A treatment process for zero discharge and resource recycling of catalyst wastewater

Abstract

The invention relates to a treatment process for realizing zero emission and resource recycling of catalyst wastewater. The integrated process system mainly comprises a high-efficiency softening silicon removal system, a medium filtration system, an ultrafiltration system, an ion exchange system, a nanofiltration system, a nitrate separating membrane system, a reverse osmosis system, an electrodialysis system, a deamination and evaporative crystallization system and a nitrate co-production and evaporative crystallization system. The treatment process is used for treating comprehensive wastewater with high ammonia nitrogen high-silicon high-salt characteristics discharged in the catalyst production and preparation process, the problems that silicon dioxide is high in content and difficult to remove, the crystalline salt quality is low, the salt impurity amount is large and the like are effectively solved, water used in a catalyst production process, a sodium chloride product and a sodium sulfate product are finally formed, and the aim of achieving zero emission and recycling of the wastewater after treatment is effectively achieved.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment process for realizing zero discharge and recycling of comprehensive waste water with high ammonia nitrogen, high silicon and high salt characteristics discharged during the catalyst production process. Background technique [0002] Catalysts are widely used in petroleum processing, chemical fertilizer industry, chemical synthesis, polymer material preparation, environmental protection and other industries. The development and innovation of catalysts will promote the development of industry and generate huge social and economic benefits. my country attaches great importance to the development of catalyst production technology, and has a certain production scale. However, a large amount of wastewater will be discharged during the catalyst production process, which will not only pollute the environment, but also cause a lot of waste of resources. Theref...

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Problems solved by technology

[0010] (1) Biological method (A / O, A 2 / O, oxidation ditch, improved SBR, short-range nitrification and denitrification, etc.) and other processes to remove ammonia nitrogen and then discharge directly. Due to the serious imbalance of C / N ratio in wastewater, carbon sources are usually added to increase biodegradability, which often results in high operating costs. , the total nitrogen in the product water is not up to the standard;

[0011] (2) Use physical and chemical methods (adsorption, ion exchange, oxidation, stripping, etc.) or thermal methods to remove ammonia nitrogen and then discharge them directly, or mix such wastewater with high-concentration organic wastewater through physical methods (flocculation sedimentation) and biological Directly discharged after the coupling treatment of the method, although the treatment process can meet the standard discharge in the early stage, but with the increasingly stringent environmental protection discharge standards (especially the control of the salt content index in the discharged wastewater) and the control of water resources by enterprises and The continuous strengthening of management has highlighted the shortcomings of existing processes that cannot meet the new discharge standards and waste a lot of water resources;

[0012] (3) After removing suspended solids, silicon, ammonia nitrogen and other pollutants, it is then concentrated by reverse osmosis membrane and evaporated and crystallized. Although this type of process can basically achieve zero discharge of wastewater, the evaporation of the entire process is relatively large, and the evaporation investment The cost is high, and a large amount of miscellaneous salt will eventually be formed, which will increase the burden on enterprises to deal with solid or hazardous waste

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