【摘要】 为了研究低DO浓度下对污染物的去除效果,采用SBR反应器,通过缺氧/好氧(A/O)的运行方式,考察了好氧段DO的平均值为1 mg/L时系统的除污效果,同时与好氧段DO平均值为2 mg/L时系统的除污效果进行了对比。结果表明:在低DO浓度下,SBR工艺出水COD<40mg/L,系统对COD的去除率在90%左右,对COD的去除效果略高于正常DO值条件下的;低DO浓度下,系统对氨氮的去除率在90%左右,对氨氮的去除效果低于正常DO值条件下的,但出水氨氮仍可保持在5 mg/L左右;系统的硝化反应速度较慢,反应结束时亚硝酸盐氮积累率为37%;NO x--N生成速率与NH 4+-N氧化速率之比与DO浓度呈较好的线性关系;DO浓度对正磷酸盐的去除效果影响较小,系统对正磷酸盐的去除率>90%,出水正磷酸盐浓度<0.5 mg/L;出水非常清澈,镜检可见丝状菌。更多还原

【Abstract】 In order to study the pollutant removal efficiency under low DO,the pollutant removal efficiency at mean DO value of 1 mg/L in aerobic zone of sequencing batch reactor(SBR) operated in anoxic/aerobic(A/O) mode was investigated and compared with that at mean DO value of 2 mg/L.The results show that under low DO,the effluent COD is less than 40 mg/L,the COD removal rate can reach about 90%,and the COD removal efficiency is slightly more than that under normal DO.The ammonia nitrogen removal rate can reach about 90%,the ammonia nitrogen removal efficiency is less than that under normal DO,but the effluent ammonia nitrogen is about 5 mg/L.The nitrite nitrogen accumulation rate is 37% at the end of the reaction with lower nitrification rate.There is a good liner relationship between the ratio of NO-x-N formation rate to NH+4-N oxidation rate and DO concentration.The DO concentration has little effect on the orthophosphate removal efficiency,the orthophosphate removal rate is more than 90%,and the effluent orthophosphate concentration is less than 0.5 mg/L.The effluent is clear,and filamentous bacteria can be seen.更多还原