UV Pretreatment for Hydrogen Production from Protein Wastewater
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Solution Overview
Problem
Biological production of hydrogen from protein-containing wastewater is hindered by slow protein degradation under anaerobic conditions, requiring inhibition of methanogenic and hydrogen-consuming bacteria, and existing methods for protein denaturation are inefficient and may cause secondary pollution.
Innovation Solution
The method involves UV light pretreatment of protein-containing wastewater to denature proteins, followed by anaerobic fermentation under neutral pH conditions using heat-treated anaerobic activated sludge and trace elements, enhancing protein conversion and hydrogen yield without residual pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If anaerobic fermentation is used to produce hydrogen from protein-containing wastewater, then hydrogen can be produced as a clean energy source, but protein degradation is slow and incomplete due to the rate-limiting hydrolysis process
Solution Approach 1:
The patent applies preliminary action by using UV irradiation to denature proteins before the anaerobic fermentation process. This pre-treatment unfolds the protein structure, making it more accessible to proteases and significantly accelerating the subsequent hydrolysis and degradation rates, thereby resolving the rate-limiting step without compromising hydrogen production efficiency
Solution Approach 2:
The patent changes the physical state and structure of proteins through UV irradiation, transforming them from native folded structures to denatured unfolded structures. This parameter change in protein conformation increases the surface area and accessibility of peptide bonds to enzymatic attack, thereby accelerating the degradation rate and improving overall productivity
2Productivity
If methanogenic bacteria activity is inhibited to obtain hydrogen as intermediate product, then hydrogen yield increases, but the fermentation process becomes more difficult to control and may lead to incomplete degradation
Solution Approach 1:
By applying UV pre-treatment before fermentation, the patent prepares the substrate in advance to be more readily degradable. This preliminary action ensures that when methanogenic bacteria are inhibited, the hydrolysis process proceeds efficiently without requiring precise control adjustments, thereby maintaining ease of operation while maximizing hydrogen yield
Solution Approach 2:
The patent segments the fermentation process into distinct stages: UV pre-treatment stage, acidification stage (hydrogen production), and controls the inhibition of methanation stage. This segmentation allows independent optimization of each stage, making the overall process easier to control and manage while maximizing hydrogen production
3Productivity
If existing protein denaturation methods are used, then protein structure can be altered, but these methods are inefficient and may cause secondary pollution
Solution Approach 1:
The patent replaces conventional mechanical or chemical denaturation methods with UV irradiation, a form of electromagnetic energy treatment. This substitution eliminates the need for harsh chemicals or extreme mechanical conditions that cause secondary pollution, while efficiently achieving protein denaturation and improving conversion rate to hydrogen
Solution Approach 2:
The patent converts the potential harmful effect of UV irradiation (which can be damaging at high doses) into a beneficial process by optimizing the irradiation parameters to achieve controlled denaturation without causing unwanted side effects or pollution. The UV energy that could be harmful is instead used productively to unfold proteins and enhance biodegradability
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 increases protein conversion rate and hydrogen yield by 2.79 times, reduces treatment costs, and minimizes equipment corrosion, while avoiding secondary pollution and acidic conditions.
Implementation Method 1
UV light, especially UV light-C, provides a kind of physical methods for protein denaturation. The natural structure of proteins can be damaged after absorption of UV light by tyrosine, tryptophan and phenylalanine in the proteins and protein unfolding may occur
Implementation Method 2
inoculate heat-treated anaerobic activated sludge
Implementation Method 3
the anaerobic reactor undergoes anaerobic fermentation for 72-96 hours in shaker under intermediate temperature condition
Implementation Method 4
Under anaerobic conditions, proteins can be firstly hydrolyzed into peptides and amino acids
Data Source
AI summary
Disclosed is a method for improving biological production of hydrogen from protein-containing wastewater comprising two stages: ultraviolet radiation pretreatment of protein-containing wastewater and biological production of hydrogen under a neutral pH condition and intermediate temperature condition.