V_E生产废水的短程硝化反硝化研究

SHORT-RANGE NITRIFICATION-DENITRIFICATION IN THE TREATMENT OF WASTEWATER FROM V_E PLANT

应用短程硝化 反硝化工艺在维生素E废水生物脱氮处理中的实验研究。结果表明 ,当溶解氧浓度为 0 85mg L时的亚硝化率 (NO-2 N NO-x N)为 18 9% ,远远 >溶解氧 2 6 5mg L时的 1 13% ;通过对回流污泥 12h的缺氧选择处理 ,出水中的NO-2 由原来的 2 5mg L上升到 2 5 6mg L ,相应的污泥中亚硝化细菌与硝化细菌的数量比值由 0 4 5提高到 2 4 4 ;在进水中投加 5～ 10mg L的ClO-3能够使污泥中硝酸细菌的活性受到明显抑制 ,但污泥中硝酸细菌的数量却增加了。在停止向进水中投加氯酸根离子后硝酸细菌活性可以缓慢恢复 ,15d后系统的亚硝化率稳定在 5 5 %～ 5 8%。

Short-range nitrification-denitrifcation technique was employed to increase the nitrification efficiency in the biodenitrification of wastewater from vitamin E plant.The results showed that the nitrosation rate(NO 2-N/NO x-N) was 18.9% under the condition of dissolved oxygen being 0.85 mg/L;however,the rate was only 1.13% with the dissolved oxygen being 26.65mg/L.The concentration of NO - 2 of the effluent was increased from 2.5 mg/L to 25.6 mg/L through 12 hours of anaerobic treatment of recycling sludge,and the ratio between the number of nitrite bacteria and nitrate bacteria in the sludge was also increased (from 0.45 to 2.44).The addition of 5～10 mg/L ClO - 3 to the influent could effectively inhibit the activity of nitrite bacteria,but their number was increased remarkably;their activity could be recovered slowly upon the stop of addition and the system could regain and maintain a nitrosation rate of 55%～58% after 15 days of continuous operation.