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+/S2O2-8 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+/S2O2-8composite CaO reaction system compared with Fenton, CPAM, and SO-4 methods and the optimal parameters for dosage were as follows: Fe2+/S2O2-8: 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.
References
[1]
Lu, J.Y., Wang, X.M., Liu, H.Q., Yu, H.-Q. and Li, W.-W. (2019) Optimizing Operation of Municipal Wastewater Treatment Plants in China: The Remaining Barriers and Future Implications. Environment International, 129, 273-278. https://doi.org/10.1016/j.envint.2019.05.057
[2]
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration of the People’s Republic of China (2009) Disposal of Sludge from Municipal Wastewater Treatment Plant—Quality of Sludge for Co-Landfilling. GB/T 23485-2009, Standards Press of China, Beijing.
[3]
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration of the People’s Republic of China (2009) Disposal of Sludge from Municipal Wastewater Treatment Plant—Quality of Sludge in Separate Incineration. GB/T 24602-2009, Standards Press of China, Beijing.
[4]
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration of the People’s Republic of China (2009) Disposal of Sludge from Municipal Wastewater Treatment Plant—Quality of Sludge Used in Making Brick. GB/T 23485-2009, Standards Press of China, Beijing.
[5]
Chen, C.Y. (2013) Effectiveness and Mechanisms of Sewage Sludge Conditioning with Chitosan and Modified Coal Fly Ash. Hunan University, Changsha.
[6]
Xiao, P.F. and Jiang, S.J. (2018) Research Progress in Remediation of Organic Contaminated Soil by Activated Persulfate Oxidation. Chemical Industry and Engineering Progress, 37, 4862-4873.
[7]
Zhen, G.Y., Lu, X.Q., Wang, B.Y., Zhao, Y.C., Chai, X.L., Niu, D.J., et al. (2012) Synergetic Pretreatment of Waste Activated Sludge by Fe(II)-Activated Persulfate Oxidation under Mild Temperature for Enhanced Dewaterability. Bioresource Technology, 124, 29-36. https://doi.org/10.1016/j.biortech.2012.08.039
[8]
Liu, J., Yang, Q., Wang, D.B., Li, X.M., Zhong, Y., Li, X., et al. (2016) Enhanced Dewaterability of Waste Activated Sludge by Fe(II)-Activated Peroxymonosulfate Oxidation. Bioresource Technology, 206, 134-140. https://doi.org/10.1016/j.biortech.2016.01.088
[9]
Wei, H., Gao, B.Q., Ren, J., Li, A. and Yang, H. (2018) Coagulation/Flocculation in Dewatering of Sludge: A Review. Water Research, 143, 608-631. https://doi.org/10.1016/j.watres.2018.07.029
[10]
Yang, B., Yang, J.K., Tang, Y., Xie, Y.Z. and Xiao, B (2007) Impact of Fly Ash and Powered Lime on Dewatering Performance of Sludge. Environmental Science & Technology, 30, 98-99. http://dx.chinadoi.cn/10.3969/j.issn.1003-6504.2007.04.035
[11]
Shi, Y.F., Yang, J.K., Yu, W.B., Zhang, S.N., Liang, S., Song, J., et al. (2015) Synergetic Conditioning of Sewage Sludge via Fe2+/Persulfate and Skeleton Builder: Effect on Sludge Characteristics and Dewaterability. Chemical Engineering Journal, 270, 572-581. https://doi.org/10.1016/j.cej.2015.01.122
[12]
Li, Y.L., Liu, L., Li, L.L., et al. (2016) Coordination of Activated Persulfate Oxidation Combined with Skeleton Builder Process for Sewage Sludge Deep-Dewatering. Environmental Engineering, 34, 102-107.
[13]
Xu, X. (2013) Research on the Application of Persulfate and Alkyl Glycoside in Sludge Conditioning and Dewatering Mechanism. Huazhong University of Science and Technology, Wuhan.
