序批式曝气生物滤池处理含海水污水中的硝化性能

Abstract

采用序批式曝气生物滤池工艺,以牡蛎壳为填料、含海水污水为处理对象,系统考察不同的海水含率、原水葡萄糖和氨氮浓度等原水条件下的硝化性能。结果表明,对于海水含率在40%到100%的污水处理,氨氮去除率可达到95%以上,表明该生物滤池中的氨氧化菌(AOb)可耐受较高的海水盐度;耐海水盐度的驯化硝化细菌中,AOb的耐盐度抑制能力强于亚硝酸氧化菌(nOb),当海水含率大于70%时,nOb的活性更容易受到抑制。在高海水盐度下,降低原水的葡萄糖与氨氮浓度可提高nOb活性。牡蛎壳附着生物膜与液相悬浮污泥中的AOb和nOb均参与了氨氮去除,生物膜中的AOb和nOb活性高于悬浮污泥。

The nitrification performance on which a sequencing batch aeration biofilter( SBABF) packing with oyster shell removed ammonia from sewage containing seawater was investigated using different parameters,such as seawater containing rate,glucose and ammonium concentrations in influent.The results showed that SBABF removed more than 95% of ammonia at seawater containing rate ranging from 40% to 100%,indicating that ammonia oxidizing bacteria( AOB) could tolerate the relatively higher seawater salinity.In the seawater salinity acclimatized nitrifying bacteria,the tolerability of AOB exhibited higher than that of nitrite oxidizing bacteria( NOB).When seawater containing rate was higher than 70%,the activity of NOB was inhibited more easily by seawater salinity.At the higher seawater salinity,the decrease of both glucose and ammonia concentrations in influent could increase the activity of NOB.In addition,we found that both AOB and NOB in the suspended sludge and bio-film at the shell involved in ammonia removal,and their activities in the biofilm was higher than that in the suspended sludge.