饮用水深度处理过程中臭氧化工艺运行优化理论与控制基础研究

Ozone-biological activated carbon process is the most widely used advanced drinking water treatment process. However, there are few fundamental studies on the theory and control for the operation optimization of ozonation process. Source water quality is highly affected by the upstream water quality, climate and weather conditions, and sudden pollution accidents. When raw water quality changes, how to adjust the ozone dosage in time to ensure ozonation efficiency and restrict bromate formation is a difficulty in operation optimization of ozonation process. This research proposal will focus on the ozone decay law and mechanism to reveal the effect of water quality on ozonation process. Based on the residual of ozone concentration (0.1mg/L~0.2mg/L) and the limited formation of bromate （<10μg/L）, the optimal value of CT (i.e. product of C and T, C the residual of ozone concentration, T the contact time of ozone and water) corresponding to the real-time water quality is dissicussed. On-line comprehensive evaluation of raw water quality and its application of feedforward control are considered. Thus the ozonation process can be quickly adjusted to the optimal value of CT corresponding to the real-time water quality. Model predictive feedback control is designed, and finally the compound control scheme of feedforward and feedback is proposed. The research of this proposal will not only contribute to develop and perfect the theory of operation optimization of ozonation process, but also provide the basis for the control design of operation optimization of ozonation process.

臭氧—生物活性炭工艺是应用最多的饮用水深度处理工艺，但鲜见有关于臭氧化工艺运行优化理论与控制基础的研究。水源水质受上游来水水质、气候及气象条件、突发污染事故的影响非常大。当原水水质变化时，如何实时调整臭氧投加量以保证臭氧化效能和控制溴酸盐生成是臭氧化工艺运行优化中的难点。本项目通过探究臭氧衰减规律及其机制，揭示水质对臭氧化工艺的影响；依据出水余臭氧浓度（0.1mg/L~0.2mg/L）和溴酸盐生成（<10μg/L）的限定，明确实时水质臭氧化CT（即C与T的乘积，C为水中余臭氧浓度，T为臭氧与水接触时间）优化值；探索原水水质在线综合评价及其前馈控制应用，以使臭氧化工艺快速调整至实时水质CT优化值运行；设计模型预测反馈控制，并最终提出臭氧投加系统的前馈—反馈复合控制方案。本项目的研究不仅有助于发展和完善臭氧化工艺运行优化理论，也可为臭氧化工艺运行优化控制设计提供依据。

臭氧—生物活性炭工艺运行优化理论与控制对深度处理过程出水水质的影响非常关键。本项目以pH值、水温、浑浊度、溶解氧、CODMn和氨氮为主要考虑的水质指标，探究了臭氧衰减规律及其机制，揭示了水质对臭氧化工艺的影响；依据出水余臭氧浓度（0.1mg/L~0.2mg/L）和溴酸盐生成（<10μg/L）的限定，明确了实时水质臭氧化CT优化值；探索了原水水质在线综合评价及其前馈控制应用，以使臭氧化工艺快速调整至实时水质CT优化值运行；设计了模型预测反馈控制，并最终提出了臭氧投加系统的前馈—反馈复合控制方案。本项目的研究对于臭氧—生物活性炭工艺的优化运行，尤其是在水源水质受上游来水水质、气候及气象条件、突发污染事故的影响下的臭氧—生物活性炭工艺稳定运行十分重要。