脱水
过硫酸盐
活性污泥
污水污泥
化学
胞外聚合物
污水处理
污水污泥处理
污水
废物管理
化学工程
环境科学
环境化学
环境工程
有机化学
岩土工程
催化作用
地质学
工程类
古生物学
细菌
生物膜
作者
Liangliang Wei,Xinhui Xia,Fengyi Zhu,Qiaoyang Li,Mao Xue,LI Jian-ju,Bo Sun,Junqiu Jiang,Qingliang Zhao
出处
期刊:Water Research
[Elsevier]
日期:2020-05-16
卷期号:181: 115903-115903
被引量:112
标识
DOI:10.1016/j.watres.2020.115903
摘要
To clarify the effect of the hydrophobic/hydrophilic polarity of extracellular polymeric substances (EPS) on sludge filterability improvement during S2O82-/Fe2+ oxidation, waste activated sludge (WAS), glucose-fed hydrophilic sludge (HPI-WAS), and sodium acetate-fed hydrophobic sludge (HPO-WAS) samples were cultivated, and their dewatering behaviors were individually explored. Experimental results showed that S2O82- oxidation effectively disintegrated the polymeric EPS and led to a more significant reduction in the water content for HPO-WAS than for HPI-WAS (12.87–15.23% vs 9.31–12.12%), especially regarding the bound water (Wb) content. After oxidation, as high as 38.88–42.61% of the Wb within HPO-WAS samples were declined, much higher than the HPI-WAS samples (19.27–29.20%). Specifically, carbohydrates within sludge EPS negatively influenced the dewatering process of S2O82-/Fe2+ oxidation. By contrast, abundant existence of humic acids and polymeric proteinaceous components (especially those hydrophilic proteins and transitional humic acids) within the sludge EPS exhibited a converse trend. FT-IR and EEM spectral, as well as particle sizes variation for the sludge samples before and after S2O82-/Fe2+ oxidation was also evaluated. This study provides new insight into the enhancement of S2O82-/Fe2+ oxidation for sludge dewatering based on polarity analysis of EPS.
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