再生水中氮磷在循环冷却系统内的迁移转化机制及资源化途径

It is an important measure that reclaimed-water is used as industrial circulating cooling water. In general, N and P in the reclaimed water are considered to be responsible for scaling, corrosion and biological growth in recirculating cooling system. But in the latest research achievements, some forms of N and P can be useful to the safe operation of the system. Based on the contradictory views above, converting the forms of N and P in the reclaimed water to make them useful in decreasing scaling, corrosion and biofouling in the system is proposed creatively in the project. Firstly, it is necessary to study the transformation of the NH3+-N and determine the factors to the transformation in the system. The concentration and the nitrification ratio of NH3+-N which can mitigate scale and scarcely cause corrosion in the system will be determined during the study. The scale-inhibition mechanism of NH3+-N will be clarified. Secondly, the transformation of P in the reclaimed water will be investigated in the system. The content and the forms of P which can migrate to the metal surface to form a dense film to protect the system from corrosion will be determined. The mechanism and the approach of P corrosion inhibition will be established. The success of this project will provide important theoretical supports for the new recycling ways of N and P in reclaimed water.

再生水用作工业循环冷却水是重要的节水措施，传统认为再生水中氮、磷是引起系统结垢、腐蚀和微生物滋生等问题的重要因素，最新研究结果表明，某些形态氮、磷可能有益于系统的安全运行。基于上述矛盾观点，本项目开创性提出转化再生水中氮、磷形态使之利于缓解系统的结垢、腐蚀和微生物滋生的新构想。首先，通过研究系统中氨氮的转化规律及影响因素，确定不易引起腐蚀而缓解结垢的氨氮含量和硝化率，阐明氨氮阻垢的资源化机制；再考察再生水中无机磷在系统内的迁移转化规律，探明能够迁移到金属表面形成致密薄膜从而缓解腐蚀的磷含量和磷酸盐结合态，建立无机磷缓蚀的资源化途径和机制；本项目的成功研究将为再生水中氮、磷资源化的新途径提供重要的理论支持。

再生水用作工业循环冷却水是重要的节水措施，但再生水中氮、磷是引起系统结垢、腐蚀和微生物滋生等问题的重要因素，本项目优化了氮磷在循环冷却系统中的提取方法，提出适用于循环冷却水中无机磷提取的M-SMT法，将有机磷的分级提取lvanoff法应用于循环冷却系统并加以优化改进，正视循环冷却系统内沉积物中氮的影响并优化出分级提取方法，氮磷提取体系的建立，为准确分析氮磷的不同赋存形态，进一步研究其转化规律打下基础；研究了磷的不同形态及迁移转化对系统腐蚀和结垢的作用机制，探明了能够迁移到金属表面形成致密薄膜从而缓解腐蚀的磷含量和磷酸盐结合态，建立无机磷和有机磷缓蚀的资源化途径和机制；研究了水质条件和运行条件对氨氮转化的影响和不同形态的氮对循环冷却系统的作用机制，确定不易引起腐蚀而缓解结垢的氨氮含量和硝化率，阐明氨氮阻垢的资源化机制；通过改变再生水中氮磷的配比情况，初步研究不同比例的氮磷对循环冷却系统中微生物构成的影响，从而为构建理想的生物构成奠定基础；通过软件模拟水相和垢层中盐类的具体存在形态和含量，预测分析成垢趋势及条件规律，从而为更好的控制结垢和药剂的高效利用提供理论支持。