Dehydrating sewage sludge by admixing cellulosic wastes - to create optimal conditions for biological decomposition and prodn. of compost

摘要

Sludge from municipal sewage clarification tanks is mixed with waste paper, cardboard, cellulosic textiles, or sawdust and other wood wastes to effect dehydration and ensure the optimum carbon, nitrogen ratio and moisture content for biological decomposition and formation of compost. Alternatively, the dehydrated produce can be burnt. Waste paper or cardboard exerts strong dehydrating effect due to capillary forces. Cellulosic textile materials greatly facilitate filtration. Acids, such as H2SO4 are not used so that the product is harmless and can be used as compost.