[14]
Zhen, G.Y., Lu, X.Q., Zhao, Y.C., Chai, X.L. and Niu, D.J. (2012) Enhanced Dewaterability of Sewage Sludge in the Presence of Fe(II)-Activated Persulfate Oxidation. Bioresource Technology, 116, 259-265. https://doi.org/10.1016/j.biortech.2012.01.170
[15]
Rastogi, A., Al-Abed, S.R. and Dionysios, D.D. (2008) Sulfate Radical-Based Ferrous-Peroxymonosulfate Oxidative System for PCBs Degradation in Aqueous and Sediment Systems. Applied Catalysis B: Environmental, 85, 171-191. https://doi.org/10.1016/j.apcatb.2008.07.010
[16]
Xu, W.D., Chang, S., Ming, T.S., et al. (2018) Pretreatment Technology of Sewage of Sludge with Sulfate Radical (SO-4). Chinese Journal of Environmental Engineering, 12, 1528-1535.
[17]
Liang, C.J., Bruell, C.J., Marley, M.C., et al. (2004) Persulfate Oxidation for in Situ Remediation of TCE. I. Activated by Ferrous Ion with and without a Persulfate-Thiosulfate Redox Couple. Chemosphere, 55, 1213-1223.
[18]
Liang, J.L. (2006) Influence of Fenton Oxidation and Quicklime on Deeply Dewatering Performance of Five Sewage Sludge. Guangdong University of Technology, Guangdong.
[19]
Li, C.J. (2009) Investigation of Removal of Contaminants in Water by Fenton and Fenton-Like Oxidation. Harbin Institute of Technology, Harbin.
[20]
Liang, C.J. and Su, H.W. (2009) Identification of Sulfate and Hydroxyl Radicals in Thermally Activated Persulfate. Industrial & Engineering Chemistry, 48, 5558-5562. https://doi.org/10.1021/ie9002848
[21]
Li, Y.L., Yang, J.K., Yang, C.Z., et al. (2013) Study on Durability of Landfill Disposal of Dewatered Sludge Conditioned by Composites Based on Skeleton Builder. Journal of Huazhong University of Science and Technology (Nature Science), 41, 76-80.
[22]
Liu, P., Liu, H., Yao, H., et al. (2013) Influence of Fenton’s Reagent and Skeleton Builders on Sludge Dewatering Performance. Environmental Science & Technology, 36, 146-151.
[23]
Liu, L.R., Luo, Y.Q., Peng, L.S., Gong, L.F., Ma, Y.H., Ye, T.J., et al. (2014) Study on Screening and Optimization of Municipal Sludge Deep Dewatering Conditioners. Environmental Engineering, 32, 65-69+77.
[24]
Neyens, E. and Baeyens, J. (2003) A Review of Classic Fenton’s Peroxidation as an Advanced Oxidation Technique. Journal of Hazardous Materials, 98, 33-50. https://doi.org/10.1016/S0304-3894(02)00282-0
[25]
Guo, J.Y., Gao, Q.F. and Jiang, S.L. (2020) Insight into Dewatering Behavior and Heavy Metals Transformation during Waste Activated Sludge Treatment by Thermally-Activated Sodium Persulfate Oxidation Combined with a Skeleton Builder-Wheat Straw Biochar. Chemosphere, 252, Article ID: 126542. https://doi.org/10.1016/j.chemosphere.2020.126542
[26]
Zhou, Y., Zhang, A.J., Zhang, P.Y., et al. (2011) Sewage Sludge Disintegration and Dewaterability Improvement by Photo-Fenton Oxidation. Chinese Journal of Environmental Engineering, 5, 2600-2604.
[27]
Pan, S., Huang, G.T., Tan, X.J. and Sun, X. (2012) Improvement of Excess Sludge Dewatering Performance with Fenton Reagent. Water Purification Technology, 31, 26-31+35. http://dx.chinadoi.cn/10.3969/j.issn.1009-0177.2012.03.007
[28]
Zhou, X., Wang, Q.L., Jiang, G.M., Liu, P. and Yuan, Z.G. (2015) A Novel Conditioning Process for Enhancing Dewaterability of Waste Activated Sludge by Combination of Zero-Valent Iron and Persulfate. Bioresource Technology, 185, 416-420. https://doi.org/10.1016/j.biortech.2015.02.088
[29]
Xie, X.Q., Huang, Z.Y., Dai, L.H., Xie, X.M. and Liu, M.L. (2010) Study on Deep Dewatering and Recycling of Municipal Sludge in Xiamen. China Water & Wastewater, 26, 138-140.
[30]
Yang, X.Y., Liu, Y.Y., Zhang, W., et al. (2014) Laboratory and Pilot Studies on Sludge Dewatering in the Ninth Beijing Drinking Water Treatment Plant. Environment Engineering, 32, 20-24.
