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研究论文

Application of DO, ORP and pH as on-line control parameters in a two-stage SBR process

摘要：介绍了在传统SBR脱氮工艺的基础上,开发的用于处理COD和氮浓度较高的工业废水的两段SBR系统(TSSBR).根据传统SBR工艺在反应过程中,当COD不再被降解,而硝化反应又没有开始时,DO迅速大幅度升高以及pH曲线上出现的拐点,可以将COD降解与硝化反应分割开,先后在不同的反应器内进行,分别命名为SBR1和SBR2,避免高COD浓度对硝化反应的冲击,提高处理效率.利用在线检测的DO、ORP和pH参数实时控制SBR1、SBR2各个生化过程的反应时间,解决了两段SBR系统的自动控制问题,可以使系统长期稳定运行,保证出水水质,节约能耗.采用实时控制策略,并控制系统温度在30℃左右,可将SBR2的硝化反应控制在亚硝酸型硝化结束.采用该工艺处理石化废水,COD去除率达到90%～95%,30℃时的比硝化反应速率达到0.3kg(NH₄-N)(kg(MLSS)·d).

Abstract：The application of a two-stage SBR (TSSBR) based on a single SBR nitrogen removal system for the treatment of a petrochemical industrial wastewater containing high COD and nitrogen concentration was studied. According to DO going up rapidly and the breakpoint on the pH curve at the removal of readily biodegradable substrate and nitrification transition in a single SBR nitrogen removal reactor, substrate degradation and nitrification could be divided and occurred sequentially in the different reactors, named as SBR1 and SBR2, respectively. In a TSSBR system, the negative impact of the higher influent COD on nitrification could be avoided and treatment efficiency improved because the heterotrophic bacteria for substrate degradation and autotrophic nitrifier existed in the different reactors. The problem of the automatic control for TSSBR process could be solved by using the on-line monitored DO, ORP and pH to real-time control the duration of the different biochemical reactions, which provided great process flexibility and stability, and saved the energy consumption. SBR2 nitrification was controlled to nitrite-type nitrification by using real-time control strategy and controlling wastewater temperature 30℃. Stable and high COD removal efficiency reached to 90%～95% and the specific nitrification rate at 30℃ was 0.3kg(NH₄-N)/(kg(MLSS)·d). Ammonia, nitrate and nitrite in the effluent were reduced to detection level.