Wastewater treatment method and wastewater treatment system

Abstract

The invention discloses a wastewater treatment method and a wastewater treatment system. The wastewater treatment method disclosed by the invention comprises the following steps: biological treatment, magnetic ion exchange resin adsorption, ultrafiltration treatment, reverse osmosis treatment, regeneration, regenerated resin return, electrolytic oxidation and nano-filter membrane treatment. According to the wastewater treatment method disclosed by the invention, since the magnetic ion exchange resin is utilized to adsorb the organic substances in the ultrafiltration influent water, the organic content in the ultrafiltration and reverse osmosis is greatly lowered, and the concentrated water of reverse osmosis can be directly discharged after reaching the discharge standard; and meanwhile, the organic pollution of the reverse osmosis membrane at the concentrated water side is reduced, so that the continuous operation period of the reverse osmosis becomes longer. In addition, since the magnetic ion exchange resin can be regenerated on line and recycled, the cost is lowered, and other concentrated water in the system can be totally treated without secondary pollution.

Description

technical field [0001] The invention relates to a wastewater treatment method and a wastewater treatment system, in particular to an advanced treatment method and a wastewater treatment system for refinery, chemical and coal chemical wastewater. Background technique [0002] In the industrial wastewater reuse projects of oil refining, chemical industry and coal chemical industry, the influent water of the reuse water device is generally the discharge wastewater that meets the standard of the sewage treatment plant, the circulating water sewage and / or the clean water of the factory, and the destination of the reuse water is generally used as circulating cooling water make-up water or boiler make-up water. When the salt content in the influent water of the recycling water plant is high, in order to meet the standard of making-up water for circulating cooling water or boiler make-up water, it is necessary to use reverse osmosis process to remove inorganic salts in wastewater. ...

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Problems solved by technology

However, the following problems exist in the use of ozone oxidation: 1) ozone oxidation only changes macromolecular organics into small molecular organics, and further treatment is required after oxidation; 2) when the organic content in water is extremely low, the effect of ozone oxidation is better, However, due to the complex composition of water quality, especially industrial wastewater contains a large amount of easily oxidizable substances, such as ammonia nitrogen, etc., when ozone is added to this water body, these substances quickly consume a large amount of ozone, and ozone in gas and water The concentration of ozone is limited, which leads to poor effect of ozone in practical application and affects the recycling rate of wastewater; 3) the production efficiency of ozone is low, and when the amount of ozone required is large, the equipment and operating costs are expensive; 4) ozone generating equipment and process Leakage is prone to occur in actual operation. Although exhaust gas absorption technology is mostly used, it still poses a threat to the health of the operator. Therefore, its application is limited.

[0006] Another commonly used method for removing organic matter is activated carbon adsorption, but the adsorption capacity of activated carbon for organic matter is limited, and the adsorption performance decreases after a period of use, which makes the recycling rate of wastewater low. It will cause secondary pollution and increase the treatment cost; if it is regenerated, the regeneration conditions required are harsh, and it is difficult to regenerate online. It needs to be unloaded from the equipment and transported to a special regeneration plant. The operation is complicated, the transportation and regeneration costs are high, and activated carbon filtration Equipment occupies a large area, etc.

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