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Oxidizing method for nitrite ions in desulfurization and denitrification waste liquid

A technology of nitrite ion, desulfurization and denitrification, which is applied in the field of oxidation of nitrite ion in desulfurization and denitrification waste liquid, can solve the problems of recycling valuable nitrogen salts, cumbersome reaction steps, and numerous intermediate products, and achieve broad industrial application The effect of prospect, high efficiency and good economic benefits

Inactive Publication Date: 2018-05-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN 102225793 A discloses a method for synchronously removing ammonia nitrogen, nitrate nitrogen and nitrite nitrogen in water, first adjusting the pH value and dissolved oxygen of the wastewater, and then treating it with ultraviolet light, and finally being degraded into N 2 and N 2 O gas, but this method does not recycle the valuable nitrogen salt and the reaction steps are cumbersome, and there are many intermediate products

Method used

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Embodiment 1

[0059] This embodiment provides a method for efficiently oxidizing nitrite ions in desulfurization and denitrification waste liquid, the method comprising the following steps:

[0060] (1) Carry out solid-liquid separation and pH adjustment to remove impurities from calcium desulfurization and denitrification waste liquid, and the anions contained in the obtained preliminary purification liquid are NO 3 - and NO 2 - , the cation is Ca 2+ , the pH value of the preliminary purification solution is 12, and the total concentration of salt contained is 30wt%;

[0061] (2) adjusting the pH value of the preliminary purification solution obtained in step (1) to 6 with nitric acid;

[0062] (3) in the solution that step (2) obtains, add concentration to be the hydrogen peroxide of 20wt%, the volume ratio of adding hydrogen peroxide and the solution volume that step (2) obtains is 0.1:1, the solution that will contain hydrogen peroxide is passed into ultraviolet oxidizing device sim...

Embodiment 2

[0065] This embodiment provides a method for efficiently oxidizing nitrite ions in desulfurization and denitrification waste liquid, the method comprising the following steps:

[0066] (1) Carry out solid-liquid separation and pH adjustment to remove impurities from the magnesium desulfurization and denitrification waste liquid, and the anion contained in the obtained preliminary purification liquid is NO 3 — and NO 2 — , the cation is Mg 2+ , the pH value of the preliminary purification solution is 4, and the total concentration of contained salt is 10wt%;

[0067] (2) adjusting the pH value of the preliminary purification solution obtained in step (1) to 5.2 with magnesium hydroxide;

[0068] (3) in the solution that step (2) obtains, add concentration to be the hydrogen peroxide of 15wt%, the solution volume ratio that the volume of adding hydrogen peroxide and step (2) obtains is 0.15:1, simultaneously the solution that contains hydrogen peroxide is passed into ultravi...

Embodiment 3

[0071] This embodiment provides a method for efficiently oxidizing nitrite ions in desulfurization and denitrification waste liquid, the method comprising the following steps:

[0072] (1) Separating solid-liquid and adjusting the pH to remove impurities from the sodium desulfurization and denitrification waste liquid, the anion contained in the obtained preliminary purification liquid is NO 3 — and NO 2 — , the cation is Na + , the pH value of the preliminary purification solution is 10.5, and the total concentration of salt contained is 55wt%;

[0073] (2) adjusting the pH value of the preliminary purification solution obtained in step (1) to 6.5 with nitric acid;

[0074] (3) in the solution that step (2) obtains, add concentration to be the hydrogen peroxide of 30wt%, the solution volume ratio that the volume of adding hydrogen peroxide and step (2) obtains is 0.4:1, the solution that will contain hydrogen peroxide is passed into ultraviolet oxidizer simultaneously , ...

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Abstract

The invention provides an oxidizing method for nitrite ions in desulfurization and denitrification waste liquid. The oxidizing method comprises the following steps of firstly carrying out solid-liquidseparation and deep dedusting on the desulfurization and denitrification waste liquid, then adjusting the pH value of the solution to be in the suitable range for oxidation treatment, completely oxidizing nitrites in the waste liquid into nitrates through a manner of combining an oxidizing agent and ultraviolet light to produce free radical, and finally obtaining a nitrate product. The oxidizingmethod provided by the invention has the beneficial effects that the operation is simple and convenient, the cost is low, the oxidizing efficiency is high, the problem of secondary pollution easily caused by the nitrite waste liquid is solved, and the recycling of all nitrogen elements in the waste liquid is realized, so that the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to a method for oxidizing nitrite ions in desulfurization and denitrification waste liquid. Background technique [0002] In recent years, with the increasing emphasis on the environment, sulfur oxides and nitrogen oxides in the flue gas need to be removed before being discharged, so desulfurization and denitrification technology has become a research hotspot. Currently, most of the desulfurization and denitrification technologies disclosed are carried out separately. The mainstream technologies of wet flue gas desulfurization include limestone-gypsum method, ammonia method, double alkali method and magnesium method; The former is divided into two types: selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). Among them, SCR is the most commonly used denitrification technology at present. Although this technology has high denitrification efficienc...

Claims

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Application Information

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IPC IPC(8): C01D9/00C01D9/18C01F5/38C01F11/36C01G45/08
Inventor 李会泉陈艳王晨晔王兴瑞孟子衡
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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