Abstract：
:Chemical conditioning before mechanical dewatering is an indispensable step to enhance the waste activated sludge (WAS) dewaterability and solid-liquid separation. Feasibility of utilizing Fe(II)/S2O82- oxidation integrated with microwave irradiation (MW) in improving gel-like floc destruction, water seepage and WAS dewaterability was investigated. Comprehensive characterization of the treated WAS was conducted to explore the effects of MW on the catalyzing kinetics of Fe(II)/S2O82- oxidation and reveal the underlying dewatering principle. The results demonstrated that MW-Fe(II)/S2O82-process was more cost-efficient, reagent-saving than single Fe(II)/S2O82- oxidation or MW irradiation in stimulating WAS dewaterability and the optimal conditions were 0.4/0.5 mmol-Fe(II)/S2O82- g-1-TS (total solids) and 500 W with 94.6% capillary suction time (CST) reduction within 120 s of conditioning. Thermal effect of MW reduced the activation energy of S2O82- decomposition and stimulated the generation of more SO4-· while athermal effect could create additional gel-network destruction and cell lysis, which reduced the water-binding energy and induced the seepage of more extracellular polymeric substances (EPS)-bound and cell water. Further analysis via fluorescence excitation-emission matrix combined with parallel factor analysis demonstrated that protein-like, humic- and fulvic-like substances in slime EPS (S-EPS) and loosely bound EPS (LB-EPS) together affected sludge dewaterability. Additionally, the hybrid process could further remove the released COD and ammonia, facilitating the subsequent advanced treatment.
journal_name
Chemospherejournal_title
Chemosphereauthors
Zhen G,Wang J,Lu X,Su L,Zhu X,Zhou T,Zhao Ydoi
10.1016/j.chemosphere.2019.01.037subject
Has Abstractpub_date
2019-04-01 00:00:00pages
141-153eissn
0045-6535issn
1879-1298pii
S0045-6535(19)30037-2journal_volume
221pub_type
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