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Advanced Treatment and Reuse Technology for Biological Effluent from Industrial Park Sewage Treatment Plants 【Technical Content】To address the issue of biological effluent from industrial park sewage treatment plants failing to meet discharge standards, an integrated treatment process centered on magnetic renewable resin adsorbents has been developed. By utilizing high-performance fully mixed reactors, this approach can reliably meet the requirements for improved water quality and reuse. 【Application Scope】Advanced treatment and reuse of biochemical wastewater from industrial park sewage treatment plants 【Related Theme】Rivers 【Technical Development Stage】Engineering demonstration. Given the difficulties in treating biochemical wastewater from industrial parks and the low rate of reuse, a new advanced purification technology for such wastewater is employed, based on magnetic renewable resin adsorbents; meanwhile, new equipment featuring high-speed hydraulic circulation and integrated resin reactors is used. The removal rates for COD, TN, and TP can reach 50%-60%, 30%-45%, and 40%-55%, respectively, with a decolorization rate of over 90%. Process Flow: The treatment process specified in this plan is an integrated process that combines magnetic renewable resin adsorbents with coagulation and filtration. By combining magnetic renewable resin adsorbents with conventional coagulation and sedimentation processes, it is possible to leverage the advantages of each method while mitigating their disadvantages, thus making full use of the strengths of both magnetic renewable resin adsorbents and traditional coagulation and sedimentation techniques. Magnetic renewable resin adsorbents can effectively remove hydrophobic acids from water; they not only reduce the processing load in subsequent coagulation and sedimentation steps but also enhance the flocculation properties of the flocs formed, thereby improving the efficiency of coagulation treatment. At the same time, coagulation sedimentation can remove large-molecule organic pollutants from wastewater, further reducing the turbidity of the effluent. The integrated process of this magnetic renewable resin adsorbent and coagulation sedimentation features improved simplicity, easy operation, low investment, and low operating costs. Key Technology 1: Preparation technology of new renewable magnetic resin ； Magnetic acrylic strong-base anion exchange resins suitable for the advanced treatment of industrial wastewater have achieved innovative technological breakthroughs in terms of synthetic raw materials and technologies, as well as product structure and performance. The magnetic acrylic strong-base anion exchange resin (NDMP) suitable for the advanced treatment of industrial wastewater contains iron oxide doped during its synthesis, giving it a needle-shaped Fe2O3 structure on its surface ； An organic pore-forming agent was also added, resulting in a larger average particle size (6.68 nm) ； Additionally, this product has strong permanent magnetism, making it suitable for the removal of pollutants with higher molecular weights. Therefore, this product still exhibits excellent advanced purification capabilities even under conditions of high COD in biochemical wastewater. 2. New renewable magnetic resin adsorption and separation technology. This process mainly consists of a reaction system, a regeneration system, and a desorption liquid disposal system. The operating parameters of the reaction system are as follows: the volume ratio of resin to wastewater in the reaction tank is 1/200–1/400, the reaction time in the reaction tank is 30 minutes, the retention time in the sedimentation tank is 20 minutes, and the resin recirculation rate is 10%–20% ； The operating parameters of the regeneration system are as follows: the regenerant is a NaCl solution with a mass percentage of 15%-20%, and the regeneration time is 30 minutes ； The operating parameters of the desorption liquid treatment system are as follows: the MWCO of the membrane module in the separation system is 200Da–300Da, and the residence time in the catalytic degradation reactor is 2 hours. 【Technical Origin and Intellectual Property Overview】Developed independently. 【Application Examples】Applying entity: Zhengzhou Jinzhou Water Services Co., Ltd. Introduction to actual application example: A new demonstration project for the advanced treatment and reuse of biochemical wastewater using magnetic resin was established in this model enterprise. The designed capacity is 3,000 m3/d. The main parameter for the influent water is COD ≤ 100 mg/L, while the main parameters for the effluent water meet the requirements of Grade A Standard 1 of GB 18918-2002 (i.e., COD ≤ 50 mg/L). The demonstration project has significantly reduced the amount of pollutants released into the environment, which is of great importance for improving the water quality in the surrounding area; it brings notable environmental and social benefits.