Parametric optimization of cyanobacteria coagulation by combining chitosan and polyaluminum chloride [壳聚糖联合聚合氯化铝强化混凝除藻的参数优化]

作者：Liang H.-Y.; Cheng X.-W.; Li J.-P.; Yang X.-Q.; Pan W.-B.^*

来源：China Environmental Science, 2019, 39(6): 2568-2576.

• Anabaena flos-aquae
• Chitosan
• Coagulation
• Microcystis aeruginosa
• Polyaluminum chloride
• Response surface methodology

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.

• 单位
  华南理工大学