Performance and mechanism of sludge dewaterability enhanced by potassium ferrate pretreatment and calcium chloride addition | Zendy

Yali Liu | Zendy; Xiaorong Kang | Zendy; Xin Li | Zendy; Zheng Wang | Zendy; Zhao Jing | Zendy

Open Access

Performance and mechanism of sludge dewaterability enhanced by potassium ferrate pretreatment and calcium chloride addition

Author(s) -

Yali Liu,

Xiaorong Kang,

Xin Li,

Zheng Wang,

Zhao Jing

Publication year - 2016

Publication title -

journal of water reuse and desalination

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.548

H-Index - 16

eISSN - 2408-9370

pISSN - 2220-1319

DOI - 10.2166/wrd.2016.147

Subject(s) - chemistry , extracellular polymeric substance , potassium ferrate , calcium , potassium , chloride , agglomerate , fluorescence spectroscopy , chemical engineering , nuclear chemistry , inorganic chemistry , fluorescence , organic chemistry , biofilm , biology , bacteria , engineering , genetics , physics , quantum mechanics

The potential benefits and mechanisms of potassium ferrate pretreatment and calcium chloride addition on sludge dewaterability were investigated in this study. The capillary suction time (CST) was used to evaluate sludge dewaterability. Results indicated that potassium ferrate of 0.1 g/g total solids (TS) and calcium chloride of 0.4 g/g TS were optimal parameters, and corresponding CST reached 43.7 s. Soluble organics in extracellular polymeric substances (EPS) were determined by three-dimensional excitation-emission matrix fluorescence spectroscopy, which was used to explain the mechanism of sludge dewaterability. The fluorescence intensities of protein-like and humic-like substances in EPS had a negative relationship with the CST. Scanning electron microscopy images indicated that calcium chloride neutralized the surface charge of particles, making the soluble protein-like substances agglomerate and form bigger flocs, consequently enhancing sludge dewaterability.

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