Zero emission treatment device and method for late-stage landfill leachate

Abstract

The invention relates to the technical field of environmental engineering and aims to provide a zero emission treatment device and method for late-stage landfill leachate. The device and method can improve overall reaction efficiency of partial nitrification-anaerobic ammonia oxidation, realize zero emission treatment of the landfill leachate and remove phosphorus, organic matters and heavy metalions in the landfill leachate. According to the technical scheme, the zero emission treatment device for late-stage landfill leachate is characterized by comprising a regulating tank unit, a partial nitrification-anaerobic ammonia oxidation integrated reactor unit, a carbonization tank unit, a denitrification tank unit, a spirulina-nitrification tank unit, a sedimentation tank, a membrane filtration system unit and an intelligent control system, wherein the partial nitrification-anaerobic ammonia oxidation integrated reactor unit comprises a partial nitrification tank unit and an anaerobic ammonia oxidation reactor unit; the spirulina-nitrification tank unit comprises a spirulina tank unit and a nitrification tank unit; the membrane filtration system unit comprises a microfilter, a nanofilter and an ultrafilter.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a device and method for zero-discharge treatment of late-stage landfill leachate. Background technique [0002] Landfill leachate refers to a kind of high-concentration organic wastewater produced by self-degradation, internal containment, surface runoff, groundwater infiltration and other forms during the process of landfill and stacking. The concentration of organic matter in landfill leachate is high and difficult to degrade, the content of ammonia nitrogen and heavy metals is high, and the water quality and quantity vary greatly, and it is colored and smelly. The filtrate produced by landfilling garbage for more than 10 years is classified as late garbage filtrate, which is characterized by high ammonia nitrogen content and low C / N (carbon-to-nitrogen ratio). Domestic sanitary landfills began in the 1990s, and most of the domestic landfills are in the late ...

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: (1) aeration is required in the nitrification stage, which consumes a lot of energy; (2) the C / N in landfill leachate is low, and the denitrification efficiency is only 10%, and a large amount of carbon source is required to ensure the anaerobic stage Efficient operation of denitrification; (3) A large amount of activated sludge is generated in the A / O stage, which is easy to block the filter membrane and reduce the service life of the filter membrane

[0005] Although the short-cut nitrification-anammox process has the above advantages, there are still some problems in the field of landfill leachate treatment: (1) the growth and metabolism of anammox bacteria are slow, and the doubling time is long, so the process start-up time is long; (2) Anaerobic ammonia oxidation stage, anaerobic ammonium oxidation reaction produces N 2 , it is easy to cause the anammox sludge particles to float up, which leads to the loss of the bacteria carried by the sludge particles; (3) in the short-range nitrification stage, the optimum temperature of the nitrifying bacteria is 25°C. Under aerobic conditions, the metabolism of the nitrifying bacteria Decompose organic matter and release energy, so an external cooling tower is required to cool down; (4) in the anammox stage, the optimum temperature for anammox bacteria is 37°C, and an external heater is usually required to maintain the reaction temperature; ambient temperature Changes can easily weaken the activity of bacteria and prolong the reaction time; (5) Anammox reaction conditions are strict, requiring ammonia nitrogen and nitrite nitrogen as direct substrates (NH 4 + -N:NO 2 - -N=1:1.32), so short-cut nitrification is required to provide stable NO 2 - (6) strains are easily inhibited by various pollutants, affecting the retention and amplification of anammox bacteria, while reducing their activity; (7) in practical applications, the anammox stage cannot be 100 % ammonia nitrogen removal, and pollutants with large content of phosphorus, organic matter, heavy metal ions and other pollutants in the landfill leachate need to be removed by subsequent processes

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