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A low-cost method for treating coking wastewater

A low-cost technology for coking wastewater, applied in chemical instruments and methods, mining wastewater treatment, water/sewage multi-stage treatment, etc. Treatment costs, saving process operating costs, and meeting the effect of up-to-standard emissions

Active Publication Date: 2020-09-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the volatile phenol, ammonia nitrogen, and color of the effluent can meet the first-level standard of the comprehensive sewage discharge standard, the COD treatment effect is not ideal, and can only meet the second-level standard of the comprehensive sewage discharge standard
[0005] To sum up, due to the complex and changeable composition of coking wastewater, which contains a variety of long-chain and cyclic organic substances that are difficult to degrade, the biodegradability of wastewater is poor, and it is difficult to achieve the desired effect by only one treatment method. Combined with biochemical technology to treat coking wastewater, but there are unsatisfactory treatment effects, complex process flow and high operating costs in the treatment, and the respective advantages have not been brought into play, making it difficult for the treated water to meet the current discharge standards.

Method used

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  • A low-cost method for treating coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The coking wastewater in the adjustment tank is pumped into the Fenton oxidation reaction tank. The reaction tank adopts intermittent operation, and pickling waste liquid is added while stirring to control the pH of the wastewater in the Fenton oxidation tank to 2.0; then add hydrogen peroxide solution to make the concentration To reach 1300ppm, the oxidation reaction time is controlled to be 1.5h under stirring; the effluent of the Fenton oxidation reaction tank flows into the neutralization tank, and desulfurization ash is added to the neutralization tank while stirring, and the pH of the wastewater is controlled to be 7.0; the neutralization tank’s The effluent flows into the flocculation sedimentation tank. Add 15% NaOH lye and 4ppm flocculant PAM to the flocculation sedimentation tank while stirring, control the pH of the wastewater to 9.0, and aerate the wastewater while stirring. After stirring for 15 minutes Stop stirring and aerating the wastewater, and let it s...

Embodiment 2

[0022]The coking wastewater in the adjustment tank is pumped into the Fenton oxidation reaction tank. The reaction tank adopts intermittent operation, and pickling waste liquid is added while stirring to control the pH of the wastewater in the Fenton oxidation tank to 2.5; then add hydrogen peroxide solution to make the concentration To reach 1400ppm, the oxidation reaction time is controlled to be 2.0h under stirring; the effluent of the Fenton oxidation reaction tank flows into the neutralization tank, and desulfurization ash is added to the neutralization tank while stirring, and the pH of the wastewater is controlled to be 7.5; The effluent flows into the flocculation sedimentation tank. Add 20% NaOH lye and 6ppm flocculant PAM to the flocculation sedimentation tank while stirring, control the pH of the wastewater to 9.5, and aerate the wastewater while stirring. After stirring for 18 minutes Stop stirring and aerating the wastewater, and let it settle for 35 minutes. The ...

Embodiment 3

[0026] The coking wastewater in the adjustment tank is pumped into the Fenton oxidation reaction tank. The reaction tank adopts intermittent operation, and pickling waste liquid is added while stirring to control the pH of the wastewater in the Fenton oxidation tank to 3.0; then add hydrogen peroxide solution to make the concentration To reach 1500ppm, the oxidation reaction time is controlled to be 2.5h under stirring; the effluent of the Fenton oxidation reaction tank flows into the neutralization tank, and desulfurization ash is added to the neutralization tank while stirring, and the pH of the wastewater is controlled to be 8.0; the neutralization tank’s The effluent flows into the flocculation sedimentation tank. Add 25% NaOH lye and 8ppm flocculant PAM to the flocculation sedimentation tank while stirring, control the pH of the wastewater to 10.0, and aerate the wastewater while stirring. After the stirring time reaches 20min Stop stirring and aerating the wastewater, and...

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Abstract

The invention discloses a method for treating coking wastewater by adopting a Fenton oxidation tank, a neutralization tank and a flocculation and sedimentation tank for pretreatment, adopting an anoxic tank and an aerobic tank for biochemical treatment and adopting modified coke powder adsorption for deep treatment. At a pretreatment stage, a metallurgical acid pickling waste liquid is added intoa Fenton oxidation reaction tank, so that waste acid resources and Fe<2+> in the acid pickling waste liquid are sufficiently utilized, and the acid pickling waste liquid from steel mills is recycled to the maximum extent; desulfurized ash is added into the neutralization tank, and part of additionally added alkaline liquid is replaced by sufficiently utilizing the alkalinity of the desulfurized ash, so that the operation cost of a process is reduced; and dry quenching coke powder for deep treatment is a byproduct produced in a coking process, and when the dry quenching coke powder is applied to the field of wastewater treatment, not only is the wastewater treatment cost reduced, the quality of the final effluent improved, but also the aim of treating wastes by utilizing wastes is achieved.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a low-cost method for treating coking wastewater. Background technique [0002] Coking wastewater is wastewater formed during the high-temperature carbonization of coal, gas purification, and refining of chemical products. It has complex components, high pollutant concentration, high chroma, high toxicity, very stable properties, and poor biodegradability. In addition to inorganic pollutants such as thiocyanate, it also contains heterocyclic and polycyclic aromatic compounds (PAHs) such as phenols, naphthalene, pyridine, and quinoline. It is one of the most complex and difficult-to-treat industrial wastewater. [0003] At present, the treatment of coking wastewater in China generally adopts the secondary treatment process of pretreatment and biochemical treatment, but after conventional secondary biological treatment, it is difficult to dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/10
Inventor 陈鹏胡绍伟李林王飞刘芳杨大正王永徐伟曲余玲
Owner ANGANG STEEL CO LTD
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