Dewatering efficiency of sewage sludge during Fe2+-activated persulfate oxidation: Effect of hydrophobic hydrophilic properties of sludge EPS
Dewatering efficiency of sewage sludge during Fe2+-activated persulfate oxidation: Effect of hydrophobic hydrophilic properties of sludge EPS
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Fe2+激活过硫酸盐氧化过程中污水污泥的脱水效率：污泥EPS疏水亲水特性的影响
DOI：
10.1016/j.watres.2020.115903
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发表时间：
2020
期刊：
影响因子：
12.8
通讯作者：
Zhao Qingliang
中科院分区：
文献类型：
--
作者：
Wei Liangliang;Xia Xinhui;Zhu Fengyi;Li Qiaoyang;Xue Mao;Li Jianju;Sun Bo;Jiang Junqiu;Zhao Qingliang
为了阐明S2 O 82-/Fe 2+氧化过程中胞外聚合物（EPS）的疏水/亲水极性对污泥过滤性能改善的影响，培养了废活性污泥（WAS）、葡萄糖进料的亲水污泥（HPI-WAS）和乙酸钠进料的疏水污泥（HPO-WAS）样品，并分别考察了它们的脱水行为。实验结果表明，S2 O 82-氧化有效地分解了聚合物EPS，并且导致HPO-WAS的水含量比HPI-WAS更显著地降低（12.87- 15.23%对9.31 -12.12%），特别是关于结合水（Wb）含量。氧化后，HPO-WAS样品中的Wb下降了38.88-42.61%，远高于HPI-WAS样品（19.27-29.20%）。污泥EPS中的碳水化合物对S2 O 82-/Fe 2+氧化脱水过程有负面影响。与此相反，大量存在的腐殖酸和聚合蛋白质组分（特别是那些亲水性蛋白质和过渡腐殖酸）的污泥EPS表现出匡威的趋势。对S2 O 82-/Fe 2+氧化前后污泥样品的FT-IR和EEM光谱以及粒径变化进行了评价。该研究为基于EPS极性分析的S2 O 82-/Fe 2+氧化强化污泥脱水提供了新的视角。
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%vs9.31–12.12%), especially regarding the bound water (Wb) content. After oxidation, as high as 38.88–42.61% of theWbwithin 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.