Method for advanced treatment of coking wastewater

A coking wastewater and advanced treatment technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that the effluent is difficult to meet the discharge standard, the treatment process is complicated, and the filler is easy to harden, etc. problem, to achieve the effect of facilitating oxidation-reduction reaction, simple process flow, and avoiding iron-carbon agglomeration

Inactive Publication Date: 2015-09-09
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the technical problems in the prior art mentioned in the above-mentioned background technology, such as complex treatment process, poor effect, easy hardening of fillers, and difficulty in reaching discharge standards for effluent, and proposes a simple process flow, process The required equipment is simple, the operation is convenient, the effect is good, the effect is quick, the medicines and reagents used are cheap and easy to obtain, the cost of device operation is low, and the method for advanced treatment of coking wastewater with high practicability

Method used

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Effect test

Embodiment 1

[0045] The method for advanced treatment of coking wastewater according to Embodiment 1 of the present invention specifically comprises the following steps:

[0046] S110, take some scrap iron filings, soak the iron filings with dilute sulfuric acid to remove oxides on its surface, then soak them in dilute NaOH solution, remove the oil stains on the surface, and then fully wash the iron filings with clean water; pulverize the coke into particle size Close to the particle size of iron filings, take the processed iron filings, then mix them evenly according to the ratio of iron filings and coke at 12:1 (volume ratio), and pack them into columns;

[0047] S120. Discharge the coking wastewater after secondary biochemical treatment into the flocculation tank, and add flocculant FeCl at a rate of 3g / L 3 , static precipitation;

[0048] S130, discharge the supernatant after the flocculation treatment in the above step S120 into the acidification treatment tank, add concentrated H 2...

Embodiment 2

[0055] The method for advanced treatment of coking wastewater according to Embodiment 2 of the present invention specifically comprises the following steps:

[0056] S210. Take some scrap iron filings, soak the iron filings with dilute sulfuric acid to remove oxides on its surface, then soak them in dilute NaOH solution to remove oil stains on the surface, and then fully wash the iron filings with clean water; crush the coke into particle size Close to the particle size of iron filings, take the processed iron filings, then mix them evenly according to the ratio of iron filings and coke at 12:1 (volume ratio), and pack them into columns;

[0057] S220. Discharge the coking wastewater after secondary biochemical treatment into the flocculation tank, and add flocculant FeCl at 2g / L 3 , static precipitation;

[0058] S230, discharge the supernatant after the flocculation treatment in the above step S220 into the acidification treatment tank, add concentrated H 2 SO 4 Adjust th...

Embodiment 3

[0064] S310. Take some scrap iron scraps, soak the iron scraps with dilute sulfuric acid to remove oxides on their surfaces, then soak them in dilute NaOH solution to remove oil stains on their surfaces, and then fully wash the iron scraps with clean water. Crush the coke into a particle size close to that of iron filings, take the processed iron filings, and then mix them evenly according to the ratio of iron filings and coke to 12:1 (volume ratio), and pack them into columns;

[0065] S320. Discharge the coking wastewater after secondary biochemical treatment into the flocculation tank, and add flocculant FeCl at 2g / L 3 , static precipitation;

[0066] S330, discharge the supernatant after the flocculation treatment in the above step S320 into the acidification treatment tank, add concentrated H 2 SO 4 Adjust the pH of the solution to about 3, and let it stand for precipitation;

[0067]S340. Discharge the supernatant after the acidification treatment in the above step S3...

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Abstract

The invention relates to a method for advanced treatment of coking wastewater. The method comprises the following steps: (1) performing column packing: soaking iron scraps in dilute sulphuric acid and a dilute NaOH solution respectively, smashing coke, uniformly mixing the iron scraps and coke according to the volume ratio of 12:1, and filling an iron carbon column with the mixture; (2) adding a flocculant in the coking wastewater subjected to the column packing treatment for flocculation and sedimentation treatment; (3) performing acidification on the wastewater; (4) performing column-passing treatment on the acidated wastewater to enable the wastewater to enter from the bottom of the iron carbon column and flow out from the upper part of the iron carbon column; (5) performing neutralizing treatment and sedimentation; (6) repeatedly performing the steps (2) to (5) on supernatant obtained in the step (5); (7)performing sand filtration treatment. According to the invention, the process is simple, required equipment during implementation is simple, the operation is convenient, the effect is excellent and rapid, the required chemicals and reagents are cheap and available, and the device is low in operating cost and higher in practicality.

Description

Technical field: [0001] The invention relates to an application in the field of sewage environmental protection treatment, in particular to a method for advanced treatment of coking wastewater. Background technique [0002] Coking wastewater is wastewater generated during the process of coal coke, gas purification and coking product recovery. The wastewater is characterized by high concentrations of COD and ammonia nitrogen, and contains a large amount of inorganic salts such as ammonium salts, sulfides, and cyanides, and the organic components are complex, mainly including phenolic compounds, polycyclic aromatic compounds, heterocyclic compounds, and fatty compounds. compounds, and the concentration of pollutants is high, which belongs to biodegradable organic wastewater. Coking wastewater generally needs to be discharged through primary pretreatment, secondary biochemical treatment and advanced treatment. At present, after the secondary biochemical treatment of coking wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 林立君苑庆山郑立辉李磊龙小菊
Owner NORTHEAST GASOLINEEUM UNIV
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