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Treatment method of coking waste water

A technology for coking wastewater and treatment method, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of poor biodegradability of wastewater, unsatisfactory treatment effect, and complex coking wastewater composition. Changes and other issues, to achieve the effect of protecting the ecological environment

Active Publication Date: 2013-01-30
ANGANG STEEL CO LTD
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AI Technical Summary

Problems solved by technology

This method is mainly used for the treatment of high ammonia nitrogen, and it is still not ideal for the treatment of refractory organic matter.
[0006] 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, which makes the treatment effect unsatisfactory in the treatment, and the effluent quality is difficult to meet the current conditions. In view of the current situation of discharge standards, it is necessary to develop a coking wastewater treatment process with good treatment effect and stable effluent quality in view of the above problems, which can not only maintain the surrounding ecological environment, but also have important practical significance for the sustainable development of enterprises

Method used

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  • Treatment method of coking waste water
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  • Treatment method of coking waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A: Biochemical treatment of coking wastewater:

[0023] Use A 2The O process, that is, the anaerobic-anoxic-aerobic biological denitrification process, adopts the activated sludge method, and the activated sludge is inoculated with the sludge from the secondary sedimentation tank of the coking wastewater treatment plant. The pretreated wastewater is first pumped into the anaerobic tank, and the sludge concentration in the anaerobic tank is controlled to be 7000mg / L, and the residence time is controlled at 10h; L, the residence time is controlled at 15h; the effluent from the anoxic tank flows into the aerobic tank, and the sludge concentration in the aerobic tank is controlled to 4000mg / L, and NaHCO is added 3 The solution controls the pH of the wastewater to be 7, the residence time is controlled at 15h, the effluent flows into the secondary settling tank, the sludge reflux ratio of the secondary settling tank is controlled to 1:1, the nitrification liquid reflux rati...

Embodiment 2

[0027] The experimental parameters in embodiment 2 and embodiment 3 are selected with reference to table 1.

[0028] Table 1 Experimental parameters of each embodiment

[0029]

[0030] The main water quality indicators of coking wastewater influent are: COD: 3460mg / L, ammonia nitrogen: 140mg / L, volatile phenols: 1050mg / L, total cyanide: 30mg / L, pH: 8.5, each embodiment has undergone the above biochemical treatment + advanced treatment Finally, the main indicators of the effluent are shown in Table 2.

[0031] Table 2 The removal effect of each embodiment on pollutants

[0032]

[0033] From the results in Table 2, it can be seen that the coking wastewater after the above biochemical treatment + advanced treatment, COD≤50mg / L, ammonia nitrogen≤8mg / L, volatile phenol≤0.3 mg / L, total cyanide≤0.2 mg / L, the process effluent water quality Stable and meet the requirements of comprehensive sewage discharge standards.

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Abstract

The invention discloses a treatment method of coking waste water, which comprises a biochemical treatment process of the coking waste water and an advanced treatment process of the coking waste water, wherein the biochemical treatment of the coking waste water adopts an A2O process; and the advanced treatment of the coking waste water adopts a method of internal electrolysis, Fenton oxidation coagulative precipitation and active carbon adsorption. In the method, an anaerobic pool, an anoxic pool and an aerobic pool are used for biochemical treatment; and internal electrolysis, Fenton oxidation coagulative precipitation and active carbon adsorption are used as an advanced section for treating the coking waste water. After the high-concentration coking waste water is treated by the method, the water quality of the effluent water can meet the sewage comprehensive discharge standard requirement that the COD (chemical oxygen demand) is no more than 50 mg / L, the ammonia nitrogen content is no more than 8 mg / L, the volatile phenol content is no more than 0.3 mg / L and the total cyanogen content is no more than 0.2 mg / L. Thus, the invention can protect the ecological environment, and has an important practical meaning for the sustainable development of coking enterprises.

Description

technical field [0001] The invention belongs to the technical field of water treatment equipment, and in particular relates to a treatment method for coking wastewater. Background technique [0002] Coking wastewater is wastewater produced in the process of coal coke, gas purification and chemical product refining. heterocyclic and polycyclic aromatic compounds (PAHs). Because cyanide, polycyclic aromatic hydrocarbons and heterocyclic compounds are difficult to biodegrade, and high concentration of ammonia nitrogen has a strong inhibitory effect on microbial activity, resulting in poor biodegradability of wastewater, coking wastewater has always been recognized as the most difficult industry to treat. One of the wastewater. With the rapid development of my country's iron and steel industry and the continuous expansion of coke production capacity, the amount of coking wastewater produced is also increasing. The issue of its up-to-standard discharge has attracted more and mo...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 陈鹏胡绍伟王飞王永马光宇耿继双徐伟
Owner ANGANG STEEL CO LTD
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