聚合氯化铝铁和粘土应急去除蓝藻的室外模拟研究

文章在开展PAFC去除淡水中的铜绿微囊藻影响因素的室内模拟研究基础上进行PAFC和粘土应急去除巢湖水中蓝藻的室外模拟研究。结果表明,在20 mg/L的絮凝剂用量下,聚合氯化铝铁(PAFC)对巢湖水中蓝藻的沉降去除效果优于聚合氯化铝,达到97.7%。PAFC,PAFC和粘土(高岭石或海泡石)可以快速高效絮凝沉降巢湖水中的蓝藻,并且在30 d之内除藻率稳定地维持90.0%以上。同时探讨其对藻毒素释放抑制的影响,结果表明,加入PAFC和粘土(海泡石或高岭石)1 d后能有效地吸附水中的藻毒素,PAFC和海泡石组的吸附去除率大于PAFC和高岭石,且30 d内仍一直维持藻毒素浓度低于对照组。

Outdoor Simulation of Flocculation of Cyanobacterial Pellets in Chaohu Lake Using Polyaluminum Ferric Chloride and Clays

Outdoor simulation of using PAFC and clays to remove cyanobacterial cells urgently in test water collected in Chaohu Lake were done in situ,based on indoor simulation of effect of factors on removal efficiency of Microcystis aeruginosa cells in freshwater using PAFC.Results showed polyalluminum ferric chloride(PAFC) could reduce cyanobacterial cells in test water better than polyaluminum chloride,achieving 97.7% removal efficiency at the dose of 20 mg/L.PAFC,PAFC with clays(kaolinite or sepiolite) could dramatically flocculate and sediment cyanobacterial cells in test water and keep more than 90.0% removal efficiency in 30 days.Inhibition of the release of toxins by PAFC and clays was discussed simultaneously.It showed that PAFC and clays(kaolinite or sepiolite) could effectively adsorb toxins in test water in one day,and PAFC with sepiolite removed toxins in water more effectively than PAFC with kaolinite,kept the concentrations of toxins less than the control in 30 days.