External Separator for Granular Sludge Reactor
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Solution Overview
Problem
Conventional anaerobic sludge bed reactors face challenges with biomass retention and separation efficiency, particularly during low biogas production, leading to potential blockages and maintenance difficulties due to the lack of proper control over recirculation and accessibility issues with internal settlers.
Innovation Solution
An external separation chamber with tilted internals is used outside the bioreactor, where the aqueous fluid is separated into a liquid phase with reduced granular biomass content and a fluid phase enriched in granular biomass, which is then returned to the bioreactor using a biogas-driven flow, eliminating the need for a second settler inside the reactor and enhancing maintenance and start-up processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal three-phase separator device is used inside the reactor, then separation of biomass, water and biogas is achieved, but maintenance and accessibility become difficult
Solution Approach 1:
The system is divided into two separate parts: the bioreactor for treatment and an external separator for phase separation. This segmentation allows the separator to be maintained independently without shutting down the entire reactor, resolving the contradiction between separation efficiency and maintenance accessibility.
Solution Approach 2:
The three-phase separator is extracted from the interior of the bioreactor and placed externally. This extraction eliminates the accessibility problems associated with internal separators while maintaining the separation function, as the external separator can be accessed and maintained without interfering with reactor operation.
2Ease of operation
If the external separator is positioned at the same height or below the bioreactor bottom, then installation flexibility and maintenance are improved, but additional pumping energy is required to return the fluid phase
Solution Approach 1:
Biogas is utilized as a lifting gas to create hydraulic flow that returns the fluid phase enriched in granular biomass from the external separator back to the bioreactor. This pneumatic-hydraulic mechanism eliminates the need for additional pumping energy, resolving the contradiction between ease of operation and energy consumption.
Solution Approach 2:
The system uses its own produced biogas to drive the recirculation of the fluid phase. The biogas serves a dual function: it is a treatment product and simultaneously provides the energy needed for phase separation and biomass recirculation, making the system self-sufficient and eliminating external energy input for pumping.
3Reliability
If conventional internal settlers are used, then biomass retention is achieved, but blockages and maintenance difficulties occur during low biogas production
Solution Approach 1:
By separating the phase separation function from the bioreactor into an external unit, the system eliminates the blockage problems that occur with internal settlers during low biogas production. The external separator operates independently and can be maintained without affecting reactor continuity, resolving the contradiction between biomass retention and operational 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 improves the efficiency of wastewater treatment by ensuring effective separation of phases, simplifies maintenance, and allows for easier reactor upgrades, maintaining a stable biomass environment and reducing the risk of blockages.
Implementation Method 1
biogas-driven flow
Implementation Method 2
granular biomass settles
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method for treating an aqueous fluid comprising a biodegradable organic substance in an installation comprising an upflow bioreactor containing a sludge bed, said sludge bed comprising biomass, and an external separator, comprising - feeding the aqueous fluid into a lower part of the bioreactor and forming biogas; - withdrawing the fluid from an upper part of the bioreactor, which withdrawn fluid comprises biomass; - feeding the aqueous fluid withdrawn from the upper part of the bioreactor into the external separator wherein the aqueous fluid comprising the biomass is separated into a liquid phase, and a fluid phase enriched in biomass; and - returning said fluid phase enriched in biomass from the external separator to the bioreactor.