复合式MBR处理高氨氮废水的试验研究

A/O Hybrid Membrane Bioreactor for High-Loaded Ammonia Wastewater Treatment

利用自制的复合式膜生物反应器（HMBR），对高浓度氨氮废水进行脱氮研究．当进水COD／TN在0．5～4．9范围内时，COD，NH3-N及TN去除率均随COD容积负荷增加而升高，COD容积负荷达4．2kg／（mkd）以上时，COD，NH3-N及TN平均去除率分别达到91．5％，90．3％，60．2％以上；悬浮相污泥的比NH3-N降解速率为0．298gNH3-N／（gMLSS-d）；好氧混合液pH值每下降1，NH3-N浓度平均降低15mg／L；反应器出水中可检出大量的亚硝酸盐氮和硝酸盐氮，二者的浓度保持相同的变化趋势，其比值大约为1．78，表明复合式MBR的脱氮作用是通过短程硝化-反硝化途径实现的。

Continuous treatment of high-loaded ammonia nitrogen wastewater was carried out by a self-made hybrid membrane bioreactor. When the ratio of influent COD/TN was in the range of 0. 5- 4. 9, it was found that higher volumetric load of COD could produce higher removal efficiency of COD, ammonia nitrogen and total nitrogen. When the volumetric load of COD was more than 4.2 kg/ （m3· d）, the average removal efficiency of COD, ammonia nitrogen and total nitrogen were more than 91.5%, 90. 3% and 60. 2% respectively. The ammonia nitrogen specific degradation rate from suspended activated sludge was 0. 298 gNH3-N/ （gMLSS · d）. As the pH of aerobic mixed liquor reduced 1, the concentration of ammonia nitrogen reduced 15 mg/L on average. Much nitrate and nitrite which kept the same trend could be found in the effluent, and the ratio of NO2-N/NO3^--N was about 1. 78. The results suggest that the removal of nitrogen by hybrid membrane bioreactor is achieved through short-cut nitrification and denitrification.