Understanding Biogas Ver 1.1

BiogasgEN

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302 /A 1 Bhimashankar,Sector 19-A Nerul,Navi Mumbai 400706 ..

Maharashtra. INDIAC

Centre for application Of renewable energy

EMAIL : [email protected] Page : www.careindia.co.nr

Home pages:/ : http://www.careindia.co.nr : http://www.reindia.co.nr : http://www.biogas.co.nr email : [email protected] : Skype : care.india Mob : +9122-8097119058 / +9122-8097127783

Centre for application Of renewable energy

objectives of incorporationobjectives of incorporation

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Research and development of

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renewable fuel Electricity generation from biogas

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Electricity generation from biogasLiaison for carbon creditsNon conventional energy

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the mantra and philosophy

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humans tend to make the process li t d ibl b

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l h b l C complex machines but a simple approach is still possible


clean environmentclean environment

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CLEAN ENVIRONMENT FOR ALL, INCLUDING NATURE ITSELF". It is said that nature has suffered more because of man rather than other

way round. Wherever there is a human interference the environment has C yundergone considerable degradation.


ALARM BELLS FOR THE HUMAN RACE …… So what should we do about it?

Th li ti h t l b t it i b tt l t th Si

So what should we do about it?

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The realisation has come at a slower pace but it is better late than never. Sincenothing new can be created in this world and while existing energy sources aregetting depleted at alarmingly rapid rate We must use every available resourcejudiciously.

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Science (BIOTECHNOLOGY) …..HELP IS ON THE WAY

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GY Humans tend to make the process as complicated as possible by trying toimprove on nature in complex machines but a simple approach is still possible

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There are enough natural agencies, which are too keen to help us in thisendeavor. Science has revealed these tools and we must use their potential to

hi th g t ll f t

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What is so special of these micro-organisms?

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One such resource is the waste organic matter that is generatedin the kitchens and one of the natural agencies which will play animportant role in this utilisation is the tiny part of the huge worldof tiny microbes What is so special of these microorganisms?

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1 They can thrive in extreme environments where ordinarily no one would even imagine that there would be life..

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2 The discovery of extremophiles has put a new life into the biotech industry and dreams

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of stock options in the minds of field biologists.

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3 These organisms not only survive higher temperatures but also grow and reproduce.They have the ability to use sulphurous waste and convert it into non-toxic products.



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It i id l t th g i t d g d th kit h t tC It is ideal to use these organisms to degrade the kitchen waste to removemore toxic elements and subject it to the biogas plant for methanegeneration.


The Management of Organic Waste

Based on our understanding of thermophilic microorganisms in particular and

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Based on our understanding of thermophilic microorganisms in particular andmicrobial processes in general, there are two important modifications made in theconventional design of the biogas plant

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Drawbacks GOBAR GAS ???

A G b l t b d lid t h k th l t Thi

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A Gobar gas plant based on solid waste chokes the plant. Thischoking occurs due to thick biomass that is inaccessible to themicroorganisms to digest it. 'The logical solution is to conversion ofthe solid waste into slurry that is far more accessible for the

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microbial action. Convert the solid waste into slurry achieves thispurpose. These two modifications have improved the design of thetraditional biogas plant

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Drawbacks of GOBAR GAS ???

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However, the use of cattle dung as the feedstock is

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, gthe main factor limiting widespread use of methaneas household fuel in rural India. Current domesticbiogas plants require about 40kg of cattle dung

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(from 6 to 8 heads of cattle) every day. And becausethe dung has a retention period of about 40 days,the size of the biogas plant is also large.

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"Restriction of space, money and absence ofsufficient animals prevent many aspirants fromhaving a biogas plant


Reasons for Failure

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Operators did not have the skills or the timerequired to keep a marginal system operating.Producers selected digester systems that were not

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compatible with their manure handling methods.Some designer/builders sold “cookie cutter”

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gdesigns to farms. For example, of the 30 plug flowdigesters built, 19 were built by one designer and 90percent failed.

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Reasons for Failure

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GY The systems became too expensive to maintain and

repair because of poor system design

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Farmers did not receive adequate training and

technical support for their systems

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There were no financial returns of the system or

returns diminished over time

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Farms went out of business due to non-digester

factorsC factors.


Reasons for SUCCESS

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The owner/operator realized the benefits biogastechnology had to offer and wanted to make it work.

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The owner/operator had some mechanicalknowledge and ability and had access to technicalsupport.

