A method for rapid biological denitrification of landfill leachate biochemical effluent

Abstract

The invention relates to the field of water treatment, and discloses a rapid biological denitrification method for landfill leachate biochemical effluent, comprising: 1) selecting Bacillus pumilus Bacillus pumilus AD 0599 is used as a denitrifying strain; 2) The denitrifying strain is amplified and cultivated, and the bacteria are obtained and mixed with the anaerobic sludge at the biochemical front end of landfill leachate as the seed strain; 3) The seed strain is placed in the denitrification filter The bottom is loaded with granular activated carbon; the activated wastewater is passed through the denitrification filter for activation; 4) the activated wastewater is stopped, and the landfill leachate is added to denitrify after adding carbon sources. The present invention can directly perform rapid biological denitrification on the biochemical effluent of landfill leachate with low carbon-to-nitrogen ratio. This invention uses Bacillus pumilus to quickly denitrify the nitrate nitrogen in the effluent of the biochemical section by adding only a small amount of carbon source, and At the same time, it can further reduce the CODcr of the effluent, and reduce the pressure of the subsequent membrane separation.

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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