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Slack coal pressure gasification wastewater treatment method and treatment system as well as application

A technology for pressurized gasification of crushed coal and wastewater treatment, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Frequent replacement and other problems, to achieve the effect of improving operating throughput and chemical cleaning cycle, reducing equipment investment costs and operating costs, and improving chemical cleaning cycle

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

Commonly used wastewater reuse treatment technologies include electrochemical precipitation, advanced oxidation, membrane separation, and adsorption methods. Among them, membrane separation technology has become the current preferred reuse treatment technology because of its high separation efficiency, stable operation, and low operating costs. , but because the crushed coal pressurized gasification wastewater still contains a relatively high concentration of organic matter (COD cr About 200mg / L), and it is a macromolecule (mainly benzene ring substance) refractory organic matter, the direct use of membrane separation technology has disadvantages such as serious membrane pollution, difficult backwashing, and rapid rise in operating pressure difference
In order to remove organic matter in water, activated carbon filtration has been added before membrane separation to reduce COD cr purpose, but it is easy to saturate activated carbon adsorption, and there are disadvantages such as frequent replacement of activated carbon, high operating costs, and high frequency of backwashing
[0005] Chinese patent CN101857331A discloses a zero-discharge treatment method and system for coal chemical wastewater. The invention involves the use of an activated coke filter bed as a membrane pretreatment process before multi-stage membrane separation. The activated coke is used to adsorb and degrade most of the organic matter in the water to reduce The characteristics of the risk of membrane fouling, but ignore the shortcomings of the limited adsorption capacity of activated coke, there are problems such as high backwash frequency of activated coke, frequent replacement of activated coke, large amount of coke added, etc., a large amount of waste coke will become a new secondary Pollutants
In this treatment process, the adsorption of activated carbon powder is used to absorb the organic matter in the water so as to reduce COD cr However, since the aeration tank contains a large amount of sticky sludge, it will adhere to the activated carbon powder, which limits the adsorption capacity of the activated carbon, which can easily cause unstable water quality, and the organic matter in the effluent is still macromolecular organic matter. When entering the ultrafiltration system, it will foul the ultrafiltration membrane and affect the service life and operation stability of the ultrafiltration membrane

Method used

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  • Slack coal pressure gasification wastewater treatment method and treatment system as well as application
  • Slack coal pressure gasification wastewater treatment method and treatment system as well as application
  • Slack coal pressure gasification wastewater treatment method and treatment system as well as application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment is used to illustrate the method and system for treating waste water from pressurized gasification of pulverized coal of the present invention.

[0041] Such as figure 1 The crushed coal pressurized gasification wastewater treatment system shown includes a coagulation sedimentation unit, a chemical catalysis unit, an aerated biological filtration unit, a multimedia filtration unit, an ultrafiltration unit and a reverse osmosis unit connected in sequence. In actual construction, existing equipment and technologies with the above functions can be selected. For example, the coagulation-sedimentation unit can be a coagulation-sedimentation tank, the chemical catalysis unit can be a chemical catalysis reaction tank, and the aerated biological filtration unit can be an aeration tank. Biofilter, the multimedia filter unit can be a multimedia filter, etc. The above-mentioned equipment and structures can be connected sequentially through pipelines.

[0042] The...

Embodiment 2

[0104] This example is used to illustrate the present invention's screening of ozone dosage.

[0105] The inventors found that the dosage of ozone can affect the treatment effect of wastewater. Therefore, the inventors studied the influence of different dosages of ozone on the process results. The operation steps and other parameters of this embodiment are basically the same as those of Embodiment 1, the difference is the dosage of ozone in the chemical catalytic unit. The test data are shown in Table 1 below.

[0106] Table 1 The effect of the dosage of ozone on the effect of wastewater treatment

[0107]

[0108] Note:

[0109] *: Refers to the rapid rise of the pressure difference of the ultrafiltration unit, which requires frequent backwashing and cleaning, and the cleaning cycle is short;

[0110] **: Ultrasonic treatment (ultrasonic frequency: 25~35kHz) is added on the basis of the dosage of ozone.

[0111] The above results show that when the dosage of ozone is ...

Embodiment 3

[0113] This example is used to illustrate the screening of the filter material of the biological aerated filter according to the present invention.

[0114] The inventor also studied the influence of different filter materials in the biological aerated filter unit on the treatment effect. Likewise, the operation steps and other parameters of this embodiment are basically the same as those of Embodiment 1, the difference is the type of filter material in the biological aerated filtration unit. The test data are shown in Table 2 below.

[0115] Table 2 Effect of filter material type on wastewater treatment effect

[0116]

[0117] Note:

[0118] *: Mainly refers to active coke with a particle size of 3-5mm and an average pore size of 4-16nm;

[0119] **: The pressure difference of the ultrafiltration system rises rapidly, requiring frequent backwashing and cleaning, and the cleaning cycle is short.

[0120] The above results show that the selection of activated coke as th...

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Abstract

The invention provides a slack coal pressure gasification wastewater treatment method and treatment system as well as application. The treatment method sequentially comprises the following steps of: (1) performing coagulating sedimentation on the wastewater to obtain wastewater after the coagulating sedimentation treatment; (2) performing chemical catalysis on the wastewater obtained by the step (1) to obtain wastewater after the catalytic oxidation treatment; (3) performing aeration biofiltration on the wastewater obtained by the step (2) to obtain wastewater after the aeration biofiltration treatment; and (4) performing membrane separation on the wastewater obtained by the step (3) to obtain dischargeable / recyclable water.

Description

technical field [0001] The present invention relates to a wastewater treatment method and treatment system, in particular to a treatment method for crushed coal pressurized gasification wastewater, and a system for treating crushed coal pressurized gasification wastewater used in the method and the method or The application of the system in the treatment of crushed coal pressurized gasification waste water. Background technique [0002] Crushed coal pressurized gasification wastewater is the coal gasification wastewater produced during the process of crushed coal pressurized gasification. The 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, among which COD cr (referring to the use of potassium dichromate (K 2 Cr 2 o 7 ) measured as an oxidizing agent (ie, dichromate index) concen...

Claims

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Application Information

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