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题名: Removal of Microcystis aeruginosa using cationic starch modified soils
作者: Shi, Wenqing; Tan, Wanqiao; Wang, Lijing; Pan, Gang
刊名: WATER RESEARCH
出版日期: 2016-06-15
卷号: 97, 期号:0, 页码:19-25
关键词: Cationic starch ; Modified local soil ; Algal flocculation ; Cyanobacterial bloom mitigation ; Floc breakage
DOI: 10.1016/j.watres.2015.06.029
部门归属: 环境纳米材料实验室
英文摘要: A cheap and biodegradable modifier, cationic starch (CS), was used to turn local soils into effective flocculants for Microcystis aeruginosa (M. aeruginosa) removal. The isoelectric point of soil particles was remarkably increased from pH 0.5 to 11.8 after modification with CS, which made CS modified soil particles positively charged and obtain algal flocculation ability. At the soil concentration of 100 mg/L, when the CS modifier was 10 mg/L, 86% of M. aeruginosa cells were removed within 30 min. Lower or higher CS dosage led to limited algal removal. About 71% and 45% of M. aeruginosa cells were removed within 30 min when CS was 5 mg/L and 80 mg/L, respectively. This is because only part of algal cells combined with CS modified soil particles through charge neutralization at low dosage, while flocs formed at high CS dosage were positively charged which prevents further aggregation among the flocs. The floc stability was quantified by a floc breakage index under applied shear force. Algal flocs formed at acid and alkaline conditions were more prone to be broken than those at the neutral condition. The cost and biodegradability concerns may be largely reduced through the use of CS modified local soils. For field applications, other practical issues (e.g., re-suspension) should be further studied by jointly using other methods. (C) 2015 Elsevier Ltd. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36001
Appears in Collections:环境纳米材料实验室_期刊论文

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