Treatment method of organic nitrogen wastewater

A treatment method, organic nitrogen technology, applied in water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the impact on the treatment effect of sewage treatment plants, the impact of wastewater reuse, and the impact of biochemical systems and other problems, to achieve the effect of improving electrolysis efficiency and oxidation efficiency, reducing organic nitrogen compounds and refractory organic matter, and fast reaction speed

Pending Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high salt content and poor biochemical properties of this type of wastewater, mixing with other wastewater not only affects the reuse of wastewater, but also impacts the biochemical system and affects the treatment effect of the entire sewage treatment plant. Therefore, it is necessary to study this type of wastewater. A Better Way to Treat Wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The wastewater produced by a certain catalyst contains high concentrations of bromine and organic nitrogen at the same time. The conventional treatment cannot meet the discharge requirements, which seriously affects the normal production of the enterprise. The organic nitrogen concentration of the wastewater is 420mg / L, the total nitrogen is 440mg / L, the bromide ion is 1890mg / L, and the pH is 3.9. The operating conditions are determined as follows: graphite is used as the positive electrode, stainless steel is used as the negative electrode, the current intensity is 40A, the residence time of the wastewater in the reactor is 40min, the organic nitrogen in the treated wastewater is 32.1mg / L, and the nitrate is 405.5mg / L. Nitrogen is 437.5mg / L, which can be mixed and diluted with other nitrate-free wastewater in the factory area, and then enter the biochemical system to remove total nitrogen.

Embodiment 2

[0038] Treatment of a production wastewater containing organic nitrogen fungicides, organic nitrogen in wastewater 80.5mg / L, bromine-containing wastewater in a chemical plant, Br -1 488.5mg / L, mixed with organic nitrogen wastewater at a ratio of 1:1, the pH value of the mixed solution is 5.2, and enters the treatment unit. The operating conditions are determined as follows: the electrochemical treatment unit uses graphite as the positive electrode, stainless steel as the negative electrode, and the current intensity is 40A, the electrolysis time in the reactor is 30min, the organic nitrogen of the treated wastewater is 19.2mg / L, and the nitrate is 105.0mg / L, which can be further removed by the biochemical unit to remove nitrate nitrogen.

Embodiment 3

[0040] The organic nitrogen in wastewater is 239.2mg / L, and the B / C is 0.05. The bromine-containing wastewater of a chemical plant next to the factory has a bromine ion concentration of 3855.2mg / L. Mix with organic nitrogen waste water at a ratio of 1:1, the pH value of the mixed solution is 9.0, and the operating conditions are determined as follows: graphite is used as the positive electrode, stainless steel is used as the negative electrode, the current intensity is 40A, the residence time of the waste water in the reactor is 30 minutes, and the treated waste water The organic nitrogen dropped to 7.9mg / L, and the B / C was 0.41. The treated wastewater is mixed and diluted with other nitrate-free wastewater in the plant area, and then enters the biochemical system to remove the total nitrogen brought by nitrate nitrogen.

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PUM

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Abstract

The invention discloses a treatment method of degradation-resistant organic nitrogen wastewater. The method comprises the following steps: adding wastewater containing degradation-resistant organic nitrogen and bromine-containing wastewater into an electrolytic cell according to a certain ratio, carrying out an electrolytic reaction for a certain period of time, oxidizing bromide ions in the wastewater into bromine, rapidly reacting bromine with water to generate hypobromous acid with a very strong oxidizing performance, and oxidizing and degrading organic nitrogen in the wastewater by hypobromous acid. After being treated by the method, more than 90% of degradation-resistant organic nitrogen can be removed. According to the method, waste is treated with waste, the treatment cost is low, the pH application range is wide, and the method can be widely applied to treatment of various degradation-resistant organic nitrogen-containing wastewater.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating refractory organic nitrogen wastewater. Background technique [0002] Excessive nitrogen in wastewater, like phosphorus, can also cause eutrophication of water, which is one of the main pollutant indicators strictly restricted by the state. On July 1, 2017, the state enforced the new standards "GB31570-2015 Petroleum Refining Industry Pollutant Discharge Standard" and "GB31571-2015 Petrochemical Industry Pollutant Discharge Standard", requiring petrochemical enterprises to have total nitrogen in the total discharge outlet of industrial wastewater ≤ 40mg / L (petroleum refining) total nitrogen ≤ 30mg / L (petrochemical industry). [0003] Nitrogen in wastewater mainly exists in the form of ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and organic nitrogen. The removal methods and difficulty of different forms of nitrogen are different. Ammonia nitrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467C02F1/76C02F101/38C02F101/12
CPCC02F1/461C02F1/4674C02F1/766C02F2101/12C02F2101/38
Inventor 马欣高峰曹晓磊
Owner CHINA PETROLEUM & CHEM CORP
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