Advanced treatment method of ethylene waste lye

A technology for advanced treatment of ethylene waste lye, applied in chemical instruments and methods, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve high organic pollutant content, low wastewater treatment efficiency, external drainage Exceeding the standard and other problems, to achieve the effect of shortening the response time, shortening the processing process, and reducing the amount of use

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Problems solved by technology

[0007] However, there are the following problems in the process of mixing the waste ethylene lye after wet oxidation with other waste water: (1) the salt content in the ethylene waste lye is very high, and the treated effluent cannot be reused
(2) Due to the high content of organic pollutants in ethylene waste lye and poor biodegradability, it often impacts downstream sewage treatment plants, affects the discharge of sewage up to standard, and causes external drainage to exceed the standard
(3) The chromaticity of ethylene waste lye has a great influence on the apparent color of the effluent
[0010] In the above method, the micro-electrolysis process is easily affected by environmental changes, especially for ethylene waste lye with high salt content, high organic content, and large composition changes, which will even affect the efficiency of wastewater treatment. reduce
Since the biochemical process cannot deal with certain macromolecular organic substances, the treatment process of only biochemical treatment without chemical oxidation is also difficult to apply to the complex composition of ethylene waste lye

Method used

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  • Advanced treatment method of ethylene waste lye
  • Advanced treatment method of ethylene waste lye
  • Advanced treatment method of ethylene waste lye

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Experimental program
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Effect test

Embodiment 1

[0037] The waste ethylene lye (see Table 2 for its composition) after the wet oxidation treatment is discharged into the pH value adjustment pool, and concentrated sulfuric acid is added to adjust it into wastewater with a pH value of 8.5. Then the waste water is discharged into the first-level aerobic biochemical reaction tank, and potassium dihydrogen phosphate is added in an amount of 100:2 based on the mass ratio of waste water influent COD and phosphorus element, and at a sludge concentration of 5-6g / L, the dissolved oxygen concentration is 4-5mg / L, the temperature is 20-30°C, and the pH value is 8.5 for 24 hours. After that, discharge the wastewater into the first secondary sedimentation tank for precipitation, and discharge the supernatant into the Fenton oxidation unit. First, add concentrated sulfuric acid to the discharged wastewater to adjust the pH value to 3.0, and then add ferrous sulfate in turn (FeSO 4 ·7H 2 O) and hydrogen peroxide (H 2 o 2 ), where Fe 2...

Embodiment 2

[0044] The waste ethylene lye (see Table 4 for its composition) after the wet oxidation treatment is discharged into the pH value adjustment pool, and concentrated sulfuric acid is added to adjust it into wastewater with a pH value of 9.5. Then the waste water is discharged into the first-level aerobic biochemical reaction tank, and sodium dihydrogen phosphate is added in an amount of 100:3 based on the mass ratio of waste water influent COD and phosphorus element, and at a sludge concentration of 6-8g / L, dissolved oxygen concentration 4-6mg / L, temperature 20-30°C, pH 9.5 for 48 hours. After that, discharge the wastewater into the first secondary sedimentation tank for precipitation, and discharge the supernatant into the Fenton oxidation unit. First, add concentrated sulfuric acid to the discharged wastewater to adjust the pH value to 3.5, and then add ferrous sulfate in turn. (FeSO 4 ·7H 2 O) and hydrogen peroxide (H 2 o 2 ), where Fe 2+ / H 2 o 2 The mass concentrati...

Embodiment 3

[0051] The waste ethylene lye (see Table 6 for its composition) after the wet oxidation treatment is discharged into the pH value adjustment tank, and concentrated sulfuric acid is added to adjust it into wastewater with a pH value of 9.0. Then the waste water is discharged into the first-level aerobic biochemical reaction tank, and potassium dihydrogen phosphate is added in an amount of 100:5 based on the mass ratio of waste water influent COD and phosphorus element, and when the sludge concentration is 5-6g / L, the dissolved oxygen concentration is 4-5mg / L, the temperature is 20-30°C, and the pH value is 9.0 for 36 hours. After that, discharge the wastewater into the first secondary sedimentation tank for precipitation, and discharge the supernatant into the Fenton oxidation unit. First, add concentrated sulfuric acid to the discharged wastewater to adjust the pH value to 3.5, and then add ferrous sulfate in turn. (FeSO 4 ·7H 2 O) and hydrogen peroxide (H 2 o 2 ), where ...

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Abstract

The invention relates to an advanced treatment method of an ethylene waste lye, and belongs to the sewage treatment field. The method comprises the following steps: 1, adjusting the pH value of a wet-oxidized ethylene waste lye to a predetermined value; 2, carrying out primary aerobic biochemical treatment of the wastewater obtained in step 1 in a primary aerobic biochemical treatment pool; 3, carrying out Fenton oxidation treatment of the wastewater obtained in step 2; 4, adjusting the pH value of the wastewater obtained in step 3 to a predetermined value; and 5, carrying out secondary aerobic biochemical treatment of the wastewater obtained in step 4 in a secondary aerobic biochemical treatment pool, precipitating, and discharging the obtained supernatant. The method has the advantages of good ethylene waste lye treatment effect, short treatment flow, simple operation and stable running.

Description

technical field [0001] The invention relates to a method for treating organic waste water, in particular to a method for advanced treatment of ethylene waste lye. Background technique [0002] Ethylene waste lye is the waste liquid formed after the acid gas produced in the ethylene production process is treated by alkali washing. Its characteristics are: strong alkalinity, high concentration of organic matter such as sulfide and butter, poisonous, foul smell and deep color. It is a typical high-concentration refractory organic wastewater. [0003] The composition of ethylene spent lye depends on the type of raw material used to produce ethylene, the depth of cracking, the sulfur content of the raw material and the amount of alkali used in the operation of the absorption tower. The composition of typical ethylene spent lye is shown in Table 1, where NaRS is the 2 Other sulfur-containing compounds other than S. [0004] Table 1 [0005] [0006] For the treatment of ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/72C02F103/18
Inventor 赵桂瑜魏令勇孙杰赵璞王道泉马兰兰
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