包埋水华鱼腥藻和活性炭对污水中氮磷的净化

Purification of wastewater containing nitrogen and phosphorus by embedded Anabaena aquae and activated carbon

采用聚乙烯醇-海藻酸钠(PVA-SA)凝胶包埋水华鱼腥藻与活性炭混合物,对比水华鱼腥藻在包埋、吸附以及悬浮状态下对高浓度模拟废水中氨氮的去除效果,实验结果表明,水华鱼腥藻在包埋状态下对氨氮有更好的去除效果。通过正交实验研究SA、粉末活性炭(PAC)、水华鱼腥藻之间不同质量比的包埋混合物对去除污水中NH+4-N、TP以及处理后废水中微囊藻毒素(MC)残留量的影响,结果表明,当PVA量为8%时,SA、PAC和藻含量分别在0.5%、0.5%和0.2%为NH+4-N、TP的最佳去除组合,同时处理后污水中MC的含量也低于联合国标准1μg/L,避免了二次污染的同时为产毒素藻类的利用创造了条件。

In this study, polyvinyl alcohols （PVA） and sodium alginate （SA） as embedding medium were applied to immobilize Anabaena aquae and activated carbon, purification of which was investigated to remove NH4＋ -N in the high concentration synthetic wastewater through three statuses of embedded, adsorbed and suspen- ded. Results show that the embedded state had the best performance among them. SA, power activated carbon and Anabaena aquae were selected as three orthogonal design elements, different mass ratios of which had signifi- cant effect of eliminating NH4 -N, total phosphorus （TP） and microcystin （MC）. According to the research, the optimal parameters of embedding mixture were 0.5% SA, 0.5% PAC and 0.2% Anabaena aquae, respectively, when PVA accounted for 8%. And the concentration of MC in effluent was trace amount and far below 1 p,g/L the United Nations criterion. This study offered guidance to take advantage of algal which produced MC.