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ppThe designer/builder built systems that werecompatible with farm operation.The owner/operator increased the profitability of

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f th l f l t i it d thC revenues from the sale of electricity and othermanure byproducts than from the sale of milk.


Today’s Experiences

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The development of anaerobic digesters for

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livestock manure treatment and energyproduction has accelerated at a very face

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influencing this market demand include:increased technical reliability of anaerobic

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Today’s Experience

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GY There is an increasing number of states and

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CENTRAL programs designed to cost share in thedevelopment of these systems; and the emergenceof new state

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A new growing concern of farm owners about

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environmental quality.

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Management Organic Waste

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The waste generated in kitchen in the form of vegetable refuse, stale cookedand uncooked food, extracted tea powder, waste milk and milk products canall be processed.


all be processed.

Waste to Kitchen

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The efficient disposal of kitchen waste is ecofriendly as well as costeffective. One has to consider more than monetary aspects. Thed i f k d f d i d l d t l tiC dumping of uncooked food in unmanned area leads to populationgrowth of nuisance animals. It is undoubtedly unhygienic and posesa threat to the habitat.


Waste to Kitchen

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These factors add to the value of such plants. we can certainlyhandle the kitchen waste and other biodegradable BIOMASSwaste like paper, ETC…….


waste like paper, ETC…….

What is Biogas ??

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Wh t i bi Wh t i it’ iti ?

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COMPOSITION OF BIOGAS

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CH3COOHAcetic acid --> CH4

Methane + CO2Carbon dioxideC Acetic acid Methane Carbon dioxide

2CH3CH2OHEthanol + CO2

Carbon dioxide --> CH4Methane + 2CH3COOH

Acetic acid

CO2C b di id + 4H2

H d --> CH4M h + 2H2O

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Carbon dioxide Hydrogen Methane Water

COMPOSITION OF BIOGAS

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Composition of biogas

Substances Symbol Percentage

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Methane CH4 50 - 70

Carbon Dioxide CO2 30 - 40

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Nitrogen N2 1 - 2

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Water vapour H2O 0.3

Hydrogen Sulphide H2S Traces

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C/N RATIO MATERIALS

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Raw Materials C/N Ratio

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Duck dung 8 Human excreta 8 Chicken dung 10 Goat dung 12 Pig dung 18 Sheep dung 19

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Cow dung 24 Buffalo dung 24 Water hyacinth 25 Elephant dung 43

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Straw (maize) 60 Straw (rice) 70 Straw (wheat) 90 Saw dust >200

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Commonly used fuels Calorific valuesin Kilo calories and Thermal efficiencyy

Commonly Calorific Th l

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Commonly used fuels

Calorific Thermal efficiency

Bio-gas 4713/M 360%

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Dung cake 2093/Kg 11%

Firewood 4978/Kg 17 3%

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Diesel (HSD) 4600/Kg 30%

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Kerosene 10850/Kg 50%

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Petrol 11100/Kg ---


BIOGAS PLANTSEN

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We at CARE provide a realistic screening process for livestock facilities to decide if

biogas technology is an C biogas technology is an appropriate match for the farm and farm owner. From the vast

array of Plants and designs


CLASSIFICATION OF BIOGAS PLANTSBASED ON THE PLANT COMPONENTS

Bio gas Plants with Movable Fixed Dome Type Digester and gas holder Flexible Bag Plant

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Sr.Bio-gas Plants with Movable

Gas holder Fixed Dome Type Digester and gas holder

SeparateFlexible Bag Plant

No. Plant Models

i KVIC Design Sichuan Model Sulabh Model Neuprene Bag Model

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ii IARI Design Shanghai Model Bardoli Model Swasrik Biogas Plant

iii PRAI design (Two Chambers) Janta (Brick Mesonry) PAU Model Red Mud Plastic Model

iv Kamdhanu (baked clay) model Bhagya Laxmi Sangli Model

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v ASTRA Model Kalinga (RCC) CV Krishna Model (FRP Fixed Dome)

vi JWALA Model ASTRA (Chinese type)

ii G h M d l GAIC/ATRC (RCC g t)

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viii Khira model AFPRO (Horizontal RCC pipe )

ix FRP Model Deen Bandhu Model

x Ferro cement Digester Model Bharat ModelC x Ferro cement Digester Model Bharat Model

xi SERC Model

xii SPRERI Model


THE BIODIGESTER : KVIC

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Floating drum digester Experiment onbiogas technology in India began in1937. In 1956, Jashu Bhai J Pateldeveloped a design of floating drum

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biogas plant popularly known as GobarGas plant. In 1962, Patel's design wasapproved by the Khadi and VillageI d t i C i i (KVIC) f I di

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and this design soon became popularin India and the world. In this design,the digester chamber is made of brick

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C digester. Thus, there are two separatestructures for gas production andcollection..

