Hydrogen Peroxide Removal System Using Dilution and Fenton Reaction
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Solution Overview
Problem
Industrial wastewater often contains high concentrations of hydrogen peroxide and organic contaminants, posing challenges for effective removal and compliance with tightening regulatory standards, as conventional methods like catalytic carbon treatment are ineffective at high concentrations and can lead to hazardous reactions.
Innovation Solution
A system involving dilution of wastewater to reduce hydrogen peroxide concentration, followed by a Fenton's reaction with ferrous salt and acid at acidic pH to break down contaminants, and subsequent pH adjustment to precipitate iron compounds, which are recycled and used to maintain the reaction's effectiveness, while catalytic activated carbon is used to further reduce residual hydrogen peroxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalytic carbon treatment is used on high concentration hydrogen peroxide wastewater, then hydrogen peroxide removal is attempted, but hazardous reactions occur and treatment effectiveness is lost
Solution Approach 1:
The system performs preliminary dilution of the wastewater to reduce hydrogen peroxide concentration to below 2.2 wt% before introducing it to the reaction tank. This preliminary action prevents hazardous reactions from occurring in the first place, making the subsequent catalytic carbon treatment safe and effective.
Solution Approach 2:
The system changes the concentration parameter of hydrogen peroxide in the wastewater from high levels (above 2.2 wt%) to low levels (below 2.2 wt%) through dilution. This parameter change transforms the wastewater from a hazardous state that cannot be treated to a safe state that can be effectively treated by catalytic carbon.
2Reliability
If Fenton's reaction is used to treat wastewater, then hydrogen peroxide and organic contaminants are broken down, but iron-containing compounds are generated as waste
Solution Approach 1:
The system recovers iron-containing compounds from the second reaction tank and recycles them back to the first reaction tank as a source of dissolved iron compound. This eliminates waste disposal and reduces the need for fresh ferrous salt addition, while maintaining the effectiveness of contaminant removal.
Solution Approach 2:
The system makes the iron-containing compounds serve a dual purpose: they are products of the Fenton's reaction and simultaneously become the reagent for the next treatment cycle. The precipitated iron compounds essentially serve themselves by being recycled back into the system where they dissolve and participate in further contaminant degradation.
3Reliability
If wastewater is diluted to enable effective treatment, then treatment safety and effectiveness are improved, but treatment system complexity increases
Solution Approach 1:
The system merges the dilution function with the treatment process by using treated water from the system itself as the dilution medium. This integration eliminates the need for separate dilution water sources and simplifies the overall system architecture while maintaining safety through dilution.
Solution Approach 2:
The treated water serves multiple functions: it is the final effluent that meets discharge standards, and simultaneously it serves as the dilution medium for incoming high-concentration wastewater. This multi-functionality reduces system complexity by eliminating dedicated dilution water requirements.
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
This method significantly reduces hydrogen peroxide and organic contaminant levels, achieving concentrations below regulatory limits, with the system's control mechanisms ensuring efficient operation and minimizing chemical usage and waste generation.
Implementation Method 1
contacting the diluted wastewater with a dissolved iron compound at an acidic pH to form a partially treated wastewater having a lower concentration of hydrogen peroxide than the diluted wastewater
Implementation Method 2
precipitating iron-containing compounds from the partially treated wastewater by raising a pH of the partially treated wastewater to form a neutralized partially treated wastewater
Implementation Method 3
removing residual hydrogen peroxide from the partially treated wastewater by treating the partially treated wastewater with catalytic activated carbon
Data Source
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AI summary
A system (100) for removing hydrogen peroxide from wastewater, the system comprising: a first reaction tank (135) having an inlet fluidly connectable to a source of the wastewater; a source of dilution water (105) having a lower concentration of hydrogen peroxide than the wastewater in fluid communication with the inlet of the first reaction tank; a source of ferrous salt in fluid communication with the first reaction tank (140); a source of acid in fluid communication with the first reaction tank (145); a second reaction tank (150) having an inlet in fluid communication with an outlet of the first reaction tank; and a source of a base in fluid communication with the second reaction tank (155).