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Coking wastewater treatment method

A technology of coking wastewater and treatment methods, applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problems of high energy consumption, high cost of flue gas desulfurization, secondary pollution and material recycling Insufficient utilization and other issues to achieve the effects of improving the environment, suitable for promotion, and reducing chemical agents and power consumption

Inactive Publication Date: 2017-03-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention provides a new method for coking wastewater treatment, the purpose of which is to solve the problems of high cost of coking wastewater treatment and flue gas desulfurization, high treatment energy consumption, secondary pollution and insufficient material recycling and utilization in the prior art, so that The treated effluent meets the reuse standard, no waste water is discharged in the whole process, and the recycling of water resources can be realized

Method used

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  • Coking wastewater treatment method

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Effect test

Embodiment 1

[0072] A coking wastewater treatment method, characterized in that it comprises the following steps:

[0073] (1) Pretreatment section

[0074] First remove the light oil and heavy oil in the coking wastewater, mix with the separated water after separating the heavy oil, then add coagulant and other agents, and then reduce the ammonia nitrogen in the coking wastewater and remove the slick oil, the treated coking wastewater and the smoke after dedusting The flue gas is contacted in countercurrent, and the sulfur-containing ammonium water generated after the reaction is oxidized to ammonium sulfate under the action of nitrite and air or other oxygen-containing gases, from which ammonium sulfate is extracted, and CO containing water is extracted from the reacted flue gas 2 of ammonia.

[0075] (2) Biological contact oxidation section

[0076] The coking wastewater treated in the pretreatment section is mixed with blast furnace gas washing water pretreated by polymerization and ...

Embodiment 2

[0080] A coking wastewater treatment method, characterized in that it comprises the following steps:

[0081] (1) Pretreatment section

[0082] The coking wastewater from coking, gas purification, and chemical product refining processes first passes through the grease trap 1 to remove light oil and heavy oil in the coking wastewater, and the coking wastewater after oil separation treatment enters the regulating tank 2 and is separated from the oil and water The separated water after the heavy oil is separated by the device 3 is mixed, and then enters the mixing reaction tank 4, and coagulant and other chemicals are added to the mixing reaction tank 4, and then enters the air flotation tank 5, and the chemical (coagulation agent) is added to the air flotation tank 5 to reduce coking Ammonia nitrogen in the wastewater is removed from the slick oil, and the slick oil collected by the oil collection tank 6 is transported outside. The coking waste water after oil separation and ai...

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Abstract

The invention relates to a coking wastewater treatment method. The coking wastewater treatment method includes: firstly, performing pretreatment on coking wastewater by the aid of flue gasses, organically combining flue gas desulfurization and CO2 recovery with coking wastewater treatment, and obtaining fertilizer; secondly, performing joint treatment on drainage subjected to pretreatment and scrubbing water of blast furnace gases and performing dephenolization and cyanide treatment on the drainage and the scrubbing water of the blast furnace gases with a biological contact oxidation process; finally, performing depth treatment on the drainage subjected to biochemical treatment with aerated biofiltration and reverse osmosis methods, outflowing water subjected to treatment reaches reuse standard, no wastewater is discharged during the entire process, and cyclic use of water resources can be realized.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a coking wastewater treatment method. Background technique [0002] The source of coking wastewater is mainly the moisture in coking coal, which is formed by the escape and condensation of coal gas during the high-temperature dry distillation process. There are tens of thousands of organic substances in the gas, and all substances that are soluble or slightly soluble in water will form extremely complex residual ammonia water in the condensate, which is the largest part of coking wastewater. The second is the waste water formed in the process of gas purification, such as desulfurization, ammonia removal and extraction of refined benzene, naphthalene and crude pyridine. The third is the waste water produced in tar processing and crude benzene refining. The amount of this waste water is not large, but the composition is complex. [0003] Coking wastewater is toxic, harmfu...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01C1/24C01C1/26
CPCY02A20/131C02F9/00C01C1/24C01C1/26C02F1/04C02F1/24C02F1/441C02F1/52C02F3/02
Inventor 王连勇吕子强仝永娟孙文强
Owner NORTHEASTERN UNIV
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