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THE BIODIGESTER : DCS

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DCS uses a taper design for high water

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THE BIODIGESTER : DCS

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DCS uses a straight design for low water table areas

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THE BIODIGESTER : JANTA

Janata designs are relatively easy to

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construct and maintain because they have nomoving parts and because corrosion is not aproblem. One drawback is that Janata plantsmay require periodic cleaning due to scumbuild-up. As gas pressure increases in a fixed

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volume, the pressure pushes some of theslurry out of the digester and back into boththe inlet and outlet tanks, causing the slurrylevel in each tank to rise.

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THE BIODIGESTER : CHINA FIXED DOME

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Fixed dome Chinese model biogas plant (also called drumless digester) was built in China asearly as 1936. It consists of an underground brick masonry compartment (fermentationchamber) with a dome on the top for gas storage. In this design, the fermentation chamber P

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C ) p g g g ,and gas holder are combined as one unit. This design eliminates the use of costlier mild steelgas holder which is susceptible to corrosion. The life of fixed dome type plant is longer (from20 to 50 years) compared to KVIC plant.

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THE BIODIGESTER : DEENBANDHU

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The Deenbandhu Model is a semi continuous-fed fixed dome Biogas plant. The design essentially consists ofsegments of two spheres of different diameters joined at their bases. The structure thus formed comprises of(i) the digester (fermentation chamber) (ii) the gas storage chamber and (iii) the empty space just above the P

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C (i) the digester (fermentation chamber), (ii) the gas storage chamber, and (iii) the empty space just above thegas storage chamber. The higher compressive strength of the brick masonry and concrete makes itpreferable to go in for a structure that could be always kept under compression. A spherical structureloaded from the convex side will be under compression and therefore, the internal load will not have anyeffect on the structure B

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effect on the structure. B

THE BIODIGESTER : MCRC

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S i AMM M g Ch tti R h C t (MCRC) M d h d l d b i k PLA

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C Sri A.M.M. Murrugappa Chettiar Research Center (MCRC), Madras, has developed a brickdigester with a high-density polyethylene gas holder supported by a geodesic frameThe frame is bolted to the digester walls, and the plastic gas holder is retained by awater seal. BIO

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THE BIODIGESTER : JYOTIEN

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This ensures that the heavier, partiallydigested material settles to the digester floorunimpeded by the lighter biomass. The JSEIinnovation could be an important

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breakthrough in the use of agricultural andforest residues in biogas systems. In additionto solving the problem of scum build-up, theJSEI technique also seems to eliminate the

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necessity of excessive shredding or drying ofresidues, making the handling of thesematerials far less cumbersome and time-

i g i i ly h d i t

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C g gis always in contact with the slurry, even withthe dome at maximum height, so that no gascan escape.

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THE BIODIGESTER : ASTRAEN

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Comparison of KVIC and ASTRA designs For similar Biogas Plants(40)

KVIC ASTRARated daily gas output 5.66 5.66G h ld di t ( 183 244

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Gas holder height (m) 1.22 0.61Gas holder volume ([m.sup.3]) 3.21 2.85Digester diameter (m) 1.98 2.59Digester depth (m) 4.88 2.44

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g pDigester depth-diameter ratio 2.46 0.94Digester volume ([m.sup.3]) 15.02 12.85Capital cost of plant (Rs) 8,100.00 4,765.00Relative costs 100.00 58.80Daily loading (kg fresh dung) 15000 15000

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P Daily loading (kg fresh dung) 150.00 150.00Mean temperature (Celsius) 27.60 27.60Daily gas yield ([m.sup.3]/day) 4.28 [+ -] 0.47 4.39[+ -] 0.60Actual capacity/rated capacity 75.6% 86.4%G yi ld ( /g f h d g) 285 [ / ] 32 P

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C Gas yield (cm/g fresh dung) 28.5 [+/-] 3.2 32.7 [+ or -] 4.0

Improvement in gas yield -- +14.2%

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BIOGAS SYSTEMS : Covered Lagoong

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Bag digester. This design was developed in 1960s in Taiwan. It consists of a long cylinder made of PVC or red mud plastic B

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TYPICAL BIODIGESTER : SYSTEM

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Feedstock collection — Sump Pulper / MixerAnaerobic digester — Effluent storage — ManureGas handling

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Gas use.

