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Treatment method of reverse osmosis concentrated water of coking wastewater

A technology for reverse osmosis concentrated water and coking wastewater, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Low content and other problems, to achieve the effect of saving pharmaceutical costs, achieving zero discharge, and simple operation

Inactive Publication Date: 2013-12-18
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0004] (1) Poor biodegradability
Since the coking wastewater has undergone the previous biochemical treatment process before reverse osmosis, the organic matter content is already very low, and it is no longer suitable for further biochemical treatment.
[0005] (2) High content of toxic and harmful substances
[0006] (3) High salinity
The essence of this invention is to continue to perform reverse osmosis on concentrated water to increase the water yield of reverse osmosis, but it cannot eliminate concentrated water in the traditional sense. At the same time, performing reverse osmosis on concentrated water will cause great damage to equipment and membranes

Method used

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  • Treatment method of reverse osmosis concentrated water of coking wastewater
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example 1

[0032] The present invention is further described as follows in conjunction with accompanying drawing and embodiment:

[0033] A: will go through "A 2 O + coagulation and sedimentation" treated coking wastewater is injected into the container, the flow rate is 2m 3 / h;

[0034] B: Coking wastewater is pretreated by "manganese sand filtration + ultrafiltration membrane", and an appropriate amount of scale inhibitor is added;

[0035] C: reverse osmosis for coking wastewater;

[0036] D: Reverse osmosis concentrated water enters the chemical reactor, and Fenton reagent is added to the chemical reactor, H 2 o 2 Addition amount 1~1000mg / L, Fe 2+ The addition amount is 1-200mg / L, and the reaction time is 1-60min.

[0037] E: Concentrated water passes through a fixed bed composed of natural zeolite, the flow rate is 0.1-10m / s, and the reaction time is 1-60min;

[0038] F: Lime milk was added to the wastewater, and 1-100 mg / L was added.

[0039] G: The treated waste water is ...

example 2

[0041] A coking plant has implemented advanced treatment of coking wastewater. After advanced treatment of coking wastewater with the "ultrafiltration membrane + reverse osmosis membrane" process, the reverse osmosis concentrated water is treated as shown in this article. The scale of treated water is 30m 3 / h, COD, the main water quality parameter before treatment, 80-1010mg / L, NH3-N≤4-10mg / L. After treatment, total hardness (calculated as CaCO3)≤450mg / L, Cl-≤250mg / L, CODcr≤60mg / L, NH3-N≤10mg / L. After concentrated water treatment, the various water quality indicators meet the water quality indicators of the circulating cooling water in the intermediate cold open system of the "Industrial Circulating Cooling Water Treatment Design Specification" (GB50050-2007). After the circulating cooling water system has been in operation for a period of time, its corrosion and structural ratios are controlled within the specified range, and the addition of scale inhibitors in the replenish...

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Abstract

The invention relates to a treatment method of reverse osmosis concentrated water of coking wastewater. The treatment method is characterized by comprising the following steps: (1) adding an Fenton reagent into the reverse osmosis concentrated water of the coking wastewater to remove COD (Chemical Oxygen Demand) in the concentrated water so as to reduce the content of toxic and harmful aromatic hydrocarbon in the concentrated water; (2) removing Ca<2+> and Mg<2+> ions in the concentrated water of the wastewater through an ion exchanger fixed bed; (3) adding alkaline matters into the concentrated water to soften the concentrated water. The treatment method has the advantages that the cost of the reagent is saved, the organic content of treated wastewater is low, and the treated wastewater is low in turbidity; the method is simple to operate and stable and efficient in treatment performance, so that zero emission of the coking wastewater is realized.

Description

Technical field: [0001] The invention belongs to the field of coking wastewater treatment and relates to a treatment method for reverse osmosis concentrated water of coking wastewater. Background technique: [0002] Coking wastewater is a high-concentration industrial wastewater with complex water quality and composition, containing dozens of inorganic and organic compounds, including COD, ammonia nitrogen, rhodanide, phenol, aniline, benzopyrene, etc. At present, the treatment of coking wastewater mostly adopts the method of "biological treatment + coagulation and sedimentation", in which biological treatment includes A / O method, A 2 / O method, A / O 2 Law, A 2 / O 2 law etc. After the wastewater is treated by the above methods, its COD and SS can generally meet the discharge standards stipulated by the state, but the residual amount of aromatic hydrocarbons such as aniline and phenol in the wastewater is still relatively high. [0003] Due to the high amount of toxic and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 田颖王雨刘翠萍马志明王庆华
Owner INNER MONGOLIA BAOTOU STEEL UNION
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