HOME BIO GAS PLANT FOR A SMALL FAMILY 1 CUM 30 kg cow dung

 HOME BIOGAS PLANT FOR A SMALL FAMILY 1 CUM OF BIO GAS PER DAY

Gas Volume :

One Cu. Mtr. Bio Gas runs approximately 1 Hour at a time. One can cook three meals per day by using 1 cum Bio Gas Plant.1 cum of biogas is equal to 0.43 kg of LPG.We can use Bio Gas frequently about three times a day with an interval of around 2 to 3 hours.

About 8 kg. of kitchen or poultry waste/ 30 kg cow dung( 3 cows) / 20 kg buffallo dung   is required for 1 cum of raw bio gas.This is equal to one gas cylinders per month

One cow produces an average of 10 kg of wet dung a day, equivalent to approximately 2 kg of dry matter.

It has been demonstrated that gas produced from the dung gobar of at least three cows(30kg)  is sufficient to replace about 75 percent of the fuel wood normally used by a family of six people (Dalibard, 1995).

The gas generated will have 60 to 70% methane, 5 to 10% water vapour (moisture) and the balance will be Carbon-di-oxide.
Gas coming out of the plant can be used in the kitchen with the help of biogas stove while the slurry coming out from the outlet can be used as manure. 

30 kg cow dung bio gas plant giving raw bio gas 1 CUM

An one thousand liter capacity Digestion tank will be sufficient for a small household for daily cooking purpose.

1000 liter water tank sintex or eqvt (Fixed dome biogas digester) , inlet pipe, outlet pipe, gas pipe(10 Feet length) , gas control valve and user manual: TOTAL COST  INR 25,000/=Ex Delhi, GST included. (Transport and packaging extra)

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KITCHEN WASTE BIO GAS PLANT FOR A SMALL FAMILY: 2CUM is the ideal plant

 

Gas Generation Capacity	SIZE OF TANKS (PVC)		Mix Kitchen Waste / day	Water / day	Initial Cow Dung charging
	DIA	HEIGHT
0.5 Cu. Mtr	1600	1100	2.5 Kg	2.5 Litrs of Water	20 Kg
1.0 Cu. Mtr	2100	1500	5 Kg	5 Litrs of Water	25 Kg
1.5 Cu. Mtr	2300	1650	10 Kg	10 Litrs of Water	30 Kg
2.0 Cu. Mtr.	2550	1800	20 Kg	20 Litrs of Water	35 Kg

How it works for KITCHEN WASTE :

The main digester is initially fed with fresh cow dung slurry so that slurry comes out from the slurry outlet pipe. The ratio of dung and water should be 1:1 Subsequently, cattle dung is not needed. Now wait for biogas production to start in the newly installed plant. It may take 2-3 days for the first production of gas.

As gas starts producing, one can start feeding the plant daily with  kitchen / vegetable waste in a small quantity and increase it to the recommended quantity after one week.. The ratio of kitchen waste and water should be 1:1.This will facilitate easy flow of waste through inlet  into  the  bio-methanization  plant.  The  value  of    pH  of  the  kitchen  waste  should  be ideally kept  at 7 for optimum production of biogas. Make a slurry of lime by adding one kg lime with 10 liter of water and add it into the digester chamber to make pH 7. Check with pH paper whether the pH is 7 or not regularly.

LOCATION:  Always in a sunny area where temperature is high (30 degree) and as near to kitchen as possible so that gas pipe length is less.

OPERATING COST : The operating cost of Bio Gas plant is very less.  All what required for 1 Cu. Mtr Bio Gas plant is  5 to 6 Kg of Kitchen waste / on dry weight basis. Break even period is approximately 5 to 6 years if Gas is used for cooking application   

   

ALL ABOUT ENVO BIO GAS PLANT

ALL ABOUT ENVO BIO GAS PLANT 

                           CONTACT US ENVO PROJECTS Mobile: 09899300371

ONLINE BIO GAS CALCULATOR 

http://www.anaerobic-digestion.com/html/biogas_calculator.php

POST NUMBER :08   Date : 02/05/2004
BIO GAS PLANT PROCESS DESCRIPTION:

FLOW CHART: CRUSHER(less than 7mm particle size)----thermophilic Aerobic digester(Temp 55 degree C  )---Mesophilic Anaerobic Digester(37 Degree C )---Manure Pit

Biotechnology process

stage one : hydrolysis by hydrolytic bactaria, conversion of extracellular molecules

stage two : thermophilic fermentation based on carbohydrates

stage three : synthesis of volatile fatty acids by acetogenic bacteria

stage four : synthesis of methane by methanogenic organisms

The Principle:

Add bio degradable Solid waste  into predigestor tank. 

Use of thermophilic microbes for faster degradation of the waste. The growth of thermophiles in the predigestor tank is assured by mixing the waste with hot water and maintaining the temperature in the range of 55-60oC. The hot water supply is from a solar heater. Even one-hour sunlight is sufficient per day to meet the needs of hot water.

After the predigestor tank the slurry enters the main anaerobic tank where it undergoes mainly anaerobic degra-dation by a consortium of archae-bacteria belonging to Methanococcus group.  They produce mainly methane from the cellulosic materials in the slurry.

