Simple Methane Production from Household Waste

Household waste can be processed to be methane in simple systems. First, in this system, the waste is put into the warming bed. In the warming bed, the waste is fermented by methanogenic bacteria resulting in raw methane. The side product can be used as fertilizer. The raw methane flows through a pipe into dirt trap. In his place the pure methane and dirt are separated. The methane which is lighter occupies the upper side and heavier dirt will reside at lower side. Then the pure methane flows into half-water-filled and top-sealed tube called gas indicator. The bubbles in the water indicate the existence of methane. The methane fulfills the rest of the tube and become saturated. After that, the methane flows to the next pipe that is also connected to the gas indicator. The methane then experiences increasing of its pressure due to the inner tubes that is loaded by weight. Now the methane can be taken from the tap at the end of the gas holder. If the pressure of the methane is too high, the excess gas will flows to a top-opened and water-filled tube. In this way the excess gas can be released to the air so the stability of the system can be maintained.