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Method for eliminating ammonia nitrogen in waste water by using magnesium hydroxide

A magnesium hydroxide and waste water technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as corrosion of equipment and structures, high cost of water treatment, and increased concentration of soluble salts, etc., to improve Reactivity, reduced treatment costs, and efficient removal effects

Inactive Publication Date: 2011-04-06
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of using soluble magnesium salts to treat high-concentration ammonia nitrogen wastewater is better than that of slightly soluble magnesium salts. However, soluble magnesium salts (magnesium chloride and magnesium sulfate) are more expensive, resulting in high water treatment costs, and Cl in soluble magnesium salts - and SO 4 2- It has a strong corrosion effect on equipment and structures, and the concentration of soluble salts in wastewater increases after treatment, which increases the difficulty of subsequent treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Get 2L of waste water with an ammonia nitrogen concentration of 10.0g / L, inject it into the reaction vessel, start stirring, and add 614g of disodium hydrogen phosphate (Na 2 HPO 4 .12H 2 0), adding 257g mass fraction is 40% pasty magnesium hydroxide, the pH value of solution is 9 with sodium hydroxide regulator, after reacting for 3 hours, suction filtration reaction completes liquid, and ammonia nitrogen content is 0.9g / L in the filtrate, The removal rate of ammonia nitrogen is 91%.

Embodiment 2

[0018] Take 2L of wastewater with an ammonia nitrogen concentration of 5.0g / L, inject it into the reaction vessel, start stirring, and add 214g of sodium dihydrogen phosphate (NaH 2 PO 4 .2H 2 (0), add 245g mass fraction and be 28% slurry-like magnesium hydroxide, adjust the pH value 8 of solution with sodium hydroxide, react after 2 hours, suction filtration reaction completes liquid, and ammonia nitrogen content is 0.3g / L in the filtrate, The removal rate of ammonia nitrogen is 94%.

Embodiment 3

[0020] Get 2L of waste water with an ammonia nitrogen concentration of 5.0g / L, inject it into the reaction vessel, start stirring, and add 409g of disodium hydrogen phosphate (Na 2 HPO 4 .12H 2 (0), adding 196g mass fraction is 35% slurry-like magnesium hydroxide, adjust the pH value of the solution to 9 with sodium hydroxide, after reacting for 3 hours, suction filter the reaction to complete the liquid, and the ammonia nitrogen content is 0.4g / L in the filtrate, The removal rate of ammonia nitrogen is 92%.

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Abstract

The invention discloses a method for eliminating ammonia nitrogen in waste water by using magnesium hydroxide. Pasty magnesium hydroxide or pulpy magnesium hydroxide is used as a magnesium based precipitant, phosphate is used as a phosphorus based precipitant, the molar ratio of magnesium in the magnesium based precipitant to ammonia nitrogen in the waste water is (1.2 to 1.6):1, the molar ratio of phosphate in the phosphate based precipitant to the ammonia nitrogen in the waste water is (1.0 to 1.2):1, and the ammonia nitrogen is removed from the waste water in a precipitate mode after reacting with the magnesium and the phosphate. By means of the invention, the defects of high processing cost and high causticity of processed water in the prior art due to using soluble magnesium salt are solved, and the ammonia nitrogen in the waste water is efficiently removed and the processing cost of the waste water is further lowered.

Description

technical field [0001] The invention relates to a method for removing ammonia nitrogen in waste water, belonging to the technical field of chemical engineering and environmental protection. Background technique [0002] Pollution control, energy saving and emission reduction have become important issues in the implementation of sustainable development strategies in my country. Ammonia nitrogen wastewater, as an important pollutant of water eutrophication, has become the focus of governance. After ammonia nitrogen wastewater is discharged into lakes, reservoirs, estuaries, bays and other water bodies, it will cause eutrophication of the water body. Aquatic organisms, especially algae, will multiply in large numbers, destroying the ecological balance of the water body, leading to deterioration of water quality and fish death. Dianchi Lake in Yunnan, Taihu Lake in Wuxi, East Lake in Wuhan, West Lake in Hangzhou, Xuanwu Lake in Nanjing, Daming Lake in Jinan, and Dahuofang Reserv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F101/16
Inventor 王玉琪张雨山王俐聪刘骆峰黄西平
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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