盐度与滤料量对生物膜降氨氮作用的影响

淡水中培养的生物膜,去氨氮能力随盐度上升及升盐速率的增加而逐渐下降,当盐度由0.6升至13.3、23.9和31.3并稳定48 h后,氨氮去除率分别为100%、93.0%和86.9%;当按不同的速度降盐至淡水环境时,生物膜去氨氮的能力逐步得以恢复,特别是降到淡水时,去氨氮率均达90%以上,基本达到淡水中生物膜去氨氮的能力。经24~36 h的吸附作用,沸石对氨氮的吸附能力强于瓷质生化环,生化环48 h去氨氮的能力(95.1%)接近沸石(100%)。以沸石为滤料的滤器去氨氮能力与速率随沸石用量增加而增强。24 h内天然沸石吸附作用去氨氮能力强于生物沸石,生物沸石48 h对氨氮的去除率(99.2%)略超过天然沸石(95.2%)。

Effect of salinity and weight of filtering material on reducing ammonia-nitrogen of biomembrane

The ability for removing ammonia-nitrogen of biomembrane cultured in fresh water decreased gradually with increases in salinity and its rise velocity.When the salinity rose to 13.3,23.9 and 31.3 from 0.6 respectively and was steadied for 48 h,the removing rates of the ammonia-nitrogen of biomembrane were 100%,93.0% and 86.9% respectively.When the salinity reduced to 0.6 from 31.3 with different velocity,the ability of removing ammonia-nitrogen of biomembrane resumed basically to normal,and removing rate of ammonia-nitrogen reached over 90%.The ability for removing ammonia-nitrogen of zeolite by absorption for 24-36 h was stronger than that of porcelain biochemical ring.But by absorption for 48 h,removing rate(95.1%) of ammonia-nitrogen of the porcelain biochemical ring was close to that(100.0%) of zeolite.The removing rate(99.2%) of ammonia-nitrogen of biological zeolite for 48 h was slightly higher than that(95.2%) of natural zeolite.