Treatment method for nitric acid type high-chlorine ammonia-nitrogen-containing wastewater

A technology of ammonia nitrogen wastewater and treatment method, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , handle the effect of mild environment

Active Publication Date: 2019-05-28
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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  • Treatment method for nitric acid type high-chlorine ammonia-nitrogen-containing wastewater

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Experimental program
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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 a mass concentration of 40wt% liquid caustic soda to adjust 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 waste water at 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 heated 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...

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Abstract

The invention discloses a treatment method for nitric acid type high-chlorine ammonia-nitrogen-containing wastewater. The method comprises the following steps: (1) regulating the pH (Potential of Hydrogen) of the wastewater to be 9 to 10 with liquid caustic soda; then adding magnesium oxide and sodium aluminate; after uniformly mixing and reacting, carrying out solid-liquid separation; (2) addingthe magnesium oxide and disodium hydrogen phosphate into filtrate separated in step (1); after stirring and reacting, filtering to obtain magnesium ammonium phosphate crystals; (3) separating filtrateobtained by step (2) through a nanofiltration membrane system to obtain two kinds of concentrated liquid, so as to prepare sodium dihydrogen phosphate and sodium nitrate; (4) calcining magnesium-aluminum hydrotalcite solids separated by step (1) to prepare sodium chloride; (5) dissolving solid residues obtained by calcining in step (4) into the liquid caustic soda; after reacting and uniformly mixing, filtering to obtain magnesium oxide solids and a sodium metaaluminate solution. The treatment method disclosed by the invention is used for effectively separating chlorine and ammonia-nitrogen in the wastewater, so that the resourceful treatment of the wastewater is realized and no waste or secondary pollution is caused 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 Applications(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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