Metal Catalyst for Ammonia Conversion in Wet Air Oxidation
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Solution Overview
Problem
Conventional methods for treating spent caustic solutions containing organic nitrogen compounds with wet air oxidation are complex, as they result in ammonia being discharged as off-gas and liquid effluent, requiring additional scrubbing and biological treatment, which can overwhelm conventional treatment systems.
Innovation Solution
A system and method utilizing a wet air oxidation unit with a metal-based catalyst in a catalytic zone to convert ammonia from organic nitrogen compounds to nitrogen gas, reducing ammonia levels in off-gas and liquid effluent, and incorporating ammonia sensors for monitoring and catalyst regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional wet air oxidation methods are used to treat spent caustic containing organic nitrogen compounds, then oxidation of organic compounds is achieved, but ammonia is discharged as off-gas and liquid effluent requiring additional scrubbing and biological treatment
Solution Approach 1:
The patent converts the harmful ammonia byproduct into beneficial nitrogen gas through a catalytic oxidation reaction. The catalyst promotes the oxidation of ammonia to nitrogen gas and water, transforming a harmful substance that requires complex treatment into a harmless gas that can be safely discharged, thereby eliminating the need for additional scrubbing and biological treatment systems
Solution Approach 2:
The patent changes the chemical reaction parameters by introducing a catalyst that alters the oxidation pathway. Instead of conventional oxidation that produces ammonia, the catalytic oxidation process changes the reaction parameters to produce nitrogen gas directly, fundamentally changing the output composition and eliminating the need for downstream ammonia treatment facilities
2Quantity of substance
If additional scrubbing and biological treatment operations are added to handle ammonia discharge, then ammonia removal is improved, but treatment system complexity and operational burden increase
Solution Approach 1:
The patent extracts and eliminates the need for separate ammonia treatment operations by integrating the ammonia oxidation function into the main treatment process. The catalyst performs the ammonia-to-nitrogen conversion within the existing wet air oxidation system, removing the requirement for additional scrubbing columns, biological reactors, and associated infrastructure
Solution Approach 2:
The patent merges the oxidation of organic nitrogen compounds and the oxidation of ammonia into a single integrated process. Both reactions occur simultaneously in the presence of the catalyst, combining multiple treatment functions into one unified system that eliminates the need for separate treatment stages
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 approach significantly reduces ammonia in the off-gas and liquid effluent, simplifying post-treatment requirements and enabling safe discharge of nitrogen-rich gases and biological treatment of nitrogen-depleted effluents, thus addressing the complexity of conventional treatment methods.
Implementation Method 1
a metal-based catalyst configured to catalyze a conversion reaction of ammonia to nitrogen, positioned within the catalytic zone
Implementation Method 2
contacting the wastewater with an oxidant to oxidize a target percentage of the organic nitrogen compounds and produce a mixed liquor comprising ammonia
Data Source
AI summary
Systems for treating wastewater containing organic nitrogen compounds are disclosed. The systems include a wet air oxidation unit having an oxidation zone, a catalytic zone, and a metal-based catalyst. Methods of treating wastewater containing organic nitrogen compounds are also disclosed. The methods include contacting the wastewater with an oxidant to produce a mixed liquor, contacting the mixed liquor with a metal-based catalyst to catalyze ammonia and produce a gas containing nitrogen and a liquid effluent containing nitrogen. Methods of retrofitting a wet air oxidation unit including providing a metal-based catalyst are also disclosed. Methods of facilitating treatment of wastewater in a wet air oxidation unit including providing a metal-based catalyst are also disclosed.