过氧乙酸破解和化学重絮凝改善活性污泥过滤脱水性能

发布时间：2018-04-14 06:16

本文选题：污泥 + 过氧乙酸　；参考：《哈尔滨工业大学学报》2016年02期

【摘要】：活性污泥中的胞外聚合物(EPS)高度亲水,破坏EPS结构是促使结合水释放的必要过程.为此,研究利用过氧乙酸(PAA)预氧化破解污泥和化学絮凝过程以同步实现污泥减量和脱水性改善,深入解析组合调理过程中污泥絮体形态特征及EPS分布和组成的变化特征.结果表明:PAA处理污泥对其过滤特性影响不大,但有效降低滤后泥饼的含水率;PAA能够有效破解污泥,破坏EPS中蛋白质类有机物,促使结合水释放;随着p H的降低,PAA对污泥脱水性的改善效果更佳,这主要是因为酸性环境有效提高了PAA对污泥EPS的氧化效率;高剂量PAA处理污泥后未见到有完整结构的絮体.投加聚合氯化铝(PAC)和氯化铁后,污泥絮体重新形成,同时污泥更容易过滤且脱水性随之提高.由于具有更强的吸附架桥能力,PAC在改善脱水性方面的效果优于氯化铁.
[Abstract]:EPS, an extracellular polymer in activated sludge, is highly hydrophilic, and the destruction of EPS structure is a necessary process to promote the release of binding water.In order to realize the improvement of sludge dewatering and dewatering simultaneously, the sludge pre-oxidation and chemical flocculation process were used to analyze the morphological characteristics of sludge floc and the variation characteristics of EPS distribution and composition in the combined conditioning process.The results showed that the sludge treated with 1: PAA had little effect on the filtration characteristics, but reducing the moisture content of the cake could effectively crack the sludge, destroy the protein organic matter in EPS, and promote the release of binding water.With the decrease of pH, the sludge dewatering was improved better, which was mainly due to the fact that the oxidation efficiency of PAA to sludge EPS was improved effectively in acidic environment, and the floc with complete structure was not found after high dose PAA treatment.After adding polyaluminum chloride (PAC) and ferric chloride, the sludge floc was formed again, and the sludge was more easily filtered and dehydrated.PAC is superior to ferric chloride in improving dehydration because of its stronger adsorption and bridging ability.
【作者单位】：西安建筑科技大学市政与环境工程学院;中国地质大学(武汉)环境学院;中国科学院生态环境研究中心环境水质学国家重点实验室;
【基金】：国家自然科学基金(51178360;51338010)
【分类号】：X703

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