A kind of advanced treatment method of epichlorohydrin waste water

A technology of epichlorohydrin and advanced treatment, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to reduce the temperature of wastewater, simplify the treatment process, and reduce the COD concentration of effluent Effect

Active Publication Date: 2019-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no economical, mature and reliable treatment method for calcium ions in epichlorohydrin wastewater

Method used

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  • A kind of advanced treatment method of epichlorohydrin waste water
  • A kind of advanced treatment method of epichlorohydrin waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A certain enterprise produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 1500mg / L, B / C: 0.20, the calcium ion concentration is 7500mg / L, the total salt content: 2.0%, and the temperature is 80 ℃. Adopt the method of the present invention to carry out treatment, first adopt conventional microporous aeration way to pass in excess carbon dioxide gas, then mix this part of cooling waste water with part of raw waste water to be treated, use the flow rate of raw waste water to control the temperature of mixed waste water at 60~ 70°C, and rely on the system to automatically replenish sodium hydroxide to control the pH between 7 and 8 during the mixing reaction process. The calcium ion concentration in the treated wastewater is 1400mg / L, and the removal rate is 81.3%. Then add ammonium sulfate 2600mg / L to the wastewater to produce calcium sulfate precipitation and achieve the removal of more than 9...

Embodiment 2

[0030] A certain enterprise produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 1500mg / L, B / C: 0.20, the calcium ion concentration is 7500mg / L, the total salt content: 2.0%, and the temperature is 80 ℃. The method of the present invention is used for treatment, and the method of dissolved air flotation is adopted, and a large amount of carbon dioxide is dissolved after part of the cooling wastewater passes through the dissolved air tank. The working pressure of the dissolved air flotation is 0.4-0.6 MPa, and then released into the subsequent air flotation tank Fully mix with the original wastewater, use the flow of the original wastewater to control the temperature of the mixed wastewater at 60-70°C, and rely on the system to automatically replenish sodium hydroxide to control the pH between 7 and 8 during the mixing reaction process. After treatment The concentration of calcium ions in the wastew...

Embodiment 3

[0032] A company produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 2500mg / L, B / C: 0.4, the calcium ion concentration is 9000mg / L, the total salt content: 3.0%, and the temperature is 100 ℃. Adopt the method of the present invention to process, adopt the mode of dissolved air flotation, dissolve a large amount of carbon dioxide after partly cooling waste water passes through dissolved air tank, the working pressure of dissolved air flotation is 0.6~0.8MPa, releases in the follow-up air flotation tank and The raw wastewater is fully mixed, and the flow rate of the raw wastewater is used to control the temperature of the mixed wastewater at 70-80°C, and the system automatically replenishes potassium hydroxide to control the pH between 7 and 8 during the mixing reaction process. The concentration of calcium ions in the wastewater is 1300mg / L, and the removal rate is 85.6%; then a small amount of amm...

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Abstract

The invention discloses a method for deeply processing chloropropylene oxide waste water. The method comprises the following steps: introducing excess CO2 gas in partial cooled to-be-treated original waste water, rapidly mixing the waste water and partial original waste water so that the temperature of the mixed waste water is greater than 60 DEG C, removing calcium ion precipitate; adding ammonium sulfate in an effluent for precipitating to remove the calcium ions, performing biochemical treatment with the precipitates together; and adding a microbe growth promoter during a biochemical treatment process, wherein the promoter comprises metal salt and a polyamines substance, the metal salt is 40-100 weight parts, the polyamines substance is 5-30 weight parts, and the metal salt is composed of calcium salt, the copper salt, the magnesium salt and / or ferrous salt. By introducing excess CO2 and using original waste water alkalinity and waste heat, most calcium ions can be removed through precipitating, then ammonium sulfate is added for removing calcium, the waste water deep processing is realized by adding the microbe growth promoter, and the method has the characteristics of simple treatment process, high processing efficiency, and low cost.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an advanced treatment method for epichlorohydrin wastewater. Background technique [0002] Epichlorohydrin is an important intermediate in organic synthesis, mainly used in the production of fine chemical products such as epoxy resin, synthetic glycerin, and chlorohydrin rubber. The high-temperature chlorination of propylene is a classic method for the industrial production of epichlorohydrin. The sewage generated in the process has the characteristics of large water volume, high salinity, and high calcium ion concentration. It is difficult and expensive to treat alone. At present, relevant enterprises basically adopt biochemical treatment process after mixing with wastewater from other production units, but this often leads to calcium deposition in the biochemical treatment system, which causes the increase of inorganic components in activated sludge and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/36
Inventor 高会杰郭志华孙丹凤赵胜楠李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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