Efficient denitrification method and efficient denitrification system for landfill leachate

Abstract

The invention discloses an efficient denitrification method and an efficient denitrification system for landfill leachate. The system comprises an adjusting tank, an electric flocculation system, a short-cut nitrification-anaerobic ammonia oxidation system and a photocatalysis-persulfate oxidation system which are connected in sequence, wherein the short-cut nitrification-anaerobic ammonia oxidation system is filled with a tourmaline and glass pumice composite filler, and the photocatalysis-persulfate oxidation system is provided with a persulfate adding device and bentonite loaded nano titanium dioxide. According to the invention, landfill leachate is treated by utilizing an electric flocculation coupling short-cut nitrification-anaerobic ammonia oxidation technology and a photocatalysis-persulfate technology, so that ammonia nitrogen, organic matters and heavy metals in landfill leachate are efficiently removed.

Description

Technical field [0001] The invention relates to the field of landfill leachate treatment, in particular to a method and system for efficiently removing nitrogen from landfill leachate. Background technique [0002] The conventional treatment technology of landfill leachate is mainly divided into physical and chemical methods and biological methods. Among them, physical and chemical methods include coagulation, stripping, chemical precipitation, etc., and biological laws include anaerobic biological treatment, aerobic biological treatment and anaerobic- Aerobic combined treatment, in recent years, including ozone, electrochemistry, persulfate oxidation technology and other advanced oxidation technology in the landfill leachate treatment more and more applications. [0003] The prior art adopts the combined process of short-cut nitrification and anaerobic ammonia oxidation and electro-oxidation to treat landfill leachate. After pretreatment in the UASB tank and short-cut nitrificatio...

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Problems solved by technology

In the above-mentioned technical scheme, there are mainly the following disadvantages: (1) In this technical scheme, heavy metals are not effectively removed in the front stage of biochemical treatment, the landfill leachate has complex components, and the content of inorganic salts and heavy metals is high. The toxic effects of microorganisms lead to a decrease in the efficiency of subsequent biochemical treatment; (2) By using the A / O pool and the anammox pool for short-range nitrification and anammox, respectively, the cost of construction, operation and maintenance is relatively high, Large area; (3) Electro-oxidation technology is used, the efficiency of single electro-oxidation technology to degrade pollutants is low, and the treatment time is long

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