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Method for removing ammonia and nitrogen in garbage percolate

A technology for landfill leachate and ammonia nitrogen, which is applied in separation methods, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as the application of ammonia gas that has not been reported in literature, and achieves reduction of secondary pollution and improvement of conditions. , the effect of saving processing costs

Inactive Publication Date: 2008-05-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no literature reports and patent publications on the research and application of the bio-trickling filter bed technology to treat the ammonia gas produced by the pyrolysis of magnesium ammonium phosphate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The ammonia nitrogen concentration of the landfill leachate in the reaction tank is 1400mg / l, and magnesium sulfate and sodium dihydrogen phosphate are added in the waste water, and the molar ratio of each component in the reaction system is magnesium salt: phosphate: ammonia nitrogen=(1.1~1.3): (0.7~0.9): 1.0, then add sodium hydroxide to make the pH value of the reaction system 9.5~10.0, mix and stir for 30min, then settle by natural gravity for 100min, separate the supernatant and the precipitate, and separate the separated precipitate Carry out dehydration, then add blast furnace slag in the precipitation magnesium ammonium phosphate, control the weight ratio of two kinds of components in ammonium magnesium phosphate and blast furnace slag mixture system to be ammonium magnesium phosphate: blast furnace slag=10: (2.0~3.0), add a small amount The water (as long as the amount of water can be mixed and stirred) is mixed and stirred for 30 minutes, and then the magnesium...

Embodiment 2

[0032] The ammonia nitrogen concentration of the landfill leachate in the reaction tank is 2900mg / l, and magnesium chloride and potassium phosphate are added in the waste water, and the mol ratio of each component in the reaction system is magnesium salt: phosphate: ammonia nitrogen=(0.9~1.1): (1.1~ 1.2): 1.0, then add sodium hydroxide so that the pH of the reaction system is 8.5 to 9.0, mix and stir for 35 minutes, then settle by gravity for 50 minutes, separate the supernatant from the precipitate, and dehydrate the separated precipitate. Add blast furnace slag then in the throw out magnesium ammonium phosphate, control the weight ratio of two kinds of compositions in magnesium ammonium phosphate and blast furnace slag mixture system be magnesium ammonium phosphate: blast furnace slag=10: (2.5~3.0), add a small amount of water ( As long as the amount of water can be mixed and stirred) Mix and stir for 35 minutes, then heat and decompose magnesium ammonium phosphate, the heati...

Embodiment 3

[0034] The ammonia nitrogen concentration of the landfill leachate entering the reaction tank is 3300mg / l, magnesium chloride and dipotassium hydrogen phosphate are added in the reaction tank, and the molar ratio of each component in the reaction system is magnesium salt: phosphate: ammonia nitrogen=(0.9~1.2 ): (0.8~1.0): 1.0, then add sodium hydroxide, adjust the pH value of reaction system to be 9.0~9.5, the time of mixing and stirring reaction is 50min, then the time of natural gravity precipitation is 120min, supernatant and The precipitate is separated, and the precipitate after separation is dehydrated again, and then the blast furnace slag is added to the precipitate magnesium ammonium phosphate, and the weight ratio of the two components in the magnesium ammonium phosphate and blast furnace slag mixture system is controlled to be magnesium ammonium phosphate: blast furnace slag=10 : (1.0~1.5), add a small amount of water (as long as the amount of water reaches the purpo...

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PUM

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Abstract

The invention discloses a method of removing ammonia nitrogen in landfill leachate, pertaining to the wastewater treatment field. The method mainly comprises the steps that magnesium salts and phosphates are first added into the landfill leachate, regulating the pH value and the mole ratio of the magnesium salts and the phosphates and the ammonia nitrogen, which are mixed and stirred so as to produce deposit of magnesium ammonium phosphate; supernatant and the deposit are next separated and precipitation and dehydration are then carried out; blast furnace slag is then added into the dehydrated magnesium ammonium phosphate, the weight ratio of the magnesium ammonium phosphate and the blast furnace slag is controlled, mixed by adding water, and then the magnesium ammonium phosphate is treated with pyrolysis with pyrolysis time and temperature being controlled; ammonia gas generated by the pyrolysis is treated by bio-trickling filter bed and a solid product by the pyrolysis is recovered and recycled in the treatment of the ammonia nitrogen. The invention can not only remove the ammonia nitrogen by recycling chemical precipitation agent with charges saved, but also realize reclamation utilization of the blast furnace slag. The concentration of effluent of the ammonia nitrogen can decrease below 100mg / l after being treated by the invention, which greatly improves conditions for consequent biochemical treatment.

Description

technical field [0001] The invention relates to a method for treating landfill leachate, in particular to a method for removing ammonia nitrogen in landfill leachate. Background technique [0002] The composition of landfill leachate is quite complex. It not only contains high concentrations of organic matter, but also contains high concentrations of ammonia nitrogen, alkali and heavy metals. It is a kind of difficult-to-treat wastewater. In the initial stage of landfill, the biodegradability of landfill leachate is good, and the B / C reaches about 0.7. However, with the extension of landfill time, the mass concentration of ammonia nitrogen increased, and the mass ratio of C to N was less than 3. At the same time, the biodegradability of landfill leachate decreased, and B / C was lower. At present, the most economical and effective way to remove high-concentration COD in landfill leachate is anaerobic biological treatment. However, because high concentrations of ammonia nitro...

Claims

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Application Information

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IPC IPC(8): C02F9/10B01D53/58B01D53/84
CPCY02A50/20
Inventor 任洪强张涛丁丽丽谭婧
Owner NANJING UNIV
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