Direct Reduced Iron Pellet Electrolysis for Sulfide Removal
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Solution Overview
Problem
Existing methods for reducing hydrogen sulfide from surface waters often involve adding unwanted chemicals and are not economically or technically viable.
Innovation Solution
The use of Direct Reduced Iron (DRI) pellets as electrodes in an electrolytic system to generate iron cations that react with hydrogen sulfide, precipitating iron sulfide and producing hydrogen gas, without the need for additional chemicals or modifications to the water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional chemical methods are used to reduce hydrogen sulfide, then hydrogen sulfide removal is achieved, but unwanted chemicals are added to the water
Solution Approach 1:
The patent converts the harmful hydrogen sulfide into beneficial iron sulfide precipitate and hydrogen gas by using iron cations generated through electrolysis. The hydrogen sulfide reacts with iron cations to form insoluble iron sulfide, effectively removing it from water while producing useful byproducts rather than adding unwanted chemicals.
Solution Approach 2:
The system uses the water itself as the electrolyte, eliminating the need to add external chemicals. The natural conductivity of the water allows the electrolytic process to proceed using only electrical energy, and the iron cations are generated in-situ from the electrodes, making the system self-sufficient without requiring additional chemical additives.
2Object-affected harmful factors
If existing reduction methods are used, then hydrogen sulfide is removed, but the methods are not economically viable
Solution Approach 1:
The patent employs inexpensive DRI pellets as electrodes that can be easily replaced. These pellets are low-cost iron-based materials that do not require complex fabrication, and their simplicity and affordability make the overall system economically viable for continuous operation, especially when compared to expensive traditional chemical treatment systems.
Solution Approach 2:
The patent extracts and utilizes the iron content from DRI pellets to generate iron cations for sulfide removal. By extracting the iron from the pellets and using it in the electrochemical reaction, the system converts a waste product (DRI pellets) into a useful resource, eliminating the need for expensive chemical reagents and improving economic viability.
3Object-affected harmful factors
If existing reduction methods are used, then hydrogen sulfide is removed, but the methods are not technically viable
Solution Approach 1:
The patent replaces traditional chemical treatment mechanisms with an electrochemical system. Instead of adding chemicals that require dosing, mixing, and precipitation control, the system uses electrical energy to directly generate iron cations at electrodes, which then react with hydrogen sulfide. This substitution of mechanical/chemical processes with electrical processes improves technical reliability and operational simplicity.
4Productivity
If DRI pellets are used as electrodes, then reaction efficiency is enhanced, but the system requires electrical energy input
Solution Approach 1:
The patent changes the physical state of iron from solid metal (DRI pellets) to dissolved iron cations through electrolysis. This parameter change enables the iron to react rapidly with hydrogen sulfide in solution, significantly enhancing reaction efficiency. The electrical energy input drives this transformation and facilitates the subsequent precipitation reaction, making the system highly productive.
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 removes hydrogen sulfide from surface waters, producing a usable byproduct (iron sulfide) and hydrogen gas, while being cost-effective and environmentally friendly, as DRI pellets are low-cost and do not require fabrication, with high surface area and porosity enhancing the reaction efficiency.
Implementation Method 1
The use of Direct Reduced Iron (DRI) pellets as electrodes in an electrolytic system to generate iron cations
Implementation Method 2
iron cations that react with hydrogen sulfide, precipitating iron sulfide
Data Source
AI summary
Devices, systems, and methods for removing hydrogen sulfide from surface water are described herein. One electrode device includes a vessel permeable to water, and a plurality of direct reduced iron (DRI) pellets in contact with one another and contained within the vessel.