Dewatering of Municipal Sludges
Dewatering processes considerably affect costs of sludge treatment and disposal.
On the basis of a survey carried out in European Countries, the status and trends regarding conditioning and dewatering of municipal sludges are discussed.
Conditioning methods and laboratory tests for determining optimal conditioner dosages and predicting sludge behaviour in dewatering are outlined briefly.
The paper also presents a general description of dewatering systems and attention is given to the influence of operating variables on dewatering performance.
A literature data analysis allows us to outline typical conditioner demand and performance of each dewatering operation, as functions of feed sludge type. The discussion is completed with data on labour and energy requirements.
Furthermore, a few results of experimental activity carried out within the EEC Concerted Action to study the mechanisms of conditioning and some dewatering operations are presented.
KeywordsFiltration Sludge Sewage Beach Lime
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