期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 490, 期 -, 页码 258-267出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2015.11.056
关键词
Dual-coagulant; Composite coagulant; Cell integrity; Microcystins; Extracellular organic matter; Drinking water treatment
资金
- Program for New Century Excellent Talents in University of the Ministry of Education of China [NCET-12-0341]
- International Science & Technology Cooperation Program of China [2010DFA91150]
- International Cooperation Research of Shandong Province [2011176]
- Science and Technology Development Project of Shandong Province [2012GHZ30020]
- National Science Fund for Excellent Young Scholars [51322811]
The effects of two chitosan (CTS)-aluminum chloride (AC) dual-coagulants with different dosing orders and a composite coagulant CTSAC (CTS and AC premixed) on removal of Microcystis aeruginosa (M. aeruginosa) cells and second metabolites in cyanobacteria-laden drinking water treatment were investigated, and in comparison with AC and CTS. Response surface methodology (RSM) was used to model and optimize the coagulation processes. The coagulation mechanisms were investigated via zeta potential, scanning electron microscope (SEM), and three-dimensional excitation-emission matrix spectra (EEM) analyses. The investigated dual/composite coagulants caused no evident damage to M. aeruginosa cells, and achieved better removal effects than coagulant individually applied. The CTSAC removed cells was the most effective for stronger entrapment and bridging ability. While the highest adsorption of extracellular microcystins (MCs) was obtained through AC-CTS (AC added firstly). CTS-AC (CTS added firstly) provided slight higher extracellular organic matter (EOM) removal. The optimal coagulation performance was obtained when CTSAC was set as 2.6 mg/L CTS plus 7.5 mg/L AC, under which 97.8% of intact cells, 53.08% of extracellular MCs and almost all EOM were simultaneously removed. Overall, the combination of CTS and AC coagulation process has proven to be a better substitute for conventional coagulation in cyanobacteria-laden drinking water treatment. (C) 2015 Elsevier B.V. All rights reserved.
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