HRT对悬挂链曝气式接触氧化处理污染河水的影响

EFFECT OF HRT ON CONTACT OXIDATION OF SUSPEND CHAIN FLOATING AERATION TREATING POLLUTED RIVER

考察了不同水力停留时间(HRT)下,厌氧-缺氧-悬挂链曝气式接触氧化对重、轻度污染河水的净化效果。结果表明,HRT为2、4、8、12h时,在重、轻度污水水质COD为58.67～85.33mg·L-1、26.67～42.67mg·L-1;NH4+-N为5.20～11.30mg·L-1、2.79～3.47mg·L-1;TN为8.10～14.18mg·L-1、3.15～3.38mg·L-1;TP为0.62～0.82mg·L-1、0.35～0.39mg·L-1两种典型进水水质情况下,COD、NH4+-N和TN的平均去除率都随HRT的增加而升高,但在HRT为8h后,平均去除率的增幅都变小。TP在重、轻度污水时随HRT变化去除率差异不大。考虑节能与效率,该工艺适宜的HRT为8h,此时重、轻度污染河水的主要污染指标平均去除率COD为61.87%、25.39%;NH4+-N为61.25%、51.04%;TN为37.66%、26.51%;TP为10.19%、8.77%。

Anaerobic-anoxic-suspend chain floating contact oxidation was investigated to treat heavy and light polluted fiver at different hydraulic retention time （HRT）. The results showed that under the condition of HRT was at 2 h, 4 h, 8 h and 12 h, when influent was heavy polluted fiver, COD： 58.67 ～85.33 mg- L^-1,NH4^＋-N： 5.20 ～ 11.30 mg· L^-1,TN： 8.10 ～ 14.18 mg· L^-1,TP： 0.62 ～0.82 mg· L^-1; light polluted fiver, COD：26.67 ～42.67 mg· L^-1, NH4^＋-N：2.79～3.47 mg.L^-1, TN：3.15～3.38 mg-L^-1, TP：0.35～0.39 mg.L^-1, the average removal rate of COD, NH4^＋-N and TN increased with HRT increasing, but after 8 h, the amplitude of average removal was lessening. The average removal rate of TP was little different with the changing of HRT at heavy and light polluted fiver. To consider energy conservatiori and efficiency, the HRT for this technics was 8 h, then the average removal rate of main polluted index was COD：61.87%,25.39%; NH4^＋-N：61.25%,51.04%; TN：37.66%,26.51%; TP：10.19%,8.77%.