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Method for efficiently converting nitrate nitrogen in nitrate waste liquid into nitrite nitrogen

A technology of nitrite nitrogen and nitrate, applied in chemical instruments and methods, light water/sewage treatment, water pollutants, etc., can solve problems such as secondary pollution, improve waste liquid, etc., achieve high-efficiency conversion, and simple operation process , the effect of a wide range of sources

Active Publication Date: 2019-10-01
KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an organic annihilation agent is introduced in the treatment of nitrate waste liquid by electron beam irradiation, although the problem of hydroxide radical oxidation can be solved to a certain extent, it will increase the COD value of the waste liquid and cause secondary pollution.

Method used

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  • Method for efficiently converting nitrate nitrogen in nitrate waste liquid into nitrite nitrogen
  • Method for efficiently converting nitrate nitrogen in nitrate waste liquid into nitrite nitrogen
  • Method for efficiently converting nitrate nitrogen in nitrate waste liquid into nitrite nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Effect of solid-liquid ratio of sodium sulfide and nitrate waste liquid on the disposal performance of electron beam irradiated nitrate waste liquid

[0020] Preparation of simulated nitrate waste liquid: Weigh sodium nitrate and water according to the solid-to-liquid ratio of 5:100 mg / mL, dissolve sodium nitrate in water, and stir under sealed conditions until the sodium nitrate is completely dissolved to obtain simulated nitrate waste liquid.

[0021] Disposal of nitrate simulated waste liquid: according to the ratio of solid to liquid: 0.01:1mg / mL, 0.015:1mg / mL, 0.018:1mg / mL, 0.02:1mg / mL, 0.03:1mg / mL, 0.04:1mg / mL, 0.05:1mg / mL, 0.052: 1mg / mL, 0.055: 1mg / mL, 0.06: 1mg / mL respectively weighed sodium sulfide and nitrate simulated waste liquid, dissolved sodium sulfide into the nitrate waste liquid, and stirred it under sealed condition until it vulcanized Sodium is completely dissolved to obtain sodium sulfide mixed with nitrate liquid. Wherein, the nitrate c...

Embodiment 2

[0030] Example 2 Influence of injection height of nitrate simulated waste liquid in reaction tank on disposal performance of electron beam irradiated nitrate simulated waste liquid

[0031] Preparation of simulated nitrate waste liquid: Weigh sodium nitrate and water according to the solid-to-liquid ratio of 15:100 mg / mL, dissolve sodium nitrate in water, stir under sealed conditions until sodium nitrate is completely dissolved, and obtain simulated nitrate waste liquid

[0032] Disposal of simulated nitrate waste liquid: Weigh sodium sulfide and simulated nitrate waste liquid according to the solid-to-liquid ratio of 0.05:1mg / mL, dissolve sodium sulfide into simulated nitrate waste liquid, and stir until sodium sulfide is completely dissolved under sealed conditions , to get sodium sulfide mixed with nitrate simulated waste liquid. Wherein, the nitrate concentration in the above nitrate simulation waste liquid is 150mg / L. The sodium sulfide mixed with nitrate simulated waste...

Embodiment 3

[0037] Example 3 Effect of carbon dioxide gas ventilation on the disposal performance of electron beam irradiated nitrate simulated waste liquid

[0038] Preparation of simulated nitrate waste liquid: Weigh sodium nitrate and water according to the solid-to-liquid ratio of 25:100 mg / mL, dissolve sodium nitrate in water, stir under sealed conditions until sodium nitrate is completely dissolved, and obtain simulated nitrate waste liquid

[0039] Disposal of simulated nitrate waste liquid: Weigh sodium sulfide and simulated nitrate waste liquid according to the solid-to-liquid ratio of 0.05:1mg / mL, dissolve sodium sulfide into simulated nitrate waste liquid, and stir until sodium sulfide is completely dissolved under sealed conditions , to get sodium sulfide mixed with nitrate simulated waste liquid. Wherein, the nitrate concentration in the above-mentioned nitrate simulated waste liquid is 250 mg / L. The sodium sulfide mixed with nitrate simulated waste liquid was introduced int...

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Abstract

The invention discloses a method for efficiently converting nitrate nitrogen in nitrate waste liquid into nitrite nitrogen. The method includes the following steps that sodium sulfide is weighed, dissolved in the nitrate waste liquid and stirred under a sealing condition until the sodium sulfide is completely dissolved, and sodium sulfide-doped nitrate waste liquid is obtained; carbon dioxide gasis introduced into the sodium sulfide-doped nitrate waste liquid, and then the mixture is irradiated by using electron beams. The method is simple in operation process, reagents in use are wide in source, and the method can be directly commercially popularized. According to the method, on the basis of improving a traditional electron beam radiation wastewater treatment process, the reducing environment of an irradiated water body is indirectly created by adding sodium sulfide and the carbon dioxide gas, so that the high-efficiency conversion of the nitrate in the waste liquid into nitrite is realized. According to the method, the nitrate conversion rate of 98% or above, the nitrogen conversion efficiency of 57% or above and the nitrite generation rate of 43% or above can be achieved at most. The method provides a brand new idea for disposing the nitrate waste liquid.

Description

technical field [0001] The invention belongs to the field of inorganic waste liquid disposal, and in particular relates to a method for efficiently converting nitrate nitrogen in nitrate waste liquid into nitrite nitrogen. Background technique [0002] For nitrate waste liquid, traditionally, biochemical methods are mainly used to denitrify it under the conditions of anaerobic and external organic carbon sources. Under the action of anaerobic bacteria, the external organic carbon source is used as the electron donor, and nitrate is used as the electron acceptor to realize the conversion of nitrate to nitrite and nitrogen. Although this process is widely used and relatively mature, there are still many problems in the process of use, such as: a large amount of organic carbon source dosing, a sudden increase in the COD value of the waste liquid caused by the residual organic carbon source, long denitrification cycle, denitrification The efficiency is low, and the bacterial po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/70C02F101/16
CPCC02F1/305C02F1/70C02F2101/163
Inventor 黄涛刘万辉张树文刘龙飞宋东平陶骏骏周璐璐徐娇娇
Owner KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
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