Author(s)

Zezheng Dong¹, Yong Wang², Min Yue³, Ping Zhang⁴, Jingcai Chang^1*

¹School of Environmental Science and Engineering, Shandong University, Qingdao, China.
²Qingdao Daneng Environmental Protection Equipment Co., Ltd., Qingdao, China.
³Editorial Department of “Journal of Shandong University” (Philosophy and Social Science), Jinan, China.
⁴Shandong Urban Construction Vocational College, Jinan, China.

For the problem as high energy consumption and sludge increment during the municipal sludge management process with advanced oxidation technology of sulfate radical, the Fe²⁺/S₂O^2-₈ composite CaO reaction system was set up. Meanwhile, systematical studies had been carried out for coordinated conditioning of municipal concentrated sludge. The scientific process parameters were determined with the help of sludge capillary suction time, sewage sludge moisture content and other core indicators and the effect of traditional polyacrylamide flocculation method, Fenton method and activated persulfate method were compared. The results showed that in the neutral concentrated sludge conditioning, there were outstanding advantages for Fe²⁺/S₂O^2-₈ composite CaO reaction system compared with Fenton, CPAM, and SO^-₄ methods and the optimal parameters for dosage were as follows: Fe²⁺/S₂O^2-₈: 80 - 120 mg·g^-1 DS, n(Fe2+):n(SPS) = 0.8:1, CaO: 200 mg·g^-1 DS. To achieve similar performance index, the dosage of Fe²⁺ per ton for sludge could be reduced by 20%, the loss rate for iron in filtrate was 0.5%, dewatering of sludge by suction filtration was within 50 s and the moisture content for dewatering cake was 53.7%, which significantly improved the economy and practicability of SO^-₄ advanced oxidation technology, and the results were expected to form a useful supplement to the popularization and application of SO^-₄ advanced oxidation technology.

Sludge Conditioning, Fe²⁺, Persulfate, Quicklime, Economy, Municipal Sludge

Dong, Z. , Wang, Y. , Yue, M. , Zhang, P. and Chang, J. (2021) Research on Characteristic of Fe²⁺/S₂O^2-₈ Composite CaO Synergetic Conditioning for Municipal Sludge. Journal of Environmental Protection, 12, 13-28. doi: 10.4236/jep.2021.121002.