The least expensive and most suitable excreta disposal unit for rural areas would be
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Rural areas need basic human waste disposal systems which are inexpensive and easy to use. One such system is the Bio-digester toilet, which easily converts human excrement into manure and gases. The Bio-digester toilet system uses psychotropic bacteria such as Clostridium and Methanosarcina, which feed on human waste and convert it into water and gases.
Currently, the Indian Railways has introduced such toilets in trains which are found to be very eco-friendly and effective.
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pit pirvy is the answer
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