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以齿轮型生物载体为悬浮填料,在连续或间歇曝气条件下,改变气水比,对氨氮含量为1.5~2.5 mg/L、浊度为15~20 NTU的东平河微污染原水进行生物接触氧化预处理,研究其挂膜与处理特性以及停曝比、气水比等对去除氨氮的影响。结果表明:仅需7 d填料表面即附着一层黄褐色的生物膜,其以菌胶团为主,生物量达70 nmol/g。连续曝气,且气水比为(0.5∶1)和(1∶1)时,对氨氮的平均去除率分别为75%和66%;而在间歇曝气条件下,停曝比为(3∶5)~(3∶1)时,对氨氮的去除率增加显著,达80%~90%。氨氮浓度>2 mg/L时,出水亚硝酸盐氮含量达0.15~0.25 mg/L,但仍满足饮用水水质标准。
A gear-type biological carrier was used as the suspending filler to change the gas-water ratio under the condition of continuous or intermittent aeration. Bio-contact was carried out on raw water of Dongping River slightly polluted with ammonia nitrogen of 1.5-2.5 mg / L and turbidity of 15-20 NTU Oxidation pretreatment, to study its hanging film and processing characteristics and stop-off ratio, gas-water ratio on the removal of ammonia nitrogen. The results showed that only a yellowish brown biofilm was attached to the surface of the packing for 7 days, which was mainly composed of micelles with a biomass of 70 nmol / g. The average removal rates of ammonia nitrogen were 75% and 66% for continuous aeration with gas-water ratio of (0.5:1) and (1: 1), respectively. On the other hand, : 5) ~ (3:1), the ammonia nitrogen removal rate increased significantly, reaching 80% ~ 90%. Nitrite nitrogen concentration> 2 mg / L, the effluent nitrite nitrogen content of 0.15 ~ 0.25 mg / L, but still meet drinking water quality standards.