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Treatment method of wastewater with high salinity and high organic matters

A treatment method and organic matter technology, applied in the direction of heating water/sewage treatment, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of reducing waste water, unable to solve the problem of concentrated water treatment, etc., to achieve the reduction of membrane pollution, achieve continuous and stable operation, and reduce the effect of membrane fouling tendency

Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention: the waste lye wet oxidation wastewater in ethylene production contains high salinity and high organic matter, and the conventional reverse osmosis desalination method cannot solve the concentrated water treatment problem, so it is necessary to select an applicable pretreatment method, Reduce the organic matter of this wastewater

Method used

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  • Treatment method of wastewater with high salinity and high organic matters
  • Treatment method of wastewater with high salinity and high organic matters
  • Treatment method of wastewater with high salinity and high organic matters

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The waste lye wet oxidation wastewater in an ethylene production, the water quality indicators of each pollutant in the wastewater are shown in Table 1:

[0038]

[0039] The waste water is treated as follows:

[0040] (1) First use a sulfuric acid solution with a volume fraction of 98% to adjust the pH of the wastewater to 2, and add H according to the COD concentration in the wastewater 2 o 2 The concentration is 155mg / L, Fe 2+ The dosing concentration is 52 mg / L, and the two chemicals are added to the Feton oxidation tank at the same time. The residence time of the wastewater in the Feton oxidation tank is 60 minutes, and the reaction equilibrium can be reached. Add NaOH solution until the pH of the wastewater is 7.8.

[0041](2) After the wastewater passes through the Feton oxidation pool, it enters the microfiltration membrane filter. The membrane filtration form selected in this process is a ceramic membrane filter with a membrane pore size of 0.1μm. The SS c...

Embodiment 2

[0047] For the high-salt and high-organic waste water of a chemical plant, the water quality indicators of various pollutants in the waste water are shown in Table 3:

[0048]

[0049] The waste water is treated as follows:

[0050] (1) First use a sulfuric acid solution with a volume fraction of 98% to adjust the pH of the wastewater to 2.8, and add H according to the COD concentration in the wastewater 2 o 2 Concentration of 325 mg / L, Fe 2+ The dosing concentration is 95 mg / L, and the two chemicals are added to the system reactor at the same time. The residence time of the wastewater in the Feton oxidation tank is 70 minutes, and the reaction equilibrium can be reached. Add NaOH solution until the pH of the wastewater is 7.8.

[0051] (2) After the wastewater passes through the Feton oxidation pool, it enters the microfiltration membrane filter. The membrane filtration form selected in this process is a ceramic membrane filter with a membrane pore size of 0.1 μm. The S...

Embodiment 3

[0057] For the high-salt and high-organic waste water of a chemical plant, the water quality indicators of various pollutants in the waste water are shown in Table 4:

[0058]

[0059] The waste water is treated as follows:

[0060] (1) First use a sulfuric acid solution with a volume fraction of 98% to adjust the pH of the wastewater to 3, and add H according to the COD concentration in the wastewater 2 o 2 Concentration of 580 mg / L, Fe 2+ The dosing concentration is 190mg / L, and the two chemicals are added to the system reactor at the same time. The residence time of the wastewater in the Feton oxidation tank is 80 minutes, and the reaction balance can be reached. NaOH solution was added until the pH of the wastewater was 8.

[0061] (2) After the wastewater passes through the Feton oxidation pool, it enters the microfiltration membrane filter. The membrane filtration form selected in this process is a ceramic membrane filter with a membrane pore size of 0.1 μm. The SS...

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Abstract

A treatment method of wastewater with high salinity and high organic matters comprises the following steps: 1) the wastewater goes into a Feton oxidation pond, the pH of the wastewater is adjusted to 2-3 by using an acid, and then H2O2 and Fe<2+> are added, a reaction is carried out for 60-80 min, and an alkali solution is added until the pH of the wastewater is 7-9; 2) the wastewater treated in the step 1) goes into a microfiltration membrane filter and is filtered; and 3) vacuum membrane distillation is carried out. The method is aimed at waste alkali liquid wet oxidized wastewater in an ethylene production and adopts the Feton oxidation pond and the microfiltration membrane filter, and the organic matter removal rate is above 90%, so the membrane pollution is reduced, the concentration multiple of the membrane distillation is increased, and continuous and stable operation of the membrane distillation can be achieved. Moreover, the wastewater treated by the membrane distillation system has no need of addition of an acid to adjust the pH, and thus the reagent cost is saved. The wastewater with high salinity and high organic matters is effectively reused, and the corrosion to equipment pipe fittings of a sewage treatment system is prevented.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for high-salt and high-organic-matter wastewater, which is suitable for the treatment method of waste lye wet oxidation wastewater in ethylene production. Background technique [0002] With the development of the economy and the reduction of water resources, the status of water in industrial production has become more and more important. The petrochemical industry is an industry with high energy consumption and high pollution. It discharges a large amount of industrial sewage every year. Ethylene production How to effectively treat waste lye wet oxidation wastewater is also a very difficult environmental protection problem. Due to the influence of its physical properties and components, there has been no effective treatment method. At present, it is mainly discharged to the sewage field for biochemical treatment together with other waste water produced in the et...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/72C02F1/44C02F1/08C02F101/30
Inventor 赵鹏张新妙杨永强
Owner CHINA PETROLEUM & CHEM CORP
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