Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
| Autor: | Wu Xunfang, Song Weijun, Xie Yu, Hu Jiapeng, Xi Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
endocrine system diseases Health Toxicology and Mutagenesis Parametric optimization education 0208 environmental biotechnology Polyacrylamide 02 engineering and technology 010501 environmental sciences Environmental technology. Sanitary engineering 01 natural sciences response surface methodology chemistry.chemical_compound health services administration Coagulation (water treatment) GE1-350 coagulation TD1-1066 polyaluminum chloride 0105 earth and related environmental sciences Water Science and Technology Chemistry Cationic polymerization food and beverages successive bloom cationic polyacrylamide humanities 020801 environmental engineering Exponential function Environmental sciences Chemical engineering cyanobacterial growth phase Polyaluminum chloride |
| Zdroj: | Aqua, Vol 70, Iss 3, Pp 317-327 (2021) |
| ISSN: | 1605-3974 0003-7214 |
| DOI: | 10.2166/aqua.2021.110 |
| Popis: | Microcystis spp. is the most common and problematic species during cyanobacterial bloom. This study employed Microcystis aeruginosa for coagulation experiments. Effects of polyaluminum chloride (PAC), cationic polyacrylamide (CPAM), and pH value on cyanobacterial removal at exponential and decline phases by coagulation were investigated by measuring chlorophyll a. A mathematical model between factors and response variables was established using response surface methodology (RSM). Results showed that factors of CPAM dosage, PAC dosage, and pH value could strongly affect the removal ratio of Microcystis at both exponential and decline phases. RSM revealed that the order of influence factors on the removal of chlorophyll a was CPAM > PAC > pH for Microcystis at the exponential phase, and these orders of CPAM > PAC > pH (PAC coagulation) and CPAM > PAC > pH (CPAM coagulation) were for Microcystis at the decline phase. It suggested that the growth phase of cyanobacteria was also quite important to optimize the coagulation process. Besides, a fitted model was developed, and it could well predict the removal ratio of chlorophyll a by coagulation with various treatments. The model recommended dosages of CPAM (3.72 mg/L) and PAC (10.23 mg/L) for Microcystis at the exponential phase with a pH value of 8.25, and dosages of CPAM (5.98 mg/L) and PAC (17.81 mg/L) were for Microcystis at the decline phase with a pH value of 8.21. Overall, these results would provide a technical guideline of combining PAC and CPAM to treat cyanobacteria at exponential and decline phases. HIGHLIGHTS Effects of PAC, CPAM, and pH differed for Microcystis at exponential and decline phases.; Interaction between PAC and CPAM dosages was significant during coagulation.; Fitted models could well predict the actual removal ratio of Microcystis by coagulation.; The removal ratio of Microcystis reached 82.49–94.38% with optimized dosages of PAC and CPAM. |
| Databáze: | OpenAIRE |
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