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Improving the Dewaterability of Sewage Sludge Using Rice Husk and Fe2+-Sodium Persulfate Oxidation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-11-29 00:00:00 , DOI: 10.1021/acssuschemeng.7b03227 Qiao Xiong , Min Zhou , Hong Yang 1 , Mengjia Liu , Teng Wang , Yiqie Dong , Haobo Hou
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-11-29 00:00:00 , DOI: 10.1021/acssuschemeng.7b03227 Qiao Xiong , Min Zhou , Hong Yang 1 , Mengjia Liu , Teng Wang , Yiqie Dong , Haobo Hou
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Physical conditioners or skeleton builders are usually used to improve the dewaterability of sewage sludge. In this study, low-cost rice husk (RH) was evaluated as an alternative skeleton builder and combined with Fe2+ and sodium persulfate (SPS) for sewage sludge conditioning. The results show that the sewage sludge conditioned with RH and Fe2+/SPS showed good dewaterability, and the capillary suction time was reduced by 92.8% under optimal conditions. With use of response surface methodology, the optimal composite conditioner concentrations were 151.5 mg/g dry solid (DS) of SPS, 46 mg/g DS of Fe2+, and 333 mg/g DS of RH. After the sludge was conditioned with Fe2+/SPS, some extracellular polymeric substances (EPS) were destroyed, which resulted in the dissolved protein and polysaccharide amounts in the filtrate increasing. The water content analysis indicated the bound water was converted to free water because of the EPS degradation. The particle size analysis showed that the sludge flocs became smaller. After the addition of RH, the sludge formed a stratified, porous structure that improved the sludge compressibility and provided outflow passages for free water, which enhanced the sludge dewaterability. These results indicated that combining persulfate oxidation with RH conditioning is a promising strategy to improve sludge dewaterability.
中文翻译：
利用稻壳和Fe 2 + -过硫酸钠氧化提高污水污泥的脱水性
通常使用物理调节剂或骨架助剂来改善污水污泥的脱水性。在这项研究中，低成本稻壳（RH）被评估为替代骨架构建物，并与Fe 2+和过硫酸钠（SPS）结合用于污水污泥调节。结果表明，在RH和Fe 2+ / SPS条件下处理的污泥具有良好的脱水性能，在最佳条件下，毛细管抽吸时间减少了92.8％。使用响应表面方法，最佳的复合调理剂浓度为151.5 mg / g SPS的干燥固体（DS），46 mg / g DS 2的Fe 2+和333 mg / g DS的RH。用Fe 2+调节污泥后/ SPS破坏了一些细胞外聚合物（EPS），导致滤液中溶解的蛋白质和多糖含量增加。含水量分析表明，由于EPS降解，结合水转化为游离水。粒度分析表明污泥絮凝物变小。添加RH后，污泥形成分层的多孔结构，改善了污泥的可压缩性，并提供了自由水的流出通道，从而增强了污泥的脱水性。这些结果表明，过硫酸盐氧化与RH调节相结合是提高污泥脱水能力的一种有前途的策略。
更新日期：2017-11-29
中文翻译：
利用稻壳和Fe 2 + -过硫酸钠氧化提高污水污泥的脱水性
通常使用物理调节剂或骨架助剂来改善污水污泥的脱水性。在这项研究中，低成本稻壳（RH）被评估为替代骨架构建物，并与Fe 2+和过硫酸钠（SPS）结合用于污水污泥调节。结果表明，在RH和Fe 2+ / SPS条件下处理的污泥具有良好的脱水性能，在最佳条件下，毛细管抽吸时间减少了92.8％。使用响应表面方法，最佳的复合调理剂浓度为151.5 mg / g SPS的干燥固体（DS），46 mg / g DS 2的Fe 2+和333 mg / g DS的RH。用Fe 2+调节污泥后/ SPS破坏了一些细胞外聚合物（EPS），导致滤液中溶解的蛋白质和多糖含量增加。含水量分析表明，由于EPS降解，结合水转化为游离水。粒度分析表明污泥絮凝物变小。添加RH后，污泥形成分层的多孔结构，改善了污泥的可压缩性，并提供了自由水的流出通道，从而增强了污泥的脱水性。这些结果表明，过硫酸盐氧化与RH调节相结合是提高污泥脱水能力的一种有前途的策略。
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