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Enhanced waste activated sludge dewaterability by the ozone-peroxymonosulfate oxidation process: Performance, sludge characteristics, and implication
Science of the Total Environment ( IF 9.8 ) Pub Date : 2021-10-15 , DOI: 10.1016/j.scitotenv.2021.151025
Lu Bai 1 , Guanjun Wang 1 , Dongdong Ge 1 , Yanting Dong 1 , Hui Wang 1 , Yuhui Wang 1 , Nanwen Zhu 1 , Haiping Yuan 1
Affiliation  

Dewatering treatment is an essential step to diminish sludge volume, cut down transportation costs, and improve subsequent disposal efficiency. In this study, ozone-peroxymonosulfate (O3/PMS) oxidation process was employed to ameliorate sludge dewaterability. Sludge capillary suction time (CST) and water content (Wc) of dewatered sludge cake could reduce from 70.5 s and 81.93% to 26.7 s and 65.65%, respectively, under the optimal dosage of 30 mg/g TS O3 and 0.4 mmol/g TS PMS. The increased sludge zeta potential, particle size, and fluidity promoted sludge dewatering performance apparently. The decreased hydrophilic, fluorescent EPS components and proteins/peptides-like + Lipids percentage in EPS as well as the ratio of α-helix/(β-sheet + random coil) of treated EPS protein secondary structure was greatly responsible for the enhanced sludge dewaterability. SO4radical dot and radical dotOH were detected in ozone-peroxymonosulfate process to crack sludge flocs, eliminate hydrophilic substances and liberate bound water. Moreover, the concentrations of both heavy metals and polycyclic aromatic hydrocarbons (PAHs) of sludge after O3/PMS conditioning were decreased, and the stability and toxicity of heavy metals were also reduced, except Zn. In conclusion, this work offered a comprehensive insight based on ozone-peroxymonosulfate (O3/PMS) advanced oxidation for improving the sludge dewaterability and environmental implication.



中文翻译:

通过臭氧-过硫酸盐氧化工艺提高废弃活性污泥的脱水能力:性能、污泥特性和意义

脱水处理是减少污泥体积、降低运输成本、提高后续处理效率的重要步骤。在这项研究中,臭氧-过一硫酸盐(O 3 /PMS)氧化过程被用来改善污泥的脱水能力。在30 mg/g TS O 3的最佳投加量下,脱水污泥饼的污泥毛细管抽吸时间(CST)和含水率(Wc)分别从70.5 s和81.93%降低到26.7 s和65.65%和 0.4 mmol/g TS PMS。增加的污泥zeta电位、粒径和流动性明显提高了污泥脱水性能。EPS中亲水性、荧光性EPS成分和蛋白质/类肽+脂质百分比的降低以及处理过的EPS蛋白质二级结构的α-螺旋/(β-折叠+无规卷曲)比例是提高污泥脱水能力的主要原因. SO 4 根点-根点OH在臭氧-过一硫酸盐工艺中被检测到以裂解污泥絮凝物,去除亲水性物质并释放结合水。此外,O 3后污泥中重金属和多环芳烃 (PAHs) 的浓度/PMS 调节降低,除 Zn 外,重金属的稳定性和毒性也降低。总之,这项工作提供了基于臭氧-过氧单硫酸盐 (O 3 /PMS) 高级氧化的综合见解,以改善污泥的脱水能力和环境影响。

更新日期:2021-10-17
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