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Processing method of wastewater in coal chemistry industry

A technology for coal chemical wastewater and treatment method, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The problem of poor biodegradability, etc., can achieve the effect of good wastewater purification effect, strong controllability of effluent quality, and easy control of operating process conditions.

Active Publication Date: 2014-11-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The secondary biochemical oxidation treatment of coal chemical wastewater has poor biodegradability, COD value is higher than 100mg / L, and cannot meet the wastewater discharge requirements stipulated in the "Comprehensive Wastewater Discharge Standard" (GB8978-1996)
At present, there is no mature advanced treatment process to make coal chemical wastewater discharge up to the standard

Method used

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  • Processing method of wastewater in coal chemistry industry
  • Processing method of wastewater in coal chemistry industry
  • Processing method of wastewater in coal chemistry industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1. Acidification treatment

[0077] The secondary biochemical oxidation effluent treated by the coal chemical wastewater treatment station is passed into the water quality adjustment tank, industrial sulfuric acid is added to the wastewater, and the wastewater is stirred with compressed air, mixed evenly, and the pH value of the wastewater is adjusted to 5.0. The water quality adjustment tank The hydraulic retention time is 30min.

[0078] In addition to sulfuric acid, the acidic solution added to the waste water in the acidification treatment stage of the present invention can also be selected from hydrochloric acid, nitric acid or steel pickling waste liquid, wherein, the steel pickling waste liquid is produced in the hot rolling process of steel Acidic waste liquid produced, in which H + The concentration of Fe is 0.05~5g / L, Fe 2+ The concentration is 60~250g / L. Selecting the iron and steel pickling waste liquid can introduce the initiator Fe into the waste water ...

Embodiment 2

[0095] 1. Acidification treatment

[0096] Pass the secondary biochemical oxidation effluent treated by the coal chemical wastewater treatment station into the water quality adjustment tank, add hydrochloric acid to the wastewater, use a mixer to stir the wastewater, mix it evenly, adjust the pH value of the wastewater to 4.5, and control the wastewater in the water quality adjustment The hydraulic retention time in the pool is 20min.

[0097] 2. Chemical oxidation treatment

[0098] 2-1) Use a pump to send the effluent from the regulating tank to the flat-flow partition oxidation tank through two pipeline mixers in series, add the oxidant potassium persulfate solution with a metering pump before the first mixer, and add the oxidant potassium persulfate solution to the second mixer Add the initiator ferrous chloride solution with a metering pump before, so that the mass concentration of potassium persulfate in the wastewater is 343mg / L (molar concentration is 1.27mmol / L), and...

Embodiment 3

[0106] 1. Acidification treatment

[0107] Pass the secondary biochemical oxidation effluent treated by the coal chemical wastewater treatment station into the water quality adjustment tank, add nitric acid to the wastewater, stir the wastewater with compressed air or a mixer, and mix it evenly, adjust the pH value of the wastewater to 4.75, and control the wastewater The hydraulic retention time in the water quality regulating tank is 25min.

[0108] 2. Chemical oxidation treatment

[0109] 2-1) Use a pump to send the effluent from the regulating tank to the backflow partition oxidation tank through two pipeline mixers connected in series, and add the oxidant potassium monopersulfate solution in front of the first mixer with a metering pump. Add the initiator sodium sulfite solution with a metering pump before the mixer, so that the mass concentration of potassium monopersulfate in the wastewater is 375mg / L (molar concentration is 2.46mmol / L), and the mass concentration of p...

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Abstract

The invention relates to a deep processing method of wastewater in the coal chemistry industry. The method comprises the following steps in sequence: subjecting the effluent, which has been processed by a secondary biochemical treatment for wastewater in coal chemistry industry, to a chemical oxidation treatment and a biological oxidation treatment in sequence. The processing method adopts a technology integrating the chemical oxidation and biochemical oxidation, thus overcomes the shortage of high operation cost of the chemical oxidation technology and the shortage of low COD elimination rate of the biochemical oxidation technology, and achieves the degradation of partial organic pollutants in wastewater. The processed wastewater reaches the discharge or recycle standard, and the pollution to the environment is reduced. The processing method has the advantages of high processing efficiency, low operation cost, and strong adaptability for wastewater in coal chemistry industry, the processed wastewater reaches the national environmental requirements, and thus the processing method can achieve good economic and social profits.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment process for waste water mainly used in coal chemical industry. Background technique [0002] For the treatment of coal chemical wastewater, the treatment system basically follows the process route of "first-level physical and chemical pretreatment - second-level biochemical treatment - third-level advanced treatment". [0003] (1) Primary physical and chemical pretreatment [0004] Coal chemical wastewater contains a certain amount of oil. Oil separation and air flotation methods are often used to remove and recycle the oil in coal chemical wastewater to reduce the adverse effects of oil on the subsequent biochemical treatment process. New pretreatment methods for coal chemical wastewater, such as ozone oxidation, Fenton oxidation, coke adsorption, ion membrane-assisted electrocatalytic oxidation, manganese ore oxidation-magnesium ammonium phosphate p...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 高迎新李良杰杨敏焦思明
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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