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A composite catalyst for advanced treatment of industrial wastewater and its preparation and application

A composite catalyst and advanced treatment technology, applied in physical/chemical process catalysts, oxidized water/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult continuous operation, large dosage, consumption, etc., and achieve oxidation reaction rate and Improved oxidation capacity, improved COD removal rate, and reduced production costs

Active Publication Date: 2019-05-17
NANJING SHENKELONG ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are many deficiencies, the traditional Fenton process uses Fe 2+ As a catalyst, make H 2 o 2 Produced into OH and OH - , but also accompanied by a large amount of sludge Fe(OH) 3 The generation of the application has become a major shortcoming
At the same time, after COD reaches a certain removal rate, it can no longer continue to remove organic matter, which will easily cause H 2 o 2 consumption of medication
[0003] The Fenton fluidized bed is an improved Fenton, through the fluidized bed crystallization of ferrous, to reduce the use of ferrous sulfate, hydrogen peroxide and other chemicals and sludge production, but in the actual operation process, there are the following problems: the fluidized bed is easy to The blockage makes it difficult to continue to operate, and the electricity cost of the fluidized bed rises, offsetting the decrease in the cost of chemicals, and the overall cost has not decreased significantly
[0005] Therefore, seeking a suitable catalyst can solve the problem of catalytic H 2 o 2 The problem of high economic cost of the oxidation process, while expanding the types of oxidized pollutants, makes the catalytic H 2 o 2 The oxidation process is more broad-spectrum and efficient
Solve the problems of large amount of sludge and large dosage of Fenton process in the advanced oxidation method of advanced wastewater treatment; Fenton fluidized bed process is easy to block and difficult to continue to operate; ozone catalytic oxidation process has low treatment efficiency and limited processing capacity, etc.

Method used

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  • A composite catalyst for advanced treatment of industrial wastewater and its preparation and application
  • A composite catalyst for advanced treatment of industrial wastewater and its preparation and application
  • A composite catalyst for advanced treatment of industrial wastewater and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] H at room temperature 3 PW 12 o 40 ·nH 2 O dissolves in H 2 In O, use NaOH to adjust the pH to 4.5-5.0, add KCl, evaporate the solution at 80°C with a rotary evaporator and halve it, refrigerate at 4°C overnight to obtain a white solid, and recrystallize once with water to obtain PW 11 . Weigh molar ratio Fe 2 (SO 4 ) 3 : CuSO 4 ·5H 2 O: MnSO4 ·H 2 O: CoSO 4 ·7H 2 O: NiSO 4 ·6H 2 O=10:5:0.5~0.3:0.03~0.02:0.01 Put in a round bottom flask, add water and stir continuously to dissolve it, heat the solution to 80°C, adjust the pH to 4, add 10 times of PW by weight 11 Reaction 2h. The obtained solid was recrystallized to obtain the parent PW 11 M.

Embodiment 2

[0030] Ethyl orthosilicate: n-butanol: H 2 O was mixed uniformly according to the volume ratio of 3:1:2, and nitric acid was added to adjust the pH to 1, stirred for 1 h, then heated to 45°C and stirred for 3 h, then heated to 80°C and continued to stir until a hydrosol was formed. The resulting hydrosol was dehydrated under vacuum at 45°C for 12h, then calcined for 6h to obtain a dry sol, washed three times with hot water, calcined at 80°C for 6h, and then calcined at 150°C for 6h to obtain a white powder SiO 2 Carrier; white powdered SiO 2 Disperse the carrier in toluene, add APS and mix evenly, SiO 2 :APS at a weight ratio of 2:1, the mixture was refluxed and stirred for 12 hours, and centrifuged to obtain an amine-modified carrier.

Embodiment 3

[0032] The above-prepared APS-SiO 2 with PW 11 M (M=Fe, Cu doped with Mn, Co, Ni) was mixed uniformly at a weight ratio of 2:1, the pH of the solution was controlled to 6-7, stirred for 24 hours, centrifuged, washed several times with distilled water and dried to obtain the composite catalyst SKL-A (PW 11 (M)-APS-SiO 2 ).

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Abstract

The invention relates to an advanced treatment composite catalyst for industrial wastewater as well as a preparation method and application thereof. The composite catalyst-SKL-A is prepared by doping Mn, Co and Ni-substituted polyoxometallate PW11 with Fe and Cu, and then loading the Mn, Co and Ni-substituted polyoxometallate PW11 doped with Fe and Cu onto a modified carrier APS-SiO2. The preparation method can be used for overcoming the following defects: a Fenton process in an advanced oxidation process for advanced wastewater treatment is high in sludge amount and high in chemical feeding amount; a Fenton fluidized bed process is high in blockage possibility and difficult in continuous operation; an ozone catalytic oxidation process is low in treatment efficiency and limited in treatment capacity. The advanced treatment composite catalyst is large in specific surface area, increased in catalytic active points, improved in catalytic activity and improved in oxidation reaction velocity and oxidizing ability, has a favorable treatment effect on non-biodegradable pollutants in industrial wastewater, is low in stripping possibility during a reaction process and can be recycled. Compared with ferrous iron used as a catalyst in a Fenton reaction, the composite catalyst SKL-A is relatively efficient, broad in spectrum, and less in Fe leaching during use, and can be continuously and repeatedly used.

Description

technical field [0001] The invention relates to sewage treatment, in particular to a composite catalyst for advanced treatment of industrial wastewater and its preparation and application. Background technique [0002] Before the present invention was made, the most widely used advanced oxidation process and improved or combined process in the field of advanced wastewater treatment, including traditional Fenton process, Fenton fluidized bed, ozone catalytic oxidation, etc., have achieved different degrees of effect. But there are many deficiencies, the traditional Fenton process uses Fe 2+ As a catalyst, make H 2 o 2 Produced into OH and OH - , but also accompanied by a large amount of sludge Fe(OH) 3 The generation of the application has become a major shortcoming. At the same time, after COD reaches a certain removal rate, it can no longer continue to remove organic matter, and it is easy to cause H 2 o 2 Medication consumption. [0003] The Fenton fluidized bed is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/188C02F1/72
Inventor 田宝凤江双双程成
Owner NANJING SHENKELONG ENVIRONMENTAL PROTECTION