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A method for treating coal dry distillation wastewater

A technology for waste water treatment and coal dry distillation, which is applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of substandard effluent, high treatment difficulty and high treatment cost, and achieve mild operating conditions. , High removal efficiency and mature technology

Active Publication Date: 2021-01-26
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-filtration-extraction dephenolization- pH adjustment-rectification ammonia distillation-biological anoxic-SBR oxidation-CWPO oxidation-coagulation sedimentation method for treating coal dry distillation wastewater, after coal dry distillation wastewater treatment, meet the "Coking Chemical Industry Pollutant Discharge Standard" GB16171-2012

Method used

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  • A method for treating coal dry distillation wastewater
  • A method for treating coal dry distillation wastewater
  • A method for treating coal dry distillation wastewater

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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 coagulation and sedimentation water meet the direct discharge standard of GB16171-2012 in the Discharge Standard of Pollutants for Coking Chemical Industry.

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Abstract

A method for the treatment of coal dry distillation wastewater, which adopts unit combination technologies such as oil separation-cyclone air flotation-filtration-extraction dephenolization-rectification ammonia distillation-biological anoxic-SBR oxidation-CWPO oxidation-coagulation sedimentation, etc. Effectively remove tar, ammonia nitrogen, phenols and other organic pollutants in coal dry distillation wastewater. Among them, the oil removal rate of the cyclone air flotation unit reaches 93.8%, the volatile phenol removal rate of the extraction and dephenolization unit reaches 98.3%; the ammonia nitrogen removal rate of the rectification ammonia distillation unit reaches 95.8%. The technology of the present invention is mature, stable and reliable, and the treated coal dry distillation wastewater meets the direct discharge requirements of GB16171‑2012 in the Discharge Standard for Pollutants in the Coking Chemical Industry, and has popularization value.

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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Patent Type & Authority Patents(China)
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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