Coal gasification wastewater treatment method and treatment system

A technology of coal gasification wastewater and treatment methods, which is applied in the direction of oxidized water/sewage treatment, natural water treatment, multi-stage water treatment, etc. It can solve the problem of low water quality of evaporation water, failure to meet discharge standards, high concentration of scaling ions, etc. problems, to achieve the effect of prolonging the chemical cleaning cycle, simple structure, and good flocculation

Inactive Publication Date: 2018-12-25
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water quality indicators after biological treatment often cannot meet the discharge standards stipulated by the state. During the operation, there are problems such as severe foam and high chroma of the effluent. It is necessary to increase coagulation sedimentation and quartz sand filtration after secondary or multi-level biochemical treatment. and other processes to make it meet emission standards
Membrane concentration technology has become the current preferred recycling treatment technology due to its high separation efficiency, stable operation, and low operating cost. However, due to problems such as high concentration of organic matter in water and high concentration of scaling ions, it is prone to serious membrane fouling and backwashing. Difficulty, rapid rise in operating pressure difference, etc.
Similarly, due to the high concentration of organic matter, it is easy to cause the problem of low quality of evaporated water

Method used

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  • Coal gasification wastewater treatment method and treatment system
  • Coal gasification wastewater treatment method and treatment system
  • Coal gasification wastewater treatment method and treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment is used to illustrate the method and system for treating waste water from pressurized gasification of pulverized coal of the present invention.

[0053] Such as figure 1 The coal gasification wastewater treatment system shown, the treatment system includes a regulating tank connected in sequence, a biochemical pretreatment unit, a biochemical treatment unit, a first advanced oxidation treatment unit, a first membrane treatment unit, a second advanced oxidation treatment unit, Second membrane treatment unit and evaporation unit. The above-mentioned equipment and structures can be connected sequentially through pipelines.

[0054] Parameters of coal gasification wastewater to be treated: pH value is 7-9, COD cr 3500-4500mg / L, TDS (total dissolved solids) 2000-2500mg / L, unit phenol (calculated as phenol) 250-550mg / L, polyphenol (calculated as phenol) 300-600mg / L, ammonia nitrogen ≤150mg / L.

[0055] In this embodiment, the working temperature of the proc...

Embodiment 2

[0129] This example is used to illustrate the present invention's screening of chemical dosage in the nitrogen flotation process.

[0130] The operation steps and other parameters of this embodiment are basically the same as those of Embodiment 1, the difference is the dosage of the chemicals in the chemical catalytic unit. The test data are shown in Table 1 below.

[0131] Table 1 The effect of the dosage of different chemicals on the effect of wastewater treatment

[0132]

[0133] The above results show that when the dosage of PAC is 40-60 mg / L and the dosage of PAM is 1.2-1.5 mg / L, the oil removal rate of the effluent can be significantly improved. When the dosage is lower than the selected range, the removal rate is not obvious or cannot meet the requirements of biochemical influent water quality; when the dosage is higher than the selected range, the removal rate is not obvious, which will cause economic waste.

Embodiment 3

[0135] This example is used to illustrate the screening of the present invention for a reasonable range of surface load in the nitrogen air flotation separation zone.

[0136] The operation steps and other parameters of this embodiment are basically the same as those of Embodiment 1, except that the surface load value is different. The test data are shown in Table 2 below.

[0137] Table 2 Effect of different surface loads on wastewater treatment effect

[0138]

[0139]

[0140] The above results show that the surface load is 6 ~ 8m 3 / m 2 When h is within the selected range, the oil removal rate of the effluent can be significantly improved. When the surface load is lower than the selected range, the removal rate is not obvious, which will cause economic waste. When the surface load is higher than the selected range, the removal rate is obviously reduced.

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Abstract

The invention provides a method for processing coal-gasification waste water. The method comprises steps: (1) performing oil isolation and air floatation to waste water to obtain air-floated waste water; (2) performing biochemical treatment to the air-floated waste water; (3) performing first advanced oxidation treatment to the biochemical-treated waste water; (4) performing first membrane processing to waste water obtained from first advanced oxidation treatment; (5) performing second advanced oxidation treatment to thick drainage obtained from the first membrane processing; (6) performing second membrane processing to waste water obtained from the second advanced oxidation treatment; and (7) evaporating thick drainage obtained from the second membrane processing above to obtain produced water and a concentrate, and further crystallizing the concentrate. Defects of poor operation stability and effluent quality in conventional technique are overcome. The system has characteristics of low operation cost, stable operation, and high effluent quality.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for coal gasification wastewater and a treatment system for implementing the method. Background technique [0002] Coal gasification wastewater refers to the coal gasification wastewater generated during the pressurized gasification process of coal. Coal gasification wastewater contains a large amount of ammonia nitrogen, phenolic substances, oily substances, cyanides, single-ring aromatic hydrocarbons and polycyclic aromatic hydrocarbons, and heterocyclic compounds containing nitrogen, sulfur, and oxygen, COD cr The concentration is 3000-5000 mg / L, the concentration of unit phenols calculated as phenol is 250-550 mg / L, the concentration of polyphenols calculated as phenol is 300-600 mg / L, and the concentration of ammonia nitrogen is 150-300 mg / L. Coal gasification wastewater has the characteristics of large discharge volume, high concentration of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/04C02F1/24C02F1/40C02F1/441C02F1/444C02F1/463C02F1/4672C02F1/72C02F1/722C02F1/725C02F1/727C02F3/02C02F3/28C02F3/2846C02F9/00C02F2101/16C02F2101/18C02F2101/32C02F2101/322C02F2101/345C02F2103/34C02F2301/08
Inventor 李春启岳子明刘学武梅长松牟伟腾王宝强王金惠张文博
Owner DATANG INT CHEM TECH RESINST
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