模拟河道生物反应器原位修复受污染水源水研究

以弹性填料为载体,考察了模拟河道生物反应器处理受污染水源水过程挂膜启动特性,并对曝气强度、水力停留时间(HRT)等工艺参数进行了系统性能影响研究.结果表明,模拟河道反应器经24 d挂膜启动后,氨氮(NH3-N)、总磷(TP)、高锰酸盐(CODMn)的平均去除率分别达61.0%,29.6%,16.0%;HRT 24 h、体系溶解氧(DO)质量浓度(ρ)5.5~6.5 mg.L-1条件下,反应系统具有稳定的污染物去除能力,NH3-N,TN,TP,CODMn的去除率分别达到75.0%,11.1%,11.1%和26.1%.同时,增大曝气量和缩短HRT,污染物的去除效果均略有下降,后者对生物膜去污性能的影响较大.镜检结果发现,模拟河道反应器运行过程填料表面逐渐发生变化,由无色向棕褐色、褐绿色转变,并出现了藻类、细菌和后生动物等,生物量逐渐增多.结果初步揭示,填料表面附着的生物量及微生物种类与其对污染物的去除效率具有一定的相关性.

IN-SITU BIOREMEDIATION OF POLLUTED SOURCE WATER WITH SIMULATED RIVER BIOREACTOR

A simulated river reactor with developed biofilm on elastic plastic filler was used for in situ remediation treatment of polluted source water. Reactor start-up, effect on aeration intensity and hydraulic retention time effect on remediation performance were all investigated. After continued operation for 24 days, the average removal efficiencies for NH_3-N, TP and COD_(Mn)Were 61.0%, 29.6% and 16.0%, respectively. Operated at a hydraulic retention time of 24 h and dissolved oxygen of 5. 5 - 6. 5 mg·L~(-1), maximum pollutant removal was achieved with average removal efficiencies for NH_3-N, TN, TP, COD_(Mn), at 75.0%, 11.1%, 11. 1% and 26. 1%, respectively. Increasing aeration intensity or reducing hydraulic retention time resulted in a decrease in the efficiency of pollutant removal. The filler surface changed steadily during the course of bioreactor operation, surface color changing from colorless to chocolate brown, to breen, along with increased biomass and the appearance of microorganisms (alga, bacteria and metazoan). Biomass and microorganism attachment had positive correlation with pollutant removal.