Enhancing waste activated sludge dewaterability by reducing interaction energy of sludge flocs

被引:40
作者
Yu, Wenbo [1 ,2 ]
Wan, Yanlei [3 ]
Wang, Yu [1 ,2 ]
Zhu, Yuwei [1 ,2 ]
Tao, Shuangyi [1 ,2 ]
Xu, Qi [1 ,2 ,3 ]
Xiao, Keke [1 ,2 ]
Liang, Sha [1 ,2 ]
Liu, Bingchuan [1 ,2 ]
Hou, Huijie [1 ,2 ]
Hu, Jingping [1 ,2 ]
Yang, Jiakuan [1 ,2 ,4 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Hubei, Peoples R China
[2] Hubei Prov Engn Lab Solid Waste Treatment Disposa, Wuhan 430074, Hubei, Peoples R China
[3] Changjiang Inst Survey Planning Design & Res, Wuhan 430010, Hubei, Peoples R China
[4] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Waste activated sludge; Dewaterability; Extended DLVO theory; Energy barrier; Cations; EXTRACELLULAR POLYMERIC SUBSTANCES; SEWAGE-SLUDGE; FENTONS REAGENT; EPS; OXIDATION; FLOCCULATION; FILTRATION; INSIGHTS; PROTEIN; IRON;
D O I
10.1016/j.envres.2020.110328
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
How to efficiently improve waste activated sludge (WAS) dewaterability is a common challenge in WAS treatment and management throughout world. The interaction energy of sludge flocs is of great importance for sludge dewaterability. In this study, the relationship among the repulsive force of sludge flocs, hydrophilic/hydrophobic characteristics of sludge flocs, and sludge dewaterability have been quantitatively and qualitatively investigated based on extended Derjaguin?Landau?Verwey?Overbeek theory for the first time. The energy barrier of sludge flocs has good correlations with sludge dewaterability (p < 0.05). Trivalent cations (Al3+ and Fe3+) and Fenton?s reagent reduced the interfacial free energy (?G) from 9.4 mJ/m2 of raw sludge to -34.2 (Al3+), -60.5 (Fe3+), and -63.2 (Fenton) mJ/m2, respectively, indicating that the hydrophilic surfaces of the sludge flocs converted to hydrophobic (?G < 0), and decreasing Lewis acid?base interaction energy (WAB) of sludge flocs. In addition, most of the trivalent cations (Al3+ and Fe3+) were attached to sludge flocs, leading to neutralize negative charges and mitigate electrostatic interaction energy (WR) of sludge flocs. The reduction of WAB and WR eliminated energy barrier of sludge flocs and repulsive force between sludge flocs. In comparison, monovalent (Na+ and K+) and bivalent (Ca2+ and Mn2+) cations cannot completely change the hydrophilic surface characteristic and negative charge of sludge flocs. The existed energy barrier prevented sludge flocs to agglomerate with each other, thus resulting in a worse dewaterability. This study illustrated that reducing interaction energy of sludge flocs played a critical role to improve sludge dewaterability.
引用
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页数:9
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