射流曝气MBR工艺处理城市污水的研究

传统膜生物反应器(MBR)的能耗较大、运行费用较高,为此开发了射流曝气MBR工艺。采用其处理某开发区污水,在进水COD为60～300 mg/L、氨氮为3～30 mg/L、总磷为0.8～5 mg/L、水力停留时间为2 h的条件下,出水COD、氨氮、总磷的平均值分别为25、1.27、1.66 mg/L,平均去除率分别为84%、93%、46%。反应器采用射流曝气方式,提高了氧的转移效率,大幅降低了能耗,与常规MBR相比则节能达70%。近一年的运行表明,射流曝气对膜丝的正常工作没有任何影响,其清洗周期保持不变。

Jet Aeration Membrane Bioreactor for Treatment of Municipal Wastewater

Due to high energy consumption and operation cost of the conventional membrane bioreactor (MBR), the jet aeration MBR was developed and used to treat the wastewater from a development zone. Under the conditions of the influent COD 60 to 300 mg/L, NH_3-N 3 to 30 mg/L, TP 0.8 to 5 mg/L and HRT 2 h, the average effluent concentrations of COD, NH_3-N and TP are 25 mg/L, 1.27 mg/L and 1.66 mg/L, and their average removal rates are 84%, 93% and 46% respectively. By adopting jet aeration method, the oxygen utilization rate is improved and the energy consumption is reduced remarkably. The energy is saved by 70% compared to conventional MBR. The operation for about one year shows that the jet aeration method has no influence on the membrane and its cleaning period.