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High-salinity alkali liquor pool wastewater treatment process

A technology of salinity lye and high salinity, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, alkali metal compounds, etc., can solve the problem of yellow crystal color, inability to directly recover sodium sulfite products, difficult Fluorine drops below 30ppm, etc.

Active Publication Date: 2022-07-29
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The raw water contains fluorine ions, and it is difficult to reduce the fluorine to below 30ppm by directly removing fluorine from the raw water
[0005] 2. There are other impurity ions in the raw water, and the qualified sodium sulfite product cannot be recovered directly, and the crystal color is yellow

Method used

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  • High-salinity alkali liquor pool wastewater treatment process
  • High-salinity alkali liquor pool wastewater treatment process
  • High-salinity alkali liquor pool wastewater treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 500mL of lye pool wastewater, in which fluorine: 240ppm, chlorine 3.4g / L, sodium sulfite content 21.6%, hydrogen peroxide content 35.3%; calculate the amount of hydrogen peroxide used 82.5mL, and the amount of lime added 0.508g. Slowly add hydrogen peroxide dropwise at a rate of 5ml / min, control the reaction temperature to be less than 60°C, and detect the pH value change. After the solution becomes acidic, add liquid alkali to adjust pH=5.5. After the dropwise addition of hydrogen peroxide is completed, stir for 10min and detect the sodium sulfite content of 0%. (not detected), weigh lime and dissolve it in 50 mL of water, slowly add it to the solution, stir and react for 1 h, take a sample to detect the fluoride ion content of 22 ppm, weigh 0.3 g of sodium carbonate and add it to the solution and stir for 40 min, and take a sample to detect calcium ions The content is 47ppm, qualified, and suction filtration is started. The temperature of the filtrate is 37℃, and ...

Embodiment 2

[0036] Take 300mL of lye pool wastewater, including fluorine: 500ppm, chlorine 7.8g / L, sodium sulfite content 15.7%, hydrogen peroxide content 34.7%; the calculated amount of hydrogen peroxide used is 36.6mL, and the amount of lime added is 0.602g. Slowly add hydrogen peroxide dropwise at a rate of 5ml / min, control the reaction temperature to be less than 60°C, and detect the pH value change. After the solution becomes acidic, add liquid alkali to adjust pH=5.3. After the dropwise addition of hydrogen peroxide is completed, stir for 10min to detect the sodium sulfite content of 0%. (not detected), weigh lime and dissolve it in 50 mL of water, slowly add it to the solution, stir and react for 1 h, take a sample to detect the fluoride ion content of 11 ppm, weigh 0.27 g of sodium carbonate and add it to the solution and stir for 40 minutes, and take a sample to detect calcium ions The content was 59ppm, qualified, and suction filtration was started. The temperature of the filtrat...

Embodiment 3

[0038] Take 1000mL of lye pond wastewater, including fluorine: 877ppm, chlorine 17.9g / L, sodium sulfite content 30.8%, hydrogen peroxide content 35.9%; calculate the amount of hydrogen peroxide used 231.5mL, and the amount of lime added 4.01g. Slowly add hydrogen peroxide dropwise at a rate of 5mL / min, control the reaction temperature to be less than 60°C, and detect the pH value change. After the solution becomes acidic, add liquid alkali to adjust pH=5.9. After the hydrogen peroxide is added dropwise, stir for 10min to detect the sodium sulfite content of 0%. (not detected), weigh lime and dissolve it in 50mL of water, slowly add it into the solution, stir and react for 1h, take a sample to detect the fluoride ion content of 25ppm, weigh 1.1g of sodium carbonate and add it to the solution and stir for 40min, and take a sample to detect calcium ions The content is 22ppm, qualified, and suction filtration is started. The temperature of the filtrate is 51℃, and then it is adsorb...

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Abstract

The invention provides a high-salinity alkali liquor pool wastewater treatment process, and belongs to the technical field of waste liquid treatment. The method comprises the following steps: adding hydrogen peroxide into wastewater and stirring; adding a defluorination agent into the obtained reaction liquid, and performing solid-liquid separation after the reaction is completed to obtain filtrate 1 and solid calcium fluoride; adding a calcium removal agent into the filtrate 1, mixing, reacting and carrying out solid-liquid separation to obtain precipitate and filtrate 2; performing activated carbon adsorption decoloration on the filtrate 2 to obtain a sodium sulfate solution, and regenerating and recycling the activated carbon after adsorption decoloration; carrying out negative pressure concentration on the sodium sulfate solution, and then carrying out solid-liquid separation to obtain a concentrated solution and sodium sulfate crystals; carrying out sulfuric acid pretreatment on the concentrated solution, reacting, carrying out solid-liquid separation to obtain solid impurities and filtrate 3, carrying out negative pressure concentration on the filtrate 3, adding sulfuric acid into the concentrated solution to adjust the acidity, supplementing water, continuously carrying out negative pressure concentration to obtain hydrochloric acid fraction water and a concentrated solution, and crystallizing the concentrated solution to obtain sodium sulfate. The salt in the alkali liquor pool is treated, waste is turned into wealth, the salt pressure of the alkali liquor pool is relieved, and the outsourcing landfill amount is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment, and in particular relates to a waste water treatment process of a high-salt alkali liquor pool. Background technique [0002] With the rapid development of my country's economy, the amount of solid waste in my country is huge, and there are many kinds of it, and there are many sub-sectors involved, among which incineration and hazardous waste disposal are two important sub-sectors. In the incineration industry, there are domestic waste incineration, organic miscellaneous material incineration, etc. Some hazardous waste disposal companies will select materials with relatively single components for incineration when incinerating materials. For example, the materials mainly contain sulfur and almost no other ions. After incineration, the waste gas is sprayed, absorbed and settled by the lye spray tower, and then processed to obtain a relatively pure sodium sulfite product, or the sulf...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01D5/00C01D5/16
CPCC02F9/00C01D5/00C01D5/16C02F1/722C02F1/66C02F1/583C02F1/58C02F1/283C02F2301/08C02F2303/16
Inventor 仲亚洲虞恺
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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