一体化IMBR处理低碳城市污水的脱氮研究

Study on Removal of Nitrogen from Urban Sewage with Low Carbon Source by Integrated Intermittent-aeration Membrane Bioreactor

在进水C/N为3、4、5和HRT为4、8、12h的条件下,研究了一体化间歇曝气膜生物反应器(IMBR)对COD、NH4+-N、TN的去除效果。研究表明,在低C/N条件下,IMBR仍有很好的脱氮效果,出水COD、TN、NH4+-N达到了GB18918—2002标准的一级A标准;随着C/N的增加则对各污染物的去除率都有所升高;随着HRT的延长,IMBR对COD、TN、NH4+-N的去除率有较大的提高,但当HRT>8h后,随着HRT的延长,对COD的去除率反而略有下降。

The integrated intermittent-aeration membrane bioreaetor （IMBR） was used to treat the urban sewage with low C/N ratio. The removal effieieneies of COD, TN and NH4^＋ - N by IMBR were researched under the average influent C/N ratio of 3, 4 and 5 and the hydraulic retention time （I-IRT） of 4 h, 8 h and 12 h respectively. The results show that the nitrogen removal efficiency by IMBR is better under the low C/N ratio. The eoneentrations of COD, TN and NH4^＋ - N in the effluent of IMBR meet the first level A criteria specified in the Diseharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. The pollutants removal effieieneies increase with the C/N ratio increasing. In addition, the removal effieieneies of COD, TN and NH4^＋ - N by IMBR are improved greatly with the HRT prolonging. But the COD removal efficiency is reduced with the HRT prolonging when the HRT exceeds 8 h.