Bioreactor Hydrocyclone Separation with Dual-Pump Control
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Solution Overview
Problem
Existing bioreactor systems with hydrocyclones face inefficiencies due to high flow rates and sensitivity to feed rate fluctuations, making it difficult to operate effectively at low dilution rates and limiting the use of hydrocyclones in smaller bioreactors.
Innovation Solution
A circulation line with a second pump is introduced between the underflow and inflow of the hydrocyclone, allowing for independent pressure drop management and separate control of dilution rates, along with a second inlet for improved medium distribution and a filter for residual particle retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hydrocyclone is operated at high flow rates to achieve separation, then separation efficiency is improved, but overflow rate becomes too high causing excessive media and cell loss
Solution Approach 1:
The underflow is divided into two separate streams: one returned to the bioreactor and another fed back to the hydrocyclone inlet. This segmentation allows independent control of dilution rate and pressure drop, enabling operation at optimal separation conditions without excessive overflow rates
Solution Approach 2:
The system introduces dynamic control through two independently adjustable pumps, allowing the operation parameters to be continuously optimized. The first pump controls dilution rate while the second pump controls pressure drop, enabling adaptive operation to maintain high separation efficiency while minimizing substance loss
2Loss of substance
If the hydrocyclone is operated at low dilution rates to reduce media loss, then material costs are reduced, but separation performance deteriorates
Solution Approach 1:
By segmenting the underflow into two streams with independent control, the system decouples the relationship between dilution rate and pressure drop. This allows operation at low dilution rates while maintaining adequate pressure drop for effective separation through the second pump
Solution Approach 2:
The system independently adjusts two key parameters: dilution rate (via first pump) and pressure drop (via second pump). This dual-parameter control enables operation at low dilution rates to reduce media loss while maintaining separation performance through optimized pressure drop
3Productivity
If the hydrocyclone size is increased to handle larger bioreactors, then processing capacity is improved, but the system becomes impractical for smaller bioreactors
Solution Approach 1:
The dynamically controllable dual-pump system allows the hydrocyclone to be operated at optimized parameters regardless of bioreactor size. Smaller hydrocyclones can achieve effective separation by adjusting pressure drop and dilution rate independently, making the system scalable and adaptable across different bioreactor volumes
Solution Approach 2:
By independently controlling dilution rate and pressure drop, the system allows smaller hydrocyclones to achieve separation performance comparable to larger units. The parameter optimization compensates for size differences, enabling versatile application from small to large bioreactors
4Manufacturing precision
If the feed rate is increased to maintain separation at low dilution rates, then separation continues effectively, but feed rate fluctuations impair separation performance
Solution Approach 1:
The system establishes feedback control where the second pump adjusts pressure drop based on separation requirements. This feedback mechanism compensates for feed rate fluctuations, maintaining stable separation performance even when inlet conditions vary
Solution Approach 2:
The dynamically adjustable second pump provides real-time compensation for feed rate variations by modulating pressure drop. This dynamic response stabilizes the separation process against disturbances in feed rate, improving reliability
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 configuration enables high-efficiency operation of hydrocyclones at low dilution rates, reduces the impact of feed rate fluctuations, and allows for effective separation in smaller bioreactors, enhancing overall separation performance and reducing material costs.
Implementation Method 1
particle separation in a hydrocyclone
Implementation Method 2
The cell-containing solution or cell suspension is removed from the bioreactor and fed via a feed line to the inflow of the hydrocyclone, which divides the cell-containing solution into an overflow with few cells and an underflow enriched with cells
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The device (1) comprises an intermediate first pump (5), to which a bioreactor (2) is connected over a feed pipeline (4), a circulating conduit arranged with a second pump, and a control unit, over which the pumps are controllable. The bioreactor is connected with an underflow of a hydrocyclone (3) over a return pipeline. A particle-free solution is dischargeable over an overflow of the hydrocyclone. The intermediate first pump has an inlet (6) of the hydrocyclone. The circulating conduit is arranged between the underflow and the inlet of the hydrocyclone. The hydrocyclone has a filter. The device (1) comprises an intermediate first pump (5), to which a bioreactor (2) is connected over a feed pipeline (4), a circulating conduit arranged with a second pump, and a control unit, over which the pumps are controllable. The bioreactor is connected with an underflow of a hydrocyclone (3) over a return pipeline. A particle-free solution is dischargeable over an overflow of the hydrocyclone. The intermediate first pump has an inlet (6) of the hydrocyclone. The circulating conduit is arranged between the underflow and the inlet of the hydrocyclone. The hydrocyclone has a filter in the area of the overflow. The pressure drop of the hydrocyclone is determined via the second pump. The dilution rate of the bioreactor is determined via the first pump. A further inlet connected with the feed pipeline is arranged at the hydrocyclone. The bioreactor, the hydrocyclone, the pumps or its pump heads and/or the pipelines are formed as disposable parts.