Method for treatment of wastewater from dry distillation of coal

A technology for waste water treatment and coal dry distillation, which is applied in multi-stage water treatment, water/sewage treatment, biological water/sewage treatment, etc. High removal efficiency and mature technology

Active Publication Date: 2018-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Aiming at the problems of high difficulty in the treatment of coal dry distillation wastewater, high treatment cost, substandard effluent and environmental pollution, the purpose of the present invention is to provide a method for the treatment of coal dry distillation wastewater, that is, oil separation-swirl air flotation-filtr

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  • Method for treatment of wastewater from dry distillation of coal
  • Method for treatment of wastewater from dry distillation of coal
  • Method for treatment of wastewater from dry distillation of coal

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Embodiment 1

[0031] Coal dry distillation wastewater was treated by oil separation - cyclone air flotation - filtration - extraction and dephenolization - rectification and ammonia distillation - biological anoxic - SBR oxidation - CWPO oxidation - coagulation sedimentation, the treatment capacity is 3L / d, the treatment results are shown in Table 2.

[0032] Table 2 The results of circulating ammonia water treated by combined process

[0033]

[0034] As can be seen from Table 2, the oil content in the effluent of cyclone air flotation dropped from 1215mg / L to 75.35mg / L, and the removal rate reached 93.8%; 98.3%; the ammonia nitrogen in the effluent of rectification and distilled ammonia dropped from 4156 to 174.2mg / L, and the removal rate reached 95.8%. COD, oil, volatile phenol and ammonia nitrogen in the effluent of coagulation and precipitation meet the direct discharge standard of GB16171-2012 in the Discharge Standard of Pollutants for Coking Chemical Industry.

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Abstract

The invention provides a method for treatment of wastewater from dry distillation of coal. By adopting a technology of combining units of oil isolation, cyclone air flotation, filtration, extraction dephenolization, rectification and ammonia distillation, biological oxygen deprivation, SBR oxidation, CWPO oxidation, coagulation sedimentation and the like, the method can effectively remove organicpollutants like coal tar, ammonia nitrogen and phenols in the wastewater from dry distillation of the coal, wherein the oil removal rate of a cyclone air flotation unit reaches 93.8%; the volatile phenol removal rate of an extraction dephenolization unit reaches 98.3%; and the ammonia nitrogen removal rate of a rectification and ammonia distillation unit reaches 95.8%. The method provided by the invention has mature technology, is stable and reliable, can treat the wastewater from dry distillation of the coal to reach the direct discharge requirements of the Emission Standard of Pollutants forCoking Chemical Industry GB16171-2012, and has popularization values.

Description

technical field [0001] The invention belongs to a method for the treatment of coal chemical wastewater, in particular to coal dry distillation for oil separation-swirl air flotation-filtration-extraction dephenolization-rectification ammonia distillation-biological anoxic-SBR oxidation-CWPO oxidation-coagulation precipitation A method for waste water, the method can effectively remove organic pollutants such as tar, ammonia nitrogen, phenols, cyanide and the like in coal chemical industry waste water, especially coal dry distillation waste water, and belongs to the technical field of waste water treatment. Background technique [0002] Traditional coal processing methods are mainly divided into two methods: high-temperature coking and low-temperature dry distillation. High-temperature coking is often used to produce coke, and at the same time additionally produce coal tar and gas. The high-temperature coking temperature can reach up to 900-1100°C. Low-temperature dry distil...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/04C02F1/24C02F1/26C02F1/385C02F1/40C02F1/5236C02F1/54C02F1/66C02F1/722C02F1/725C02F3/1263C02F3/28C02F3/30C02F9/00C02F2101/16C02F2101/18C02F2101/345C02F2301/08
Inventor 于永辉孙承林赵颖
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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