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TYPICAL BIODIGESTER : SYSTEMEN

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Feedstock collection — SumpPulper / MixerAnaerobic digester

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Effluent storage — ManureGas handling —

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Home pages:/ : http://www.careindia.co.nr : http://www.reindia.co.nr : http://www.biogas.co.nr email : [email protected] : Skype : carei.ndia Mob : +9122-8097119058 / +9122-8097127783

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BIOGAS SYSTEMS : Table A

Characteristics Plug Flow Digester Fixed Film

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Characteristics Plug Flow Digester Fixed Film

Digestion Vessel Above Ground Tank Rectangular in Ground Above Ground Tank

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Level of Technology Medium Low

Supplement Heat Yes No

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Total Solids 11 to 13 % 3 %

Solid Characteristics Coarse Very Fine

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HRT Days 15+ 2 to 3

Farm Type Dairy Only DairyC Farm Type Dairy Only Dairy

Optimum Location All Climates Temperate and Warm


BIOGAS SYSTEMS : Table AA

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Characteristics Covered Lagoon Complete Mix Digester

Digestion Vessel Deep Lagoon Round /Square In

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Level of Technology Medium Low

Supplement Heat No Yes

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Total Solids 0.5 to 3% 3 to 10 %

Solid Characteristics Fine Coarse

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HRT Days 40 to 60 15 +

Farm Type Dairy HogC yp y g

Optimum Location Temperate and Warm All Climates


BIOGAS SYSTEMS : 60’s

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for Digestors 2 20 Cubic Meters Plus

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BIOGAS SYSTEMS : C.A.R.E

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SL. No Plant Capacity Av. Daily Feedstock and Slurry (ratio of 1 Kg. Feedstock:1 Lt. Water) Requirement

Approx. No. of Av. Size Cattle

No. of family members (cooking and lighting

requirement)

Average cost as on

Sept 1, 2006

Feedstock Fresh Slurry

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(M3) (Ft3) (Kg) (Lt.) (Nos.) (Nos.) (Indian Rs.)

(a) (b) (c) (d) (e) (f) (g)

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for Digestors 2 20 Cubic Meters Plus1 1 35 25 50 2-3 3-4 10000

2 2 70 50 100 4-6 6-8 12000

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3 3 105 75 150 6-9 9-12 15000

4 4 140 100 200 8-12 12-16 18000

5 6 210 150 300 12 18 18 24 24000C 5 6 210 150 300 12-18 18-24 24000

Commencement to Commissioning 03 Days for Digestors from 1m3 200 m3


for Digestors from 1m3 200 m3

BIOGAS SYSTEMS : C.A.R.E

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A household digester unit or familysize biogas plant normally has thegas production capacity to meet

ProcessAbout two kg dry starchy matter mixed in about10 litres of water is the daily input. The retention

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all the cooking and 2-4 hours oflighting (using biogas lamps withsingle mental) needs of a family. InIndia 1 m3 biogas plant refers to

y ptime ranges from 12 to 24 hours, depending uponthe temperature.

The CARE model

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OF India 1 m3 biogas plant refers to

the rated capacity of thatparticular unit which has beendesigned to produce 1 m3, 1000 lt.

The CARE modelHas a gas holder tank of 550 litres capacity,having about 500 litres usable gas holding space.We advice the housewife to introduce a kg of

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gfeedstock once in the morning and again in theevening. Every time she gets about 500 litres of gas,which is enough to cook one meal for a family offive Families eating only rice may require just halfC five. Families eating only rice may require just halfof this quantity of gas.


Institutional Sized Bio Gas Plant

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Serving Over 15,000 People

Main digestion tank (35 m3), Manure pits, Gas lamps for utilisation of the biogas generated in the plant


plant.


