Synergetic conditioning of sewage sludge via Fe2+/persulfate and skeleton builder: Effect on sludge characteristics and dewaterability

Principal component analysis on sewage sludge characteristics and its implication to dewatering performance with Fe2+/persulfate-skeleton builder conditioning

“…The amount of VSS/TSS, on the one hand, directly affects the flocs composition and compressibility; on the other hand, in terms of EPS type and content account, VSS/TSS reflects a dominance of the volatile components in sludge during Fe 2? /S 2 O 8 2--phosphogypsum conditioning (Shi et al 2015b). Moreover, higher initial SC also means less water, which would therefore result in an increase in the activation reaction rate due to the conditioning system containing high concentrations of the reactants at a fixed S-P dosage.…”

Enhancing the sludge dewaterability by electrolysis/electrocoagulation combined with zero-valent iron activated persulfate process

“…The disposal of wastewater sludge still remains crucial technical challenges due to the high moisture content of different types of sludge [3]. Dewatering is an important step for reducing water content and sludge volume, which is an efficient method to reduce transportation and disposal costs [3][4][5]. However, the complex colloidal nature and strong hydrophilicity of the WAS substantially hamper the dewatering process without pretreatment, failing to meet the requirements of subsequent sludge disposal [3,6].…”

“…The AOPs methods improve the dewaterability of the sludge by affecting the EPS in two ways: (1) they have the potential to degrade the EPS and; (2) they affect the multifunctional groups of the EPS and promote their participation in several interactions [13]. Typically, the release and degradation of EPS is mainly based on the generation of extremely reactive species like hydroxyl radicals (HO Å ) and sulfate radicals (SO 4 ÀÅ )…”

“…in AOPs [4,5,14]. In Fenton reaction, hydrogen peroxide was catalytically decomposed ferrous ion under acidic condition (normally pH 3) to generate HO Å (Eq.…”

Effect of Sludge Conditioning Temperature on the Thickening and Dewatering Performance of Polymers

“…These include mixing used during conditioning [3,4], shear exposure after conditioning [5], polymer type and chemistry [6], pH [7], metal ions [8], ionic effects [9,10], extracellular polymers [11] as well as sludge temperature. It has been known that cold temperatures are not ideal for conditioning but there have not been extensive studies on the effect of sludge temperature on sludge conditioning, thickening and dewatering.…”