生物激活剂强化生物接触氧化的研究

研究了生物激活剂强化生物接触氧化修复污染较严重的地表水。试验结果表明HRT为2h，气水比6：1(V／V)时去除效果最佳，COD、NH3-N去除率分别达37．6%和81．6%。投加3mg／L BO、3mg／LNC后，最佳气水比时强化效果不明显．低气水比时投加BO、NC后COD的平均去除率分别达到42．7%和55．4%，比未投加提高了22．5%和35．2%，NH3-N平均去除率分别达到63．4%、88．3%，分别提高了20．3%和40．2%．未曝气时投加BO、NC后COD平均去除率分别提高到了30．0%和33．6%。说明在利用生物接触氧化修复污染水体时，同时采用生物激活剂能取得良好的强化效果。

STUDY ON BIOLOGICAL CONTACT OXIDATION AUGMENTED BY BIO-STIMULANTS

Remediation for severely polluted surface waters by biological contact oxidation with the present bio-stimulants was investigated. The results showed that removal effect was optimum under the conditions of 2h hydrolic retention time (HRT) and gas/water ratio of 6:1 and removal rate of COD and ammonia-nitrogen being 37.6% and 81.6% respectively. Bio-strengthening effect was not obvious under the condition of optimum gas/water ratio after adding 3mg/L BO or NC; Nevertheless, at low gas/water ratio, mean removal rates of COD reached to 42.7% and 55.4%, increasing by 22.5% and 35.2% respectively in comparison with that of blank, and mean removal rates of ammonia-nitrogen reached to 63.4% and 88.3%, increasing by 20.3% and 40.2% respectively in comparison with that of blank, after dosing 3mg/L BO or NC. In addition, after adding BO or NC, mean removal rates of COD increased to 30.0% and 33.6% without dosing. Bio-stimulants can achieve remarkable strengthening effect while remedying polluted waters with biological contact oxidation.