Impacts of epichlorohydrin-dimethylamine on coagulation performance and membrane fouling in coagulation/ultrafiltration combined process with different Al-based coagulants.
Two kinds of aluminum-based coagulants and epichlorohydrin-dimethylamine (DAM-ECH) were used in the treatment of humic acid-kaolin simulated water by coagulation-ultrafiltration (C-UF) hybrid process. Coagulation performance, floc characteristics, including floc size, compact degree, and strength were investigated in this study. Ultrafiltration experiments were conducted by a dead-end batch unit to implement the resistance analyses to explore the membrane fouling mechanisms. Results showed that DAM-ECH aid significantly increased the UV254 and DOC removal efficiencies and contributed to the formation of larger and stronger flocs with a looser structure. Aluminum chloride (Al) gave rise to better coagulation performance with DAM-ECH compared with poly aluminum chloride (PACl). The consequences of ultrafiltration experiments showed that DAM-ECH aid could reduce the membrane fouling mainly by decreasing the cake layer resistance. The flux reductions for PACl, Al/DAM-ECH (dosing both Al and DAM-ECH) and PACl/DAM-ECH (dosing both PACl and DAM-ECH) were 62%, 56% and 44%, respectively. Results of this study would be beneficial for the application of PACl/DAM-ECH and Al/DAM-ECH composite coagulants in water treatment processes.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, People's Republic of China.
Fan
F
Bu
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, People's Republic of China. Electronic address: baoyugao_sdu@aliyun.com.
Baoyu
B
Gao
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, People's Republic of China.
Ruihua
R
Li
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, People's Republic of China.
Shenglei
S
Sun
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, People's Republic of China.
Qinyan
Q
Yue
D000536:Aluminum Hydroxide / Q000737:chemistry*; D003029:Coagulants / Q000737:chemistry / Q000494:pharmacology*; D004123:Dimethylamines / Q000737:chemistry / Q000494:pharmacology*; D004811:Epichlorohydrin / Q000737:chemistry / Q000494:pharmacology*; D005427:Flocculation / Q000187:drug effects*; D006812:Humic Substances / Q000032:analysis; D008567:Membranes, Artificial; D014462:Ultrafiltration / Q000379:methods*; D018508:Water Purification / Q000379:methods
D003029:Coagulants; D004123:Dimethylamines; D006812:Humic Substances; D008567:Membranes, Artificial; D004811:Epichlorohydrin; D000536:Aluminum Hydroxide
Aluminum-based coagulant; Coagulation; DAM-ECH aid; Floc properties; Membrane fouling