粉末活性炭一超滤膜组合工艺去除水体中藻类及微囊藻毒素

摘要

研究粉末活性炭(PAC)、超滤膜(UF)及二者组合工艺对微囊藻毒素(MC-RR)及藻细胞的去除效果,发现粉末活性炭对MC-RR吸附容量为0.23μg/g,其吸附等温线可以用Langmuir吸附等温线模拟,吸附效果随PAC投加量增大而增大.单独超滤膜运行初期对MC-RR去除效果仅为8.5％,且随着藻细胞在超滤膜上聚集,去除率有所下降.BPAC-UF组合工艺运行初期MC-RR去除率达到85％,运行20 d后去除率稳定在70％.对组合工艺中微生物进行高通量测序显示在门水平上变形菌门和拟杆菌门分别占比为80.8％和11.6％,在种水平上最主要的三类为粘细菌、屈挠杆菌和甲基营养菌,其占比分别为34.3％、8.4％和12.7％.%Removal efficiency of microcystin (MC-RR) and microcystis cells by powdered activated carbon (PAC),ultrafiltration membrane (UF) and PAC-UF combination process was discussed.Results showed that adsorption capacity of PAC on MC-RR was 0.23 μg/g,and isotherms could be simulated by Langmuir adsorption isotherm.Adsorption effect was proportional to dosage of PAC.In the initial stage of UF operation,removal rate of MC-RR was 8.5％,but the removal efficiency was decreased with the aggregation of microcystis cell on the UF surface.The initial MC-RR removal rate of BPAC-UF combination process was 85％ and stabilized at 70％ after 20 days.Micro-organisms on PAC were determined by high throughput sequencing.Result indicated that proteobacteria and bacteroidetes accounted for 80.8％ and 11.6％ respectively.Three main types of bacterial genus were haliangium (34.3％),flexibacter(8.4％),methloversatilis(12.7％).