Bio-gas is produced during the biological breakdown of organic solids through anaerobic digestion. The gas resulting from this process is an energy source that can be collected and utilized or safely burned.
Recovered Bio-gas can be used in many ways :
- Run generators to produce electricity
- Run boilers to heat the anaerobic digester or the treatment facility
- Eliminate natural gas and propane usage for cost savings and profit
Anaerobic digestion is a very safe and effective way of treating bio-solids from municipal and industrial waste-water. It is ideal for meeting strict environmental regulations, especially with emission standards becoming more stringent in urban areas.
The anaerobic process takes place in the digester (closed tank), covered ponds or lagoons by the use of a thermophilic or mesophilic process. Landfills also generate Bio-gas naturally as buried organic refuse biodegrades.
THE BIO-GAS SYSTEM
Bio-gas collection and utilization are important to the anaerobic digestion process. The gas is saturated and contains elements harmful to people as well as corrosive to piping and equipment. It is important for the Bio-gas handling equipment to be of high quality and operate as a system.
- Moisture and Sediment :
Bio-gas is saturated when it leaves the digester, covered pond or lagoon. In order to avoid damage to downstream equipment, moisture and sediment should be removed. A Condensate and Sediment Trap with drip trap should be located immediately downstream of the digester, covered pond or lagoon. A condensate accumulator should be considered when an accumulation of condensate is expected. This will help lower operating and maintenance costs.
- Foam :
Pressure and vacuum relief valves with flame arresters are installed on digester covers. When foam clogs the flame arresters, it may prevent the pressure and vacuum relief valves from properly relieving pressure or vacuum accumulation which could cause damage to the digester and the digester roof. Emergency pressure or vacuum relief can be accomplished by installing emergency relief valves. Installing a foam separator immediately downstream of the digester will prevent foam from entering downstream of the digester.
- Flames :
Flame arresters should be installed between ignition sources and vital equipment. In addition, thermal shut-off valves should be used along with all in-line arresters. Flame arresters should be installed along with all pressure and vacuum relief valves on the digester roof to prevent external flames from igniting gas inside the tank.
Check valves should be located where a reversal of flow would damage rotating equipment or disrupt the system’s pressure balance. Bio-gas can become explosive within flammable concentrations of gas and air.
This schematic is for general presentation purposes only and is not intended to represent a specific design. Please contact us for complete product information.
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