城镇污水处理厂总氮超标逻辑分析方法及应用

Logic analysis method and application of total nitrogen exceeding the standard in urban sewage treatment plant

基于脱氮原理及实际工程经验,建立了总氮(TN)超标逻辑分析方法,用于解决城镇污水处理厂出水TN无法稳定达到一级A标准的问题。该逻辑分析方法结合全流程检测和硝化潜力检测手段,可快速确定出水TN超标原因,并加快制定解决方案的进度。在水厂实际应用案例中,通过全流程检测发现,该厂出水TN超标的原因是缺氧池脱氮效率较低,从而导致出水硝态氮(NO3--N)较高。在结合TN超标逻辑分析方法后,该污水处理厂采取了关闭曝气沉砂池曝气系统、在厌氧池投加乙酸钠等调控措施,最终出水TN实现稳定达标排放。综上所述,总氮超标逻辑分析方法可有效解决实际生产过程中的出水TN超标问题,为城镇污水处理厂出水总氮达标排放提供参考。

Based on the denitrification principle and practical engineering experience,a logic analysis method of total nitrogen(TN) exceeding standard was established to deal with the problem that TN in the effluent of urban sewage treatment plant could not stably reach the first-class A level of national standard.The method combined the whole process monitoring and nitrification potential detection measures,could rapidly identify the reason for TN exceeding standard in the effluent,and accelerated the progress of developing solutions.In the case of practical application in urban sewage treatment plant,the whole process detection indicated that the reason for TN exceeding standard in the effluent was low denitrification efficiency in the anoxic tank,which results in high NO3- -N content in the effluent.After the combination with logic analysis method of TN exceeding standard,this urban sewage treatment plant adopted the regulating measurements of shutting down the aeration system in the aerated grit chamber and adding carbon source of sodium acetate in the anaerobic tank,and finally TN in the effluent reached the discharge standard.In summary,the logic analysis method of total nitrogen exceeding the standard can effectively solve the problem of TN exceeding,and provide a reference for the discharge of total nitrogen in the effluent of urban sewage treatment plants.