By Abitha.R,

Research Scholar,Indian Institute of Science

Bangalore.

Conducted under the guidance of Dr.R.Sharada,

Scientist,Central Food Technological Research Institute,

Mysore. 1

Contents

Introduction1

Objective of the Study2

Methodologies3

Results and Conclusion4

2

3

4

I) Need13 TW/year today26 TW/year by 205039 TW/year by 2100

II) Resources (C neutral)1) Fossil Fuel/Carbon Capture

-25 billion metric tons of CO2/year-Volume of Lake Superior

2) Nuclear-10 TW/year requires 1 new GW fission plant every day for 50 years-Terrestrial uranium would be exhausted in 10 years-Fusion – no sooner than 2040

3) Renewable-Hydroelectric 0.5 TW maximum (UN

estimates)-Tides and oceans <2 TW/year maximum-Geothermal 12 TW/year (but only

fraction extractable)-Wind 2-4 TW/year maximum-Sun 120,000 TW/year (biomass + electricity

<2% today)

More energy from the sun strikes the earth in 1

hour than all of the energy currently

consumed on the planet in 1 year!

Source : Basic Research Needs for Solar Energy Utilization Report of the Basic Energy Sciences Workshop on Solar Energy Utilization, April 18-21, 2005, DOE

5

Third Generation Renewable Fuels

Source : Basic Research Needs for Solar Energy Utilization Report of the Basic Energy Sciences Workshop on Solar Energy Utilization, April 18-21, 2005, DOE

6

Carbon dioxide Mitigation

Energy from

Waste

Using B.braunii

7

Easily available

Easy to culture and grow

Limited area required

Fallow land can be used

Hydrocarbon production

8

Botryococcus braunii was isolated from the fresh water ponds in Mamallapuram, Tamil Nadu, India, and was maintained in modified Chu13 media.

9

Experiments – An Overview

10

11

•The spent wash was collected from Mandya Sugar Factory, Mandya (in Jan 2009)

•The Dairy Waste was collected from Mysore- Chamarajnagar Dist. Corporation, Milk Producer’s Society Union Ltd ( Nandini milk processing industry, Mysore) (in Jan 2009)

12

Before Treatment After Treatment 13

Culture Conditions

•Control

• 0.5%

• 1%

• 2%

• 3%

• Control• Media sugar and dairy waste • Concentrated sugar and dairy waste• Dilute Sugar and Dairy waste• Centrifuged Sugar waste

•4

•4.5

•5

•5.5

•6

Wastewater CO2 pH

14

•6.5

•7

•7.5

•8

•8.5

15

16

Retained and Observed for 30 days

17

Collection of samples after every three days

Tests conducted:1.Biomass test (Lichtenthaler (1987))

2.Carbohydrates Test (By Phenol-Sulphuric acid method(Dubois et al., 1956))

3.Protein Test (By Lowry’s Method (Lowry et al., 1951) )

4.Chlorophyll Test (Davies (1976)) 18

19

Initial and Final CODs were estimated20

Harvesting and Lipid Extraction

21

22

Growth of Algae in Spent Wash and Dairy Wastewater

• Centrifuged concentrated sugar waste has the highest cell density of 0.97g/L

• The Media sugar waste has the second highest cell density of 0.7915 g/L 23

0

0.2

0.4

0.6

0.8

1

1.2

0 3 9 12 15 18 21 24

No. of Days

Bio

ma

ss

in g

/L

control

mdw

ddw

cdw

ccdw

msw

dsw

csw

ccsw

0

10

20

30

40

50

60

70

Samples

Per

cent

age

of L

ipid

s

Influence of the culture with different concentrations of wastewater on lipid production

• The percentage of lipid is highest (65.56%) in control

•Dairy waste has shown a considerable amount of lipid production (about 58.2%) 24

0200400600800

1000120014001600

Dairy

wast

ewat

er(In

itial

)Sp

ent w

ash

(Initi

al)

Cont

rol

med

ium

(Fin

al)

Dilu

te s

ugar

wast

e (1

:1)

(Fin

al)

Dilu

te s

ugar

wast

e (2

:1)

(Fin

al)

Med

ia s

ugar

wast

e (F

inal

)Co

ncen

trate

ddi

ary

wast

e(F

inal

)Di

lute

dia

rywa

ste

(Fin

al)

Med

ia d

iary

wast

e (F

inal

)

COD

valu

es in

mg/

L

Initial and Final COD values of the Wastewater before and after Treatment

 

• COD has reduced from 1185 mg/L to an average of 20 mg/L in Dairy waste

• There is a considerable amount of reduction of COD from 1560 mg/L to an average of 650 mg/L in spent wash 25

Growth of Algae in Different Partial Pressures of CO2

• The biomass density is observed to be the highest in control

• 3% Carbon-dioxide has the second highest biomass density (about 2.56 mg/L)

26

00.5

11.5

2

2.53

3.54

4.5

0 3 6 12 18 21 24 27 30

Number of days

To

tal C

hlo

rop

hyl

l in

mg

/LControl

0.50%

1%

2%

3%

Influence of the culture with different partial pressures of CO2 on lipid production

• 2% CO2 has lead to the maximum lipid production (58%) when compared to control (62%).

27

0

10

20

30

40

50

60

70

Control 0.5% (v/v) 1% (v/v) 2% (v/v) 3% (v/v)

Lipi

ds in

per

cent

age

Influence of the culture with pH on the lipid production

• pH of 5.5 and 8 are seen to be optimum pH for the maximum lipid production

28

05

101520253035404550

pH 4 pH 4.5 pH 5 pH 5.5 pH 6.0 pH 6.5 pH 7 pH 7.5 pH 8 pH 8.5

Lipi

d in

Per

cent

age

•The final pH of all the samples after 30 days was found to be 6.3 – 7.2 after the inoculation period

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• The sugar industries and dairy industries discharge their wastewater directly in the river and municipal sewers respectively. The usage of the wastewater for the production of hydrocarbon can open up new opportunities of generating energy from waste.

• The growth of algae has proved to improve with the increase in the partial pressure of CO2 on the culture media which shows that the algae has high CO2 mitigation capacity. Converting a 100-MW thermal power plant from using coal to using liquid fuel derived from B.braunii can reduce CO2

emissions by 1.5 X 105 tons/yr (Sawayama et al., 1999).

• The algae has , further, been able to grow in various pH and has successfully neutralized a wide range of pH.

30

Source: http://www.freewebs.com/renata17/Biodiesel%20oil.JPG

CO2

Was

tewat

er

Biofuel

32

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