一种农村生活污水流量在线监测新方法

流量是农村生活污水处理设施所需在线监测的重要运行参数之一。根据农村生活污水的导电特性，探索出了一种农村生活污水流量在线监测的新方法，该方法主要利用巴歇尔槽和基于污水导电性的液位计（CLG）实现流量的在线监测。巴歇尔槽可将流量数据测量转化为液位数据测量。CLG主要由测量电极和参比电极2部分组成，通过试验进一步确定CLG的最佳工艺设计条件为:400 Hz频率的交流电源供电条件下，测量电极和参比电极支路上均串联10 kΩ的电阻。经校正后，CLG平均相对误差为3.49%，测量误差中位数为0.3 cm，量程至少为2.1~19.2 cm。将由CLG和巴歇尔槽所构成的流量在线监测试验样机安装应用于实际发现，该样机与其他流量计所监测到的日流量数据均在0.01水平（双侧）上显著相关，说明该农村生活污水流量在线监测方法在实际应用中可实现流量的远程在线监测，具有可行性。

AN EXPLORATORY RESEARCH ON ONLINE MONITORING METHOD FOR RURAL DOMESTIC SEWAGE

Flow is one of the important indicators for online monitoring of rural sewage treatment facilities. Based on the conductive characteristics of rural domestic sewage, this study explored a new method for online monitoring the flow of rural domestic sewage. The designed online flow monitoring setup was mainly divided into two parts, a PAP metering tank and a conductivity level gauge (CLG). The PAP metering tank could convert the flow data measurement into liquid level data measurement. The CLG was made up by a measuring electrode and a reference electrode. The study found that the setup had the best performance when it was powered by a 400 Hz frequency AC source and branches of both the measuring electrode, and the reference electrode were connected in series with a 10 kΩ resistor. After laboratory calibration, the average relative error of the CLG could achieve 3.49%. The median measurement error was ±0.3 cm and the measurement range was 2.1~19.2 cm. After application of online flow monitoring setup, it was found that the daily flow data monitored by the prototype and other flow meters were significantly correlated at 0.01 level (both sides). Therefore, the method put forward by this study has good feasibility in actual application process and can realize remote online flow monitoring.