晚期垃圾渗滤液厌氧氨氧化脱氮及其抑制动力学

采用晚期垃圾渗滤液对UASB反应器中无机环境培养条件下厌氧氨氧化菌进行驯化,探讨基质浓度和水力停留时间对系统运行性能的影响,通过批式试验分别对基质和垃圾渗滤液抑制厌氧氨氧化动力学进行测定并建立相应的动力学模型.结果表明,经过75d的运行,系统逐渐适应垃圾渗滤液并实现高效脱氮.基质的去除量随进水基质浓度的升高呈先升高后降低的变化趋势.随着HRT的延长,进水基质及渗滤液浓度逐渐升高,系统脱氮效果降低.厌氧氨氧化基质抑制的阈值是NH₄⁺-N浓度为489.03mg/L和NO₂^--N浓度为192.36mg/L.当以铵盐为抑制剂时,V_{max(NH4⁺-N)}为0.1893mg/(mg·d),半饱和常数为39.39mg/L,抑制动力学常数为3482.27mg/L.当以亚硝酸盐为抑制剂时,V_max(NO2^--N)为0.246mg/(mg·d),半饱和常数为43.19mg/L,抑制动力学常数为701.15mg/L.厌氧氨氧化受垃圾渗滤液影响尤为显著,垃圾渗滤液条件下厌氧氨氧化活性被完全抑制的浓度为1450.69mg/L (以COD计) .

Nitrogen removal and inhibition kinetics of ANAMMOX reactor fed with the mature landfill leachate

The mature landfill leachate was adopted to cultivated anaerobic ammonia oxidation bacteria in the UASB reactor which fed with inorganic wastewater, the running performance of the system was explored in different substrate concentration and hydraulic retention time, the activity inhibition of anaerobic ammonia oxidation by substrate and landfill leachate and the inhibition kinetics were analyzed. The system adapted to the landfill leachate gradually and implement efficient denitrification when the system run 75d. The removal amount of substrate was increased at first and then decreased with the increasement of the substrate concentration. As the extension of HRT, the concentrations of substrate and landfill leachate was increased, the effect of denitrification was decline in system. The thresholds of substrate inhibition were that NH₄⁺-N concentration was 489.03mg/L and NO₂^--N concentration of 192.36mg/L. when NH₄⁺-N was inhibitor, V_{max(NH4⁺-N)} was 0.1893mg/(mg·d), the half-saturation constant was 39.39mg/L, the inhibiting kinetic constant was 3482.27mg/L; when NO₂^--N was inhibitor, V_max(NO2^--N) was 0.246mg/(mg·d), the half-saturation constant was 43.19mg/L, the inhibiting kinetic constant was 701.15mg/L. Anaerobic ammonia oxidation is very susceptible especially by the landfill leachate, the activity of anammox was inhibited completely when the landfill leachate concentration was 1450.69mg/L (which calculated in COD).