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Method for improving efficiency of processing ammonia nitrogen in landfill leachate by magnesium ammonium phosphate precipitation process

A technology for the precipitation of landfill leachate and struvite, which is applied in the field of environmental engineering, can solve the problem that the treatment efficiency has not been maximized, achieve good industrial application prospects, improve the removal effect, and reduce the effect of residues

Inactive Publication Date: 2019-06-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment efficiency of the struvite precipitation method that has been studied so far has not been maximized, and there is a lot of room for improvement

Method used

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  • Method for improving efficiency of processing ammonia nitrogen in landfill leachate by magnesium ammonium phosphate precipitation process
  • Method for improving efficiency of processing ammonia nitrogen in landfill leachate by magnesium ammonium phosphate precipitation process
  • Method for improving efficiency of processing ammonia nitrogen in landfill leachate by magnesium ammonium phosphate precipitation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Get 500ml of landfill leachate (the specific parameters of landfill leachate are shown in Table 1), the volume concentration of 30% hydrogen peroxide dosing is 20ml / L, FeSO 4 ·7H 2 O and H 2 o 2 The molar ratio of dosage is 1:8, and react for 40 minutes under the environment of pH value 2, 3, 4, 5 and 6 respectively. Afterwards adjust the pH to 9.5 with sodium hydroxide, according to NH 3-N / P / Mg=1 / 1 / 1, add magnesium chloride and disodium hydrogen phosphate for reaction, stir with a magnetic stirrer for 10 minutes, and let stand for 30 minutes. After the reaction, the supernatant was taken to pass through a 0.45 μm filter membrane to obtain a treated water sample.

[0041] Table 1 Water quality characteristics of landfill leachate

[0042]

[0043] Analysis of NH in the supernatant 3 -N and TOC removal rate, to explore the effect of pH value on the removal of ammonia nitrogen by MAP precipitation method. The specific results are shown in Table 2.

[0044] Tabl...

Embodiment 2

[0048] Take 500ml landfill leachate, FeSO 4 ·7H 2 O and H 2 o 2 The dosage molar ratio is 1:8, and the volume concentration is 8mL / L, 10ml / L, 12ml / L, 16ml / L, 18ml / L, 20ml / L, 24ml / dosing 30% hydrogen peroxide, and the pH value is 4 reaction 80min. Afterwards adjust the pH to 9.5 with sodium hydroxide, according to NH 3 -N / P / Mg=1 / 1 / 1, add magnesium chloride and disodium hydrogen phosphate for reaction, stir with a magnetic stirrer for 10 minutes, and let stand for 30 minutes. After the reaction, the supernatant was taken to pass through a 0.45 μm filter membrane to obtain a treated water sample. Analysis of NH in the supernatant 3 -N and TOC removal rate, to explore the effect of the amount of hydrogen peroxide on the removal of ammonia nitrogen by MAP precipitation method.

[0049] Table 3 The results of water samples treated with the amount of hydrogen peroxide in Fenton

[0050]

[0051] like figure 2 As shown, with the change of hydrogen peroxide dosage, the rem...

Embodiment 3

[0053] Take 500ml landfill leachate, the dosage of 30% hydrogen peroxide is 20ml / L, according to FeSO 4 ·7H 2 O and H 2 o 2 The molar ratio of the dosage is 1:14, 1:12, 1:10, 1:8, 1:6 to add ferrous salt, and the pH value is 4 to react for 60 minutes. Then adjust the pH to 9.5 with sodium hydroxide, add magnesium chloride and disodium hydrogen phosphate according to the ratio of NH3-N / P / Mg=1 / 1 / 1 to react, stir with a magnetic stirrer for 10 minutes, and let stand for 30 minutes. After the reaction, the supernatant was taken to pass through a 0.45 μm filter membrane to obtain a treated water sample. Analysis of NH in the supernatant 3 -N and TOC removal rate, exploring FeSO 4 ·7H 2 O and H 2 o 2 The effect of the molar ratio of dosage on the removal of ammonia nitrogen by MAP precipitation method. The results are shown in Table 4.

[0054] Table 4 The results of water samples treated with different ratios of ferrous iron and hydrogen peroxide in Fenton

[0055]

...

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Abstract

The invention discloses a method for improving efficiency of processing ammonia nitrogen in landfill leachate by a magnesium ammonium phosphate precipitation process, and belongs to the field of environmental engineering. The method provided by the invention improves the effect of processing the landfill leachate by the magnesium ammonium phosphate precipitation through a combination of the magnesium ammonium phosphate precipitation and Fenton, so that the removal effect is obviously improved; the Fenton pretreatment is utilized before the process of processing the landfill leachate by the magnesium ammonium phosphate precipitation, so that the process of the magnesium ammonium phosphate precipitation is facilitated, the efficiency of processing the ammonia nitrogen by magnesium ammonium phosphate is effectively improved, and residual ammonia nitrogen in water is reduced; a usage amount of hydrogen peroxide and a ratio of the hydrogen peroxide to ferrous iron in the Fenton reaction arecontrolled, and the pH environment of the reaction is controlled, so that the removal efficiency of the ammonia nitrogen is improved, the sedimentation time of sediments is shortened, the costs of removing the ammonia nitrogen by the magnesium ammonium phosphate precipitation process are reduced, and the method has very good industrial application prospects.

Description

technical field [0001] The invention specifically relates to a method for improving the efficiency of treating ammonia nitrogen in landfill leachate by a struvite precipitation method, which belongs to the field of environmental engineering. Background technique [0002] In recent years, with the acceleration of my country's urbanization process and the gradual improvement of people's living standards, the output of municipal solid waste has continued to increase. The main treatment methods of domestic waste include recycling, composting, incineration and landfill, etc. Due to the high economic efficiency of sanitary landfill, this method is often used to treat domestic waste in developing countries and underdeveloped regions. However, due to the degradation of the waste dump during the landfill process, factors such as atmospheric precipitation, groundwater influx, and surface runoff will inevitably produce a large amount of landfill leachate. Landfill leachate contains a ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/14C02F101/16C02F103/06C02F101/30
Inventor 阮文权杜雯倩施万胜李靖蒋昌旺
Owner JIANGNAN UNIV