Direct Reduced Iron Pellets for Hydrogen 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, which are porous and highly conductive, to adsorb hydrogen sulfide from water, forming iron sulfide and capturing hydrogen for potential reuse, integrated into a system with a bioreactor to efficiently remove hydrogen sulfide without adding chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical additives are used to reduce hydrogen sulfide from surface waters, then hydrogen sulfide removal effectiveness is improved, but environmental harm and operational complexity increase
Solution Approach 1:
The patent extracts and removes the harmful chemical additives from the treatment process entirely. Instead of adding chemicals to react with hydrogen sulfide, the system uses a bioreactor with sulfate-reducing bacteria that naturally consume sulfate and produce hydrogen sulfide, which is then captured by an iron-based media. This extraction of harmful substances resolves the contradiction by achieving removal effectiveness without environmental harm.
Solution Approach 2:
The patent introduces an intermediary bioreactor system between the source of hydrogen sulfide and the treatment process. The bioreactor uses sulfate-reducing bacteria as biological mediators to convert sulfate to hydrogen sulfide, which is then captured by iron media. This intermediary biological process replaces direct chemical addition, maintaining effectiveness while eliminating harmful chemical additives.
2Reliability
If conventional hydrogen sulfide treatment methods are used, then removal capability is improved, but economic viability deteriorates
Solution Approach 1:
The patent applies discarding and recovering by capturing hydrogen sulfide with iron media to form iron sulfide precipitate, which can be removed and potentially reused or disposed of valueably. The system discards the harmful hydrogen sulfide while recovering it in a manageable form, and the iron media can be regenerated or replaced economically. This resolves the economic viability issue by creating a sustainable material cycle rather than expensive chemical consumption.
Solution Approach 2:
The bioreactor system is self-service in that sulfate-reducing bacteria naturally perform the sulfate-to-hydrogen sulfide conversion without external chemical inputs. The system uses naturally occurring biological processes and readily available iron-based materials, eliminating the need for continuous purchase and application of expensive treatment chemicals, thereby improving economic viability.
3Reliability
If existing hydrogen sulfide reduction approaches are implemented, then sulfide removal is improved, but system complexity and operational difficulty increase
Solution Approach 1:
The patent segments the treatment system into distinct functional modules: a bioreactor compartment for biological sulfate reduction and a separate treatment compartment with iron media for hydrogen sulfide capture. This segmentation allows each component to be optimized independently and simplifies operation, as operators can monitor and maintain each module separately rather than managing a complex integrated chemical dosing system.
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, rendering the water safe for aquatic environments and providing a valuable byproduct of iron sulfide, while being economically viable and environmentally friendly.
Implementation Method 1
The use of Direct Reduced Iron (DRI) pellets, which are porous and highly conductive, to adsorb hydrogen sulfide from water, forming iron sulfide
Implementation Method 2
Direct Reduced Iron (DRI) pellets, which are porous and highly conductive
Data Source
AI summary
The present disclosure relates to apparatuses, systems, and methods for removing hydrogen sulfide from surface water. One apparatus includes a vessel having an inlet, an outlet, and a closure, and a plurality of direct reduced iron (DRI) pellets contained within the vessel.