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Catalytical ozonization catalyst utilizing multi-source sludge to prepare and application thereof

An ozonation and solid catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, oxidized water/sewage treatment, etc., can solve the problem of high operation and maintenance costs, accelerated ozone decomposition, metal Problems such as difficulty in recycling ions

Active Publication Date: 2013-04-03
TIANJIN UNITED ENVIRONMENTAL ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The catalytic ozonation method for degrading organic matter in water has been put into practice. According to different catalytic methods, catalytic ozonation can be divided into two methods: one is to use the homogeneous catalytic ozonation of metal ions in the solution, and the intervention of metal ions can accelerate the formation of ozone. Decomposition, strengthening the production of active intermediates such as free radicals to improve the oxidation capacity of ozone, also greatly enhanced the utilization rate of ozone, the disadvantage is that there is a problem that it is difficult to recover metal ions in the water after treatment, the utilization rate of the catalyst is reduced, and it will also cause secondary pollution. Secondary pollution, high operation and maintenance costs; the other is heterogeneous catalytic ozonation using metal oxides supported by solid metal oxides and activated carbon as a catalyst. This method has good catalyst stability, and the metal is not easy to lose Introduce secondary pollution, no subsequent treatment is required, and the catalyst can be regenerated and reused

Method used

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  • Catalytical ozonization catalyst utilizing multi-source sludge to prepare and application thereof
  • Catalytical ozonization catalyst utilizing multi-source sludge to prepare and application thereof
  • Catalytical ozonization catalyst utilizing multi-source sludge to prepare and application thereof

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Effect test

Embodiment 1

[0054] The solid catalyst has a skeleton of sludge-based activated carbon, and the surface layer is rich in iron oxides; wherein the ratio of weight and number of sludge-based activated carbon to iron oxides is 1:0.5; the sludge-based activated carbon is composed of sludge, Crushed corn cob, activator ZnCl 2 Composition, sludge: crushed corn cob: ZnCl 2 The ratio of parts by weight is 1:3:0.5.

[0055] Its preparation method is as follows:

[0056] Dehydration: The remaining sludge from the biochemical treatment of the urban sewage plant is dehydrated by a centrifuge to make the water content at 50%; after Fenton oxidation, the iron sludge is dehydrated in a centrifuge to make the water content at 30%;

[0057] Activation: dehydrated sludge, crushed corncobs (100g of corncobs per Kg of water-containing sludge), activator 1.5mol / L ZnCl 2 Solution (add ZnCl per Kg of aqueous sludge 2 The solid content is 50g) into the activation kettle with stirring equipment in turn, st...

Embodiment 2

[0066] A solid catalyst whose skeleton is sludge-based activated carbon and oxides of copper on the surface; the sludge-based activated carbon is composed of sludge, pulverized corncobs, and activator KOH, and sludge: pulverized corncobs: parts by weight of KOH solids The ratio is 1:3:0.5.

[0067] Dehydration: The remaining sludge from the biochemical treatment of the urban sewage plant is dehydrated by a centrifuge to make the water content 40%; after Fenton oxidation, the iron sludge is dehydrated in a centrifuge to make the water content 40%;

[0068] Activation: Mix the dehydrated sludge and crushed corncobs (the amount of corncobs per Kg of water-containing sludge is 200g), and the activator 2moL / L KOH solution (the amount of KOH solids per Kg of water-containing sludge is 150g) in sequence. In an activation kettle with stirring equipment, stir and activate for 8 hours;

[0069] Drying: After activation, the sludge enters the centrifuge for dehydration, so that th...

Embodiment 3

[0075] Solid catalyst regeneration:

[0076] Add the deactivated catalyst to the washing tank, wash it several times with 5% (w / w) NaOH solution, wash it with water until it is neutral, and dry it in the air;

[0077] Then proceed to implement Case 1 Steps to obtain the regenerated catalyst.

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Abstract

The invention discloses a catalytical ozonization catalyst prepared by utilizing multi-source sludge and an application thereof, and establishes a method for preparing a sludge group active carbon catalyst for catalytical ozone oxidation organic industrial waste water. The method comprises the following steps of: utilizing multi-source sludge such as surplus sludge generated by urban sewage factory biochemical treatment and a metal sludge generated by a Fenton oxidation method, preparing a skeleton which is a sludge group active carbon through steps such as organic substance adding, actification, dehydration, drying, mixing, roasting and screening, wherein a surface layer contains a solid catalyst of metallic oxide, and the ratio of the sludge group active carbon and the metallic oxide in parts by weight is 1:(0.3-0.5). The catalyst is used for catalyzing ozone oxidation treatment organic industrial waste water and has higher catalytic activity and stability, the processing range is wide, the realization and popularization and application are easy, and the economic benefits are improved in an organic industrial waste water processing procedure.

Description

technical field [0001] The invention belongs to the technical fields of wastewater treatment technology and environmental functional materials. The invention relates to a method for preparing a sludge-based activated carbon solid catalyst for catalyzing ozonation by using sludge produced by biochemical treatment of urban sewage plants and metal sludge produced by Fenton oxidation. Background technique [0002] The biochemical treatment method of urban sewage plants is to continuously mix and cultivate sewage and various microbial groups under artificial oxygenation conditions to form activated sludge. The biological coagulation, adsorption and oxidation of activated sludge are used to decompose and remove organic pollutants in sewage. Then the sludge and water are separated, most of the sludge is returned to the aeration tank, and the excess is discharged from the activated sludge system. Because of its mature technology, simple procedure and low cost, it has become the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/70B01J23/745B01J23/72C02F1/78C01B31/08B01J20/20C02F101/30C02F103/28C02F103/30C02F103/38C01B32/324C01B32/348
Inventor 游洋洋许丹宇卢学强郑先强杨昂宋薇薇
Owner TIANJIN UNITED ENVIRONMENTAL ENG DESIGN
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