Advanced treatment process of biochemical tail water of percolate of city consumption residue

Abstract

The invention discloses an advanced treatment method for biochemical tail water of leachate of municipal household waste. Tail water mainly comes from biochemical effluent from a treatment device of the leachate of the municipal household waste or effluent of simply chemical-physical treated biochemical effluent. The steps of the method are as follows: at normal temperature and under the condition of 0.5 BV / h to10BV / h of flow, pretreated tail water is absorbed by a device filled with adsorbent resins with complex functions or macroporous resin to yield water, so as to be discharged by reaching the mark; the resin is desorbed and regenerated by sodium hydroxide solution, the flow of desorbing agent is 0.5BV / h to 3.0BV / h, desorbing liquid with high concentration is burnt or disposed by other safe disposal methods, and desorbing liquid with low concentration can be used for preparing the next batch of desorbing agent for circular application. The method of the invention can reduce the COD of the tail water to below 100mg / L from about 150mg / L to 500mg / L and can reduce the ion concentration of ammonia nitrogen, total nitrogen and heavy metal to be below first-grade state emission standard. The method of the invention has the advantages of simple technique and large treatment amount, which can make up the shortcomings of the existing treatment technology of leachate of municipal household waste.

Description

technical field [0001] The invention relates to a treatment method for biochemically treating tail water of municipal solid waste leachate, specifically, it refers to the treatment method for COD after biochemical treatment of municipal solid waste leachate. Cr , ammonia nitrogen or total nitrogen exceeding the low concentration tail water (COD Cr =150~500mg / L), the method of treatment to make it reach the discharge standard. Background technique [0002] Garbage leachate is the sewage filtered out due to precipitation, self-fermentation or groundwater immersion during the process of stacking and landfilling garbage in sanitary landfills. Landfill leachate is a high-concentration organic wastewater with complex components. Its components are mostly organic pollutants, high in ammonia nitrogen, heavy metals and various carcinogenic, teratogenic and mutagenic organic substances, which are extremely harmful to the environment and human body. At the same time, the pollutant co...

AI Technical Summary

Problems solved by technology

Membrane filtration generally uses nanofiltration or reverse osmosis membranes, which have a good treatment effect on tail water, but the concentrated solution intercepted by the membrane has become a major drawback that limits the promotion of this technology; activated carbon adsorption has a good effect on the treatment of organic matter in tail water, but Regeneration is difficult and treatment costs are high, so it has not been widely used; while chemical oxidation has a good decolorization effect on tail water and a good effect on the degradation of organic matter, but it consumes a lot of energy and has high operating costs, so it is difficult to promote use

[0004] At present, the typical landfill leachate treatment process in China focuses on the integrated biochemical + membrane treatment process, but on the one hand, the biochemical tail water cannot be well treated through the nanofiltration membrane, and the effluent quality of the tail water after nanofiltration (especially the total Nitrogen) is still difficult to reach the standard. On the other hand, the investment and operating costs of nanofiltration are relatively high