Method for improving utilization efficiency of ozone and reducing COD of wastewater

A waste water and ozone technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems affecting the removal effect of hydroxyl radical scavenger, affecting the efficiency of ozone utilization, complicated operation process, etc., to achieve Improve ozone utilization efficiency, increase reaction rate and utilization efficiency, and reduce the effect of total phosphorus content

Inactive Publication Date: 2016-03-02
BEIJING WEICHUANGLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method for removing hydroxyl radical scavenger carbonate has complicated operation process, consumes a lot of acid and alkali, and is expensive.
In addition, carbon dioxide always has a certain solubility in water, and part of carbon dioxide remains in water, especially when reacting at low temperature, the residual amount of carbon dioxide will be larger (such as 10 ℃, when the sum of gas pressure and water vapor pressure is 0.101Mpa, the carbon dioxide Solubility is 2.318g / 1000g water), like this, can affect the removal effect of hydroxyl radical scavenger, thereby influence the utilization efficiency of ozone

Method used

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  • Method for improving utilization efficiency of ozone and reducing COD of wastewater

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Comparison scheme
Effect test

Embodiment 1

[0041] In the ozone oxidation reactor with a volume of 1.2L, the bottom is passed through flocculation pretreated styrene-butadiene rubber waste water (a water outlet is provided on the upper part of the reactor, and the volume of water in the reactor is 0.9L), and the waste water COD is 721mg / L, the total phosphorus is 133mg / L, add 10% calcium oxide suspension prepared with styrene-butadiene rubber wastewater into the reactor inlet pipe, so that the concentration of calcium hydroxide in the wastewater is 2.0g / L, in the reactor Ozone with a concentration of 85mg / L is passed into the bottom of the reactor, and the air intake is 1.5L / min. After the wastewater stays in the ozonation reactor for 35 minutes, the sample is taken. The COD content of the water measured after the sample is filtered with fast filter paper is 48.5mg / L. , the total phosphorus content is 0.04mg / L. As a comparison, the above calcium oxide was converted to 2.15g / L of sodium hydroxide containing equivalent h...

Embodiment 2

[0043] The bottom of the ozonation reactor with a volume of 1.2L is passed into the oilfield heavy oil wastewater after flocculation pretreatment (a water outlet is provided on the upper part of the reactor, and the volume of water in the reactor is 0.9L), and the COD of the wastewater is 332mg / L, the total phosphorus content is 0.02mg / L, in the reactor, add the suspension of 10% calcium oxide prepared with oil field heavy oil wastewater, make the concentration of calcium oxide in the wastewater be 1.65g / L, in the reactor Ozone with a concentration of 85mg / L is passed into the bottom, and the intake rate is 1.5L / min. After the wastewater stays in the ozonation reactor for 20 minutes, it is sampled. The COD content of the water measured after the sample is filtered with fast filter paper is 45.2mg / L. Total phosphorus was not detected. As a comparison, the above calcium oxide was converted to 1.75g / L of sodium hydroxide containing equivalent hydroxide ion concentration, the sam...

Embodiment 3

[0045] In the ozone oxidation reactor with a volume of 1.2L, the acrylonitrile wastewater after flocculation pretreatment is passed into the bottom (a water outlet is provided on the upper part of the reactor, and the volume of water in the reactor is 0.9L), and the COD of the wastewater is 2451mg / L , in the reactor, add the suspension of 10% calcium oxide prepared with acrylonitrile waste water, make the concentration of calcium hydroxide in the waste water be 10g / L, pass into the ozone of 85mg / L concentration at the bottom of the reactor, carry out The gas volume is 1.5L / min. After the wastewater stays in the ozonation reactor for 90 minutes, the sample is taken. The COD content of the water measured after the sample is filtered with fast filter paper is 49.7mg / L. As a comparison, the above calcium oxide was converted into sodium hydroxide containing equivalent hydroxide ion concentration, and the amount of sodium hydroxide was 10.75g / L to carry out the same experiment, and t...

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Abstract

The invention provides a method for increasing the utilization efficiency of ozone and reducing the COD of wastewater. According to the method, a chemical agent for removing a hydroxyl radical capture agent generated in base catalysis ozone advanced oxidation is added into the wastewater so as to achieve the purposes. Calcium ions, barium ions and the like are added into a base catalysis ozone oxidation system, so that the hydroxyl radical capture agent becomes precipitate to be separated from the water and loses the capacity for capturing hydroxyl radicals, and accordingly the utilization efficiency of ozone is improved. In addition, part of organic acid generated by the calcium ions, the barium ions and the like and the ozone oxidation wastewater precipitates to be separated from the water, so that the consumption of ozone is reduced, and the utilization efficiency of the ozone treatment wastewater is indirectly improved. By means of the method, the reaction rate of ozone can be obviously increased, the utilization efficiency of ozone can be obviously improved, reaction time can be shortened, cost can be reduced, organic matter in the wastewater can be thoroughly mineralized, and the COD and the total phosphorus content of the wastewater can be significantly reduced.

Description

technical field [0001] The invention relates to a method for treating industrial waste water, in particular to a method for improving ozone utilization efficiency and reducing waste water COD. Background technique [0002] Ozone reacts with substances in two ways, direct and indirect, in water. The direct reaction is a selective reaction, and its rate constant is very low, generally in the range of 1.0-10 3 m -1 the s -1 Within the range, the reaction with pollutants in water is slow, while the indirect reaction is the reaction in which ozone decomposes to generate hydroxyl radicals. The reaction between hydroxyl radicals and organic matter is a non-selective reaction with a fast reaction speed and a rate constant of 10 8 -10 10 m -1 the s -1 . From the characteristics of the two modes of reaction between ozone and organic matter in water, the indirect reaction of ozone is of great significance, especially in the treatment of wastewater that is difficult to oxidize and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/78C02F101/10C02F101/34
CPCC02F1/5209C02F1/78C02F2001/5218C02F2101/10C02F2101/34C02F2103/343C02F2209/08C02F2209/23C02F2305/023C02F1/5236C02F1/66C02F1/725C02F2101/105
Inventor 黄尧奇
Owner BEIJING WEICHUANGLI TECH CO LTD
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