DongYu,WangXiaodong,ZhuMing,et al.Virtual Sensor-based Ozone Dosing Control in Wastewater Treatment Plants[J].China Water & Wastewater,2026,42(17):90-97.
基于虚拟传感器的污水处理厂臭氧投加控制
- Title:
- Virtual Sensor-based Ozone Dosing Control in Wastewater Treatment Plants
- 摘要:
- 为应对污水深度处理和高品质再生水制备对化学需氧量（COD）的严格控制，臭氧氧化工艺被引入污水处理厂的深度处理过程。部分污水处理厂使用紫外光谱法监测臭氧接触池的COD浓度，但该方法无法检测饱和碳链有机物且易受硝酸盐氮干扰，因此不能直接用于臭氧氧化过程的自动化控制。为实现污水深度处理中臭氧氧化的过程控制，本研究基于生物池出水COD与在线监测仪表数据，构建虚拟监测模型，精准预测臭氧接触池进水COD浓度。采用生物池出水中COD浓度高于30 mg/L的水样进行臭氧氧化实验以确定氧碳比（O/C），基于实验数据与现场仪表数据构建线性判别分析（LDA）模型，用于对臭氧接触池进水进行分类，测试集准确率达到80.0%。最终，结合上述模型与臭氧发生器动态性能控制条件，形成了基于ON/OFF控制构架的臭氧氧化污水深度处理工艺控制系统，实现了对臭氧投加量的精确调控。
- Abstract:
- To comply with the stringent COD discharge limits imposed by advanced wastewater treatment and high-quality reclaimed water production, ozone oxidation has been adopted as a key unit process in the tertiary treatment stage. Although some wastewater treatment plants utilize UV spectrophotometry to monitor COD levels in the ozone contact tank, this technique fails to detect saturated carbon-chain organic compounds and is subject to interference from nitrate nitrogen, thus precluding its direct application in automated ozonation control. To achieve effective process control of ozone oxidation in advanced treatment, this study developed soft-sensor models that integrated effluent COD data from the biological reactor with online instrument measurements to accurately predict the influent COD concentration entering the ozone contact tank. Ozonation experiments were conducted on water samples with COD concentrations exceeding 30 mg/L collected from the biological reactor effluent, in order to determine the oxygen-to-carbon (O/C) ratio. Based on the experimental results and on-site instrument data, a linear discriminant analysis (LDA) model was constructed to classify the influent characteristics of the ozone contact tank, achieving a test set accuracy of 80.0%. Finally, by incorporating the established models with the dynamic performance constraints of the ozone generator, an ON/OFF control-based system was developed for the ozone oxidation process, enabling precise and reliable regulation of ozone dosage in advanced wastewater treatment.
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