System and method for deeply treating sewage and recycling resin regeneration waste liquid

Abstract

The invention discloses a system and a method for deeply treating sewage and recycling resin regeneration waste liquid. The system comprises a biochemical pool, a settling pond, a powder activated carbon membrane biological reactor, a resin tank, a waste liquid collecting pool, a denitrification pool, a nitration pool and a sludge concentration pool. The method is characterized in that the incoming water of a sewage treatment plant is pre-treated and then enters the biochemical pool, thus the CODcr can be degraded under the effect of activated sludge; supernate flows into the powder activatedcarbon membrane biological reactor after settling, and thus pollutants can be further adsorbed through the powder activated carbon; chroma, suspension substances and CODcr are removed by interceptingthrough a membrane assembly; the water drained by the membrane is fed into the resin tank, and nitrate in the sewage can be removed under the adsorption effect of special nitrate ion exchange resin, and the clean water is directly drained; the resin regeneration waste liquid flows into the waste liquid collecting pool and is then fed into the denitrification pool for denitrification; the water subjected to denitrification flows into the nitration pool for nitration, thus ammonia nitrogen can be reduced, and CODcr can be degraded; the liquid subjected to nitration flows back to the denitrification pool; and the water drained by the nitration pool flows back to the biochemical pool at the front end, thus realizing the recycling of the resin regeneration waste liquid.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a system and method for recycling waste liquid, in particular to a system and method for advanced sewage treatment and resin regeneration waste liquid reuse. 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...

AI Technical Summary

Problems solved by technology

The macroporous denitrification resin adsorption method has mature technology, high denitrification efficiency, and high degree of automatic operation, but the saturated resin needs to be regenerated regularly, and the regeneration waste liquid contains relatively high concentrations of chloride ions and nitrate ions. The environment causes secondary pollution

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

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