壳聚糖联合聚合氯化铝强化混凝除藻的参数优化

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Abstract

The enhanced removal rate (RR) of Microcystis aeruginosa and Anabaena flos-aquae as a result of the combination of chitosan (CTS) and polyaluminum chloride (PAC) was observed. In order to reveal the effects of CTS, PAC, initial pH and dosing order on coagulation, single factor experiment and response surface methodology were used. In the condition of CTS 0.40mg/L, PAC 1.19mg/L, raw water pH 7.5and PAC/CTS (PAC and CTS premixed), M. aeruginosa(chlorophyll-a (chl-a) 45~55μg/L) could achieve a chl-a RR of 95.7% (close to the prediction of 96.1%). As for A. flos-aquae (chl-a 80~90μg/L), in the condition of CTS 0.25mg/L, PAC 2.00mg/L, raw water pH 7.9and CTS+PAC (CTS added first), could achieve a chl-a RR of 97.0% (close to the prediction of 97.9%). At pH 9.0(a simulation of alkaline algae-containing water), compared with the other two dosing orders, the type of PAC/CTS was the most effective in removing algae, leading to a chl-a RR of 94.9% for M. aeruginosa and 95.3% for A. flos-aquae. The cost of 0.40mg/L CTS and 2.00mg/L PAC for M. aeruginosa removal would be ¥0.0215/m³ and that of 0.24mg/L CTS and 2.00mg/L PAC for A. flos-aquae would be ¥0.0149/m³.

Key words： Microcystis aeruginosa Anabaena flos-aquae response surface methodology chitosan polyaluminum chloride coagulation

Received: 02 November 2018

PACS:

X131.2

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	Articles by authors
	LIANG Han-ying
	CHENG Xiao-wei
	LI Jun-peng
	YANG Xue-qiang
	PAN Wei-bin

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LIANG Han-ying,CHENG Xiao-wei,LI Jun-peng等. Parametric optimization of cyanobacteria coagulation by combining chitosan and polyaluminum chloride[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2568-2576.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I6/2568

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