Advanced treatment method for 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 COD concentration cannot meet the discharge standard, coking wastewater cannot be effectively treated, wastewater Problems such as large chroma, achieve good treatment effect, solve limitations, and stabilize effluent water quality

Active Publication Date: 2014-07-16
SHANDONG SUNYON GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the traditional biological treatment method, the chroma of the wastewater is relatively large, the COD concentration cannot meet the discharge standard, and a small amount of phenols and cyanides remain. Therefore, the biological treatment cannot effectively treat the coking wastewater, and direct discharge into the water body will inevitably cause environmental pollution. Because the external drainage cannot be used for water reuse, a large amount of water resources are wasted. Therefore, it is imperative to explore the advanced treatment process of coking wastewater so that it can be discharged up to the standard and recycled. It is imperative to protect the environment and save enterprise costs. Row

Method used

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  • Advanced treatment method for coking wastewater

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Effect test

Embodiment 1

[0031] The water quality of coking wastewater produced by the biological treatment unit of a coking plant is shown in Table 1. Adopt processing method of the present invention to process, operate as follows:

[0032] The coking wastewater after biological treatment enters the acidification tank, adjusts the pH value of the wastewater to 5 with sulfuric acid, and then enters the electrolytic cell. Electrode plates are installed in the electrolytic cell, and the anode is Ti / SnO 2 , the cathode is Fe, the distance between the anode and the cathode is 1cm, it is powered by a constant voltage and constant current power supply, and the current density is 20mA / cm 2 , the electrolysis time is 60min, the wastewater is continuously fed, and the water plate ratio is 0.3cm 2 / cm 3 ; After the electrolytic treatment, the wastewater enters the alkalization tank, and the pH value of the wastewater is adjusted to 9 with NaOH, the amount of PFS added is 0.3‰, the amount of PAM added is 0.1‰ ...

Embodiment 2

[0036] The water quality of coking wastewater produced by the biological treatment unit of a coking plant is shown in Table 2. Adopt processing method of the present invention to process, operate as follows:

[0037] The coking wastewater after biological treatment enters the acidification tank, adjusts the pH value of the wastewater to 7 with sulfuric acid, and then enters the electrolytic cell. Electrode plates are installed in the electrolytic cell, and the anode is Ti / PbO 2 , the cathode is Al, the distance between the anode and the cathode is 3cm, it is powered by a constant voltage and constant current power supply, and the current density is 40mA / cm 2 , the electrolysis time is 90min, the wastewater is continuously fed, and the water plate ratio is 0.1cm 2 / cm 3 ; After the electrolytic treatment, the wastewater enters the alkalization pool and is treated with Na 2 CO 3Adjust the pH value of the wastewater to 9, add PAC to 0.2‰, add PAM to 0.1‰ (volume ratio), stir ...

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Abstract

The invention provides an advanced treatment method for coking wastewater. The steps of electrolysis, flocculation, advanced treatment, water draining and the like are used for treating the coking wastewater after being treated through a biological method. Waste water is heavy in color after being treated through a traditional biological treatment method, the COD concentration cannot meet the emission standard, and a small amount of phenols and cyanide are remained. The method effectively solves the boundedness of treating the coking wastewater through the biological method, the water quality of discharged water is stable, the water quality standard of reuse of recycled water is met, namely the water quality of urban wastewater reclamation and reuse and urban miscellaneous water (GB / T18920-2002), and the recycling of water resources is achieved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to an advanced treatment method for coking wastewater. Background technique [0002] Coking wastewater is the wastewater of a large number of aromatic compounds and heterocyclic compounds produced in the process of coal coke, gas purification and coking product recovery. Coking wastewater is a recognized industrial wastewater that is difficult to biodegrade. The difficulty of its treatment lies in the high content of cyanide and phenols, the difficulty of biodegradation of polycyclic aromatic hydrocarbons and heterocyclic compounds, and poor biodegradability. High concentrations of ammonia nitrogen inhibit biological activity and lead to biodegradation. Nitrogen does not work well. [0003] At present, the treatment method of coking wastewater mainly adopts biological method for treatment. After the traditional biological treatment method, the chroma of the wastewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 殷自道高桂富殷云华
Owner SHANDONG SUNYON GRP
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