反硝化生物滤池稳定运行的影响因素研究

STUDY ON THE RELATED FACTORS OF DENITRIFICATION BIOFILTER IN STEADY STATE

以高浓度硝氮废水为研究对象,考察反硝化生物滤池(DNBF)的启动情况以及稳定运行时饥饿时间、水力停留时间(HRT)和进水负荷对硝氮去除率的影响。结果表明:经过36 d的启动驯化后,DNBF对浓度为100 mg/L的硝氮去除率达90%以上;饥饿10 d后,DNBF重新启动13 d后可恢复到饥饿前的脱氮水平;进水硝氮浓度150 mg/L时,HRT从2 h增加到6 h后,硝氮去除率从48.8%升高到79.9%;而当进水负荷从0.59 kg/(m3·d)增加到3.28 kg/(m3·d)时,去除率基本稳定在81.4%。

At present,denitrification biofilter( DNBF) is generally used for treatment of low nitrate contaminated water. In this study,treatment of wastewater with high nitrate concentration by DNBF was researched. The effects of DNBF startup, starvation time,hydraulic retention time( HRT) and inlet nitrate load on nitrate nitrogen removal were examined. The results showed that after 36 d of startup of the DNBF,removal efficiency of more than 90% was achieved at the influent NO-3- N concentration of 100 mg / L,and the actual COD consumption and nitrate reduction ratio was 4. 23; After starvation for 10 d, another 13 d were needed to restore the nitrate removal efficiency. At the influent NO-3- N concentration of 150 mg / L and water temperature of 13 ℃,when HRT increased from 2 h to 6 h,the nitrate removal efficiency increased from 48. 8% to 79. 9%; However,when the nitrate inlet load rose from 0. 59 kg /( m3·d) to 3. 28 kg/( m3·d),its removal efficiency kept basically stable at the average of 81. 4%.