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Technique for processing ammonia-nitrogen wastewater employing struvite formation

A technology for struvite precipitation and ammonia nitrogen wastewater is applied in the field of struvite precipitation treatment of ammonia nitrogen wastewater, which can solve the problems of long sludge acclimation time, high energy consumption by stripping method, unsatisfactory treatment effect of high concentration ammonia nitrogen wastewater, etc. Realize the effect of resource reuse, design and simple operation

Inactive Publication Date: 2014-06-11
洛阳智方环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blow-off method has high energy consumption, high operating cost, easy fouling, and low blow-off efficiency in cold seasons
The biological method occupies a large area, the reaction speed is slow, the sludge domestication time is long, and the treatment effect on high-concentration ammonia nitrogen wastewater is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 500mL of wastewater, add different sources of magnesium and phosphorus according to the molar ratio of Mg:N:P of 1:1:1, adjust the pH of the solution to 8.5 with 3mol / L sodium hydroxide solution, and stir for 15 minutes , let stand for 10min, take the filtrate after solid-liquid separation and measure, the results are shown in Table 1.

[0033] Table 1.

[0034] serial number

[0035] As can be seen from the above table 1, the highest ammonia nitrogen removal rate and the lowest remaining phosphorus is the reaction using magnesium chloride and sodium hydrogen phosphate, so the best choice of magnesium source of the present invention is magnesium chloride, and the best choice of phosphorus source is phosphoric acid sodium hydrogen.

Embodiment 2

[0037] Take 500mL of waste water, add magnesium chloride and sodium hydrogen phosphate as magnesium source and phosphorus source according to a certain proportion, adjust the pH of the solution to 8.5 with 3mol / L sodium hydroxide solution, stir for 15 minutes, let it stand for 10 minutes, and take it after solid-liquid separation. The filtrate was tested and the results are shown in Table 2.

[0038] Table 2.

[0039] serial number

[0040] It can be seen from the above table 2 that the ratio of Mg:N:P molar ratio when the removal rate of ammonia nitrogen is the highest and the residual amount of phosphorus is low is 1.2:1:0.8.

Embodiment 3

[0042] Take 500mL of wastewater, add magnesium chloride and sodium hydrogen phosphate as magnesium source and phosphorus source respectively according to the molar ratio of Mg:N:P of 1.2:1:0.8, and adjust the solution to different levels with 3mol / L sodium hydroxide solution. pH, stirred to react for 15min, and left to stand for 10min, after solid-liquid separation, the filtrate was taken for measurement, and the results are shown in Table 3.

[0043] table 3.

[0044] serial number

[0045]As can be seen from the above table 3, the pH values ​​of the solutions with higher ammonia nitrogen removal rate and less phosphorus residue are respectively 8.1 and 9.2, so the present invention is most suitable to control the pH value between 8-9.

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Abstract

The invention relates to a technique for processing an ammonia-nitrogen wastewater employing struvite formation. The technique comprises the following steps: adding certain magnesium source and phosphorus source to the wastewater, controlling a certain pH value; participating the sediments at the bottom of a reactor after reaction; separating out struvite by solid-liquid separation; entering the wastewater to an anaerobic tank to further process, and marketing the discharged struvite as a controlled release fertilizer, wherein the magnesium source and the phosphorus source respectively are magnesium chloride and sodium hydrogen phosphate; the optimal molar ratio of Mg to N to P is 1.2:1:0.8; the initial ammonia-nitrogen concentration is 210-1260mg / L; the pH of the wastewater is controlled to be 8-9; the solution for adjusting the pH to 2-6mol / L is a sodium hydroxide solution. The technical scheme provided by the invention cannot be limited by the temperature and toxin in water, the design and operation are simple, high-concentration ammonia-nitrogen wastewater can be effectively processed, and the generated struvite sediment is a good controlled release fertilizer. Thus, resource recycling of ammonia-nitrogen is achieved.

Description

technical field [0001] The invention relates to a process method for treating wastewater in the chemical industry, in particular to a process method for treating ammonia nitrogen wastewater by struvite precipitation. Background technique [0002] The rapid development of industrialization produces more and more wastewater, which will pose a major threat to the earth's environment and human health if it is not treated in time. Organic amine products are the most widely used important chemical raw materials. Most of the substances in its production wastewater contain amino groups. These components will release a large amount of ammonia nitrogen during the biodegradation process and need to be further removed. There are many treatment methods for high-concentration ammonia-nitrogen wastewater, such as blow-off method, biological method, ion exchange method, precipitation method, etc. The blow-off method has high energy consumption, high operating cost, easy scaling, and low bl...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52
Inventor 张占晓刘亚莉杨凯刘万平刘大勇邓丽君
Owner 洛阳智方环保技术有限公司
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