A landfill leachate advanced treatment system

Abstract

The invention provides a landfill leachate deep treatment system, and relates to the field of sewage treatment equipment. The landfill leachate deep treatment system comprises a first coagulative precipitation tank, an electro-fenton pool, a photoreactor, a second coagulative precipitation tank, a biological aerated filter, a flocculating agent dosing tank, an acid dosing tank, an alkali dosing tank and a ferrous sulfate dosing tank. After the system is adopted, the leachate secondary effluent is first subjected to flocculation and sedimentation, so that part of organic matters and divalent ions can be removed, and the subsequent treatment cost is further lowered. The leachate precipitation effluent is treated by means of electro-fenton and the photoreactor, so that most of the organic matters can be completely mineralized or decomposed into small molecular easily-biodegradable organic matters; due to the synergistic effect of the electro-fenton and the photoreactor, the consumption of ferrous sulfate and the yield of iron mud are greatly reduced in a fenton reaction; hydrogen peroxide is generated in a reaction process, thus not needing to be added; furthermore, after the landfill leachate deep treatment system is adopted, the degradation effect is further improved, so that the cost is greatly lowered, and the secondary pollution is reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment equipment, in particular to an advanced treatment system for landfill leachate. Background technique [0002] There are many kinds of organic pollutants in municipal solid waste leachate, the water quality is complex, the content of ammonia nitrogen and heavy metals is high, the water quality and quantity vary greatly, and the treatment is difficult. At present, we can treat it to the third-level standard of "Integrated Sewage Discharge Standard" (GB8978-1996), but how to reach the first-level standard or "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB 16889-2008) or even zero Emissions are still a problem. Membrane treatment is an advanced treatment method widely used at present, which can make the effluent stable up to the first-class standard, but the concentrated solution produced by it is a headache. In view of the further stringent national environmental protection re...

AI Technical Summary

Problems solved by technology

[0002] There are many kinds of organic pollutants in municipal solid waste leachate, the water quality is complex, the content of ammonia nitrogen and heavy metals is high, the water quality and quantity vary greatly, and the treatment is difficult

At present, we can treat it to the third-level standard of "Integrated Wastewater Discharge Standard" (GB8978-1996), but how to reach the first-level standard or "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB 16889-2008) or even zero Emissions are still a problem

Membrane treatment is an advanced treatment method widely used at present, which can make the effluent stable up to the first-class standard, but the concentrated solution produced by it is a headache

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