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Application of industrial wastewater treatment system in field of industrial wastewater treatment

A technology of industrial wastewater treatment system, which is applied in industrial wastewater treatment system. In the field of industrial wastewater treatment, industrial wastewater treatment, and catalytic cracking flue gas desulfurization wastewater treatment, it can solve the problem that it is difficult to achieve salt balance, affect the effect of biochemical treatment, and pretreatment process. Insufficient and other problems, to achieve the effect of solving the high content of suspended solids

Pending Publication Date: 2021-02-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the cultivation of high-salt biochemical bacteria is more difficult, which affects the effect of biochemical treatment and causes fluctuations in effluent water quality; and dilution and discharge does not reduce the salt content from the source. For example, in some large petrochemical enterprises, desulfurization wastewater is usually combined with other Wastewater is treated as general wastewater after mixing. Although the environmental protection problem is temporarily solved, it will easily lead to a gradual increase in the salt content of the water quality of the sewage reuse enterprise, making it difficult to achieve a salt balance. The use of evaporative crystallization desalination treatment has high operating costs, and the existing Insufficient pretreatment process, incomplete removal of catalyst dust and organic matter in desulfurization wastewater, difficulty in recovering salts to meet national industrial salt standards, and can only be disposed of as solid or hazardous waste
[0004] It is an effective method to use membrane combination technology to support evaporation technology. Patent 201510275955.2 discloses a zero-discharge process for desulfurization wastewater. It uses two-stage softening and then uses ultrafiltration, nanofiltration and reverse osmosis to treat desulfurization wastewater. Use ion exchange, freeze crystallization and evaporation processes to realize the separation and recovery of salts, but this process has the problems of high operating pressure, high pretreatment requirements, large amount of softening and dosing, high energy consumption, and complex equipment in the system.
[0005] Both patent CN201710640319.4 and patent CN201010232059.5 use bipolar membrane electrodialysis to treat sodium-alkali flue gas desulfurization wastewater to achieve zero discharge of desulfurization wastewater, but the system has problems of high investment and high energy consumption

Method used

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  • Application of industrial wastewater treatment system in field of industrial wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In this example, the main water quality characteristics of the treated catalytic cracking flue gas desulfurization wastewater are: pH 7.8, influent conductivity 13000μS / cm, suspended matter 120mg / L, COD 50mg / L, oil content 0.9mg / L , Cl - Concentration 50mg / L, SO 4 2- Concentration 6200mg / L, Mg 2+ Concentration 1.8mg / L, Ca 2+ Concentration 6mg / L, Na + The concentration is 3400mg / L, the dissolved silicon concentration is 5.5mg / L, and the total nitrogen is 30mg / L.

[0072] In this example, the processing system used was:

[0073] Ultrafiltration device using external pressure hollow fiber membrane module;

[0074] A high-pressure reverse osmosis device connected with an ultrafiltration device using a disc-type reverse osmosis membrane module;

[0075] A roll-type reverse osmosis device using a roll-type reverse osmosis membrane module and a pressure nanofiltration device using a high-pressure roll-type nanofiltration membrane module respectively connected to the hig...

Embodiment 2

[0085] In this example, the main water quality characteristics of the treated catalytic cracking flue gas desulfurization wastewater are: pH 8.0, influent conductivity 14000 μS / cm, suspended solids 170 mg / L, oil content 1.2 mg / L, Cl - Concentration 80mg / L, SO 4 2- Concentration 6700mg / L, Mg 2+ Concentration 4mg / L, Ca 2+ Concentration 7.5mg / L, Na + The concentration is 3600mg / L, the dissolved silicon concentration is 6mg / L, and the total nitrogen is 30mg / L.

[0086] In this example, the processing system used is the same as that in Example 1.

[0087] Utilize the above-mentioned treatment system to treat the above-mentioned catalytic cracking flue gas desulfurization wastewater, the treatment steps are:

[0088] The catalytic cracking flue gas desulfurization wastewater enters the ultrafiltration device, and the catalytic cracking flue gas desulfurization wastewater is subjected to ultrafiltration treatment under a pressure of 0.1 MPa, thereby removing solid suspended matt...

Embodiment 3

[0095] In this example, the main water quality characteristics of the treated catalytic cracking flue gas desulfurization wastewater are: pH 8.5, influent conductivity 14500 μS / cm, suspended matter 190 mg / L, COD 50 mg / L, oil content 2.0 mg / L , Cl - Concentration 80mg / L, SO 4 2- Concentration 7000mg / L, Mg 2+ Concentration 5mg / L, Ca 2+ Concentration 10mg / L, Na + The concentration is 4000mg / L, the dissolved silicon concentration is 8mg / L, and the total nitrogen is 30mg / L.

[0096] In this example, the processing system used is the same as that in Example 1.

[0097] Utilize the above-mentioned treatment system to treat the above-mentioned catalytic cracking flue gas desulfurization wastewater, the treatment steps are:

[0098] The catalytic cracking flue gas desulfurization wastewater enters the ultrafiltration device, and the catalytic cracking flue gas desulfurization wastewater is subjected to ultrafiltration treatment under a pressure of 0.12 MPa, thereby removing solid...

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Abstract

The invention provides application of an industrial wastewater treatment system in the field of industrial wastewater treatment, especially in the field of catalytic cracking flue gas desulfurizationwastewater treatment, and the industrial wastewater treatment system comprises: an ultrafiltration device; a high-pressure reverse osmosis device connected with the ultrafiltration device; a roll typereverse osmosis device and a high-pressure nanofiltration device respectively connected with the high-pressure reverse osmosis device; and an evaporative crystallization device connected with the high-pressure nanofiltration device. Through the cooperative use of the ultrafiltration device, the high-pressure reverse osmosis device, the roll type reverse osmosis device, the high-pressure nanofiltration device and the evaporative crystallization device, the respective advantages of the devices are fully combined, and the recovery of water resources in the wastewater is realized on the basis ofeffectively treating the catalytic cracking flue gas desulfurization wastewater.

Description

technical field [0001] The present invention relates to the field of industrial wastewater treatment, in particular to the application of an industrial wastewater treatment system in the field of industrial wastewater treatment, especially in the field of catalytic cracking flue gas desulfurization wastewater treatment. Background technique [0002] As the consumption of fossil fuels continues to increase in modern society, SO X and NO X The amount of air pollutants such as dust and dust will increase accordingly, and a large amount of these substances will be discharged into the atmosphere, which will cause serious air pollution. State and local governments on SO X and NO X And particulate matter emission standards are becoming increasingly stringent and sewage charges are increasing. At the same time, the petrochemical industry pollutant discharge standard (GB31571-2015) requires SO 2 less than 100mg / m 3 , NO X Less than 150mg / m 3 , particles less than 20mg / m 3 . ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/16C01D5/00C02F101/10C02F103/18
CPCC02F1/444C02F1/441C02F1/442C02F1/048C02F1/447C01D5/00C01D5/16C02F2103/18C02F2101/101
Inventor 张新妙魏玉梅栾金义彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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