膜生物反应器亚硝化性能的影响因素研究

利用膜生物反应器成功启动了亚硝化工艺处理人工合成废水.为了确定影响亚硝化工艺效果的因素,先后对温度和溶解氧浓度进行了研究,结果表明,在温度35℃并且NH4+-N负荷平均0.45 kg.(m3.d)-1和溶解氧0.5 mg/L的条件下,可使出水中NO3--N的浓度低于20 mg.L-1,而ρ(NO2--N)∶ρ(NH4+-N)接近1.0.同时发现反应器运行期间,在低溶解氧的情况下,膜组件的污染并不严重.荧光原位杂交分析发现,在膜生物反应器中氨氧化菌成为优势菌种,亚硝酸盐氧化菌的活性受到了抑制.微生物群落分析则进一步提供了实现亚硝化工艺所必需的生物信息.

Influence of Controlling Factors on Partial Nitrification Performance in Membrane Bioreactor

A membrane bioreactor (MBR) was developed successfully to carry out partial nitrification process. Temperature, and dissolvedoxygen (DO) were investigated as the factors which may affect the results. It has been proved that the optimal operational parameters were at35℃, ammonia loading 0.45 kg·(m~3·d)~(-1) and <0.5 mg/L, respectively, with the effluent NO_3~- -N concentration below 20 mg·L~(-1) andρ(NO_2~- -N)/ρ(NH_4~+ -N) ratio being close to 1.0. It is not observed severe membrane fouling during all the experiment. Fluorescence in situhybridization analysis indicated that aerobic ammonium oxidizers were the dominant population, and nitrite-oxidizing bacteria were inhibited.The microbiological community analysis further provided the necessary biological information for the realization of partial nitrification.