Ethanol Stillage Particle Stabilization for Water Recycling
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Solution Overview
Problem
Conventional ethanol production processes face challenges in efficiently recycling and processing the remaining liquids and solids from fermentation, leading to increased costs and complexity due to limited recycling ratios and costly evaporation processes.
Innovation Solution
The method involves treating stillage with reducing agents and high molecular weight anionic polymers to form stable particles, which are then separated from the liquid portion, allowing for increased recycling of the treated liquid as backset and further processing of the solids into valuable products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thin stillage is recycled as backset into fermentation, then water usage efficiency is improved, but the ratio of recyclable thin stillage is limited due to accumulated solids and unfermentable components
Solution Approach 1:
The patent extracts suspended solids from thin stillage through filtration before recycling the clarified liquid as backset. This removes the harmful accumulation of solids while preserving the beneficial liquid portion for fermentation water replacement, thereby increasing the recyclable ratio without exceeding solids limits.
Solution Approach 2:
The patent segments thin stillage into two distinct streams: filtered solids (sent to evaporators or alternative processing) and clarified liquid (recycled as backset). This separation allows independent optimization of each stream, enabling higher recycling ratios while managing solids through dedicated processing pathways.
2Loss of substance
If thin stillage is sent to evaporation process to separate water from solids, then water recovery is improved, but operational costs and energy consumption increase significantly
Solution Approach 1:
The patent segments the stillage processing into two pathways: a low-energy filtration pathway for liquid recovery and a concentrated evaporation pathway for solids handling. By pre-filtering to remove bulk solids before evaporation, the remaining liquid requires less energy-intensive evaporation, reducing overall energy consumption while maintaining water recovery effectiveness.
Solution Approach 2:
The patent applies preliminary filtration to thin stillage before it enters the evaporation process. This preliminary removal of suspended solids reduces the load on evaporators, decreasing the energy required for subsequent water-solids separation and lowering operational costs.
3Productivity
If more evaporation capacity is installed to process all thin stillage, then water recovery capability is improved, but capital costs and plant complexity increase
Solution Approach 1:
The patent divides the stillage processing system into two parallel streams: a high-volume low-solids filtration stream for backset recycling and a low-volume high-solids stream for evaporation or alternative processing. This segmentation allows water recovery without requiring proportionally large evaporation capacity, reducing capital investment and system complexity.
Solution Approach 2:
The patent introduces filtration as an intermediary process between thin stillage and the evaporation system. This intermediary step pre-concentrates solids and clarifies liquid, enabling the evaporation system to operate at reduced capacity while maintaining overall water recovery effectiveness, thereby lowering capital costs.
4Manufacturing precision
If reducing agents and high molecular weight anionic polymers are added to stillage, then particle stability and separation efficiency are improved, but chemical costs increase
Solution Approach 1:
The patent optimizes the dosage and type of reducing agents and anionic polymers to achieve effective particle stabilization at minimum concentrations. By carefully controlling chemical parameters (dosage, pH, mixing conditions), the process achieves high separation efficiency while minimizing chemical consumption and costs.
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 effectively reduces the amount of material sent to evaporators, decreases operational and chemical costs, and potentially eliminates the need for evaporation processes, improving the overall efficiency and cost-effectiveness of ethanol production.
Implementation Method 1
A high molecular weight anionic polymer is added to form stable particles of one or more of the solids and suspended solids
Implementation Method 2
A reducing agent is added
Data Source
AI summary
Methods and systems for forming stable particles from suspended solids produced by ethanol fermentation are disclosed. The methods include providing a fraction from ethanol fermentation containing solids and suspended solids. The pH of the fraction is adjusted, if necessary. A reducing agent is added. A high molecular weight anionic polymer is added to form stable particles of solids and suspended solids. Lastly, the stable particles are free drained to separate them from a treated liquid portion. The treated liquid portion is added as backset to the fermentation process while the recovered solids are further processed into useful products.