Multi-stage Wastewater Oxidation Apparatus for Ozone Utilization
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Solution Overview
Problem
Current ozone and hydrogen peroxide oxidation methods for wastewater treatment suffer from low ozone utilization efficiency, uneven mixing, and reduced photocatalytic reaction efficiency, leading to increased treatment costs and inefficiencies.
Innovation Solution
A multi-stage apparatus and process involving a liquid-liquid mixing unit, preheating, gas-liquid mixing, parallel photocatalytic reactors, and an oxidation tower, which ensures optimal mixing and temperature conditions for ozone and hydrogen peroxide, maximizing their utilization and enhancing photocatalytic reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an integrated device combining ozone, ultraviolet radiation and hydrogen peroxide is used for advanced oxidation, then the treatment effect is improved, but the residence time of ozone in the reactor becomes short and the utilization rate of ozone becomes low
Solution Approach 1:
The patent divides the treatment system into separate functional units: a liquid-liquid mixing unit for hydrogen peroxide and wastewater, a preheating unit, a gas-liquid mixing unit for ozone injection, and a photocatalytic reactor. This segmentation allows each component to perform its function optimally, extending ozone residence time and improving utilization rate while maintaining treatment effectiveness.
2Reliability
If an integrated device combining ozone, ultraviolet radiation and hydrogen peroxide is used for advanced oxidation, then the treatment effect is improved, but the mixing of hydrogen peroxide, wastewater and ozone becomes uneven
Solution Approach 1:
The patent implements separate mixing stages: first a liquid-liquid mixing unit for homogeneous mixing of hydrogen peroxide and wastewater, then a preheating unit, followed by a gas-liquid mixing unit for ozone injection. This segmented approach ensures each mixing stage optimizes for its specific phase combination, achieving uniform overall mixing that enhances reaction efficiency.
Solution Approach 2:
The patent performs preliminary mixing of hydrogen peroxide and wastewater in the liquid-liquid mixing unit before introducing ozone. This preliminary action ensures the liquid phase is homogenized and preheated, creating optimal conditions for subsequent ozone dissolution and reaction, thereby improving overall mixing uniformity.
3Device complexity
If the concentration of ozone in effluent is high, then the treatment process is simpler, but additional energy is needed to decompose ozone and treatment cost increases
Solution Approach 1:
The patent segments the treatment process into distinct stages with separate mixing and reaction zones. This allows for controlled ozone injection and extended residence time, ensuring more complete ozone utilization and lower effluent concentration without requiring additional decomposition equipment, thus maintaining process simplicity while reducing energy consumption.
Solution Approach 2:
The patent employs a preheating unit to raise the temperature of the liquid-liquid mixture before ozone injection. This parameter change (temperature increase) accelerates ozone dissolution and decomposition kinetics, improving ozone utilization efficiency and reducing the concentration of ozone in effluent, thereby avoiding additional energy-consuming decomposition steps.
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 solution significantly increases ozone and hydrogen peroxide utilization rates, reduces treatment costs, and improves wastewater treatment efficiency by optimizing reaction conditions and residence times, achieving ozone utilization efficiencies above 80% and enhanced COD degradation.
Implementation Method 1
the preheating unit is used for preheating a mixed solution of the to-be-treated wastewater and the hydrogen peroxide
Implementation Method 2
the parallel photocatalytic reactor group is internally provided with several photocatalytic reactors, and an ultraviolet lamp is arranged in the photocatalytic reactor
Implementation Method 3
the system temperature is in the range when the ozone quickly generates the free radicals
Data Source
AI summary
The present disclosure discloses a multi-stage apparatus and process for advanced oxidation treatment of wastewater, and belongs to the field of wastewater treatment in environmental protection. The apparatus includes a liquid-liquid mixing unit, a preheating unit, a gas-liquid mixing unit, a parallel photocatalytic reactor group and an oxidation tower connected in sequence. According to characteristics of free radical reactions, the parallel photocatalytic reactor group and the oxidation tower in the apparatus are reasonably designed, utilization rates of the ozone and the hydrogen peroxide are increased, and the wastewater treatment cost is reduced.