生物膜-磁分离集成装置处理污染河水工艺参数优化

Process parameter optimization of integrated biofilm-magnetic separation device for polluted river water treatment

采用生物膜-磁分离集成装置对污染河水进行了污染物去除实验。对集成装置的生物膜反应区、磁分离反应区分别进行单因素实验、响应曲面实验,研究了集成装置的关键参数对污染河水处理效果的影响,探寻其最佳工艺参数。结果表明:在生物膜反应区中,水力停留时间(HRT)、曝停比和温度分别在12 h、6∶6和28℃NH4+-N、TN和CODMn的去除率分别达到90%、60%和90%左右;在磁分离反应区中,聚合氯化铝(PAC)、聚丙烯酰胺(PAM)和磁种的投加量分别在133.02、2.96和171.66 mg·L-1的最优条件下,对生物膜处理水中TP的去除率达到了96.55%,且PAC投加量对除磷效果影响最为显著;稳定运行集成装置,出水NH4+-N、TN、CODMn和TP的去除率分别达到91.78%、61.25%、93.85%和97.12%。本实验结果为污染河水的脱氮除磷提供了重要参考。

The contaminated river water was treated by an integrated biofilm-magnetic separation device.In the biofilm reaction zone,the single-factor experiment was carried out while in the magnetic seperation reaction zone,the response method was carried out,which disclosed the effect of the key parameters of the integrated device on the treatment of polluted water,and determined the optimum process parameters.The results showed that in the biofilm reaction zone,the removal rates of NH4+-N,TN and CODMn were 90%,60%and 90%,respectively,at the optimal conditions such as hydraulic retention time(HRT)of 12 h,the ratio of non-aeration time to aeration time of 6∶6,and the temperature of 28℃.In the magnetic separation reaction zone,TP removal rate from biofilm treated water reached 96.55%at the optimal conditions such as polyaluminum chloride(PAC)dosage of 133.02 mg·L-1,polyacrylamide(PAM)dosage of 2.96 mg·L-1,and magnetic seeding dosage of171.66 mg·L-1,of which PAC dosage had a most significant effect on phosphorus removal.During the stable running of the integrated device,the removal rates of NH4+-N,TN,CODMn and TP in effluent reached 91.78%,61.25%,93.85%and 97.12%,respectively.This study provided an important theoretical basis for nitrogen and phosphorus removal from polluted river water.