摘要
以壳聚糖改性的太湖原位沉积物为分散介质,应用Y-型再悬浮发生装置,通过定量模拟太湖常见的中等级别风情,研究再悬浮作用下,改性沉积物对蓝藻水华的絮凝去除作用.结果表明,在黏土加入量为0.2 g.L-1,壳聚糖分别为0.100和0.150g.L-1,其蓝藻的去除率分别为93.55%和99.19%;在静止30 min后,壳聚糖加入量为0.15 g.L-1时,水体的浊度去除率达到78.60%;静止8 h后,水体的浊度去除率达到93.88%.同时,短期内壳聚糖的加入对水体中PO43--P有一定的去除作用.初步结果表明,在中风风情下,壳聚糖的加入量为0.15 g.L-1时,能更有效地去除蓝藻.表明利用壳聚糖改性沉积物来絮凝沉降太湖水华藻体,具有较好的应用前景.对比研究表明,引入水动力强度和水柱高度定量模拟方法,在确定壳聚糖投加量絮凝除藻中,具有明显的方法优势.
Removal effects of cyanobcateria algal cells in chitosan-mediated in-situ-sediment in the sediment resuspension was studied in the laboratory. The research simulated the sediment suspension through quantitative simulated the middle-grade wave of lake Taihu, which usually experienced, by using the Y-type sediment resuspended generator. The results showed that the blue-green algal＇ s removal effect is 93.55% and 99.19% as the dosage adding of chitosan and sediment were （0. 100 ＋ 0.200） g·L^-1 and （0.150 ＋ 0.200） g·L^-1, respectively. The removal rate of turbidity of the water body reached 78.60% after still 30 min, in which the ehitosan adding dosage was 0.150 g·L^-1 the removal rate of turbidity achieved 93.88% after 8h of water body still. Furthermore, adding the chitosan could decrease the PO4^3- -P concentration of water body in a short term. Preliminary results showed that the chitosan which adding dosage was 0.15 g·L^-1 could effectively remove the cyanobacteria cells in middle-grade wave situation; and also indicates using the chitosan-mediated sediment to flocculate the algal bloom of the Taihu Lake has a better application prospect. Contrast study shows that the quantitative simulation method of hydrodynamic intensity and the height of water has the obvious advantage to determine the dosage of chitosan in algal-flocculation removal.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期52-57,共6页
Environmental Science
基金
国家自然科学基金项目(40730528)
国家重点基础研究发展规划(973)项目(2008CB418105)
江苏省科技厅太湖水污染治理科技专项(BS2007161)
