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Coal chemical industry wastewater pretreatment method

A technology for coal chemical wastewater and pretreatment, which is applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc. Poor ability, etc.

Pending Publication Date: 2021-04-09
陕西德信祥能源科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a coal chemical wastewater pretreatment method, which solves the problem of poor oil removal effect, serious fouling of the deacidification and deammonification system, short operation period, substandard crude phenol product, unreasonable heat utilization, high operating cost and impact resistance in the prior art. The problem of poor ability

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Embodiment Construction

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and through specific embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] The invention provides a method for pretreatment of coal chemical wastewater. The coal chemical wastewater is degreased and solid suspended in the form of heavy oil, light oil and oil residue in the form of floating oil and dispersed oil in the wastewater, and recovered as heavy oil and light oil respectively. Oil and oil residue; oil and solid waste water is saturated with acid gas through the pre-deoiling system, and then the emulsified oil and dissolved oil ...

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Abstract

The invention discloses a coal chemical industry wastewater pretreatment method, which belongs to the technical field of coal chemical industry wastewater treatment, and comprises the following steps of: oil removal and solid removal, pre-deoiling, deacidification and deamination, extraction and dephenolization, solvent / phenol recovery and deep dephenolization. According to the coal chemical industry wastewater pretreatment method, heavy oil, light oil, oil residues, ammonia, acidic components and phenol in the wastewater are removed, the operation load of a subsequent biochemical treatment section is reduced, and favorable conditions are created for biochemical treatment of the wastewater; floating oil, dispersed oil, emulsified oil and dissolved oil in the wastewater are removed in advance before deacidification and deamination, so that the problem of pollution and blockage of a deacidification and deamination system is solved; through deep dephenolization, the phenol content of the pretreated purified water is further reduced, and the impact resistance of a subsequent biochemical treatment section is improved; and the recycled heavy oil, light oil, oil residues, acid gas, crude ammonia gas and crude phenol are sent out as products, and recycling treatment and comprehensive utilization of the coal chemical industry wastewater are achieved.

Description

technical field [0001] The invention relates to a method for pretreatment of coal chemical wastewater, belonging to the technical field of coal chemical wastewater treatment. Background technique [0002] Coal chemical wastewater refers to the industrial wastewater produced by coal coking, dry distillation and gasification, which is generally brown or brown, with a pH of 7-10 and alkaline. Coal chemical wastewater has a complex composition and is a difficult-to-treat industrial organic wastewater with high oil, high COD, high ammonia nitrogen, and high phenol value. Oil, phenol, ammonia, low-boiling hydrocarbons, H 2 S and CO 2 Suspended solids such as acidic components, oil residues, etc., all need to be pretreated and removed before the biochemical treatment of wastewater. The oil entrained in the wastewater is mainly slick oil, dispersed oil, emulsified oil and tar in the form of dissolved oil, including light oil with a specific gravity of 0.96-0.98 and heavy oil with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/16C02F101/34
CPCC02F9/00C02F1/40C02F1/001C02F1/66C02F1/26C02F1/285C02F1/04C02F2101/16C02F2101/345
Inventor 刘超杰
Owner 陕西德信祥能源科技有限公司
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