title: Effects of surfactants on the improvement of sludge dewaterability using cationic flocculants.
abstract: The effects of the cationic surfactant (cationic cetyl trimethyl ammonium bromide, CTAB) on the improvement of the sludge dewaterability using the cationic flocculant (cationic polyacrylamide, CPAM) were analyzed. Residual turbidity of supernatant, dry solid (DS) content, extracellular polymeric substances (EPS), specific resistance to filtration (SRF), zeta potential, floc size, and settling rate were investigated, respectively. The result showed that the CTAB positively affected the sludge conditioning and dewatering. Compared to not using surfactant, the DS and the settling rate increased by 8%-21.2% and 9.2%-15.1%, respectively, at 40 mg·L-1 CPAM, 10×10-3 mg·L-1 CTAB, and pH 3. The residual turbidities of the supernatant and SRF were reduced by 14.6%-31.1% and 6.9%-7.8% compared with turbidities and SRF without surfactant. Furthermore, the release of sludge EPS, the increases in size of the sludge flocs, and the sludge settling rate were found to be the main reasons for the CTAB improvement of sludge dewatering performance.
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China.
authors.forename: Huaili
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhai
authors.affiliation: CNOOC Tianjin Chemical Research and Design Institute, Tianjin, China.
authors.forename: Houkai
authors.initials: H
authors.lastname: Teng
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China.
authors.forename: Chuanliang
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liao
mesh_terms: D002412:Cations / Q000737:chemistry*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D012722:Sewage / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D014865:Waste Disposal, Fluid
chemical_list: D002412:Cations; D012722:Sewage; D013501:Surface-Active Agents