Anaerobic Column Reactor Segmented Flow Control
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Solution Overview
Problem
Conventional anaerobic reactor systems face issues such as biomass washout, clogging, high operational costs, and inefficiencies in treating biodegradable wastes due to requirements for granular sludge, mechanical agitation, and complex configurations, which render them techno-economically unviable for biomethanation of biodegradable wastes.
Innovation Solution
An anaerobic column reactor with a unique arrangement of expanded and constricted portions vertically connected, which enhances mixing patterns and mass transfer rates while controlling biomass washout by regulating upflow liquid velocity, eliminating the need for granular sludge and mechanical mixing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If suspended growth system (UASB reactor) is used for anaerobic treatment, then biomass concentration can be maintained, but at low hydraulic retention times increased upflow velocity causes biomass washout from the reactor
Solution Approach 1:
The reactor column is segmented into multiple sections with alternating expanded and constricted portions. The constricted portions act as flow regulators that reduce upflow velocity to prevent biomass washout, while expanded portions provide volume for biomass accumulation and treatment. This segmentation allows the system to maintain high productivity without losing biomass.
Solution Approach 2:
Different sections of the reactor have different local qualities - constricted portions with high flow velocity for efficient waste processing, and expanded portions with lower velocity for biomass retention. This spatial variation in flow characteristics allows simultaneous achievement of high treatment efficiency and biomass retention throughout the reactor.
2Quantity of substance
If attached growth system with porous inert packing media is used, then biomass can be supported, but Suspended Solid may develop progressive clogging of the packed bed and create preferential hydraulic pathways
Solution Approach 1:
The invention removes the porous inert packing media entirely from the reactor system. Instead of supporting biomass on packing media, the system uses suspended growth in expanded portions with flow regulation in constricted portions. This extraction eliminates the clogging and short-circuiting problems associated with packed beds while maintaining effective biomass support.
3Ease of operation
If conventional UASB reactor configuration is used, then gas-liquid-solid separation can be achieved, but development and maintenance of sludge blanket thickness and its retention at particular height is extremely difficult and troublesome
Solution Approach 1:
The reactor employs dynamic flow regulation through constricted portions that automatically adjust local flow velocity based on overall reactor conditions. This dynamic control mechanism simplifies sludge blanket maintenance by using flow physics rather than mechanical devices, making phase separation easier to operate while reducing system complexity.
Solution Approach 2:
The constricted portions self-regulate flow velocity to maintain appropriate sludge blanket conditions without external intervention. The geometry of constricted sections naturally creates flow patterns that retain sludge at optimal levels, eliminating the need for complex control systems while maintaining effective phase separation.
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 achieves high treatment efficiency, reduces operational costs, and allows for efficient biogas recovery from biodegradable wastes without the need for granular sludge or mechanical mixing, making the process more cost-effective and environmentally friendly.
Implementation Method 1
controlling the biomass washout by regulating the upflow liquid velocity
Implementation Method 2
enhances the mixing pattern and thereby the mass transfer rates
Implementation Method 3
conversion of biodegradable organic matter present in wastewaters and solid wastes into biogas and compost
Data Source
AI summary
The present invention relates to an anaerobic column reactor for biodegradation of wastes. Particularly the present invention relates to a process for conversion of biodegradable wastes to biogas and compost. More particularly, the present invention relates to an anaerobic reactor with unique arrangement of expanded and constricted portions alternatively placed vertically over each other which enhances the mixing pattern and thereby the mass transfer rates while controlling the biomass washout by regulating the upflow liquid velocity.