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Coal gasification wastewater zero-emission treatment method, treatment system and application thereof

A technology for coal gasification wastewater and a treatment method, which is applied in the fields of treatment systems, coal gasification wastewater treatment, and treatment methods for zero discharge of coal gasification wastewater, can solve problems such as large emissions, reduce water consumption, save water resources, and reduce pollution risks Effect

Inactive Publication Date: 2013-09-11
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment method and treatment system of the present invention fully consider the problem of large discharge of coal gasification wastewater, and adopt the idea of ​​gradually decreasing water volume to achieve the purpose of saving water resources

Method used

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  • Coal gasification wastewater zero-emission treatment method, treatment system and application thereof
  • Coal gasification wastewater zero-emission treatment method, treatment system and application thereof
  • Coal gasification wastewater zero-emission treatment method, treatment system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 As shown, the treatment system of the present invention includes a biochemical treatment unit (2), a desalination unit (3), a concentrated brine treatment unit (4) and an evaporation unit (5) including an evaporator.

[0049] Such as figure 2 As shown, the biochemical treatment unit (2) includes an anaerobic tank (11), an anoxic tank (12), an aerobic tank (13) and a sedimentation tank (14) connected in sequence.

[0050] Such as image 3 As shown, the desalination unit (3) includes a coagulation sedimentation tank (16) fed with a coagulant, an ozonation reactor (17) fed with ozone (for example, filled with 30% activated carbon Filled circular tower structure ozone oxidation reactor), biological aerated filter (18) (such as biological aerated filter filled with ceramsite filter material inside), the second ultrafiltration system (19) (such as including self- Cleaning filters and ultrafiltration membranes can use submerged ultrafiltration systems made...

Embodiment 2

[0079] As an alternative to the concentrated brine treatment unit (4) described in Example 1, the present invention can also adopt Figure 5 The shown concentrated brine treatment unit ( 4 ) performs concentrated brine treatment.

[0080] Such as Figure 5 As shown, the concentrated brine treatment unit (4) omits the manganese sand filter (33) connected between the multimedia filter (25) and the first ultrafiltration system (26).

[0081] When the treatment system of this embodiment is used for zero discharge treatment of coal gasification wastewater (1), steps a, b and d in Example 1 can be followed. Such as Figure 5 As shown, when implementing step c, the effluent from the multimedia filter (25) can be directly passed into the first ultrafiltration system (26).

[0082] When adopting the treatment method of this embodiment to carry out zero-discharge treatment of coal gasification wastewater (1), the following parameters can be used:

[0083] The hydraulic retention tim...

Embodiment 3

[0102] Such as Image 6 As shown, the present invention can also use the pretreatment unit (32) to pretreat the coal gasification wastewater (1).

[0103] Such as Figure 7 As shown, the pretreatment unit (32) includes a regulating tank (10) communicated with the anaerobic tank (11) and provided with a stirring device inside.

[0104] When the treatment system of this embodiment is used for zero discharge treatment of coal gasification wastewater (1), steps b, c and d in Example 2 can be followed. Such as Figure 7 As shown, when implementing step a, the coal gasification waste water (1) needs to be first passed into the regulating tank (10) and then into the anaerobic tank (11).

[0105] When adopting the treatment method of this embodiment to carry out zero-discharge treatment of coal gasification wastewater (1), the following parameters can be used:

[0106] The hydraulic retention time in the regulating tank (10): 20h,

[0107] The hydraulic retention time in the anae...

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Abstract

The invention provides a coal gasification wastewater zero-emission treatment method, a treatment system and an application thereof. The treatment system provided by the invention can respectively perform biochemical treatment, desalting and concentrated saline treatment on coal gasification wastewater through a biochemical treatment unit, a desalting unit and a concentrated saline treatment unit, clear water produced by each step can be reused, the produced high-salinity concentrated water can enter the next step for treatment, evaporation is finally performed through an evaporation unit, the clear water produced after evaporation can be used for water supply of a boiler, and the produced concentrated water can be used for flushing ash and slag. The treatment system provided by the invention can realize wastewater zero-emission treatment so as to achieve the purpose of saving water resources.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment. Specifically, the present invention relates to a coal gasification wastewater treatment technology, in particular to a zero-discharge treatment method, treatment system and application of coal gasification wastewater. Background technique [0002] The wastewater produced in the process of coal gasification technology contains a large amount of ammonia nitrogen, phenolic substances, single-ring aromatic hydrocarbons and polycyclic aromatic hydrocarbons, and heterocyclic compounds containing nitrogen, sulfur, and oxygen, as well as some oils and cyanides, COD cr (i.e. using potassium dichromate (K 2 Cr 2 o 7 ) as an oxidizing agent measured in high concentrations. Coal gasification wastewater has the characteristics of large wastewater discharge, high concentration of refractory organic pollutants, and difficult treatment. It is recognized as one of the difficult-to-treat industrial wa...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCY02A20/131
Inventor 安洪光李春启岳子明刘俊峰梅长松宋学平赵荧李国胜王宝强
Owner DATANG INT CHEM TECH RESINST
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