序批式生物反应器工艺脱氮除磷过程控制参数

Control Parameters for Removal of Nitrogen and Phosphorus in Sequencing Batch Reactor

为了实现序批式生物反应器(SBR)的自动控制,利用SBR工艺厌氧-好氧-缺氧(AOA)的运行方式处理模拟废水,考察溶解氧(DO)、p H值及氧化还原电位(ORP)作为各反应阶段终止(包括厌氧释磷、好氧硝化、曝气、好氧吸磷和缺氧反硝化)控制参数的可行性。结果表明:厌氧段,p H值与ORP曲线下降至平台的转折点对应厌氧释磷的终点;好氧段,p H值曲线的最低点对应硝化作用的终点,p H值、DO与ORP在硝化结束后均上升至一个稳定的平台,三者结合来判断曝气时间的结束以及好氧吸磷的终点;缺氧段,ORP曲线的最低点对应反硝化作用的终点。DO,p H值与ORP的特征点可以作为SBR工艺脱氮除磷的过程控制参数。

In order to realize automatic control of sequencing batch reactor（SBR）, the feasibility of employing dissolved oxygen（DO）, p H value and oxidation reduction potential（ORP） as the controlling parameters for the termination of different reaction stages, which included phosphorus release under anaerobic condition, nitrification under aerobic condition, aeration and phosphorus uptake under aerobic condition and denitrification under anoxic conditions, were investigated by treating synthetic wastewater in an anaerobic/aerobic/anoxic（AOA） SBR. The results showed that the turning point of p H value and ORP profiles was corresponding to the termination of phosphorus release in anaerobic stage. The lowest point of p H profile was corresponding to the termination of nitrification in aerobic and DO, p H value and ORP increased to stable levels after nitrification. The combination of DO, p H value and ORP could be used to estimate the termination of aeration time and phosphorus uptake in aerobic stage. The lowest point of ORP profile was corresponding to the termination of denitrification in anoxic. The characteristic points of DO, p H value and ORP could be used as the process control parameters for the nitrogen and phosphorus removal in SBR.