This project belongs to the discipline of environmental science and technology mdash; water pollution prevention and control engineering. With the improvement of my country's emission standards, traditional biological treatment processes are no longer able to meet the requirements, and the advanced treatment of industrial wastewater is imperative. Advanced oxidation methods are the most promising advanced treatment technology, but there are few types and lack engineering practice. Fenton's method (also known as ldquo;Fenton's reagent rdquo;) is the most well-known advanced oxidation method. It has a history of more than 100 years and occupies an important position in chemical and environmental sciences. However, it has only been used for large-scale advanced wastewater treatment for about ten years, and problems have arisen in practice: 1. The Fenton reaction conditions are highly acidic and oxidizing, which seriously corrodes the equipment;2. The Fenton method produces a large amount of mud, which is traditional. 3 of biological method~5 times, and has no calorific value, making it difficult to use heat treatment. The cost of iron mud treatment is often greater than the cost of wastewater treatment, which has become a bottleneck problem in the promotion and application of Fenton method. Under the tight task of upgrading and renovating the country's largest industrial wastewater treatment plant, the project team conducted theoretical foundation and process conditions in conjunction with the National Science and Technology Support Plan topic ldquo; R & D and Industrialization of Iron-based Composite Water Treatment Materials (2013 BAC01B001). Experimental studies show that Fenton's homogeneous catalytic reaction speed is extremely fast, and the life span of the active species bull;OH produced is extremely short. Based on this feature, a static pipe mixer is used to provide strong turbulence and the Fenton method pipe reactor is designed, thereby improving the reaction efficiency and greatly reducing the volume of the reactor. By advanced oxidation mechanism: first bull;OH is activated to produce organic free radicals, and then organic compounds are oxidized and degraded by molecular O2. Therefore, oxygenation can strengthen the oxidation reaction. Therefore, a new Fenton combined reaction system mdash; ldquo; pipeline reactor + air flotation separationrdquo; was developed, using the original air flotation tank as the successor unit of the pipeline reactor. On the one hand, it continues the advanced oxidation reaction during the release of dissolved oxygen and makes up for the lack of residence time in the pipeline reactor; on the other hand, it maintains the original separation function of the air flotation tank. After local adjustment of operating parameters and equipment, the air flotation tank is more suitable for the separation of high-concentration fine iron mud. 2. The formation process of iron mud was comprehensively studied and it was found that the Fenton reaction formed Schindite in the oxidation stage, and hydromagnetite in the neutralization stage, and the two gradually transformed into stable fibrosite and goethite; The changes in the composition and crystal form of iron mud were studied through material characterization methods, revealing the transformation laws of iron mud in the entire Fenton process. Based on this, a resource path for iron mud was developed, and technical routes were obtained as a catalyst for catalytic ozone, an adsorbent for phosphorus in water, and a cement raw material. The results achieved: 1. Using a static mixer as a Fenton process reactor, shortening the hydraulic retention time of a Fenton reactor that is usually longer than 15 minutes to about 15 seconds. The original air flotation tank is used as a combined unit of the Fenton process, and the dosing system optimizes the dosing of various chemicals, with a project scale of 600,000 tons/day. Over the past three years, a total of 123.63 million yuan has been saved in renovation investment and sewage treatment costs (excluding savings in sludge treatment costs). 2. A new way for large-scale resource utilization of Fenton iron mud has been opened up; mdash; iron-rich raw materials for the production of high-quality cement, with a scale of about 1000 tons/day (moisture content of 80%), making all iron mud a valuable industrial raw material. As a result, an additional output value of 160.51 million yuan has been added in the past three years, saving a total of 190.6 million yuan in sludge treatment, iron ore mining and other expenses. During the research process, 16 authorized patents were formed, including 10 invention patents, and 11 SCI/EI papers were published. It is confirmed by the "Level Search Report" that the scale of new process sewage treatment as an advanced oxidation method and the scale of resource utilization of solid waste as industrial raw materials far exceed and are superior to the level of other similar projects. The "Achievement Evaluation Certificate" of the evaluation agency believes that the first item has reached the international leading level and the second item has reached the international advanced level.