Improvement of sludge dewatering by calcium peroxide activated with pyrite: performances, mechanisms and implications†

IF 3.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Environmental Science: Water Research & Technology Pub Date : 2025-04-03 DOI:10.1039/D4EW00915K

Jinyun Chen, Xiaoshuang Liu, Ziheng Dai, Lei Liu, Yuhan Fan, Weiqi Liu and Liguo Zhang

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引用次数: 0

Abstract

This study proposed a novel sludge conditioning technology using calcium peroxide (CaO₂) activated with pyrite for improving the dewaterability of waste activated sludge (WAS). The results showed that the water content of the sludge cake decreased from 93.33% to 90.80%, and the SCST decreased to 0.52 at the optimal conditioning (pyrite dose of 32.61 mg g_TS⁻¹, CaO₂ dose of 30 mg g_TS⁻¹). Furthermore, a comprehensive investigation indicated that the underlying mechanism of dewaterability improvement can be attributed to the transformations of extracellular polymeric substances (EPS). The results of the FTIR protein secondary structure and interfacial free energy showed that combined conditioning enhanced the hydrophobicity of the sludge. In addition, the repulsive force of sludge particles and the bound water content in sludge flocs both decreased after conditioning based on the results of zeta potential and potential barriers. Overall, these findings provided theoretical insights into the role of EPS in dewaterability improvement and an alternative sludge conditioning scheme.

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黄铁矿活化过氧化钙改善污泥脱水：性能、机理及意义

提出了一种利用黄铁矿活化过氧化钙（CaO2）提高废活性污泥（WAS）脱水性能的污泥处理新技术。结果表明：在最佳条件下（黄铁矿用量为32.61 mg gTS−1，cao用量为30 mg gTS−1），污泥饼含水率由93.33%降至90.80%，SCST降至0.52；此外，一项综合研究表明，脱水能力改善的潜在机制可能归因于细胞外聚合物（EPS）的转化。FTIR蛋白二级结构和界面自由能结果表明，复合调理增强了污泥的疏水性。此外，根据zeta电位和势垒的结果，调节后污泥颗粒的排斥力和污泥絮凝体中的束缚水含量均降低。总的来说，这些发现为EPS在改善脱水性和替代污泥调节方案中的作用提供了理论见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES

CiteScore

8.60

自引率

4.00%

发文量

206

期刊介绍： Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.