C t d i g i lid

ENER

GY A biogas plant in a vegetable oil factory

Cost and savings in slide

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C t t C i i i g 10 D y f Dig t b 30 C bi M t C Commencement to Commissioning 10 Days* for Digestors above 30 Cubic Meters Instutional Plant with solar and pulper



Cost and savings

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A biogas plant in a vegetable oil factory

Cost and savings

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. Before KWPInstallation

After KWPInstallation

LPG Consumed 60 kg/day 30 kg/day

Before installing the Kitchen WastePlant (KWP) 60 kg per day of LPG isbeing used in the Canteen kitchen ascooking fuel. The KWP will utilize 600

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Cost of LPG/annum Rs. 4.95 Lacs Rs. 2.47 Lacs

Net Annual Savings Rs. 2.47 Lacs

C t f Kit h W t Pl t R 3

cooking fuel. The KWP will utilize 600kg/day of Kitchen Waste generatedand generate 60 m3/day of biogas,which is equivalent to about 30kg/day of LPG. This will replace 30

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Less 100% Dep. Benefit in 1st year Rs.1.15 Lacs

Net cost of Kitchen Waste Plant Rs.2.35 Lacs

kg/day of LPG. This will replace 30kg/day of LPG used in the canteenkitchen. KWP serves duel purpose ofdisposing the Kitchen Waste, thusmaintaining hygienic and cleanC

Simple Payback 0.95 Years

Net Reduction in Cooking Energy Cost 50 %

maintaining hygienic and cleansurroundings and replacing 50% ofCooking Fuel with Biogas generated


A Perspective and Comparativep p

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Parameters Conventional Systems CARE System

Time needed for construction to commissioning for 1CUm / 20 CUM 25 days / 90 to 120 days 1 Day / 30 Days

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Fermentor Volume for Family of Four to Six.

Large 4000 Litres

Small1000 Litres

Conventional MS Dome prone Composite New Age PVC

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to corrosionComposite New Age PVC non corrosive

Percentage of Methane by weight 60 % 25%

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Quantity needed from system for a family of four 1980 Litres 800 Litres

Carbon Dioxide 20 % to 30 % 5 % to !5 %C

O & M Intensive Easy


A Perspective and Comparative

Parameters Conventional Systems CARE System

p p

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Amount of required feedstock 40 kg + 40 lit water 1-1.5 kg + 15 lit water

k g g Any starchy material Kitchen

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Nature of required feedstock Dung organic material Any starchy material Kitchen Waste. Left over Food,

Amount and Nature of slurry to be disposed 80 lit, sludge 15 lit, watery

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HRT Retention Time for full utilization of feedstock 40 days 48-72 hours

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Standard size for household 4000 lit 1000-1500 lit

Capital Investment per unit including stove INR 20,000 INR 10,000

C including stove

Running Expenses per meal INR 25 0 to INR 5


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Biogas to Electrical Generationg

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Kind of i l

Manure Amount(k /d )

Solid amount

Biogas per animal

Energy per animal

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animal type (kg/day)amount (kg/day)

animal (m3/day)*

animal(kWh/yr)

Cow Slurry 51 5,4 1,6 3400

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Cow Dry 32 5,6 1,6 3400

Sow Slurry 16,7 1,3 0,46 970

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Sow Dry 9,9 2,9 0,46 970

Hen Dry 0,66 0,047 0,017 36C y

Quantity of feedstock from farm animals and Potential Captive Energy


A Perspective and Comparativep p

ENER

GY Equivalent Quantity of Fuel for 1 m3 of Bio-Gas

Name of the fuel Kerosene Firewood Cowdung Charcoal

Biogas and Biomass

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cakesCharcoal

Equivalent quantities to 1 0620 3474 kg 12296 1458 kg

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m3 of Bio-gas0.620 3.474 kg 12.296

kg1.458 kg

Name of the fuel Soft coke Butane FurnanceOil

Coal gas Electricity

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Equivalent quantities to 1 m3 of Bio-gas

1.605 kg 0.433 kg 0.4171 1.177 m3 4.698 kWhC m of Bio gas kWh


A Perspective and …………………p

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Centre for Application of Renewable Energy. sees the growing demand fromconsumers for green energy as a sign of changes in the power market.

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A distributed network of smaller scale electricity producers provides numerousbenefits to the viability of the power supply: diverse domestic energy sources,lower transmission costs, use of existing infrastructure, etc. It's also a boon to

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glocal, rural economies, as jobs and revenue arise from what was onceconsidered a smelly, costly nuisance.

Biogas Energy is working to create a new model of energy production for the

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P Biogas Energy is working to create a new model of energy production for thefuture, one where efficiency, reliability, and scalability work to the advantageof our nations' farmers and rural communities

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THE Biogas Engine

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THE Biogas Engine

THE Biogas Engine “CARE”

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•THE Biogas Engine “CARE”•Biogas specific Engines using 100 % Biogas

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•Works without battery ideal for rural areas.

