Flocculation of algae using chitosan
Flocculation of algae using chitosan
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DOI：
10.1023/a:1022137023257
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发表时间：
2002-10-01
影响因子：
3.3
通讯作者：
Pillai, VNS
中科院分区：
文献类型：
--
作者：
Divakaran, R;Pillai, VNS
在pH值为4 ~ 9，叶绿素a浓度为80 ~ 800 mg·m ~（-3）的条件下，研究了壳聚糖对三种淡水藻类（螺旋藻、颤藻和小球藻）和一种半咸水藻类（集胞藻）的絮凝作用，其产生的浊度为10 ~ 100比浊单位（NTU）。壳聚糖通过絮凝沉降有效地降低了藻类含量。絮凝效率对pH值非常敏感，淡水物种在pH 7.0时絮凝效率最高，而海洋物种絮凝效率较低。影响最大絮凝作用所需的最佳壳聚糖浓度取决于絮凝剂的浓度。当壳聚糖浓度高于最佳浓度时，絮凝和沉降速度更快。沉淀的藻类细胞是完整的和活的，但不会被机械搅拌重新分散。脱藻水可以再利用以产生藻类的新鲜培养物。
Flocculation of three freshwater algae, Spirulina, Oscillatoria and Chlorella, and one brackish alga, Synechocystis, using chitosan was studied in the pH range 4 to 9, and chlorophyll-a concentrations in the range 80 to 800 mg m(-3), which produces a turbidity of 10 to 100 nephelometric turbidity units (NTU) in water. Chitosan reduced the algal content effectively by flocculation and settling. The flocculation efficiency is very sensitive to pH, and reached a maximum at pH 7.0 for the freshwater species, but lower for the marine species. The optimal chitosan concentration that is required to effect maximum flocculation depended on the concentration of alga. Flocculation and settling were faster when concentrations of chitosan higher than optimal are used. The settled algal cells are intact and live, but will not be redispersed by mechanical agitation. The de-algated water may be reused to produce fresh cultures of algae.