Peroxyacetic Acid Wastewater Treatment for Sulfide Gas Control
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Solution Overview
Problem
The food processing industry faces challenges in managing malodorous sulfide gases, such as hydrogen sulfide, which are hazardous, corrosive, and can anesthetize the sense of smell, particularly in wastewater from industries like sugar cane and sugar beet processing, where they are produced during wastewater treatment due to anaerobic conditions caused by sulfur-reducing prokaryotes, leading to complex, costly, and unreliable prior art solutions.
Innovation Solution
A method involving the continuous addition of a peroxy acid composition, specifically peroxyacetic acid (PAA), to wastewater treatment systems to suppress sulfide gas release by targeting sulfur-reducing prokaryotes without significantly reducing aerobic microorganisms, using Fenton's Reagent in response to nutrient surges, and detecting changes in fluorescence to optimize dosage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sulfate oxidation is used to treat wastewater, then sulfide gases are produced, but odor control becomes difficult and hazardous
Solution Approach 1:
The patent converts the harmful sulfide gases produced by sulfate-oxidizing microorganisms into beneficial sulfuric acid through further oxidation. The system uses additional microorganisms or chemical oxidants to transform H2S into H2SO4, which can then be neutralized with lime to produce gypsum, turning a hazardous byproduct into a useful product.
Solution Approach 2:
The patent employs strong oxidants such as hydrogen peroxide, ozone, or advanced oxidation processes to accelerate the oxidation of sulfide gases to sulfuric acid. This rapid oxidation prevents sulfide gas accumulation and enables efficient conversion to less harmful substances.
2Productivity
If microorganisms are used to break down organic material, then waste processing occurs, but sulfide gases are produced under anaerobic conditions
Solution Approach 1:
The patent changes the oxidation-reduction potential (ORP) parameter of the wastewater system by introducing strong oxidants. This parameter change shifts the environment from anaerobic to aerobic conditions, preventing sulfate-reducing microorganisms from producing sulfide gases while maintaining organic material degradation through aerobic microorganisms.
Solution Approach 2:
The patent creates a composite microbial system that includes both organic-degrading microorganisms and sulfide-oxidizing microorganisms. This composite system simultaneously performs waste breakdown and prevents sulfide gas accumulation, or combines biological treatment with chemical oxidants for enhanced performance.
3Object-generated harmful factors
If sulfur-reducing prokaryotes proliferate, then sulfate oxidation increases, but dissolved oxygen is depleted
Solution Approach 1:
The patent implements a feedback control system that monitors dissolved oxygen levels and sulfide gas production in real-time. When sulfide levels rise or oxygen drops, the system automatically adjusts the dosage of oxidants or aeration rates to maintain optimal conditions, preventing both sulfide accumulation and oxygen depletion.
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
Effectively reduces sulfide gas release while preserving the vitality of waste-consuming aerobic microorganisms, maintaining microbial populations and reducing oxygen demand, with PAA dosages that are more than 10% effective than quaternary ammonium odor suppressants and minimizing corrosion.
Implementation Method 1
the addition of a composition containing at least one peroxy acid in an amount sufficient to reduce the release of sulfide gas
Implementation Method 2
adding an effective amount of Fenton's Reagent to the flow
Implementation Method 3
detecting a sudden surge in nutrient content in the process flow of water
Data Source
AI summary
The invention provides methods and compositions for reducing the malodorous sulfide gas released by a wastewater treatment system. The method preserves the vitality of waste consuming organisms within the system. The method comprises the steps of: determining the SRP PAA demand of the system, determining the aerobic PAA demand of the system, and adding a composition in an amount such that it is in excess of the SRP PAA demand but is below the aerobic PAA demand. Even though the composition increases the amount of sulfates within the wastewater it reduces the amount of SRP which prevents the malodorous sulfite gas release. The composition comprises at least one percarboxyacid.