•Gas cooled, water cooled air cooled

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•Spark ignition 1500 to 1800RPM

Automatic air and fuel

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•Single Phase and Three Phase

lt t d gi l d C •Alternator and Engine coupled on single rigid frame

•Gas Consumption of 600 Cft per KWH


per KWH

How much does an anaerobic digestion facility cost?

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The cost of an AD facility depends on many factors, and would becalculated before any work was started.

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A key decision point is not only how much the facility costs; it's howmuch revenue the facility generates.Centre for Application of Renewable Energy’s combination of higher

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OF energy production and waste management revenue means a superior ROI

and greater lifetime revenue stream over other options.We invite you to fill in our information request form or contact us for

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P y qmore information.

We would be happy to show what we can do for you.C ppy y


How do Biogas Energy Systems?

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Centre for Application of Renewable Energy uses technology that has been

with other anaerobic digestion technologies?

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E E Centre for Application of Renewable Energy uses technology that has been

perfected in digesters over the past decade, with more designed and built eachyear.

t f A li ti f bl gy dig t

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OF Centre for Application of Renewable Energy ' digesters are 30-100% more

efficient in producing energy than other digesters.

The fact, coupled with the ability to take a variety of waste input means Centre

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What is your cow to kW ratio? EN

ERGY

In other words how efficiently do your digesters produce energy?

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Unfortunately this ratio, which is often used by digester developers, has littlemeaning in the real world since our digesters are able to accept a variety of

In other words, how efficiently do your digesters produce energy?

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OF substrates and therefore create far more methane than manure digesters

alone. By adding high energy inputs like grease or fats, there is no comparisonto our competitors who are only able to accept manure or a limited amount

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of lower-energy inputs

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What materials can "feed" your digesters?EN

ERGY

Centre for Application of Renewable Energy operate with a base material off l ig ddi i h dig h i i h h i

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manure from cattle or pigs. In addition, the digesters thrive with other inputs,like kitchen waste, brewery waste, industrial food processing waste, energycrops like corn, fish and poultry remnants, ethanol production waste, and more.

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This is a significant advantage over other types of digesters that can onlyprocess manure, and adds an enormous amount of power generation capacity

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to the facility

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Besides biogas, what comes out of the digesters?EN

ERGY

Th li id th t lt f th bi dig ti h

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E E The liquid that results from the anaerobic digestion process have a

slurry which is separated out, and sold to local gardeners,landscapers and farmers.

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OF Some farmers use the solids as bedding for their cows and sell it

as bedding to neighbors since the pathogen treatment is soeffective. The liquids are returned to the farmer as nutrient rich

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Does a biogas facility smell?EN

ERGY

Actually, anaerobic digesters alleviate odor problems, especially as

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suburban growth surrounds farms and introduces neighbors whocomplain about manure smells. By installing an anaerobic digester.

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The farmer solves odor issues to everyone's satisfaction. Since thedigesters are airtight, the smell stays within, and the liquids and solidscoming out of the digester have only a very slight odor compared to

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Anaerobic Digester TechnologyImprovements and OptimizationsImprovements and Optimizations

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bi dig i i g i i g l i y i di d l

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E E Anaerobic digestion is gaining popularity in India due to several

factors, not least of which is the continuing improvement of biogasproduction technology. In India.

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In Europe, where anaerobic digestion facilities are in operation,optimization of digester technology continues to this day. Theimprovements and optimizations that have been made in Europe are

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Low maintenance, high efficiency technology

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Farmers already have enough work, so our anaerobic digesters require minimal

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OF labor and maintenance without sacrificing efficiency of methane production or

pathogen treatment. By continually improving techniques and equipment that

have been built

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……..And about US ???

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Centre for Application of Renewable Energy Inc. was founded in 2004 toaddress India's pressing need for renewable domestically produced power

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OF address India s pressing need for renewable, domestically produced power.

Centre for Application of Renewable Energy licenses technology that hasbeen the most reliable, efficient, tried and tested anaerobic digestiontechnology to the Indian market.

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Centre for application of renewable energyC

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302 /A 1 Bhimashankar,Sector 19-A Nerul,Navi Mumbai C 9 ,

400706 .. Maharashtra. INDIAEMAIL : [email protected]

HOME Page : www.careindia.co.nr


Understanding Biogas Ver 1.1

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Transcript of Understanding Biogas Ver 1.1