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Pretreatment method of coking wastewater

A coking wastewater and pretreatment technology, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of failure to meet national discharge standards, carcinogenic and sudden organic pollutants, and effluent COD. Stability and other issues, to achieve the effect of improving COD removal rate, convenient biological treatment, and low cost

Inactive Publication Date: 2014-04-02
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since coking wastewater contains a large amount of refractory organic pollutants, especially the high content of volatile phenols, ordinary biological treatment methods are used directly to treat coking wastewater. After treatment, the COD of the effluent is unstable and contains organic pollutants that can cause cancer and burst often fail to meet national emission standards

Method used

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  • Pretreatment method of coking wastewater

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Experimental program
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Effect test

Embodiment 1

[0023] The natural ferromanganese tailings are crushed into powder, sieved, and the 200-300 mesh powder is dried for use. The manganese content in the ferromanganese tailings is about 18% and the iron content is about 16%.

[0024] Under laboratory conditions, the analytically pure phenol is dissolved in water to prepare an aqueous solution of phenol with a solubility of 50 mg / L to simulate coking wastewater.

[0025] Step 1: Take 100ml of simulated coking wastewater, add 0.1g of hydrogen peroxide, and mix to obtain reaction solution 1.

[0026] Step 2: Add 0.25 g of 200-300 mesh ferromanganese tailings powder to reaction solution 1, and shake for 1.5 hours under the shaking condition of 120r / min in a shaker to obtain reaction solution 2.

[0027] Step 3: Adjust the pH value of the second reaction solution to 6-9, add 0.5 mg of polyacrylamide (PAM) for coagulation, precipitation, take the supernatant, and detect the phenol content in the supernatant by spectrophotometry.

[0028] The te...

Embodiment 2

[0030] The natural ferromanganese tailings are crushed into powder, sieved, and the powder of 200-300 mesh is dried for use. The manganese content in the ferromanganese tailings is about 18%, and the iron content is about 16%.

[0031] figure 1 It is the flow chart in the second embodiment of the method for pretreatment of coking wastewater involved in the present invention.

[0032] Such as figure 1 As shown, under laboratory conditions, the raw water of coking wastewater from a coking plant in Jiangnan was selected for pretreatment.

[0033] Step 1: Take 100 mL of raw coking wastewater, add 0.16 g of hydrogen peroxide, and mix well to obtain reaction solution one (S1).

[0034] Step 2: Add 0.4g of 200-300 mesh ferromanganese tailings powder to reaction solution 1, and shake for 2h under the shaking condition of 150r / min to obtain reaction solution 2 (S2)

[0035] Step 3: Adjust the pH to 6-9, add 1 mg of polyacrylamide (PAM) for coagulation, precipitation, and take the supernatant ...

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Abstract

The invention provides a pretreatment method of coking wastewater. The method is characterized by comprising the following steps: S1, adding an oxidizing agent into coking wastewater, and uniformly stirring and mixing to obtain a reaction liquid I; S2, grinding tailing powder with oxidability to powder, adding the powder to the reaction liquid I, and vibrating or stirring for a certain time to obtain a reaction liquid II; and S3, adjusting the PH value of the reaction liquid II to 6-9, and adding a flocculant for flocculating and depositing to obtain pretreated coking wastewater. According to the pretreatment method of coking wastewater provided by the invention, as the coking wastewater is pretreated by combination of the oxidizing agent and the tailing powder with oxidability, the COD (Chemical Oxygen Demand) removal rate of the coking wastewater is greatly improved, the subsequent bio-treatment is convenient, and mineral resources are fully utilized by recycling waste of tailings, so that the use level of the oxidizing agent is reduced and the environmental pollution caused by the tailings is further solved.

Description

Technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for pretreatment of coking wastewater. Background technique [0002] Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds such as oxygen, sulfur, and nitrogen produced during the process of coking or coal gas retorting, purification and by-product recovery. It is a kind of high COD, high ammonia nitrogen and very high An industrial organic wastewater that is difficult to treat. There are three main sources: one is waste water produced during coal retort and gas cooling, which is the main source of coking wastewater; the other is waste water produced during the gas purification process, such as gas final cooling water and crude benzene separation water; Wastewater produced in the refining process of tar, crude benzene, etc. or other occasions. Due to the complex composition of coking wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F9/04C02F1/72C02F1/56
Inventor 刘洪波高赛赛马安平朱梦羚潘定陈漂
Owner UNIV OF SHANGHAI FOR SCI & TECH
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