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Method for decyanating coking wastewater

A coking wastewater and decyanation technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems that affect the cyanide in wastewater and the removal of pollutants such as COD, and reduce the Load, less investment, simple operation method

Inactive Publication Date: 2011-04-27
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC +1
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Problems solved by technology

[0008] The treatment of coking wastewater mainly adopts the A / O biological denitrification treatment method, which is a biological treatment method, but the high cyanide content in the wastewater has an inhibitory effect on microorganisms, which not only affects the cyanide in the treated wastewater to meet the standard, but also affects COD, etc. Pollutant removal

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Embodiment Construction

[0020] A method for decyanation of coking wastewater, which is used for decyanation of coking wastewater desulfurized by vacuum potassium carbonate method. The method uses ferrous sulfate complex decyanation to reduce the total cyanide content in raw sewage and reduce its impact on biochemical treatment. Lay the foundation for cyanide compliance. Its reaction principle is as following equation:

[0021] FeSO 4 +6KCN→K 4 Fe(CN) 6 +K 2 SO 4

[0022] 3K 4 Fe(CN) 6 +2Fe 2 (SO 4 ) 3 → Fe 4 [Fe(CN) 6 ] 3 ↓(Prussian blue)+6K 2 SO 4

[0023] Cyanide ions react with ferrous ions and iron ions to form water-insoluble ferrocyanide blue precipitate (Prussian blue), and then separate the precipitate from coking wastewater, so that cyanide in coking wastewater can be removed. After decyanation pretreatment, the wastewater enters the biochemical treatment system. The total cyanide in the wastewater should be controlled below 15mg / l, and the cyanide should be controlled below...

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Abstract

The invention relates to a method for decyanating coking wastewater, comprising the following steps of: decyanating by using ferrous sulfate to complex; reacting cyanide ions with ferrous irons and iron ions to generate ferric ferrocyanide which is insoluble in water and is called as Prussian blue precipitation; and then separating the precipitation from water to remove cyanide in the water and controlling the total cyanide in the wastewater entering a biochemical system below 15mg / l and the cyanide below 8mg / l. Compared with the prior art, the invention has the benefits that: in the method, the decyanating is carried out by using ferrous sulfate to complex; the operation method is simple and requires less investment, and the cyanide in the ammonia-evaporating wastewater can be removed effectively and the smooth operation of the subsequent biological treatment of the coking wastewater can be ensured; meanwhile, by using the flocculation action of the ferrous sulfate, oil and suspension in the coking wastewater and Prussian blue can be flocculated and precipitated together, thereby achieving the functions of removing the oil and the suspension by flocculation, creating the beneficial microorganism environment for biochemical treatment and reducing the biochemical treatment load.

Description

technical field [0001] The invention relates to a method for decyanation treatment of wastewater in the coking industry. Background technique [0002] At present, a common gas desulfurization method in the coking industry is the vacuum potassium carbonate desulfurization method, which is an absorption desulfurization process. The reaction process is a reversible reaction of absorption and desorption. Theoretically, there is no waste liquid. Oxygen, there will inevitably be a small amount of oxidation side reaction to generate a small amount of salt, so a small amount of waste liquid must be discharged. The waste water produced by this desulfurization process not only contains organic pollutants, ammonia, sulfide, but also contains high cyanide. Potassium cyanide (KCN) and potassium ferricyanide (K 4 Fe(CN) 6 ) in the form of ), the following is a typical example: [0003] The water quality of desulfurization waste liquid is as follows: [0004] waste liquid ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/10
Inventor 尹君贤李丽洁张一红
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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