CuO-MnOx Supported Catalyst for Wastewater TOC Removal
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Solution Overview
Problem
Current ozone catalytic oxidation catalysts for petrochemical wastewater treatment are inefficient in meeting stringent emission standards due to low degradation rates of refractory organic matters and high ozone dosage requirements, leading to increased operational costs.
Innovation Solution
A supported two-component ozone catalytic oxidation catalyst is prepared using γ-Al2O3 pellets as a carrier, impregnated with copper oxide and manganese oxide, and roasted at 350-400°C to enhance catalytic activity and stability, allowing for improved degradation of organic pollutants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ozone catalytic oxidation catalysts are used for petrochemical wastewater treatment, then the treatment process can be implemented, but the degradation rate of refractory organic matters is low and ozone dosage requirements are high
Solution Approach 1:
The patent uses a composite catalyst structure consisting of γ-Al2O3 as the carrier and CuO-MnOx as the active components. This composite material combines the high surface area and adsorption capacity of alumina with the catalytic activity of copper and manganese oxides, creating a synergistic effect that enhances ozone utilization and improves the degradation rate of refractory organic matters while reducing ozone dosage requirements.
Solution Approach 2:
The patent optimizes several parameters including the CuO:MnOx molar ratio (1:1 to 4:1), roasting temperature (350-400°C), and catalyst dosage (2-10 g/L). These parameter changes are designed to maximize catalytic activity and ozone decomposition efficiency, thereby improving the degradation rate of organic pollutants and reducing the required ozone dosage.
2Productivity
If higher ozone dosage is used to improve degradation rate, then the oxidation efficiency increases, but the operational cost increases
Solution Approach 1:
The CuO-MnOx catalyst acts as an intermediary that facilitates the decomposition of ozone into hydroxyl radicals. This intermediary mechanism allows ozone to be more effectively converted into highly reactive species that can oxidize refractory organic matters, thereby achieving high oxidation efficiency at lower ozone dosages and reducing operational costs.
Solution Approach 2:
The catalyst accelerates the formation of hydroxyl radicals, which are strong oxidants with higher oxidizing power than ozone itself. This accelerated oxidation process enables more efficient degradation of refractory organic matters, achieving better oxidation efficiency without proportionally increasing ozone dosage and operational costs.
3Productivity
If catalyst activity is increased to meet stringent emission standards, then the TOC removal rate improves, but the catalyst stability and service life may be compromised
Solution Approach 1:
The patent creates local active sites on the alumina carrier surface by dispersing CuO and MnOx nanoparticles. This local quality enhancement concentrates catalytic activity at specific locations where ozone decomposition occurs, achieving high TOC removal rates while maintaining overall catalyst stability through the robust alumina support structure.
Solution Approach 2:
The catalyst undergoes a roasting treatment at 350-400°C before use, which is a preliminary action that stabilizes the CuO-MnOx active components and enhances their catalytic activity. This pre-treatment ensures the catalyst achieves optimal performance from the beginning and maintains stability throughout its service life, meeting stringent emission standards sustainably.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The catalyst significantly increases the total organic carbon (TOC) removal rate by more than 50% compared to conventional catalysts, reduces ozone dosage, and extends service life to over 4 years with thermal stability and mechanical durability.
Implementation Method 1
an ozone catalyst oxidizer must be used to improve the efficiency of ozone catalytic oxidation
Implementation Method 2
Ozone has strong oxidizing properties and can oxidize almost all organic pollutants in water bodies
Implementation Method 3
The free radical reaction is to indirectly oxidize organic matters by forming hydroxyl radicals (.OH, E0=2.80V) from ozone
Implementation Method 4
alumina has the following characteristics: (1) good strength and hardness; (2) moderate mass, so that alumina is in a semi-suspended state under the action of water flow; (3) large specific surface area, large porosity, and strong adsorption capacity
Implementation Method 5
roasted at 350-400°C to enhance catalytic activity and stability
Data Source
AI summary
A method for preparing a supported two-component metal oxide ozone catalytic oxidation catalyst for an advanced treatment of a petrochemical wastewater is provided. The supported two-component metal-oxide ozone catalytic oxidation catalyst is prepared from commercially-available active alumina balls by the steps of carrier activation, impregnating liquid preparation, carrier impregnation, catalyst roasting, and catalyst cleaning. The supported two-component metal oxide ozone catalytic oxidation catalyst has product stability, is reusable, and is of significance in application of ozone catalytic oxidation technologies as well as energy conservation and consumption reduction for petrochemical wastewater treatment plants.