Rapid biological denitrification method for biochemical effluent of landfill leachate

Abstract

The invention discloses a rapid biological denitrification method for biochemical effluent of landfill leachate, belonging to the field of water treatment. The rapid biological denitrification methodcomprises the following steps: 1) selecting Bacillus pumilus AD 0599 as a denitrifying strain; 2) subjecting the denitrifying strain to multiplication culture obtain bacteria, and mixing the obtainedbacteria with anaerobic sludge at the biochemical front end of the landfill leachate to obtain a seed strain; 3) placing the seed strain at the bottom of a denitrification filter, loading granular activated carbon, and introducing activated wastewater into the denitrification filter for activation; and 4) stopping the introduction of the activated wastewater, adding a carbon source, and then introducing the landfill leachate for denitrification. The method of the invention can directly perform rapid biological denitrification on the low-carbon-nitrogen-ratio biochemical effluent of the landfill leachate. The Bacillus pumilus is selected and used, and nitrate nitrogen in the biochemical effluent can be quickly denitrified and removed by adding only a small amount of the carbon source; at the same time, the CODcr of the effluent can be further reduced, so pressure on subsequent membrane separation can be alleviated.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for rapid biological denitrification of landfill leachate biochemical effluent. Background technique [0002] Landfill leachate is a kind of high-concentration wastewater produced during the sanitary landfill process of garbage. It contains water squeezed out of the garbage itself, rain and snow entering the landfill, and metabolic water produced by microorganisms decomposing organic matter. It changes with the type of garbage, region, season, and landfill time. Generally speaking, the landfill leachate industry has relatively high CODcr and total nitrogen, of which CODcr ranges from 10,000 to 100,000, and total nitrogen generally exceeds 1,000 mg / L. At present, domestic and foreign leachate treatment is mainly based on biochemical + membrane separation treatment technology, and the actual engineering cases of traditional biochemical + nanofiltration membrane separation t...

AI Technical Summary

Problems solved by technology

If the primary chemical section is directly adjusted, the project will be greatly changed, uncertain factors will increase and the effect will be slow, the energy consumption will be large, and the effect on reducing the nitrate nitrogen in the terminal effluent will not be significant, which is not cost-effective

If at the end of the biochemical section, it is removed by physical and chemical methods such as reverse osmosis process or dosing, not only the cost is high, but there may also be secondary pollutants

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