制药废水硝化-反硝化除氮研究

Reseach on Removal of Nitrogen in Pharmaceutical Wastewater by Nitrification Denitrification Process

含高浓度氮的制药废水经好氧生化处理后，虽然出水的ＣＯＤ、ＢＯＤ５均可达到行业排放标准，但ＴＮ仍高达约１７０ｍｇ／Ｌ。本研究在曝气池中设置填料，利用生物膜外层好氧、内层缺氧厌氧的条件，使硝化－反硝化脱氮在同一构筑物内进行，ＮＨ３－Ｎ和ＴＮ去除率分别可达约９０％和７０％。在本试验条件范围内，温度越高，负荷越低，硝化和反硝化作用越完全。

After aerobic biological treatment of pharmaceutical wastewater with high concentration nitrogen, effluent COD and BOD 5 could meet the discharge standards specific for pharmaceutic industry, but effluent TN was still as high as 170mg/L. In the experiment study, the aeration tank was reformed by installation of packing materials on which biofilm grew. Due to the aerobic and anaerobic environment occurred on outer and inner layers of the biofilm, nitrification and denitrification could carry out in a configuration, the removal efficencies of NH 3 N and TN reached 90% and 70% respectively. Under the experiment conditions, the higher temperature and lower loading resulted in better efficiencies of nitrification and denitrification with higher removal efficencies of NH 3 N and TN.