Rural energy solutions

Rural energy solutions

Biogas is the most ideal solution for rural energy. Rural homes require cooking fuel and electricity and they are in need of a reliable electricity option that has a local source of supply. Moreover, considerable quantities of raw material are available in the rural areas for biogas production. Typical substrates, i.e. raw materials that can be used for biogas production in rural areas include:

  • Agricultural waste: Maize, jawar, bajara, rice, sorghum, etc.
  • Food processing waste
  • Sugar factory: Molasses, spent wash, and press mud
  • Industrial waste: oilcakes and de-oiled cakes, maize husk, starch effluent, etc.
  • Other waste: Kitchen and hotel waste, organic waste in MSW
  • Cultivated substrate: Napier grass, Elephant grass, Safflower, etc.

As seen from the figure in the link How it Works, after removing unwanted impurities, biogas can be used as engine fuel to generate electricity. If the purity of methane can be increased to over 90%, then the gas can be compressed to high pressures of over 200 bar and stored in cylinders. It can then directly replace CNG, even for vehicular applications.

The effluent from the biogas plant is in the form of slurry, called digestate. Liquid from the digestate can be separated by processes such as decantation or using simple techniques like a sand-bed filter. It could then be recycled into the biogas plant or can be used as nitrogen rich liquid fertilizer. The solid effluent is almost completely composted biomass. It can be used as manure. When minerals and micronutrients are mixed with the manure, it could be converted into fertilizer, which is a value added product.


How it works

Rular energy