Question

For example, a vegetable market in Muscat disposes 150 kg of rotten vegetables daily basis. Write a project proposal to use this disposed rotten vegetables to meet electrical loads by producing methane with neat sketches

Answer 1

• The process of bio-gas production is anaerobic in nature. The groups of methanogenic bacteria act upon the organic acids to produce methane gas.
• The kitchen waste or the market waste which includes rotten vegetables could be further processed to yield methane/biogas. In order to do so the following components are needed :- A mixer/pulper for crushing the solid waste ,Premix tanks, Predigester tank, Solar heater for water heating, Main digestion tank, Manure pits, Gas lamps for utilisation of the biogas generated in the plant.
• A high temperature is maintained in the predigestor tank. The growth of thermophiles in the predigestor tank is assured by mixing the waste with hot water.
• Then, the slurry enters themain tank where it undergoes mainly anaerobic degradation. Methanococcus bacteria are naturally present in the alimentary canal of ruminant animals and, they produce mainly methane.
• The undigested lignocellulosic and hemicellulosic materials then are passed on in the settling tank, which could be further used as manure in later stages.
• As the gas is generated in the main tank, the dome is slowly lifted up. This gas is a mixture of methane (70-75%), carbon-di-oxide (10-15%) and water vapours (5-10%). It is taken through GI pipeline to the lamp posts. 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. Thus, helps in meeting the electric loads.

Please give a thumbs up if the answer helped you. Thankyou!