Sweet Sorghum Hydrogen Production Through Dark-Light Fermentation
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Solution Overview
Problem
Existing methods for producing hydrogen gas from biomass, such as sweet sorghum, face challenges in efficiency, cost, and optimization of fermentation conditions, particularly in combining dark and light fermentation processes, and there is a need for a sustainable and efficient method that can be scaled industrially.
Innovation Solution
A method involving the preparation of specific microbial strains and enzyme treatments of sweet sorghum stalk juice and seed powder, followed by controlled dark and light fermentation, and subsequent purification, to produce hydrogen gas with over 99% purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water electrolysis is used for hydrogen production, then hydrogen gas can be produced, but a large amount of electrical energy is required
Solution Approach 1:
The invention changes the fundamental production method from electrochemical (water electrolysis) to biochemical (fermentation), altering the energy input type from electrical to thermal/biological, thereby reducing electrical energy requirements while maintaining hydrogen production capability
Solution Approach 2:
The invention replaces the mechanical/electrical electrolysis system with a biological fermentation system using microorganisms to convert sugar into hydrogen, substituting a complex energy-intensive process with a more efficient biological pathway
2Productivity
If only dark fermentation or only light fermentation is used, then the process is simpler, but hydrogen production efficiency is lower
Solution Approach 1:
The invention merges dark fermentation and light fermentation into a single integrated process, where dark fermentation converts sugar to hydrogen and light fermentation further processes intermediates to produce additional hydrogen, achieving synergistic effects that improve overall productivity while managing complexity through process integration
Solution Approach 2:
The invention implements continuous hydrogen production by sequentially operating dark and light fermentation stages, ensuring that useful action (hydrogen generation) continues without interruption throughout the process, maximizing productivity through uninterrupted biochemical conversion
3Ease of manufacture
If multiple separate processes are used for gelatinization, liquefaction, and saccharification, then each process can be optimized, but the overall system becomes more complex and costly
Solution Approach 1:
The invention combines gelatinization, liquefaction, and saccharification into a single integrated fermentation process using pretreated sweet sorghum substrate, eliminating the need for separate processing stages while maintaining effective conversion of starch to fermentable sugars for hydrogen production
Solution Approach 2:
The invention creates a multi-functional fermentation system where a single process performs multiple functions (gelatinization, liquefaction, saccharification, and fermentation) through the combined action of pretreatment and microbial metabolism, reducing system complexity while preserving productivity
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
The method achieves high hydrogen gas recovery efficiency, reduces production costs, and ensures environmental sustainability by integrating gelatinization, liquefaction, and saccharification processes in a single system, suitable for industrial application.
Implementation Method 1
mixing the sweet sorghum stalk juice ingredient with the sweet sorghum seed powder ingredient... mixing the alpha-amylase enzyme ingredient with the first temporary mixture... mixing the glucoamylase enzyme ingredient with the second temporary mixture
Implementation Method 2
fermenting the first base mixture under dark conditions to produce a first hydrogen gas... dark fermentation microorganism ingredient... fermenting the first base mixture under dark conditions at a temperature of 25° C.-30° C. for 22-26 hours to produce a first hydrogen gas
Implementation Method 3
fermenting the second base mixture under light conditions to produce a second hydrogen gas... light fermentation microorganism ingredient... fermenting the second base mixture under light conditions at a light intensity of 1500-2000 lux, a temperature of 25° C.-30° C., a stirring speed of 200-300 rpm, and for a duration of 22-26 hours to produce a second hydrogen gas
Data Source
AI summary
A method for producing hydrogen gas (H2) from sweet sorghum (Sorghum bicolor (L.) Moench) comprising: (i) preparing materials; (ii) creating a first temporary mixture; (iii) creating a second temporary mixture; (iv) creating a third temporary mixture; (v) creating a first base mixture; (vi) fermenting the first base mixture under dark conditions to produce a first hydrogen gas and a dark fermented base mixture; (vii) creating a second base mixture; (viii) fermenting the second base mixture under light conditions to produce a second hydrogen gas; and (ix) purifying the first hydrogen gas and the second hydrogen gas to obtain a hydrogen gas purity of over 99%.