Innovative combination of electrolysis and Fe(II)-activated persulfate oxidation for improving the dewaterability of waste activated sludge.
Innovative combination of electrolysis and Fe(II)-activated persulfate oxidation for improving the dewaterability of waste activated sludge.
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DOI：
10.1016/j.biortech.2013.03.007
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发表时间：
2013-05
影响因子：
11.4
通讯作者：
Guangyin Zhen;Xueqin Lu;Y. Li;Youcai Zhao
中科院分区：
文献类型：
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作者：
Guangyin Zhen;Xueqin Lu;Y. Li;Youcai Zhao
研究了电解结合Fe（II）活化过硫酸盐（S2 O 82-）氧化提高废弃活性污泥（WAS）脱水性能的可行性。研究了污泥的物理化学性质（污泥体积（SV）、总悬浮固体（TSS）和挥发性悬浮固体（VSS））和胞外聚合物（EPS），包括黏质EPS、松散结合EPS（LB-EPS）和紧密结合EPS（TB-EPS），以确定它们在污泥脱水中的确切作用。脱水性与LB EPS、TB EPS、蛋白质（PN）和多糖（PS）呈负相关，与SV、TSS、VSS、粘液EPS和PN/PS无关。通过扫描电子显微镜（SEM）的进一步研究验证了TB-EPS对细菌细胞的截留，保护它们免受电解破坏。相比之下，电解结合S2 O 82-/Fe（II）氧化能够有效地破坏保护屏障并使截留的细胞破裂，释放EPS和细胞内的水。因此，TB-EPS和细胞的破坏是脱水性增强的根本原因。
The feasibility of electrolysis integrated with Fe(II)-activated persulfate (S2O82-) oxidation to improve waste activated sludge (WAS) dewaterability was evaluated. The physicochemical properties (sludge volume (SV), total suspended solids (TSS) and volatile suspended solids (VSS)) and extracellular polymeric substances (EPS), including slime EPS, loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) were characterized to identify their exact roles in sludge dewatering. While dewaterability negatively corresponded to LB-EPS, TB-EPS, protein (PN) and polysaccharide (PS) in LB-EPS and TB-EPS, it was independent of SV, TSS, VSS, slime EPS and PN/PS. Further study through scanning electron microscope (SEM) verified the entrapment of bacterial cells by TB-EPS, protecting them against electrolysis disruption. Comparatively, electrolysis integrated with S2O82-/Fe(II) oxidation was able to effectively disrupt the protective barrier and crack the entrapped cells, releasing the water inside EPS and cells. Therefore, the destruction of both TB-EPS and cells is the fundamental reason for the enhanced dewaterability.