基于HPR在线监测控制SBR曝气历时实现短程脱氮

摘要

The hydrogen ion production rate (HPR) and the pH were measured by a novel automatically respirometric-titrimetric system, and shortcut nitrogen removal in an SBR was studied in the laboratory. An SBR was used to treat synthetic wastewater containing 360mg/L COD and 40mg/L NH4+-N at 20℃ with DO lower than 2.0mg/L. Controlling the aeration duration based on HPR online monitoring, shortcut nitrification-denitrification was successfully performed for approximately two months with a stable nitrite accumulation rate (NAR) above 88%, and the COD and NH4+-N removal ratios were both higher than 90%. Based on the HPR online monitoring data, the estimated NH4+-N concentrations in nitrification were closely related to the measured concentrations, with a correlation coefficient of 0.9722, and the estimated values were lower than the measured values mainly because of the titration delay at the beginning of the aeration phase.%应用新型自动呼吸-滴定测量仪在线测量 pH 值、HPR 等信号,进行了在 SBR 内实现短程脱氮的研究.采用 SBR 处理人工合成废水,COD和NH 4+-N浓度分别为360,40mg/L,温度稳定在20℃,DO低于2mg/L,基于HPR在线监测控制SBR曝气历时.运行约60d后,亚硝酸盐积累率达到88%,COD 和 NH 4+-N 去除率均在90%以上,稳定实现了短程硝化反硝化.应用 HPR 估计硝化过程的 NH 4+-N 浓度发现,NH 4+-N实测值与基于HPR的计算值间存在良好的线性关系,相关系数为0.9722；计算值整体低于实测值,主要是由曝气初期的滴定启动滞后所致.