有机物去除的臭氧混凝互促增效机制及在再生水深度处理中的应用

Aiming at removing the residual organic matter in secondary effluent of municipal sewage with high efficiency, this study is going to analyze the chemical constitution and structural form of organic matter to define the characteristics of organic matter coagulation treatment based on the Dispersed ozone floatation integrative process feature. The reaction rule of coagulation for metal coagulant and organic matter will be mastered; the interaction mechanism for metal salt coagulant and ozone, as well as the effect of metal coagulant in treatment process will be defined. The function characteristics of multicomponent system of organic matter, ozone and metal salt will be studied to control the oxidation reaction path of organic matter in the integrative process and to improve the carboxyl and carboxylation ratio in cyclic organic pollutants. Besides, ring opening and chain scission of organic matter will be restrained to improve the coagulation of organic matter and to realize the mutual promotion between oxidation and coagulation of organic matter. The influence mechanism of ozone volume on organic matter oxidation and hydrophobic grouping will be confirmed. The conditioning of the physicochemical property on flocculating constituent surface and the regulation method of flocculating constituent dimension proper for air floatation will be explored. In addition, the theoretical model and technique for regulating the integrative sewage recycling process of Dispersed ozone floatation will be shaped to achieve high efficient sewage recycling and safety insurance of water quality. The study result will not only have significance in terms of theory, but also provide reliable basis for the optimization of sewage recycling process as well as for the rational contorl of pollutant. All in all, great practical value will be achieved.

针对城市污水二级处理水中残余有机物的高效去除问题，解析有机物的化学组成及其构造形态，明确有机物的可混凝处理特征；基于微气泡臭氧-混凝-气浮一体化工艺特征，掌握金属混凝剂与水中有机物的混凝反应规律，探明金属盐与臭氧的相互作用机理及其在工艺中的作用轨迹；研究有机物、臭氧、金属盐多元体系的作用特点，控制一体化工艺过程中有机物的氧化途径，提高环状类有机污染物的羧基、羟基化比例，并抑制有机物开环断链以达到改善有机物可混凝性的目的，实现有机物氧化和混凝的互促增效；明确臭氧投量对有机物氧化效果与疏水基团形成的影响机理，探索絮凝体表面物化特性调理以及适于气浮的絮凝体尺度调控方法，形成微气泡臭氧-混凝-气浮一体化污水再生工艺调控的理论模型和技术方法，从而实现污水再生利用的高效与水质安全保障。研究成果不仅在理论上有重要意义，而且对污水再生利用工艺的优化和污染物的合理控制也将提供可靠依据，具有广阔的实用价值。

污水厂二级处理水中存在较高浓度的残余有机物以及复杂的污染物种类，使得常规混凝-沉淀-过滤工艺在污水深度处理和再生利用过程中的局限性日益凸显。本项目针对污水厂二级出水溶解性有机物高效去除的问题，分析表征了城市污水处理厂二级出水溶解性有机物的特性，研究了臭氧与二级出水难凝聚有机物的化学反应过程，探讨了臭氧预氧化对常规混凝工艺效果的影响，建立了臭氧混凝互促增效反应体系，并深入研究了臭氧混凝互促增效体系的反应机理，研发了基于臭氧混凝增效机制的微气泡臭氧气浮一体化工艺，探明了臭氧气浮工艺中絮体特性调控机制，并将其应用于污水深度处理中，研究结果对于丰富污水深度处理工艺和强化污水再生利用效率提供了理论依据与应用基础。. 在项目的资助下已发表学术论文15篇，其中英文SCI期刊源论文5篇（一区论文2篇），EI期刊论文4篇，授权国家发明专利4项，新申请国家发明专利17项，撰写专著1部（已与科学出版社签订协议，预计2018年4月份出版），培养硕、博士研究生9名，其中4名已经毕业。同时，参加了4次国际学术会议和2次国内学术会议，进行了口头报告或展板展示，项目成果也成功推广应用于城市污水与工业废水的资源化利用工程中。