System and method for deeply treating tail water of sewage plant

Abstract

The invention discloses a system and a method for deeply treating tail water of a sewage plant. The system comprises a high-density settlement tank, a powder activated carbon membrane reactor, a resinadsorption tank, a clear water tank, a waste liquid collection tank, a denitrification tank, an MBR tank, a sludge concentration tank, a plate and frame filter press, and an electric control system.Raw water enters the high-density settlement tank at first so as to remove total phosphorus, then the water is sent to the powder activated carbon membrane reactor, powder activated carbon is added toadsorb pollutants, the water is filtered through a membrane component so as to reduce CODcr, color scale and suspended matters of effluent water, then the effluent water is sent to the resin adsorption tank to remove nitrogen, the effluent water flows into the clear water tank, is sterilized and then is discharged, after being saturated through absorption, the resin is regenerated through a sodium chloride solution, the waste liquid is collected and then sent to the denitrification tank to remove nitrogen, some carbon paste in the powder activated carbon membrane reactor in the previous stageflows back to the denitrification tank, so as to enable pollutants to be further adsorbed to improve water quality, then the effluent water enters the MBR to separate sludge from water. Through adoption of the system, the water quality is stable, the effluent water contains low content of nitrogen and phosphorus; and the system occupies a small area and has high automation degree.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a sewage treatment system and method, in particular to a sewage treatment plant tail water advanced treatment system and method. Background technique [0002] With the development of urban construction and industry, the amount of domestic sewage and industrial wastewater is also increasing. Most of the sewage treatment plants in my country routinely use biochemical processes to treat sewage. Although the effluent can reach the first-class A or first-class B standard, the residual pollutants in the tail water such as COD, BOD, SS, ammonia nitrogen, total nitrogen (TN), and total Phosphorus (TP) and other trace pollutants have great hidden dangers to human health and the surrounding environment. In order to eliminate these pollutants to the greatest extent, and in response to the more stringent sewage discharge policy issued by the country, it is urgent to research and devel...

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Problems solved by technology

[0006] The resin adsorption denitrification method has mature technology, high denitrification efficiency, and high degree of automatic operation, but the saturated resin needs to be regenerated regularly, and the regenerated waste liquid contains high concentrations of chloride ions and nitrate ions. If it is not treated in time, it will cause serious damage to the environment. Secondary pollution

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