厌氧氨氧化工艺处理含海水污水的亚硝态氮抑制及反应动力学

采用ASBR厌氧氨氧化反应器,在全海水条件下,通过固定进水NH_4~+-N 110mg/L,逐渐提高进水NO_2~--N的方式研究了NO_2~--N对厌氧氨氧化脱氮的影响及抑制动力学和脱氮过程动力学.结果表明:进水NO_2~--N浓度达到170mg/L时,厌氧氨氧化反应开始受到明显抑制,NH_4~+-N的去除率下降8.41%;修正的Logistic过程动力学研究结果显示,进水NO_2~--N低于151.49mg/L会促进厌氧氨氧化反应的进行,进水NO_2~--N高于170mg/L时开始抑制厌氧氨氧化反应的进行;Luong模型适合描述全海水条件下高浓度NO_2~--N对厌氧氨氧化脱氮效能的抑制动力学.Luong模型得到的最大基质转化速率(NRR_(max))为0.53kg N/(m~3·d),出水NO_2~--N半饱和常数(KS)为0.10mg/L,净生长停止的出水NO_2~--N浓度(Sm)为338.22mg/L,Luong动力学常数(n)为0.41,相关系数为0.97801.

Treating sewage with seawater by ANAMMOX process: effects of nitrite and kinetics

An anaerobic sequencing batch reactor (ASBR) was operated to investigate the effects of nitrite on nitrogen removal via ANAMMOX by keeping influent ammonia nitrogen concentration as 110mg/L and increasing influent nitrite concentration at whole seawater condition. The kinetics features were also studied at the same time. ANAMMOX process began to be inhibited when the influent nitrite concentration was 170mg/L, and the ammonia nitrogen removal efficiency decreased 8.41%. The fitting of modified Logistic process kinetics model showed that influent nitrite less than 151.49mg/L would increase the nitrogen removal rate, while influent nitrite higher than 170mg/L would inhibited the nitrogen removal rate. The model of Luong suited to fit the inhibition kinetics with higher nitrite concentration which affected nitrogen removal efficiency. The maximum substrate removal rate (NRR_max) obtained by Luong model was 0.53kg N/(m³·d), and the half-saturation constant (K_S) was 0.10mg/L. The maximum allowable effluent nitrite concentration above which cells do not grow (S_m) was predicted to be 338.22mg/L and the correlation (n) was 0.97801.