A kind of treatment method of nitric acid type high chlorine ammonia nitrogen containing wastewater

A technology for ammonia nitrogen wastewater and treatment methods, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as relatively little attention, and reduce disposal costs and treat the environment Mild and pure effect

Active Publication Date: 2021-06-01
盛隆资源再生(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as patent publication number CN102642974A effectively removes heavy metal ions in high-acid high-chlorine wastewater; patent publication number CN101723486A adopts electrochemical catalytic oxidation technology to degrade and remove COD in high-salt and high-chlorine wastewater, and directly removes chloride ions Starting from their own, relatively little attention has been paid to the treatment of chlorine-containing wastewater with relatively complex components.

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  • A kind of treatment method of nitric acid type high chlorine ammonia nitrogen containing wastewater

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Effect test

Embodiment 1

[0029] Take 1 ton of chlorine-containing wastewater, use 30wt% liquid caustic soda to adjust pH=9, add magnesium oxide and sodium aluminate at the same time according to the mass concentration ratio of chlorine in wastewater as 2:2:1, and stir and react for 2 hours at 40°C Filtration and separation to obtain aluminum magnesium hydrotalcite solid and filtrate, the determination of chlorine content in the filtrate is 4.32ppm;

[0030] Add magnesium oxide and disodium hydrogen phosphate in sequence to the above filtrate according to the mass concentration ratio of ammonia nitrogen in the wastewater 1.2:1.1:1, stir for 1 hour and then filter and separate. The ammonia nitrogen content in the filtrate is reduced to 6.83ppm. Dry for 6 hours to obtain white magnesium ammonium phosphate crystals, which can be used as medicine and fertilizer;

[0031] Pass the filtrate into the nanofiltration membrane system to obtain two kinds of dope, respectively use mass concentration of 30% liquid ...

Embodiment 2

[0034] Take 1.5 tons of chlorine-containing wastewater, use a liquid caustic soda with a mass concentration of 35wt% to adjust the pH=9.5, and add magnesium oxide and sodium aluminate at the same time according to the mass concentration ratio of chlorine in the wastewater to 2.5:2:1, and stir and react at 45°C for 2.5h After filtering and separating to obtain the aluminum-magnesium hydrotalcite solid and the filtrate, the chlorine content in the filtrate was determined to be 3.68ppm;

[0035] Magnesium oxide and disodium hydrogen phosphate were sequentially added to the above filtrate according to the mass concentration ratio of ammonia nitrogen in the waste water at 1.25:1.1:1, stirred for 1.5 hours, filtered and separated, the ammonia nitrogen content in the filtrate was reduced to 2.69ppm, and the solid precipitate was heated at 56°C Drying at low temperature for 7 hours to obtain white magnesium ammonium phosphate crystals, which can be used as medicine and fertilizer;

[...

Embodiment 3

[0039] Take 2 tons of chlorine-containing wastewater, use 40wt% liquid caustic soda to adjust the pH=10, add magnesium oxide and sodium aluminate at the same time according to the mass concentration ratio of chlorine in the wastewater to 3:2:1, and stir and react for 3 hours at 50°C Filtration and separation to obtain aluminum magnesium hydrotalcite solid and filtrate, the determination of chlorine content in the filtrate is 1.98ppm;

[0040] Magnesium oxide and disodium hydrogen phosphate were sequentially added to the above filtrate according to the mass concentration ratio of ammonia nitrogen in the wastewater 1.5:1.1:1, stirred for 2 hours, filtered and separated, the ammonia nitrogen content in the filtrate was reduced to 4.36ppm, and the solid precipitate was placed at 60°C Dry for 8 hours to obtain white magnesium ammonium phosphate crystals, which can be used as medicine and fertilizer;

[0041] Pass the filtrate into the nanofiltration membrane system to obtain two ki...

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Abstract

The invention discloses a method for treating nitric acid-type high-chlorine ammonia-nitrogen-containing waste water. The method comprises the following steps: (1) using liquid caustic soda to adjust the pH of the waste water to 9-10, then adding magnesium oxide and sodium aluminate, and mixing and reacting After solid-liquid separation; (2) adding magnesium oxide and disodium hydrogen phosphate to the filtrate obtained by separating the step (1), filtering after stirring and reacting to obtain crystals of magnesium ammonium phosphate; (3) passing the filtrate obtained in step (2) through nanofiltration The membrane system has to separate two kinds of concentrated liquids to prepare sodium dihydrogen phosphate and sodium nitrate; (4) calcining the magnesium aluminum hydrotalcite solid separated in step (1) to prepare sodium chloride; (5) preparing sodium chloride from the step ( 4) The solid residue after calcination is dissolved in liquid caustic soda, reacted and mixed, and then filtered to obtain a solution of magnesium oxide solid and sodium metaaluminate. The invention effectively separates the chlorine and ammonia nitrogen in the waste water, so as to realize the resource treatment of such waste water, and no secondary waste and secondary pollution occur in the process.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method for nitric acid-type high-chlorine ammonia nitrogen-containing wastewater. Background technique [0002] In recent years, my country's industrialization has accelerated rapidly, and the accompanying water pollution has become increasingly serious. Industries such as electroplating, papermaking, printing and dyeing involve a wide range of chlorine-containing compounds, which will produce a large amount of chlorine-containing wastewater during use. If discharged without treatment, it will cause damage to the water environment, and even endanger groundwater and drinking water sources. thereby affecting human health. [0003] At present, the treatment methods for this kind of wastewater mainly include heating concentration method, ion exchange method, electrochemical method, redox method, etc. These methods have certain shortcomings, among ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01F7/00C01B25/45C02F101/10C02F101/12C02F101/16
Inventor 方稳陈琪郎超刘秋月叶龙
Owner 盛隆资源再生(无锡)有限公司
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