Biodegradable Filter Cartridge for Microalgae Separation
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Solution Overview
Problem
Current methods for solid-liquid separation of microalgae suspensions, such as filtration and centrifugation, require high energy and costly equipment, and subsequent processing steps like enzymatic digestion also consume significant resources, leading to high operational costs.
Innovation Solution
A method using a self-consumable filter with a biodegradable filter layer made of organic materials like green waste or wood chips, where microalgae are hydrolyzed by naturally occurring or added microorganisms, allowing for efficient separation and release of valuable substances without the need for expensive enzymes or energy-intensive processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filtration or centrifugation is used for solid-liquid separation, then separation efficiency is improved, but energy consumption and operational costs increase
Solution Approach 1:
The patent employs disposable filter cartridges made of inexpensive, biodegradable materials (cellulose, cotton, paper) that are replaced after each use rather than cleaned and reused. This eliminates the need for complex cleaning systems and reduces operational costs, directly addressing the contradiction by using cheap, single-use filters instead of expensive, energy-intensive conventional separation methods
Solution Approach 2:
The filter cartridges are pre-inoculated with microorganisms that automatically digest the captured microalgae biomass during the filtration process itself. This self-digestion eliminates the need for separate, energy-intensive enzymatic treatment steps, allowing the filter to serve both separation and biomass breakdown functions simultaneously
2Ease of manufacture
If enzymatic or mechanical digestion is used to break down microalgae cell membranes, then ingredient accessibility is improved, but resource consumption and costs increase
Solution Approach 1:
The filter cartridge automatically performs digestion of microalgae biomass using microorganisms that are already present on the filter material or added during manufacturing. This self-digestion process occurs during the normal filtration operation without requiring separate enzymatic treatment steps, thereby reducing resource consumption while maintaining ingredient accessibility
Solution Approach 2:
The patent combines the filtration function and the digestion function into a single integrated filter cartridge system. The microalgae are captured on the filter surface during separation, and the same microorganisms on the filter then digest the captured biomass, merging two previously separate processes into one efficient operation
3Manufacturing precision
If filter paper or filter fleece is used for filtration, then separation is achieved, but disposal costs and environmental impact increase
Solution Approach 1:
Instead of discarding the filter cartridge as waste, the system recovers value by using the captured microalgae biomass as substrate for biogas production or animal feed. The filter cartridge itself is biodegradable and can be composted, transforming a disposal problem into a resource recovery opportunity that eliminates harmful environmental factors
Solution Approach 2:
The use of inexpensive, biodegradable materials (cellulose, cotton, paper) for the filter cartridge allows for easy disposal through composting or incineration without significant environmental impact. These materials naturally decompose without leaving persistent pollutants, addressing the environmental concern while maintaining separation capability
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 significantly reduces costs by over 50% and enables an integrated material cycle for microalgae processing, allowing for economical extraction and energy utilization of microalgae biomass, making industrial-scale microalgae technology viable for low and medium-priced products.
Implementation Method 1
The solid components of the suspension comprise microalgae, with the filter material and the microalgae subsequently being hydrolyzed by microorganisms which are naturally contained in the filter material or are added separately
Implementation Method 2
a filter layer made of biodegradable material is introduced into a filter device... the filter material and the microalgae subsequently being hydrolyzed by microorganisms
Implementation Method 3
at least one addition of the suspension to be separated takes place on the filter layer, the solid components of the suspension being deposited on the filter layer and the liquid component passing through the filter layer as filtrate
Data Source
Figure 1
AI summary
The invention relates to a method for the solid/liquid separation of suspensions containing microalgae, wherein biodegradable materials are used as a filter material. The method comprises the following steps: First, a filter layer made of organic material is introduced into a filter device. Then at least one application of the suspension to be separated to the filter layer is performed, wherein the solid constituents of the suspension are deposited on the filter layer and the liquid constituent passes through the filter layer as filtrate. The solid constituents of the suspension comprise microalgae, wherein subsequently the filter material and the microalgae are hydrolyzed by microorganisms naturally contained in the filter material or added separately. For the hydrolysis, it is important that the filter layer be kept moist in order to prevent the microalgae from drying out. In addition, valuable substances (dyes, lipids, proteins) can be extracted from the filtrate. The filtrate can also be used to produce biogas in a methane reactor. The filter material that is not biodegradable or is difficult to biodegrade can be used as organic compost. The waste liquor from the methane reactor can be used again for microalgae cultivation after decontamination.