Dewatering Characteristics

Lime has been used extensively in the past as a conditioning agent to improve the dewaterability of sludge (although lime conditioning and lime stabilization are different processes). Lime-conditioned sludge usually needs additional conditioners, such as ferric chloride, to improve its dewaterability. Additional lime in excess of the dose required for conditioning is typically necessary for stabilization, and this also results in improved dewaterability over that of untreated sludge. One potential drawback to mechanical dewater-ing of lime-stabilized sludge is the likelihood of scaling problems from the high lime doses.

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