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High calcium organic wastewater treatment method

A technology of organic wastewater and treatment methods, applied in the direction of extraction water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve the effect of resource reuse, low raw material consumption, and COD value reduction

Active Publication Date: 2013-06-05
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of high-calcium organic wastewater treatment and extract useful chemical products at the same time, the present invention proposes a treatment method for high-calcium organic wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the acidification reactor, the industrial wastewater containing 0.6% calcium acetate and phosphoric acid were mixed in a molar ratio of 1:0.4, and acidification was carried out at 75°C for 10 minutes. Filter the mixed material with normal-pressure filter paper to separate the crude calcium phosphate product, wash the crude product to remove impurities, and dry it naturally to obtain a semi-finished product of calcium phosphate. At the same time, the filtrate was mixed with the extractant system consisting of 3 parts of trioctylamine, 5 parts of n-butanol and 3 parts of kerosene in the extraction tank with a mass ratio of 1:2, and the liquid-liquid extraction reaction under normal temperature conditions was carried out for 30 minute. The upper layer material is distilled under reduced pressure at a vacuum of 0.06MPa, and the fraction with a gas phase temperature of 60-100°C is collected. The fraction is naturally settled and separated, and the lower layer obtains a 43...

Embodiment 2

[0021] In the acidification reactor, the industrial wastewater containing 10% calcium propionate and sulfuric acid were mixed in a molar ratio of 1:0.55, and acidification was carried out at 50°C for 50 minutes. Centrifuge the mixed material at a speed of 3000 rpm to separate the crude calcium sulfate product, wash the crude product to remove impurities, and dry it naturally to obtain a semi-finished product of calcium sulfate. At the same time, the filtrate is mixed with the extractant system consisting of 4 parts of trioctylamine, 3 parts of n-pentanol and 3 parts of kerosene in the extraction tank with a mass ratio of 2:3, and the liquid-liquid extraction under normal temperature conditions is carried out. The extraction reaction was carried out for 40 minutes. The upper material is distilled under reduced pressure at a vacuum of 0.065MPa, and the fraction with a gas phase temperature of 60-100°C is collected. The fraction is naturally settled and separated, and the lower l...

Embodiment 3

[0023] In the acidification reactor, the industrial wastewater containing 12% calcium formate and sulfuric acid were mixed in a molar ratio of 1:1, and acidification was carried out at 60° C. for 45 minutes. Centrifuge the mixed material at a speed of 2000 rpm to separate the crude calcium sulfate product, wash the crude product to remove impurities, and dry it naturally to obtain a semi-finished product of calcium sulfate. At the same time, the filtrate is mixed with the extractant system consisting of 4 parts by mass of tripentylamine, 5 parts of n-decyl alcohol and 1 part of chloroform in the extraction tank at a ratio of 5:1 by mass, and the liquid-liquid extraction under normal temperature conditions is carried out. The extraction reaction was 60 minutes. The upper layer material is distilled under reduced pressure at a vacuum of 0.04MPa, and the fraction with a gas phase temperature of 60-100°C is collected, and the fraction is naturally settled and separated. The lower ...

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Abstract

The invention relates to a high calcium organic wastewater treatment method, which comprises: mixing industrial wastewater containing 0.1-20% by mass of organic calcium carboxylate and an inorganic acid according to a molar ratio of 1:1-1:0.2, carrying out an acidification reaction at a temperature of 50-90 DEG C, and separating the resulting mixed material to obtain an inorganic calcium salt crude product; carrying out a liquid-liquid extraction reaction on an aqueous solution containing the organic carboxylic acid and a small amount of the inorganic calcium salt compound to generate an organic carboxylic acid complex having a boiling point of more than a boiling point of the organic carboxylic acid; and carrying out pressure reduction distillation on the upper layer material containing the organic carboxylic acid complex, collecting a distillate with a gas temperature of 60-100 DEG C, and carrying out nature sedimentation separation on the distillate, wherein an organic carboxylic acid aqueous solution with a mass fraction of 20-85% is obtained from the lower layer, and the upper layer material is mixed with the residual liquid on the bottom of a pressure reduction distillation kettle to obtain a recycled extraction agent. The method has characteristics of simple process, less raw material consumption, high yield, high production efficiency, easy reaction process enlargement, and source re-utilization achievement.

Description

technical field [0001] The invention relates to a method for treating industrial waste water, in particular to a method for treating high-calcium organic waste water. Background technique [0002] Due to the needs of environmental protection and human survival and development, since the "Eleventh Five-Year Plan", the government has gradually increased the intensity of emission reduction, mainly by adjusting the economic structure, introducing advanced emission reduction technologies, and actively improving environmental quality. During the "Eleventh Five-Year Plan" period, the state proposed to focus on controlling the discharge of water pollutant COD, which has become one of the main restrictive environmental indicators. During the treatment of industrial wastewater from refineries, there are strict upper limit requirements for the organic content in the industrial wastewater discharged from each device. Excessive organic content will cause high COD in industrial water, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/32C01F11/46C02F1/26
Inventor 牛春革甄新平秦本记马忠庭代敏张海兵乔文
Owner PETROCHINA CO LTD
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