两段式MBBR亚硝化-厌氧氨氧化处理污泥消化液

Two-stage MBBR of Partial Nitritation-ANAMMOX for Treatment of Thermal-hydrolysis Anaerobic Digester Effluent

采用两段式MBBR亚硝化-厌氧氨氧化工艺处理含有高浓度氨氮的污泥热水解厌氧消化液。结果表明,当进水NH_(4)^(+)-N浓度为(750.32±32.21)mg/L时,亚硝化反应器的氮负荷可达到1.25 kg/(m^(3)·d),平均出水NO_(2)^(-)-N/NH_(4)^(+)-N值为1.18±0.18,满足厌氧氨氧化进水水质要求。厌氧氨氧化反应器的氮负荷可达到0.84 kg/(m^(3)·d),TN平均去除率为76.05%。在进水COD为(932±39)mg/L的条件下,亚硝化和厌氧氨氧化反应器出水COD浓度分别为(623±43)、(590±45)mg/L,COD的降解主要在亚硝化段完成,其对COD的去除贡献可达87.16%。在处理污泥热水解厌氧消化液后,氨氧化菌(AOB)和厌氧氨氧化菌活性分别损失了21.17%和39.82%,表明污泥热水解厌氧消化液中的复杂有机物对脱氮微生物有抑制作用,尤其是对厌氧氨氧化菌。

A two-stage MBBR of partial nitritation-ANAMMOX process was employed for the treatment of thermal-hydrolysis anaerobic digester effluent with high ammonia nitrogen.When the influent NH_4~+-N was(750.32±32.21)mg/L,the partial nitritation reactor reached a nitrogen load of 1.25 kg/(m~3·d),with an average effluent NO_2~--N/NH_4~+-N ratio of 1.18±0.18,meeting the influent quality requirement for ANAMMOX.The ANAMMOX reactor was capable of reaching a nitrogen load of 0.84 kg/(m~3·d),with an average TN removal rate of 76.05%.Under the condition of influent COD at(932±39)mg/L,the effluent COD from the partial nitritation and ANAMMOX reactors were(623±43)mg/L and(590±45)mg/L,respectively.The degradation of COD was primarily achieved in the partial nitritation reactor,with its contribution to COD removal reaching 87.16%.After treating thermal-hydrolysis anaerobic digester effluent,the activities of ammonia oxidizing bacteria(AOB)and ANAMMOX bacteria decreased by21.17%and 39.82%,respectively,indicating that the complex organic matter had an inhibitory effect on nitrogen removal microorganisms,particularly on ANAMMOX bacteria.