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Technology and device for treating catalytic cracking desulfurization waste water

A technology of desulfurization wastewater and catalytic cracking, applied in the field of water treatment, can solve the problems that enterprises cannot bear, high treatment cost, high salt content, etc., and achieve the effect of saving consumption

Pending Publication Date: 2017-11-03
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned wastewater meets the conventional indicators such as COD, but the salt content is very high, even if it is mixed with other wastewater and discharged, it cannot meet the standard, so it needs to be considered for separate desalination treatment
If the evaporation and crystallization route is adopted, not only the treatment cost is high, but the miscellaneous salt produced is difficult to be effectively treated and utilized because it contains a small amount of organic matter, and needs to be further disposed of as hazardous waste
At present, the treatment cost of the solid waste treatment center is as high as 3000-4000 yuan / t, which is unbearable for enterprises

Method used

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  • Technology and device for treating catalytic cracking desulfurization waste water
  • Technology and device for treating catalytic cracking desulfurization waste water
  • Technology and device for treating catalytic cracking desulfurization waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0046] use as figure 1 In the device shown, the catalytic cracking desulfurization wastewater is discharged into the slurry tank, mixed and reacted with the dosing agent containing sodium hydroxide and sodium carbonate, and the concentration of NaOH is higher than that of Mg in completely precipitated brine 2+ Concentration greater than 0.1g / L, Na 2 CO 3 The dosing concentration is higher than the Ca in the complete precipitation brine 2+ and Ba 2+ The maximum concentration is 0.2g / L.

[0047] The waste water after the reaction enters the ultrafiltration, and the ultrafiltration membrane used is a ceramic membrane with an average pore size of 50nm, which intercepts the suspended matter such as magnesium hydroxide and calcium carbonate to realize solid-liquid separation. The ultrafiltration permeate is used in the resin system to deeply remove metal ions such as calcium and magnesium. The sodium-type cation exchange resin is used, and the flow rate of the upper column liqui...

Embodiment 2

[0050] use as figure 1 In the device shown, the catalytic cracking desulfurization wastewater is discharged into the slurry tank, mixed and reacted with the dosing agent containing sodium hydroxide and sodium carbonate, and the concentration of NaOH is higher than that of Mg in completely precipitated brine 2+ Concentration greater than 0.3g / L, Na 2 CO 3 The dosing concentration is higher than the Ca in the complete precipitation brine 2+ and Ba 2+ The maximum concentration is 0.4g / L.

[0051] The waste water after the reaction enters the ultrafiltration, and the ultrafiltration membrane adopted is a ceramic membrane with an average pore size of 20nm, which intercepts the generated suspended matter such as magnesium hydroxide and calcium carbonate, and realizes solid-liquid separation. The ultrafiltration permeate is used in the resin system to deeply remove metal ions such as calcium and magnesium. The sodium-type cation exchange resin is used, and the flow rate of the up...

Embodiment 3

[0054] use as figure 1 In the device shown, the catalytic cracking desulfurization wastewater is discharged into the slurry tank, mixed and reacted with the dosing agent containing sodium hydroxide and sodium carbonate, and the concentration of NaOH is higher than that of Mg in completely precipitated brine 2+ Concentration greater than 0.2g / L, Na 2 CO 3 The dosing concentration is higher than the Ca in the complete precipitation brine 2+ and Ba 2+ The maximum concentration is 0.2g / L.

[0055] The waste water after the reaction enters the ultrafiltration, and the ultrafiltration membrane used is a ceramic membrane with an average pore size of 50nm, which intercepts the suspended matter such as magnesium hydroxide and calcium carbonate to realize solid-liquid separation. The ultrafiltration permeate is used in the resin system to deeply remove metal ions such as calcium and magnesium. The sodium-type cation exchange resin is used, and the flow rate of the upper column liqui...

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Abstract

The invention provides a technology and a device for treating catalytic cracking desulfurization waste water. High salinity wastewater produced by a desulfurization system of a catalytic cracking unit of an oil refinery is adopted as a raw material, calcium and magnesium ions are removed through adding chemical, then filtering is performed by using a ceramic membrane, the filtered clear liquid is deep treated through resin, then concentration is performed by using electroosmosis, and finally the waste water is changed into acid and alkaline solutions through a bipolar membrane. Compared with a common evaporation method, by using the method provided by the invention for treating the high salinity wastewater from the catalytic cracking system, produced alkali can be recycled, and resource utilization of waste salt is realized.

Description

technical field [0001] The invention relates to a process and a device for treating catalytic cracking desulfurization wastewater, belonging to the technical field of water treatment. Background technique [0002] The desulfurization of catalytic cracking regenerated flue gas mostly adopts the sodium hydroxide alkali solution absorption method, and some flue gas denitrification enterprises adopt the ozone oxidation method, which essentially transfers the pollutants in the exhaust gas to the desulfurization slurry, resulting in a stream of Flue gas desulfurization and denitrification wastewater with high salt content (referred to as flue gas dehydration). [0003] Catalytic oxidation flue gas desulfurization and denitrification are generally equipped with wastewater treatment facilities, mainly including coagulation-clarification / filtration to remove suspended solids, and air aeration to oxidize sulfite to sulfate to remove "false" COD. [0004] At present, some areas have...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/18
CPCC02F9/00C02F2209/06C02F2209/08C02F2305/026C02F2301/08C02F2103/18C02F2001/425C02F1/64C02F1/58C02F1/62C02F1/4693C02F1/42C02F1/444
Inventor 曹恒霞杨积衡方遒彭文博范克银
Owner JIANGSU JIUWU HITECH
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