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Coagulant treating coking wastewater and use technology thereof

A technology of coking wastewater and coagulant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of effluent not meeting the discharge standard, low removal rate, and difficult treatment of residues, and achieve the settlement speed and completeness, increasing investment , the effect of shortening the settling time

Active Publication Date: 2011-04-20
HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the adsorption method, activated carbon, fly ash, etc. are often used as adsorbents, but there are problems such as high cost or difficult disposal of residues, and currently domestic manufacturers rarely use them.
The key to the coagulation method is the coagulant used. In the treatment of coking wastewater, polyferric sulfate or polyaluminum chloride is generally used as the coagulant. Although it is easy to operate and use, it is harmful to COD cr , chroma, total CN - The removal rate of the main pollution indicators such as the effluent is not high, resulting in the effluent far from reaching the national or local allowable discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the preparation of coagulant

[0023] The raw materials are mixed according to the following mass proportions: 50% of ferrous sulfate, 30% of aluminum sulfate, 10% of ferric chloride, 5% of polysilicate, and 5% of zeolite are mixed according to the mass proportion, and the total mass is 30 grams. Grinding to 50-100 mesh, heating it at 70-90°C, stirring at a speed of 300r / min for 2h, and then adding 6 ml of NaOH solution with a mass concentration of 20% to the above-mentioned treated raw materials dropwise, dropwise for 2h After drying, screening and packaging, the finished coagulant for coking wastewater treatment is obtained.

Embodiment 2

[0024] Embodiment 2: the preparation of coagulant

[0025] The raw materials are mixed according to the following mass ratio: 45% of ferrous sulfate, 40% of aluminum sulfate, 5% of ferric chloride, 5% of polysilicate, and 5% of zeolite are mixed according to the mass ratio, and the total mass is 30 kg. Grinding to 50-100 mesh, heating it at 70-90°C, stirring at a speed of 300r / min for 2h, and then adding 6 liters of NaOH solution with a mass concentration of 20% to the above-mentioned treated raw materials for 1.5h After dripping, the finished coagulant for coking wastewater treatment can be obtained after drying, sieving and packaging.

[0026] In an application example of the present invention, a coagulation experiment was performed on coking wastewater from a coking plant. After the coking wastewater of the plant has been treated in the stages of adjustment, neutralization, air flotation and degreasing, and A / O biochemical treatment in the pre-stage, the main indicator of ...

Embodiment 3

[0027] Embodiment 3: the application of coagulant

[0028] (1) Take the coking wastewater treated in the previous stage of the plant, and the effluent quality is: COD cr 200mg / L, chromaticity 240 times, total CN -1.2mg / L, F - 25mg / L;

[0029] (2) Regulate the pH value of coking wastewater with milk of lime, make it between 6~9, start the hexapod agitator agitator, drop into the coagulant for coking wastewater treatment that embodiment 1 makes then, dosage is 900mg / L, stir at 300r / min for 30s, then stir at 80r / min for 10min, let stand for 30min, take the supernatant, measure COD cr , total CN - , F - and chroma.

[0030] The detection method is to adopt "Sewage Comprehensive Discharge Standard (GB8978-1996)"; COD is measured by potassium dichromate method; chromaticity is measured by platinum-cobalt colorimetry; F - The determination adopts the ion selective electrode method, CN - The determination was determined by distillation colorimetry.

[0031] (3) The measured w...

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Abstract

The invention discloses a coagulating agent for coking wastewater treatment and a process for applying the same. The coagulating agent for coking wastewater treatment is compounded by using ferrous sulfate, aluminium sulfate, ferric chloride, polysilicate and zeolite powder as raw materials; and the coagulating agent comprises the following raw materials in percentage by mass: 30 to 70 percent ofthe ferrous sulfate, 20 to 60 percent of the aluminium sulfate, 3 to 10 percent of the ferric chloride, 1 to 5 percent of the polysilicate and 1 to 5 percent of the zeolite powder. The application process comprises that: in a coagulating treatment stage after coking wastewater is subjected to A / O biological treatment, the PH value of the coking wastewater subjected to A / O biological treatment is regulated to be between 6 and 9; and the coagulating agent for coking wastewater treatment is added into the coking wastewater for coagulation treatment so that the final concentration of the coagulating agent for coking wastewater treatment in the coking wastewater is between 900 and 1,500 mg / L. Compared with the other coagulating agents, the coagulating agent has high efficiency, economization and excellent coagulating effect; and the application process is simple and has low investment cost.

Description

(1) Technical field [0001] The invention relates to a coagulant for coking wastewater treatment and an application process thereof. (two) background technology: [0002] Coking wastewater is wastewater produced during the process of coal coking, gas purification, chemical product refining and coking product recovery, containing dozens of polycyclic and heterocyclic biodegradable organic compounds such as phenol, biphenyl, pyridine, indole and quinoline and inorganic fluoride ions, ammonia nitrogen ions, cyanide ions and other toxic and harmful pollutants. The composition is complex, the pollutants have high concentration, high chroma, and high toxicity. They exist in the form of true solutions or quasi-colloids in water, and their properties are very stable. A typical refractory organic wastewater. The treatment of coking wastewater is generally carried out in two steps in China at present. First, use A / O or A 2 / O biochemical denitrification and removal of most COD cr , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 刘维屏张安平童少平朱显跃卢建杭
Owner HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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