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Processing method of wastewater containing salts and chloride ions

A chlorine ion and wastewater technology, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of large catalyst dosage, large amount of waste residue, unstable wastewater treatment effect, etc. problems, to achieve a more stable treatment effect, meet environmental protection requirements, and reduce the amount of production

Active Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of catalyst added in this method is large, the amount of waste residue generated is large, and the treatment effect on wastewater is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment is used to illustrate the method for treating salt-containing and chloride-containing wastewater provided by the present invention.

[0032] The wastewater treated in this embodiment is the third-production wastewater of a certain oil field, the conductivity of the wastewater is 9000 μs, and the chloride ion concentration is 2000 mg / L.

[0033] Adjust the pH value of the wastewater to be treated to 4 with an aqueous sulfuric acid solution (with a concentration of 98% by mass) and place it in an electrochemical reactor (the anode is SnO 2 / Ti, the cathode is stainless steel; the current intensity is 200A / m 2 ), and added a metal ion catalyst ferrous chloride (the molar ratio of the ferrous ion to the chloride ion in the wastewater is 0.05:1) and the catalyst protectant ethylenediaminetetraacetic acid and citric acid (quality The ratio is 2:1) (the mass ratio of the catalyst to the catalyst protective agent is 1:0.5), and the mixture is uniformly mixed, and the ...

Embodiment 2

[0042] This embodiment is used to illustrate the method for treating salt-containing and chloride-containing wastewater provided by the present invention.

[0043] The wastewater treated in this embodiment is the electrical desalination wastewater of a refinery, the conductivity of the wastewater is 8000 μs, and the chloride ion concentration is 1800 mg / L.

[0044] Adjust the pH value of the wastewater to be treated to 5 with an aqueous hydrochloric acid solution (mass percentage concentration of 30%) and place it in an electrochemical reactor (the anode is PbO 2 / Ti, the cathode is stainless steel; the current intensity is 150A / m 2 ), and added the catalyst ferrous chloride (the molar ratio of the divalent iron ion to the chloride ion in the wastewater is 0.01:1) and the catalyst protective agent ethylenediaminetetraacetic acid and oxalic acid (the mass ratio is 3 :1) (the mass ratio of the catalyst and the catalyst protective agent is 1:0.08), and the mixture is evenly mixed, and ...

Embodiment 3

[0053] The examples are used to illustrate the wastewater treatment method provided by the present invention.

[0054] The wastewater was treated according to the method of Example 1, except that the metal ion catalyst used was ferrous sulfate, the molar ratio of metal ion to chloride ion in the wastewater was 0.1:1, and the catalyst protectant was oxalic acid and citric acid (the mass ratio was 1:2), the mass ratio of catalyst to catalyst protective agent is 1:2, and the current intensity is 300A / m 2 , The residence time is 30 minutes; the COD value of the treated wastewater is 48mg / L, the COD removal rate reaches 92%, and the B / C ratio of the treated wastewater reaches 0.36.

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Abstract

The invention discloses a processing method of wastewater containing salts and chloride ions. According to the invention, the wastewater, a catalyst, and a catalyst protective agent are subjected to a mixing treatment under an electrochemical catalytic oxidation condition, such that B / C of processed wastewater is higher than 0.3; and the processed wastewater is subjected to solid-liquid separation. The catalyst is a metal ion catalyst. The catalyst protective agent can improve the utilization rate of the catalyst. According to the invention provided by the invention, catalyst addition amount is low, waste slag production amount is low, wastewater COD can be effectively reduced, and wastewater biodegradability is improved.

Description

Technical field [0001] The invention relates to a method for treating waste water containing salt and chloride ions. Background technique [0002] A type of wastewater with high salt content and high chloride ion content is often produced in the process of industrial production and life, such as: electric desalination wastewater in refineries, concentrated water produced in the process of industrial reverse osmosis, and high content in oil production. Salt, oily wastewater and high-salt printing and dyeing wastewater in the dye industry. Under normal circumstances, the salt content in this type of wastewater makes the conductivity of the wastewater as high as tens of thousands of μs, and its chloride ion content is also greater than 1000 mg / L, and most of the organic matter in the wastewater is difficult to degrade. Due to the poor biodegradability of this type of wastewater and the excessively high salt content and chloride ion content of the wastewater, which inhibits the grow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/58
Inventor 高峰杨青
Owner CHINA PETROLEUM & CHEM CORP
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