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Pretreatment method of coking wastewater

A coking wastewater and pretreatment technology, applied in the field of water treatment, can solve the problems of difficult discharge of pollutants, high investment and operating costs of the tertiary treatment process, failure to meet environmental protection requirements, etc., and achieve the effect of high-efficiency oxidation

Active Publication Date: 2013-09-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pollutants such as COD and ammonia nitrogen in the wastewater after secondary treatment are difficult to discharge up to the standard and cannot meet the increasing environmental protection requirements. Therefore, the method of adding a third-level treatment is generally used at present, but the investment and operating costs of the third-level treatment process are relatively high.

Method used

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  • Pretreatment method of coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Slowly add concentrated sulfuric acid to the coking waste water in the adjustment tank while stirring, so that the pH of the waste water is 2.7; then pump it into the upper part of the cylindrical inner electrolysis reactor. The filler of the reactor is composed of cast iron filings and shell activated carbon, and the mass ratio of the two is 8:1. The residence time of the wastewater in the column is 2h, and the effluent flows into the Fenton oxidation pond.

[0017] The Fenton oxidation process adopts intermittent operation. After the wastewater in the pool reaches 3 / 4, it starts to stir and add concentrated sulfuric acid at the same time to make the pH to 3. Add ferrous sulfate solid at one time to make the concentration of ferrous ions reach 700ppm, and then slowly add hydrogen peroxide solution to make the concentration reach 1500ppm. After reacting for 2 hours under stirring, the waste water flows into the coagulation sedimentation tank.

[0018] Add 3ppm coagula...

Embodiment 2

[0020] Slowly add concentrated sulfuric acid to the coking wastewater in the adjustment pool while stirring, so that the pH of the wastewater is 3;

[0021] Then it is pumped into the upper part of the cylindrical inner electrolytic reactor. The filler of the reactor is composed of cast iron filings and shell activated carbon, and the mass ratio of the two is 8:1. The residence time of the wastewater in the column is 2.3h, and the effluent flows into the Fenton oxidation pond.

[0022] The Fenton oxidation process adopts intermittent operation. After the wastewater in the pool reaches 4 / 5, it starts stirring and adds concentrated sulfuric acid at the same time to make its pH 3.3. Add ferrous sulfate solid at one time to make the concentration of ferrous ions reach 800ppm, and then slowly add hydrogen peroxide solution to make the concentration reach 1700ppm. After reacting for 2.5 hours under stirring, the waste water flows into the coagulation sedimentation tank.

[0023] ...

Embodiment 3

[0025] Slowly add concentrated sulfuric acid to the coking wastewater in the adjustment pool while stirring, so that the pH of the wastewater is 3.3;

[0026] Then it is pumped into the upper part of the cylindrical inner electrolytic reactor. The filler of the reactor is composed of cast iron filings and shell activated carbon, and the mass ratio of the two is 8:1. The residence time of the wastewater in the column is 2.5h, and the effluent flows into the Fenton oxidation pond.

[0027] The Fenton oxidation process adopts intermittent operation. After the wastewater in the pool reaches 5 / 6, it starts stirring and adds concentrated sulfuric acid at the same time to make its pH 3.5. Add ferrous sulfate solid at one time to make the concentration of ferrous ions reach 900ppm, and then slowly add hydrogen peroxide solution to make the concentration reach 1900ppm. After reacting for 3 hours under stirring, the waste water flows into the coagulation sedimentation tank.

[0028] ...

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Abstract

The invention discloses a pretreatment method of coking wastewater. The method which comprises procedures of pH adjustment, internal electrolysis, Fenton oxidation and coagulating precipitation concretely comprises the following steps: 1, adding an acid to an adjustment pool provided with wastewater to form an acidic solution to allow the pH of the wastewater to be between 2.7 and 3.3; 2, injecting the wastewater into the upper part of an internal electrolysis reactor by a pump, and carrying out the internal electrolysis; 3, allowing effluent water of the internal electrolysis reactor to flowinto an Fenton oxidation reactor, adding the acid with continuously stirring to the pH of the effluent water of 3-3.5, adding solid ferrous sulphate to the concentration of ferrous ions of 700-900ppm, adding a hydrogen peroxide solution to make the concentration of hydrogen peroxide reach 1500-1900ppm; and 4, allowing wastewater to flow into a coagulation-precipitation tank after finishing the Fenton oxidation, adding a coagulant aid with stirring, standing to precipitate and treating a supernatant obtained after precipitation as pretreated coking wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a pretreatment method for coking wastewater. Background technique [0002] Coke is an indispensable fuel for the iron and steel industry. With the rapid development of the iron and steel industry, the demand for coke is also increasing day by day. However, the coking industry is both a major water user and a major polluter. Coking wastewater is recognized as one of the most difficult industrial wastewater due to its wide range of sources, complex components, changeable characteristics, and huge hazards. It is difficult to meet the discharge standards and the reuse rate is generally low. [0003] The treatment of coking wastewater in my country began in the 1950s, and has experienced a process of starting from scratch, gradually improving, and constantly improving. In the low-level stage in the 1950s, only a few large coking plants carried out simple mechanical treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/66C02F1/72C02F1/52
Inventor 胡绍伟徐小连徐承明王永艾芳芳钟彬王永明
Owner ANGANG STEEL CO LTD
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