Enhancement the conditioning of waste activated sludge through a sequence of freeze/thaw-electro-Fenton process

Shahheidar, Narjes; Jorfi, Sahand; Takdastan, Afshin; Jaafarzadeh, Neemat; Ahmadi, Mehdi

doi:10.2478/pjct-2018-0007

Abstract

Sludge conditioning is an important stage in sludge management. In the present study, a sequence of freeze/thaw-electro-Fenton process was designed and specific resistance filtration (SRF) was monitored during sludge conditioning as an important factor in sludge dewaterability. Furthermore, protein and polysaccharide concentrations were measured during the experiments. Results showed that the lowest SRF value contributed to −10°C in freezing process which showed a reducing trend by decreasing solution pH. In addition, results revealed that solution pH less than 3 caused a significant improvement in sludge dewatering; so the lowest SRF has been registered at pH = 2. By increasing current intensity from 0.5 to 1A, SRF values were reduced and then followed by an enhancement with increasing current intensity to 3.2 A. The lowest SRF value (6.1 × 10⁴ m/kg) was obtained at H₂O₂ = 30 mg/L which was the best conditions for sludge dewatering.

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Enhancement the conditioning of waste activated sludge through a sequence of freeze/thaw-electro-Fenton process

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