System and method for treating and recycling regenerative waste liquid of macroporous denitrification resin

Abstract

The invention discloses a system and a method for treating and recycling regenerative waste liquid of macroporous denitrification resin. The system comprises a resin adsorption tank, a sodium chloridedosing tank, a waste liquid pool, a denitrification pool, a MBR (membrane bio-reactor), a recycling water tank, a nano-filtration membrane assembly, a reverse osmosis membrane assembly and a sodium hypochlorite generator; a macroporous denitrification resin adsorption technology is adopted to treat and send tail water in a sewage plant to the resin adsorption tank, a sodium chloride solution is utilized to regenerate, the regenerative waste liquid is collected into the waste liquid pool firstly, then enters the denitrification pool, followingly enters the MBR, and effluent flows back into therecycling water tank; the effluent is conveyed to the nano-filtration membrane assembly, and used for preparation of new resin regenerative liquid, concentrated water is partially drained out with the effluent in the resin adsorption tank, the rest concentrated water enters the reverse osmosis membrane assembly to be treated further, 98% and above dissoluble salt is retained, the produced water is directly drained out, the concentrated water directly enters the sodium hypochlorite generator to be electrolyzed, a disinfector is generated to disinfect and sterilize the effluent of the resin adsorption tank, and treatment and recycling of the regenerative waste liquid of the macroporous denitrification resin are achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a system and method for treating and reusing macroporous denitrification resin regeneration waste liquid. Background technique [0002] Sewage discharge is an inevitable product of the development of today's society. Urban sewage treatment plants usually adopt physical and biochemical treatment methods, and the total nitrogen content in the tail water is still high. In order to achieve sustainable development of resources, it is necessary to dispose of such sewage It can be discharged into rivers, lakes and other water bodies only if the index of each item falls below the limit value. However, the current discharge standards have strict requirements on the content of total nitrogen, and it is difficult for some conventional processes to ensure that the nitrate nitrogen in the discharged water fully meets the standard. [0003] The resin adsorption ion exchan...

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Problems solved by technology

However, the current discharge standards have strict requirements on the content of total nitrogen, and some conventional processes are difficult to ensure that the nitrate nitrogen in the discharged water is completely up to the standard

[0003] The resin adsorption ion exchange denitrification method has the characteristics of mature technology, simple equipment, convenient operation and management, high degree of nitrate removal, and low operating cost. The ion exchange method is used to treat sewage containing a certain concentration of nitrate nitrogen. The saturated ion exchange resin usually Sodium chloride solution with a mass fraction of 5% to 8% is used for regeneration. The waste liquid generated during the regeneration process contains high concentrations of chloride ions and nitrate ions, so it cannot be discharged directly, which may cause secondary pollution, but it is very dangerous. intractable

If the disposal problem of ion exchange resin regeneration waste liquid cannot be effectively solved, the resin ion exchange method will be difficult to popularize and apply in the field of sewage denitrification

[0004] If only physical methods such as electrodialysis, reverse osmosis, etc. are used to treat nitrogen-containing regeneration waste liquid under high salt concentration, there will be problems such as high pre-treatment requirements, high salinity of concentrated water, and secondary pollution caused by high salinity; using chemical methods It is to use reducing agent to reduce nitrate in water to remove nitrate, but the reaction conditions are strictly controlled, and the by-products are easy to cause secondary pollution; if traditional biochemical methods are used, most microorganisms are difficult to survive under high salinity conditions without domestication , resulting in poor denitrification effect

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