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Biological treatment process and device for high-sulfur-containing and phenol-containing waste alkali liquid

A technology of biological treatment and waste lye, applied in the field of environmental engineering, can solve problems such as difficulty in meeting energy conservation and emission reduction policies, increase reactor load, increase operating costs, etc., achieve capacity improvement, reduce water consumption, and save floor space Effect

Active Publication Date: 2012-10-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pretreatment step not only greatly increases the load of the reactor (the amount of waste liquid increases several times), but also consumes a large amount of acid, which greatly increases the operating cost, and to a certain extent, it is difficult to meet the national energy saving and emission reduction policy

Method used

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  • Biological treatment process and device for high-sulfur-containing and phenol-containing waste alkali liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] HS in waste lye - Concentration is 5.0g / L, COD concentration is 15 g / L, Na + The concentration is 0.4 mol / L.

[0035] Process conditions: the reaction temperature is 35°C; the pH is 9.5; the hydraulic retention time is 96 hours.

[0036] Under above-mentioned processing condition, described waste lye is processed:

[0037] (1) Pretreatment: Add EDTA 300mg / L, FeSO4·7H to the waste lye2 O 100mg / L, ZnSO 4 ·7H 2 O 10mg / L, MnCl 2 4H 2 O 3mg / L, H 3 BO 3 20mg / L, CoCl 2 ·6H 2 O 10mg / L, CuCl 2 2H 2 O 1mg / L, NiCl 2 ·6H 2 O2mg / L, Na 2 MoO 4 2H 2 0. 3mg / L and 25μg vitamin B12, in order to supplement the nutrient elements necessary for the growth and metabolism of saline-alkali-resistant microorganisms in the reactor, a small amount of waste lye is respectively 10 times, 8 times, 5 times, 3 times, 1 times (not Dilution) is diluted for the start-up of the reactor;

[0038] (2) Reactor startup: under aerobic conditions, set the pH at 9.0, Na + The river bed sedimen...

Embodiment 2

[0043] HS in waste lye - Concentration is 6.0g / L, COD concentration is 22 g / L, Na + The concentration is 0.6 mol / L.

[0044] Process conditions: the reaction temperature is 30°C; the pH is 9.2; the hydraulic retention time is 60 hours.

[0045] Under above-mentioned processing condition, described waste lye is processed:

[0046] (1) Pretreatment: Add EDTA 300mg / L, FeSO 4 ·7H 2 O 100mg / L, ZnSO 4 ·7H 2 O 10mg / L, MnCl 2 4H 2 O 3mg / L, H 3 BO 3 20mg / L, CoCl 2 ·6H 2 O 10mg / L, CuCl 2 2H 2 O 1mg / L, NiCl 2 ·6H 2 O2mg / L, Na 2 MoO 4 2H 2 O 3mg / L and 25μg vitamin B12, in order to supplement the nutrient elements necessary for the growth and metabolism of saline-alkali-resistant microorganisms in the reactor, at the same time, a small amount of waste lye was respectively 8 times, 5 times, 3 times, 1 times (undiluted) Dilution, for start-up of the reactor;

[0047] (2) Reactor startup: under aerobic conditions, set the pH at 9.5, Na + The salt lake bottom sludge with ...

Embodiment 3

[0052] HS in waste lye - Concentration is 7.0g / L, COD concentration is 25 g / L, Na + The concentration is 0.8 mol / L.

[0053] Process conditions: the reaction temperature is 20°C; the pH is 9.0; the hydraulic retention time is 24 hours.

[0054] Under above-mentioned processing condition, described waste lye is processed:

[0055] (1) Pretreatment: Add EDTA 300mg / L, FeSO 4 ·7H 2 O 100mg / L, ZnSO 4 ·7H 2 O 10mg / L, MnCl 2 4H 2 O 3mg / L, H 3 BO 3 20mg / L, CoCl 2 ·6H 2 O 10mg / L, CuCl 2 2H 2 O 1mg / L, NiCl 2 ·6H 2 O2mg / L, Na 2 MoO 4 2H 2 0. 3mg / L and 25μg vitamin B12, in order to supplement the nutrient elements necessary for the growth and metabolism of saline-alkali-resistant microorganisms in the reactor, a small amount of waste lye is respectively 10 times, 8 times, 5 times, 3 times, 1 times (not Dilution) is diluted for the start-up of the reactor;

[0056] (2) Reactor startup: under aerobic conditions, set the pH at 10.0, Na + The soda lake bottom sludge with...

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Abstract

The invention discloses a biological treatment process for high-sulfur-containing and phenol-containing waste alkali liquid. The process comprises the following steps of: diluting high-sulfur-containing and phenol-containing waste alkali liquid until the concentration of sulfide is not more than 7.0g / L, the concentration of the COD (chemical oxygen demand) is not more than 25g / L and the concentration of Na+ is not more than 0.8mol / L; regulating a pH value of the liquid to be not more than 9.5; and performing treatment process of three steps, namely sludge inoculation, starting of a reactor and treatment of waste alkali liquid, under the conditions that the reaction temperature is 20-35 DEG C, the dissolved oxygen is 3-7mg / L and the hydraulic retention time is 24-96 hours. The invention also discloses a biological treatment device for high-sulfur-containing and phenol-containing waste alkali liquid. The biological treatment process and the biological treatment device have the beneficial effects that the removal ratio of pollutants is high, the removal ratio of sulfide is over 95 percent, and the removal ratio of organic matters is up to 90 percent; the capability of treating the waste alkali liquid is greatly improved, and the waste alkali liquid of which the pH value is about 9.5 can be treated; the cost and pretreatment expenses are reduced; and the secondary pollution is not caused, and the reaction device is small in floor area and is easy to operate.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a desulfurization and dephenolization treatment process and device for high-concentration sulfur-containing and phenol-containing waste lye produced in the production process of the petrochemical industry. Background technique [0002] In the petrochemical production process, what is produced is refractory high-sulfur and phenol-containing waste lye. The emission of organic oxides (COD), sulfides and phenols in this waste lye is as high as 40-50% of the total discharge of pollutants from the refinery; meanwhile, this waste lye also has strong alkalinity (pH ≥ 12 ), high salinity (Na + The content is as high as 5-12%). [0003] At present, the treatment methods for high-sulfur and phenol-containing waste lye mainly include direct treatment, neutralization and wet air oxidation and other physical and chemical methods and biological methods. The direct treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F1/58
Inventor 刘春爽赵东风赵朝成邓旭亮顾贵洲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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