A wastewater treatment plant consists of primary treatment followed by an activated sludge
secondary system. Sludges from the primary clarifier and waste-activated sludge from the
underflow are mixed and thickened in a gravity thickener. The primary sludge contains 1250
kg of dry solids per day with a 4 percent solids content. The waste-activated sludge contains
525kg of dry solids per day and has a solids content of 1.2 percent. After thickening the mixer
has a solids content of 3.0 percent. Calculate
(a) The volume of sludge that must be processes after thickening and
(b) The percent volume reduction in the thickener.
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Answer:
Sludge Thickening
The sludge thickening and dewatering are modeled using the approach of Gernaey et al., (2014).
From: Computer Aided Chemical Engineering, 2019
Related terms:
Wastewater TreatmentSludge TreatmentAmmoniaNitrogenDissolved Air FlotationExtracellular Polymeric SubstanceCentrifugeClarifier
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