The undigested lignocellulosic and hemicellulosic materials then are passed on in the settling tank. After about a month high quality manure can be dug out from the settling tanks. Earth worm can be introduced to settling tank to speedup the process.There is no odour to the manure at all. The organic contents are high and this can improve the quality of humus in soil, which in turn is responsible for the fertility.The manure generated is high quality and can be used in fields.This manure can be supplied to farmers at the rate of 4-5 Rs. per Kg. Alternatively municipal gardens and local gardens can be assured of regular manure from this biogas plant.

As the gas is generated in the main tank, the dome is slowly lifted up. This gas is a mixture of methane (70-75%), carbondioxide (10-15%) and water vapours (5-10%). It is taken through GI pipeline to the gas purification unit. Drains for condensed water vapour are provided on line. This gas burns with a blue flame and can be used for cooking as well.

The gas generated in this plant is used for gas lights fitted around the plant. The potential use of this gas would be for a canteen. The purified gas can be fed to bio fuel electric generator to produce electricity. Gas can be bottled and used to run vehicles.

Tanks of Biogas Plant

1.     Mixer with stirrer to mix hot water (1:2) to form a slurry,

2.     Aerobic Digester,

3.     Anaerobic digeter

Mechanical Items :

1.Gas Holding MS Steel Dome

2.Steel Fabricated Covers on Manure Pits,

3.Mixer Stirrer ,

4.Air Compressor

5.Gas Holder and gas purification system

6.Water Pump and Slurry Pump

7.Water and Gas Pipelines on Plant area

8. Electric Fittings & Miscellaneous

Cost details, saving and payback period from a biogas plant:

The cost details and the savings envisaged from the plant are given in the following table. The life of the plant could be 20-30 years and payback period is 4-5 years.

Capacity (Tons / Day)	Installation Cost (Rs In Lacks)	Monthly Operation and Maintenance Charges (Rs)	Methane Generation M3	Manure production (tons /day)	Area Required M2	Power	Manpower	Fresh Water (KL /day)	Hot water (Ltr / day of 50-60 C0)	Cooking Fuel (Equivalent to LPG Cyl / day)
1	30-35	8,000/-	100-120	0.1	300	5hp(2hr)	2	2	200	2-3
2	36-39	12,000/-	200-240	0.2	500	5hp(3hr)	3	3	400	4-5
4	60-65	22,000/-	400-480	0.3	700	5hp(3hr)	4	5	400	8-10
5	85-87	30,000/-	500-600	0.5	800	10hp (4hr)	5	7	600	12-14 (25Kw)
10	1 cr -1.2 cr	50,000/-	1000-1200	2.5	1200	15hp (4hr)	10	15	1000	22-25 (50Kw)

* This is an approximate cost for biogas generation plant and may increase by 10%–20%, depending on location, site-specific parameters, cost of materials, labour cost, etc., in different states/cities. Cost of additional infrastructure like office space, toilets, security, Godown, Shades and power generation will be extra, if required.

Rs – rupees; m3 – cubic meters; m2 – square meters; h – hour; kL – kilolitre; LPG – liquefied petroleum gas; kW – kilowatt; cyl –

Decentralised treatment options introduced in new rules.

The earlier rules relied on costly centralised facilities for treating and disposing municipal wastes while approximately 50 per cent of it can be easily turned into compost at the local level. Thus, the draft rules have made the much-needed provision for providing incentives to decentralised waste treatment facilities. 

http://www.downtoearth.org.in/blog/a-clean-country-in-the-offing-with-new-solid-waste-rules-49484

Considering an average garbage generation per capita per day as 0.450 Kg, we can assume a total garbage generation for a population of 100,000 as 45,000 Kg per day

Proven on wide range of wastes and feedstocks including

• Livestock and agricultural wastes
• Biomass
• Sewage and industrial sludges
• MSW and catering wastes
• Food industry wastes
• Vegetable market waste
• Restaurant Waste
• Farm House/Cattle manure waste
• Slaughter House/Tannery waste
• Presumed waste

Suitable locations for installation of plant

Hotel premises, army/big establishment canteens (private/ government), residential schools/colleges, housing colonies, religious places / temple trusts, hospitals, hotels, sewage treatment plants, villages, etc.

POWER GENERATION: Bio Gas production = 100 cu mtr /day for 0.5 ton of waste

Methane content (65.75%) = 65.75 cu mtr

Calorific value =28.9 MJ/N.cu mtr

Energy content 65.75x28.9x273/(273+30)=1712 MJ/Day

Generator efficiency--- 30%

Electricity generated =0.3x1712x1000000/3600x1000

= 142.66

Electric power generated = 142.66x0.04167=5.944 kw say 6 kw

= 1.25x 6= 7.5 kva.

We can go for a gas engine of capacity 5 KW . If any gas is left , it will be flared or supplied to staff quarters

Multiply the number of animals by biogas production number...

Example: 600 hogs x 720 m³ biogas / hog / yr = 432000 m³ biogas / year

Multiply the result by the numbers below for cogeneration of electricity and heat...

____________ x 1.7 kWh/ m³ biogas = _________ kWh of electricity per year

____________ x 7.7 MJ/ m³ biogas = _________ MJ of heat per year

Multiply the result by the numbers below for heat production using boiler....

____________ x 15 MJ/ m³ biogas = _________ MJ of heat per year

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