复合生物反应器亚硝酸型同步硝化反硝化脱氮

摘要

Sequence hybrid biological reactor(SHBR)was proposed,and some key control parameters were in-vestigated for nitrogen removal from wastewater by simultaneous nitrification and denitrification(SND)via nitrite.sND via nitrite was achieved in SHBR by controlling demand oxygen(DO)concentration.There was a pro-did not destroy the partial nitrification to nitrite.The results showed that limited air flow rate to cause oxygen defi-ciency in the reactor would eventually induce only nitrification to nitrite and not further to nitrate.Nitrogen removal efficiency was increased with the increase in NAR,that iS,NAR was increased from 60%to 90%,and total nitrogen removal efficiency was increased from 68%t0 85%.The SHBR could tolerate high organic loading rate(OLR),COD and ammonia-nitrogen removal efficiency were greater than92%and 93.5%respectively and it even oper-biofilm positively affected the activated sludge settling capability,and sludge volume index(svi)of activated sludge in SHBR never hit more than 90 ml.g-1 throughout the experiments.