Manufacture of BIOGAS

Sources

Sewage, agricultural waste, manure, food scraps and plant material

Crushing

The waste is crushed and mixed with water to form a slurry

Digestion

The slurry is placed in an anaerobic digestor, a sealed container, where the organic waste is broken down by anaerobic bacteria

Gases

The anaerobic bacteria produce methane and carbon dioxide. Other gases may also be present like hydrogen sulfide

Collection

The biogas is collected in gas storage chambers

Purification

The impurities like hydrogen sulphide can be removed through sodium hydroxide scrubbing to improve quality

Uses

The biogas can now be used for cooking and heating. The digest is used as organic fertilizer

Environmental impact

When the digest from the biogas production is irresponsibly disposed, it may end up in water bodies where it contaminates water and causes bad smell and diseases when people drink the water

Mitigation

This can be mitigated through proper disposal of this digest and using it as organic manure