JINRun,LIXiang,TANXin-wei,et al.Performance of Potassium Ferrate for Excess Sludge Oxidation and Property of Cracking Solution[J].China Water & Wastewater,2023,39(17):118-123.
Performance of Potassium Ferrate for Excess Sludge Oxidation and Property of Cracking Solution
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
118-123
Column:
Date of publication:
2023-09-01
- Keywords:
- potassium ferrate; sludge cracking; excess sludge; oxidation; extracellular polymeric substances
- Abstract:
- This paper investigated the effect of potassium ferrate dosage on the oxidation performance of excess sludge solids and the water quality characteristics of the cracked solution after oxidation from the aspects of sludge solid oxidation degree (VSS, SV, SVI and median particle size), sludge dewatering performance (sludge specific resistance) and concentration of various substances in the liquid phase after cracking (TOC, SCOD, NH4+-N, TN, PO43--P, TP, polysaccharide and protein). With the increase of potassium ferrate dosage, the volatile suspended solids decreased gradually, the median particle size decreased slightly at first and then increased, the specific resistance of sludge increased sharply and then decreased, and the settling velocity of sludge did not change significantly. The TOC, SCOD, TN, PO43--P, TP and concentrations of polysaccharide and protein all showed a trend of rapid rise followed by slow rise. When the dosage was 30 mg/gSS (calculated as Fe), the concentrations of the above indexes after oxidation were 838 mg/L, 2 153 mg/L, 134 mg/L, 22 mg/L, 29 mg/L, 156 mg/L and 514 mg/L, respectively, the degree of sludge disintegration was 16%, and the cell lysis ratio was 0.16. At this dosage, the excess sludge could be oxidized and cracked more economically.
Last Update:
2023-09-01