New insight on the combined effects of hydrothermal treatment and FeSO4/Ca(ClO)2 oxidation for sludge dewaterability improvement: From experimental to theoretical investigation

被引：29

作者：

Chen, Dandan ^{[1
,2
,3
]}

Dou, Yuhao ^{[1
]}

Tang, Qin ^{[1
]}

Huang, Yaji ^{[2
]}

Song, Min ^{[2
]}

Zhou, Jun ^{[3
]}

Fu, Lichun ^{[4
,5
]}

机构：

[1] Nanjing Normal Univ, Sch Energy & Mech Engn, Engn Lab Energy Syst Proc Convers & Emiss Control, Nanjing 210042, Jiangsu, Peoples R China

[2] Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China

[3] China Construct Power & Environm Engn Co LTD, Nanjing 210017, Jiangsu, Peoples R China

[4] Nanjing Univ, Yancheng 224001, Peoples R China

[5] Yancheng Acad Environm Protect Technol & Engn, Yancheng 224001, Peoples R China

来源：

FUEL PROCESSING TECHNOLOGY | 2020年 / 197卷

基金：

中国博士后科学基金;

关键词：

Sludge dewatering; Extracellular polymeric substances (EPS); Hydrothermal treatment; FeSO4/Ca(ClO)(2) oxidation; DFT calculation; EXTRACELLULAR POLYMERIC SUBSTANCES; OXYGEN-FUNCTIONAL-GROUPS; WASTE ACTIVATED-SLUDGE; FENTON-LIKE PROCESS; SEWAGE-SLUDGE; ENHANCED DEWATERABILITY; ORGANIC-COMPOUNDS; WATER SLUDGE; BOND ORDER; FLY-ASH;

D O I：

10.1016/j.fuproc.2019.106196

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A combination of hydrothermal treatment and FeSO4/Ca(ClO)(2) oxidation was developed to enhance the dewatering performance of sludge. First, capillary suction time (CST), specific resistance to filterability (SRF), and water content (Wc) are used to evaluate the sludge dewaterability. The effect of the hydrothermal temperature, the concentration and the molar ratio of FeSO4 and Ca(ClO)(2) on the sludge dewatering performance was examined to determine the optimal conditions. Furthermore, the mechanism of the degradation of EPS in sludge was studied using density functional theory (DFT), e.g., electrostatic potential (ESP) analysis, bond order analysis, and bond dissociation enthalpy (BDE) analysis. The results show that the sludge dewaterability was significantly improved with the combined method. The floc structure and the oxygen-containing groups of EPS in sludge are the key reasons for its hydrophilicity and high water content. The combined method can enhance sludge dewatering by breaking the floc structure and removing oxygen functional groups, which is a promising technology for sludge dewatering.

引用

页数：12

共 59 条

[1]

ALSOP GM, 1982, J WATER POLLUT CON F, V54, P146

[2]

[Anonymous], 2008, ENV SANITATION ENG

[3]

[Anonymous], THEORETICAL MECH INV

[4] C-H and N-H bond dissociation energies of small aromatic hydrocarbons [J].