Spent coffee grounds as a versatile source of green energy

Spent Coffee Grounds as a Versatile Source of Green Energy Spent Coffee Grounds as a Versatile Source of Green Energy Scientific Seminar Le Ngoc Hoang Anh Hanoi, 05th Octorbor 2020 01 INTRODUCTION 02 MATERIALS AND METHODS 03 RESULTS AND DISCUSSION 04 CONCLUSION 2 OUTLINE 3 Biodiesel is a good alternative for fossil fuel INTRODUCTION However, biodiesel is more expensive than fossil fuels 4 INTRODUCTION Coffee powder Beverage Brewed Coffee powder waste Extraction with hexaneether Triglycerides So.

Spent Coffee  Grounds  as a

Scientific Seminar

Le Ngoc Hoang Anh

1 INTRODUCTIO N 0

2 MATERIALS AND METHODS 0

3 RESULTS AND DISCUSSION 0

4 CONCLUSION

2

OUTLINE

Biodiesel is a good alternative for fossil fuel

INTRODUCTION

However, biodiesel is more expensive than fossil fuels

However, biodiesel is more expensive than fossil fuels

INTRODUCTION

Coffee powder Beverage Brewed

Coffee powder waste

Extraction with hexane/ether

Triglycerides Solid waste

Glycerin

Biodiesel Ethanol Fuel pellets

Figure 1 Schematic representation of the biodiesel production process from spent coffee grounds The other value-added products such as H2, ethanol, and fuel pellets can also be achieved from this waste feedstock

MATERIALS AND METHODS

Oil Extraction

6

MATERIALS AND METHODS

Refluxed (Buckner funnel) Filtered (rotary evaporator) Separated

characterized & quantified

(HPLC) Separated

FFAs

Transesterification Process

MATERIALS AND METHODS

8

MATERIALS AND METHODS

The yield and composition of the biodiesel were

investigated using HPLC (High performance liquid

chromatography)

RESULTS AND DISCUSSION

A small amount of FFA, monoglycerides (MG), and diglycerides (DG) was also observed

in the oil

RESULTS AND DISCUSSION

Source Amount (million

gallons/year)

Advantage Disadvantage

Tallow, brown

grease, pork fat

(white grease),

lard, fish oil,

poultry fat

Animal fat oxidative stability, less expensive

High sulfur content, high FFA (50%-90%) bad odor, bad cold flow

properties, high cloud point, high pour point, transportation costs, purification required

Used vegetable

oil

Vegetable oil less expensive, readily available

Bad ofor, high FFA

Coffee oil 2.92 Less expensive, higher

stability, well-established transportation, pleasant smell

Extraction of oil from spent coffee grounds required

Source Amount (million

gallons/year)

Advantage Disadvantage

Tallow, brown

grease, pork fat

(white grease),

lard, fish oil,

poultry fat

Animal fat oxidative stability, less expensive

High sulfur content, high FFA (50%-90%) bad odor, bad cold flow

properties, high cloud point, high pour point, transportation costs, purification required

Used vegetable

oil Vegetable oil less expensive, readily available Bad ofor, high FFA

Coffee oil 2.92 Less expensive, higher

stability, well-established transportation, pleasant smell

Extraction of oil from spent coffee grounds required

Table 1 Comparison of Coffee Oil with Other Waste Feedstock for Biodiesel Production

The quality of the coffee oil as feedstock for biodiesel production was a better quality and cost-effective

as compared to other waste sources available to date

RESULTS AND DISCUSSION

GC-MS analysis showed the presence

of C18-C16 methyl esters of fatty acids, where more than 99% of the total

composition was methyl esters of palmitic acid (51.4%), linoleic acid (40.3%), and stearic acid (8.3%)

RESULTS AND DISCUSSION

Table 2 ASTM Results for the Coffee Biodiesel

The analysis of the results shows that biodiesel obtained from spent coffee grounds is a strong candidate

as an alternative to diesel

RESULTS AND DISCUSSION

 Coffee grounds could still be used as compost

for the garden and/or as fuel pellets

 A profit of more than $8 million/year, if both biodiesel and pellets can be marketed

CONCLUSION

- ≈ 15% of the oil obtained from spent coffee grounds was converted to biodiesel with 100% yield

- Spent coffee grounds can be used as a potential source to produce quality biodiesel and fuel pellets, this biodiesel can be used industrially as an alternative to diesel

Spent coffee ground

THANK YOU!

ANY QUESTION?