Among the large number of problems concerning water resources protection from pollution that of treatment and disposal of wastewater sludges is the least developed and the most serious from the engineering and ecological points of view. The importance of the problem arises from the constant increase of sludge masses due to increasing treatment efficiency and the ever increasing amount of wastewaters to be treated. This paper discusses wastewater sludge treatment and utilization in the U.S.S.R.
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