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Sunday, December 17, 2017

HOW TO START UP AND RUN A BIO GAS PLANT

HOW TO START UP AND RUN A BIO GAS PLANT

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SUNDAY, MAY 02, 2004


STARTING UP A BIO GAS PLANT


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

CRUSHER(less than 7mm particle size)----thermophilic primary digester(Temp 55 degree C)---Mesophilic Anaerobic Digester(37 Degree C and pH above 7)---Manure Pit


STARTING UP A BIO GAS PLANT:
Step One: Development of bacteria culture.  Fill up  the main anaerobic digester tank with cow dung diluted with water in 1:1 ratio fully . Add jaggery (GUR) 5% of capacity of plant ( a 100kg per day food waste plant will require around 5 kg jaggery (GUR). Left to ferment for  three- four days. The cow dung slurry will start forming gas after three-four  days. 

Step Two : Check for leaks using air pressure in the digester and gas pipes. Wait for  three four days before feeding the system with food waste. Before that check for any leaks for bio gas.

Step Three: Food waste feeding.Feed the system with slurry of food waste and water from crusher .Initially feed small quantity, increase slowly and after one week feed full capacity daily to the plant.  The ratio of food waste and  water  is 1:1.
A heater, steam or heat exchanger (Hot Water Jacket) is used maintain  temperature in the pre digester at 55 degree C. The heat exchanger can be either internal or external.


Step Four: Initial production of gas will consist of oxygen, methane, carbon di oxide and some other gases and will not burn. These gases can be released to the atmosphere by opening the ball valve at least three / four times at a gap of three days each.

Subsequent gas will consist of about 70 to 80 percent methane and the rest carbon di oxide, which can be used in a single bio-gas burning stove or a Bunsen burner. After thirty days of continuous feeding of the plant,do a sample bio gas test to know exact position of your plant. Any problem area can be solved after getting bio gas testing report.

A mechanical mixer or return bio gas can be used for mixing of the content of anaerobic digester

Step Five: Digested slurry  removed from the top of the  the manure pit, which can be collected, diluted and used as organic manure.

Step Six: The  value  of    pH  of  the  anaerobic digester  should  be ideally kept  at or above 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 anaerobic digester chamber to maintain pH at 7.

DO NOT USE eggshells, Onion peels or left-over bones in this system as they will affect the efficient functioning of the system

Hazards: Methane in a concentration of 6 to 15 percent with air is an explosive mixture. Since it is lighter than air, it will collect in rooftops and other enclosed areas. It is relatively odorless and detection may be difficult. Extreme caution and special safety features are necessary in the digester design and storage tank


2 comments:

Anonymous said...

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Patrachar Vidyalaya School said...
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