Treatment method for aged landfill leachate

Abstract

The invention provides a treatment method for aged landfill leachate. The method specifically comprises the following steps: collecting the aged landfill leachate in an adjusting tank for adjustment, and causing the adjusted aged landfill leachate to enter a hydrolytic acidification tank for hydrolytic acidification; causing the hydrolytically-acidified leachate to flow from the hydrolytic acidification tank to a primary A / O<2> reaction tank for denitrification / carbon oxidation / nitrification reaction; causing the effluent of the primary A / O<2> reaction tank to flow into a secondary A / O reaction tank, and performing denitrification / nitrification reaction for further denitrification and decarburization; causing the effluent of the secondary A / O reaction tank to enter an ultrafiltration system for ultrafiltration; sequentially delivering permeate produced by the ultrafiltration into a nanofiltration system and a reverse osmosis system for advanced treatment; treating a concentrated solution produced by the nanofiltration system and the reverse osmosis system by adopting a concentrated solution system. According to the method, the concentration of pollutants in discharged water can be effectively reduced to ensure that the discharged water reaches standards.

Description

【Technical field】 [0001] The invention relates to wastewater treatment technology in the field of environmental protection, in particular to a treatment method for aging landfill leachate. 【Background technique】 [0002] With the acceleration of the pace of urbanization in our country, its urban waste has also increased sharply. Landfill leachate produced in the process of landfill is one of the most difficult to treat high-concentration wastewater in the current water environment, which is very harmful to human body and environment. The composition of the leachate of the landfill is constantly changing with the prolongation of the landfill time. The early leachate is generally buried for 3-5 years, and the VFA (volatile fatty acid) content is relatively high, which can account for about TOC (total organic Carbon) more than 50%, easily biodegradable. The BOD / COD (biodegradability) value is relatively high, generally between 0.4 and 0.8, and the ammonia nitrogen concentrati...

AI Technical Summary

Problems solved by technology

[0006] 2. B / C is relatively low, and the biodegradability is poor

[0008] 3. The water quality and quantity change greatly, and the composition is complex

[0010] There are many processes for landfill leachate treatment, but due to the high concentration and complex composition of leachate, special requirements are put forward for the treatment process

Relying on a single treatment process is difficult to meet strict effluent requirements or will result in reprocessing requirements for residues

Judging from the current means and degree of treatment of landfill leachate in my country, it is fundamentally difficult to solve the problem of excessive pollutants such as total nitrogen and refractory organic matter in the effluent by simply using two-stage A / O+ultrafiltration+nanofiltration / reverse osmosis processes

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