Automated Permeability Test for Bioreactor Filter Basket
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Solution Overview
Problem
Bioreactors face challenges in maintaining efficient filtration due to the buildup of impermeable filter cakes in filter baskets, which leads to clogging, and existing systems lack reliable methods for determining the need for cleaning and assessing contamination levels, especially in closed systems like those on vehicles, where access to internal data is limited.
Innovation Solution
An automated method and device that determine the permeability of the filter basket using a suction unit, liquid metering unit, and measuring unit, controlled by an electronic control unit, to assess the need for cleaning and perform mechanical or chemical cleaning processes based on predetermined thresholds, allowing for efficient and automated maintenance without direct access to internal data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the filter basket operates continuously without cleaning, then productivity is improved, but the filter cake becomes increasingly thick and impermeable causing clogging and reducing filtration efficiency
Solution Approach 1:
The system uses a suction unit to continuously monitor permeability by measuring the volume of liquid suctioned through the filter basket over a predetermined time period. This feedback mechanism automatically detects when the filter cake reduces permeability below a threshold, triggering a cleaning cycle without manual intervention or system shutdown
Solution Approach 2:
The system performs self-diagnosis and self-maintenance by automatically detecting filter cake buildup through permeability measurements and initiating cleaning cycles. The electronic control unit coordinates the suction unit, metering unit, and cleaning mechanisms to maintain optimal filtration efficiency without external monitoring
2Reliability
If the filter cake is removed early to prevent clogging, then reliability is improved, but inefficient filtration occurs and productivity is reduced
Solution Approach 1:
The suction unit continuously monitors permeability and only triggers cleaning when the measured liquid volume falls below a predetermined threshold, indicating actual clogging. This prevents premature cleaning while ensuring timely intervention when filtration efficiency genuinely deteriorates
Solution Approach 2:
The system dynamically adjusts the cleaning schedule based on real-time permeability measurements rather than following a fixed time-based schedule. The cleaning frequency adapts to the actual accumulation rate of the filter cake, optimizing the balance between maintaining filtration efficiency and maximizing productive operation time
3Ease of operation
If manual checking of filter cake amount is performed, then some assessment of contamination is possible, but the check is random and cannot reliably determine the correct time for removal
Solution Approach 1:
The system replaces manual visual inspection with an automated suction-based measurement system. The suction unit quantitatively measures permeability by recording the volume of liquid suctioned over a predetermined time, providing objective and precise data on filter cake contamination levels without human subjectivity or random sampling errors
Solution Approach 2:
The suction unit acts as an intermediary measurement tool that indirectly assesses filter cake contamination by measuring its effect on liquid flow through the filter basket. This provides a reliable proxy measurement of permeability that correlates with contamination level without requiring direct observation or disassembly of the filter basket
4Device complexity
If the bioreactor is constructed as a closed system for compactness, then device complexity is reduced, but access to internal data and information required for maintenance assessment is not possible
Solution Approach 1:
The closed bioreactor system performs self-diagnosis by incorporating a suction unit and electronic control unit that automatically monitor permeability internally. The system generates and processes its own diagnostic data without requiring external access, enabling decentralized maintenance decisions while maintaining system compactness
Solution Approach 2:
The suction unit serves multiple functions: it operates as part of the normal filtration system during operation and as a diagnostic measurement tool during permeability testing. This multi-functionality eliminates the need for separate access points or additional equipment, maintaining system compactness while enabling comprehensive monitoring
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 solution enables efficient and reliable cleaning of filter baskets, reducing personnel effort and human error, ensuring consistent filtration efficiency and extending maintenance cycles, particularly in compact and inaccessible bioreactor systems.
Implementation Method 1
controlling a suction unit by means of an electronic control unit to remove liquid from the liquid tank through the drain line
Implementation Method 2
the filter basket has filter elements on the walls, such as the bottom and side walls, through which liquid elements can flow off and through which solid elements are collected
Implementation Method 3
the solid elements in the filter basket settle as a filter cake
Data Source
AI summary
A method for automated cleaning of a filter basket in a bioreactor includes determining permeability of the filter basket. A control unit controls a suction unit for suctioning a residual liquid from the liquid tank, a liquid metering unit for dispensing a liquid having a predetermined liquid volume into the filter basket controls the suction unit to empty the liquid tank by suctioning a filtered liquid volume, measures the volume of the suctioned liquid volume, and sending a first measurement signal to the control unit. The control unit determines a permeability quotient from the volume of the extracted filtered liquid volume to the volume of the dispensed predetermined liquid volume and compares the permeability quotient with a permeability threshold. The control unit then controls a cleaning unit to perform a cleaning process of the filter basket if the permeability quotient is below the permeability threshold.