savolainen I 2001 Industrial
ecosystem in the forest industry of Finland: Using the
material and energy flow model of a forest ecosystem
in a forest industry system Ecological Economics
September/October 2001, in press.
Lappalainen E, Ha¨nninen P 1993 The Peat Reserves of
Finland, report of Investigation 117 Geological Survey
of Finland: Espoo; 118 pp+11 pp app (in Finnish).
Lehtila¨ A, Savolainen I, Tuhkanen S 1997 Indicators of
CO2Emissions and Energy Efficiency : Comparison of
Fin-land with Other Countries VTT, Technical Research
Centre of Finland: Espoo; 14–18.
Linden HR 1994 Energy and industrial ecology In The
Greening of Industrial Ecosystems, Allenby BR, Richards
DJ (eds) National Academy Press: Washington, DC.
Linnanen L 1998 Essays on Environmental Value Chain
Management – Challenge of Sustainable Development.
University of Jyva¨skyla¨ School of Business and Economics.
Lowe EA 1997 Creating by-product resource
ex-changes: strategies for eco-industrial parks Journal of
Cleaner Production 5(1/2): 57–66.
Ranta J, Isa¨nna¨inen S, Wihersaari M 1996 Recycling of ash in extensive utilisation of biomass Biomass for
European Bioenergy Conference Commission of the Eu-ropean Communities Volume 1 Pergamon, Oxford; 706–711.
Ring I 1997 Evolutionary strategies in environmental
policy Ecological Economics 23(3): 237–250.
Savolainen I, Hillebrand K, Nousiainen I, Sinisalo J.
1994 Greenhouse Impacts of the Use of Peat and Wood for
Energy, VTT Research Notes 1559 Technical Research
Centre of Finland: Espoo; 65 pp+9 pp app.
Selin P 1999 Industrial Use of Peatlands and the Re-Use of
Cut-Away Areas in Finland, Jyva¨skyla¨ Studies in
Bio-logical and Environmental Science No 79 239 pp, our own translation (originally in Finnish).
Sirkin T, ten Houten M 1994 The cascade chain – a theory and tool for achieving resource sustainability
with applications for product design Resources,
Con-servation and Recycling 10: 213–277.
Verbruggen A 1996 An introduction to CHP issues.
International Journal of Global Energy Issues 8(4): 301–
318.
Wallner HP 1999 Towards sustainable development of industry: networking, complexity and eco-clusters.
Journal of Cleaner Production 7(1): 49–58.
BIOGRAPHY
Dr Jouni Korhonen holds a PhD in Business Studies He is currently working as an Assis-tant Professor of Business Economics at the University of Joensuu, and can be contacted at the Department of Economics, University of Joensuu, PO Box 111, 80101 Joensuu, Finland E-mail: jouni.korhonen@joensuu.fi
Ilkka Savolainen is a Research Professor at VTT Energy of the Technical Research Centre
of Finland He is also a Docent at the Depart-ment of Forest Products Technology of the Helsinki University of Technology, Espoo, Finland