基质比对厌氧氨氧化耦合反硝化脱氮除碳的影响

Effect of Substrate Ratio on Removal of Nitrogen and Carbon Using Anaerobic Ammonium Oxidation and Denitrification

采用SBR处理实际生活污水,在实现半亚硝化时,其出水加入定量的Na NO_2作为厌氧氨氧化过程厌氧序批式反应器(ASBR)的进水.在温度为24℃、pH为7. 2±0. 2时,考察不同进水NO_2^--N/NH_4^+-N对厌氧氨氧化耦合反硝化脱氮除碳的影响.结果表明:(1)进水NO_2^--N/NH_4^+-N为1. 4～1. 6时系统脱氮效能最佳,NH_4^+-N、NO_2^--N和COD平均出水浓度分别为2. 14、1. 07和30. 50 mg·L^(-1),三者去除率分别为93. 62%、97. 79%和74. 75%,ΔNO_2^--N/ΔNH_4^+-N和ΔNO_3^--N/ΔNH_4^+-N分别为1. 60和0. 17,TN的去除是异养反硝化菌和厌氧氨氧化菌共同作用的结果.(2)随着进水NO_2^--N/NH_4^+-N的逐渐增大,厌氧氨氧化对脱氮的贡献率逐渐减小,异养反硝化对脱氮的贡献率逐渐增加.(3)典型周期内,NH_4^+-N和NO_2^--N的降解过程均为零级反应,线性关系良好,比降解速率分别为0. 404 mg·(g·h)^(-1)和0. 599 mg·(g·h)^(-1),两者的比降解速率之比为1. 48,COD的比降解速率呈现逐渐增大的趋势.

Real domestic sewage was treated in a sequencing batch reactor（ SBR）. When the partial nitrification of SBR was achieved,the effluent was fed with quantitative Na NO2,which served as the influent of the anaerobic ammonium oxidation（ ANAMMOX） process of the anaerobic SBR（ ASBR）. The effect of different substrate ratios on the removal of nitrogen and carbon using anaerobic ammonium oxidation and denitrification was investigated under conditions with a temperature of 24℃ and pH of 7. 2 ± 0. 2. The results showed that（1） the nitrogen removal efficiency was optimum when the influent NO2^--N/NH4^＋-N was 1. 4-1. 6. The average effluent concentrations of NH4^＋-N,NO2^--N,and chemical oxygen demand（ COD） were 2. 14,1. 07,and 30. 50 mg·L^-1,and their removal rates were93. 62%,97. 79%,and 74. 75%,respectively. The ΔNO2^--N/ΔNH4^＋-N and ΔNO3^--N/ΔNH4^＋-N ratios were 1. 60 and 0. 17,respectively. Total nitrogen was removed by the joint action of denitrifying and ANAMMOX bacteria.（2） When the influent ratio of NO2^--N/NH4^＋-N increased,the contribution of ANAMMOX to nitrogen removal decreased,but the contribution of heterotrophic denitrification to nitrogen removal increased gradually.（3） The NH4^＋-N and NO2^--N degradation processes corresponded with zero-order reactions and fitted the linear relationship in the typical cycle. Their specific degradation rates were 0. 404 and 0. 599 mg·（ g·h）^-1,respectively. Their ratio was 1. 48,and the specific degradation rate of COD gradually increased.