Method of treating nitric-acid-type fluorine-bearing ammonia-nitrogen-containing wastewater

A technology for ammonia nitrogen wastewater and treatment methods, which is applied in metallurgical wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of limited treatment process, high treatment requirements, secondary pollution, etc., and achieve simple process, The treatment conditions are mild and the effect of promoting adsorption

Active Publication Date: 2017-11-21
盛隆资源再生(无锡)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the treatment process, this method is only suitable for the treatment of low-concentration fluorine-containing ammonia nitrogen-containing wastewater in the examples. At the same time, the treatment requirements are relatively high, and the by-products chloramine or chlorinated organic matter will cause secondary pollution.

Method used

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  • Method of treating nitric-acid-type fluorine-bearing ammonia-nitrogen-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] During the smelting process of a certain metal, a large amount of nitric acid-type fluorine-containing ammonia nitrogen-containing wastewater was produced, in which the fluorine content was 5g / L, the ammonia nitrogen content was 2g / L, and the COD and BOD content were 4g / L. The following procedures are now used for processing:

[0029] Get 1 ton of above-mentioned waste water, successively add the lime that quality is 4 times of fluorine content, 3% sodium carbonate (unit is kg / L) in waste water, press filter after stirring 1h and obtain defluoridation filtrate (fluorine content 3.16ppm) and Precipitate; Precipitate is dissolved in the hydrochloric acid solution of 30wt% by solid-to-liquid ratio 1:1.5 (unit is kg / L), pressure filtration separates after reaction 2h and obtains calcium chloride solution (calcium chloride content 42.5wt%) and Calcium fluoride (purity 98.3%). The obtained calcium chloride solution is colorless and transparent, the specific gravity can reach...

Embodiment 2

[0033] During the smelting process of a certain metal, a large amount of nitric acid-type fluorine-containing ammonia-nitrogen-containing wastewater was produced, in which the fluorine content was 5.5g / L, the ammonia nitrogen content was 2.5g / L, and the COD and BOD content were 4.5g / L. The following procedures are now used for processing:

[0034] Get 1.5 tons of above-mentioned waste water, successively add the lime that quality is 4.5 times of fluorine content, 4% sodium carbonate (unit is kg / L) in waste water, press filter after stirring 2h and obtain defluoridation filtrate (fluorine content 4.86ppm) and Precipitate: Dissolve the deposit in the hydrochloric acid solution of 30wt% by solid-liquid ratio 1:1.8 (unit is kg / L), press filter and separate after reacting 3h to obtain industrial grade calcium chloride solution (calcium chloride content 45wt%) With calcium fluoride (purity 99.1%). The obtained calcium chloride solution is colorless and transparent, the specific gra...

Embodiment 3

[0038] During the smelting process of a certain metal, a large amount of nitric acid-type fluorine-containing ammonia-nitrogen-containing wastewater was produced, in which the fluorine content was 6g / L, the ammonia nitrogen content was 3g / L, and the COD and BOD content were 5g / L. The following procedures are now used for processing:

[0039] Get 2 tons of above-mentioned waste water, successively add the lime that quality is 5 times of fluorine content, 5% sodium carbonate (unit is kg / L) in waste water, press filter after stirring 3h and obtain defluoridation filtrate (fluorine content 6.58ppm) and Precipitate: The deposit is dissolved in the hydrochloric acid solution of 30wt% by solid-to-liquid ratio 1:2 (unit is kg / L), press filter separation after reaction 4h obtains technical grade calcium chloride solution (calcium chloride content 48.5wt%) ) and calcium fluoride (purity 99.3%). The obtained calcium chloride solution is colorless and transparent, the specific gravity ca...

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Abstract

A method of treating nitric-acid-type fluorine-bearing ammonia-nitrogen-containing wastewater comprises (1) adding lime and sodium carbonate slowly into wastewater in successive manner, and filtering to obtain precipitate and fluorine-removed filtrate; (2) dissolving the precipitate in hydrochloric acid solution, and filtering to obtain calcium chloride solution and calcium fluoride; (3) adding activated carbon into the filtrate of step (1), stirring, adsorbing, and filtering; (4) subjecting the filtrate of step (3) to aeration stripping, adjusting and maintaining pH to 10-11 via liquid alkali, condensing volatized ammonia into liquid ammonia, reflowing part of the ammonia for stripping and concentrating, adjusting pH of stripped liquid to 5-6 via nitric acid, and concentrating to obtain sodium nitrate; (5) regenerating the activated carbon via hydrogen peroxide under ultraviolet irradiation, reusing the regenerated activated carbon, and discharging filtrate or subjecting it to further biochemical treatment. The method is simple, has mild treatment conditions, is free of secondary waste or secondary wastewater occurred during treatment, and allows the wastewater to be effectively treated at the premise of reasonable recycling.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for nitric acid-type fluorine-containing ammonia nitrogen-containing wastewater. Background technique [0002] With the development of the metal smelting industry, the problem of wastewater containing fluorine and ammonia and nitrogen in the smelting process has become increasingly prominent. A large number of chemical reagents such as hydrofluoric acid, ammonia water, nitric acid, and organic solvents are often used in metal smelting, which not only causes high concentrations of F in the generated wastewater - , NH 4+ Plasma, and due to the introduction of auxiliary reagents such as surfactants, wastewater usually has a special and unpleasant odor, and at the same time has poor biodegradability (BOD / COD<0.1), which exacerbates the difficulty of actual treatment. [0003] For fluorine-containing ammonia nitrogen-containing wastewater, the trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/22C01F11/28C01C1/02C01D9/00C02F103/16C02F101/16C02F101/14
CPCC01C1/022C01D9/00C01F11/22C01F11/28C02F1/02C02F1/20C02F1/283C02F1/5236C02F9/00C02F2101/14C02F2101/16C02F2103/16C02F2303/02C02F2303/16
Inventor 方稳周欢欢钊现花胡单
Owner 盛隆资源再生(无锡)有限公司
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