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Paperback. Zustand: Fair. 135 pages. reasonable ex libraryThe production of biogas, which is regarded in many countries as a by-product of an efficient system of energy production, has become in China a comprehensive, controlled method of waste disposal, recycling resources, supplying energy and f ertilizer and improving rural health, as the digesting of wastes in a closed con tainer kills many of the pathogens responsible for common human diseases. There are already approximately seven million biogas pits in opertion, with Sichuan (S zechuan) province leading the country in a movement to extend the practice throu ghout the countryside. This manual describes in detail how to build the pit, and covers a full range of designs to suit various soils from sandstone to sheer ro ck. It also includes a description of how the original manual was used.…