AAO工艺大型城市污水处理厂春节期间脱氮优化技术  

Optimized Technology of AAO Process for Denitrification in Large Urban WWTP during the Spring Festival

作　　者：和笑天 王宏武 李鹏飞 杨丽亚 张潇 HE Xiaotian;WANG Hongwu;LI Pengfei;YANG Liya;ZHANG Xiao(Central Plain Environmental Protection Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]中原环保股份有限公司,河南郑州450000

出　　处：《净水技术》2025年第2期208-215,共8页Water Purification Technology

摘　　要：【目的】为探索并解决城镇污水处理厂在春节假期期间因进水化学需氧量(COD_(Cr))、碳氮比、进水水量等降低而造成污水处理厂出水总氮逐步升高甚至超标的问题。【方法】文章通过分析城镇污水处理厂春节假期前后的进水水量水质的变化规律,对比了延长生物池缺氧段停留时间、外加碳源、停运生物池增加其他生物池进水负荷、减少初沉池排泥或超越初沉池增加进水碳源等措施的实施效果及优缺点,提出了在拥有多条生产线的污水处理厂,可选择一个或多个生物池进行交替运行进行生物脱氮的方法,即通过选择一个或者多个生物池停止进水12 h,再恢复进水12 h的方法,将停止进水的生物池因内回流循环的作用而可以充分利用生物池内的各种碳源进行反硝化。【结果】通过上述措施,该停止进水的生物池内存水的总氮可降低4~5 mg/L,当再次投运该停止运行的生物池后约12 h,该系列生物池池内总氮开始出现反弹升高的现象,通过各条生产线出水相互混合作用,进而延缓出水总氮整体的升高。【结论】经过多次工程试验验证,得出以下结论:在春节假期期间,拥有多条生产线的污水处理厂采用交替运行一个或者多个生物池的方法,不仅可有效控制总出水的总氮指标的恶化,整体降低出水总氮指标,还节省了用电、药剂等生产成本费用。[Objective]To explore and solve the problem of gradually increasing or even exceeding the total nitrogen concentration in the effluent from urban wastewater treatment plants(WWTPs)during Spring Festival holiday,due to the decrease in influent chemical oxygen demand(COD_(Cr)),carbon-nitrogen ratio,and influent flow.[Methods]This paper analyzed the influent flow and water quality of urban WWTPs before and after the Spring Festival holiday,and compared the implementation effects and advantages and disadvantages measures such as extending the anoxic section's detention time in the bioreactor,adding external carbon sources,stopping the operation of the bioreactor to increase influent load of other bioreactors,reducing the sludge discharge from the primary sedimentation tank or bypassing the primary sedimentation tank to increase the influent carbon source.It proposed a method of alternating operation of one or more bioreactors in WWTPs with multiple production lines thus stopping the inflment for 12 hours and then resuming it for 12 hours,so that the bioreactors with stopped influent could fully utilize the various carbon in the bioreactor for denitrification due to the internal recirculation.[Results]By using the above measures,the total nitrogen in the water in the bioreactors with stopped influent could be reduced by 4~5 mg/L.When the stopped bioreactors were put back into operation after 12 hours,the total nitrogen in the bioreactors began to rebound.By mixing the effluent from different production lines,the overall increase in the nitrogen of the effluent could be delayed.[Conclusion]After multiple engineering trials,the following conclusion is drawn:During the Spring Festival holiday,urban WWTP with multiple production lines can not only effectively control the deterioration of the total nitrogen in the effluent but also reduce the overall total nitrogen in the effluent by alternating operation of one or more bioreactors.This method also saves on electricity and chemical costs.

关 键 词：春节假期期间 碳氮比低 交替运行生物池 出水总氮降低 节省生产成本 

分 类 号：TU992[建筑科学—市政工程]