Keratin Hydrolysate Binder for Lignin-Inhibited Biomass Fermentation
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Solution Overview
Problem
The inefficiency of enzymatic cellulose hydrolysis in lignocellulosic biomass due to lignin inhibition, leading to low sugar concentration and increased energy consumption in ethanol production, is addressed by using a hydrolysate of keratin-containing materials to enhance fermentation.
Innovation Solution
A method involving the use of a hydrolysate of keratin-containing materials, such as feathers or hair, to inhibit lignin during the fermentation of lignocellulosic biomass, thereby allowing higher concentrations of fermentation to occur with reduced energy input and minimizing the need for expensive pre-treatment steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If enzymatic hydrolysis is performed at higher fiber concentrations to increase sugar concentration, then productivity improves, but lignin inhibition increases and reduces enzymatic activity
Solution Approach 1:
The patent introduces a lignin-binding agent as an intermediary substance that mediates between lignin and enzymes. This agent selectively binds to lignin, preventing it from inhibiting enzymatic activity while allowing the process to run at higher fiber concentrations. The binder acts as a bridge that removes the harmful interaction between lignin and enzymes.
Solution Approach 2:
The patent converts the harmful effect of lignin inhibition into a beneficial outcome by using the lignin-binding agent to sequester lignin. Instead of trying to eliminate lignin entirely, the process harnesses the binding agent to capture lignin's inhibitory effect, thereby protecting enzymatic activity while maintaining high productivity.
2Productivity
If pre-treatment steps are used to remove lignin before fermentation, then enzymatic hydrolysis efficiency improves, but capital and operating costs increase
Solution Approach 1:
The patent applies preliminary action by adding the lignin-binding agent before or during the enzymatic hydrolysis step, rather than performing extensive pre-treatment to remove lignin. This preliminary binding of lignin prevents inhibition during hydrolysis, achieving high efficiency without the need for costly pre-treatment infrastructure.
Solution Approach 2:
The lignin-binding agent serves as a relatively inexpensive, consumable substance that can be added in controlled amounts. Rather than investing in expensive pre-treatment equipment and processes, the patent uses a cost-effective chemical additive that performs the lignin removal function temporarily during the hydrolysis process.
3Reliability
If low fiber concentration is used during hydrolysis to ensure good enzyme contact, then enzymatic activity is maintained, but fermentation vessel size and energy input increase
Solution Approach 1:
The lignin-binding agent acts as an intermediary that enables high fiber concentration processing by preventing lignin-enzyme interactions. This allows the system to operate at higher solid contents without sacrificing enzymatic activity, thereby reducing the volume of fermentation vessels needed and lowering energy input for subsequent purification steps.
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 fermentation product yield and reduces energy consumption by preventing lignin inhibition, allowing for higher concentrations of lignocellulosic biomass fermentation with improved efficiency and reduced capital and operating costs.
Implementation Method 1
The cellulose surface is full. Nearly a quarter of the total cellulose surface is consistently covered by lignin, significantly reducing the area accessible to the enzymes.
Implementation Method 2
In EH, a family of enzymes can be used that work together to hydrolyze glycosidic bonds in polymeric lignocellulose molecules.
Implementation Method 3
Both bioethanol and biodiesel are mainly produced from biomass.
Data Source
AI summary
Method for preparing a fermentation product from a fermentable mixture comprising the steps of: (i) bringing the fermentable mixture, comprising lignocellulosic biomass. into contact with microorganisms, enzymes, or a combination thereof; (ii) allowing at least part of the fermentable mixture to be processed by the microorganisms, the enzymes, or the combination thereof, whereby the fermentation product is obtained; (iii) purifying the fermentation product, wherein the fermentable mixture comprises a keratin-containing material, a hydrolysate of a keratin-containing material, or a mixture thereof, in an amount of between 0.01 and 15 m %, expressed in total amount of keratin-containing material and hydrolysate of keratin-containing material in g per g of fermentable mixture. The invention also relates to the use of a keratin-containing material, a hydrolysate of keratin-containing material, or a combination thereof for the fermentation of a fermentable mixture, comprising lignocellulose, to bioethanol.