Air Flotation Screening Tank for HRT-SRT Decoupled Digestion
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Solution Overview
Problem
Existing organic solid waste anaerobic digestion systems struggle to completely uncouple hydraulic retention time (HRT) from sludge retention time (SRT), leading to incomplete separation of heavy inert materials and active light materials, which affects the efficiency and effectiveness of the process.
Innovation Solution
An anaerobic digestion device incorporating a self-sustaining air flotation screening tank with a first and second separating mechanism, utilizing rotating and cone-shaped components to achieve swirl separation and solid-liquid separation, allowing for the complete separation of heavy inert and light active materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single separating mechanism is used in the anaerobic digestion device, then the device complexity is reduced, but the separation completeness of heavy inert materials and light active materials is insufficient
Solution Approach 1:
The patent divides the separating mechanism into two distinct parts: a first separating mechanism for initial separation and a second separating mechanism for further separation. This segmentation allows each mechanism to specialize in specific separation tasks, achieving more complete separation of heavy inert materials from light active materials while keeping each individual mechanism relatively simple in structure.
2Productivity
If the anaerobic digestion device uses traditional completely mixed reactors, then the operation is simple, but the maximum organic load can only reach 10 kg/m³·d which is far from the efficiency of natural reactors
Solution Approach 1:
The patent introduces a dynamic self-sustaining air flotation mechanism that automatically adjusts the separation process based on gas production. The air flotation system dynamically separates light active materials from heavy inert materials without requiring complex external control systems, thereby increasing organic load capacity while maintaining operational simplicity.
3Reliability
If heavy inert materials are not completely discharged from the system, then the device complexity is reduced, but the inhibitory effect on the biological process increases
Solution Approach 1:
The patent extracts and removes heavy inert materials from the system through a dedicated discharge system that works in conjunction with the dual separating mechanisms. The first separating mechanism初步 separates materials, and the second separating mechanism further separates remaining mixed materials, ensuring heavy inert materials are completely discharged while light active materials are returned to the reaction device, thereby maintaining biological process stability.
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
The device effectively separates heavy inert materials from light active materials, enhancing the practicality and efficiency of the anaerobic digestion process by ensuring only active components are recycled, thereby improving the overall performance of the system.
Implementation Method 1
which is based on the spontaneous gas production (CH4, CO2 and so on) in the anaerobic digestion process to achieve self-sustaining air flotation of the anaerobic system
Implementation Method 2
spontaneous gas production (CH4, CO2 and so on) in the anaerobic digestion process
Implementation Method 3
the heavy inert materials at the bottom of the self-sustaining air flotation screening tank can be subjected to swirl separation, so that the liquid part, the solid part and the gas part can be completely separated
Implementation Method 4
a bottom of the first separating mechanism is connected with a second separating mechanism... the plurality of through holes and the plurality of stirring rods are in staggered arrangement
Data Source
AI summary
An organic solid waste anaerobic digestion device based on uncoupling of hydraulic retention time (HRT) from sludge retention time (SRT) includes a self-sustaining air flotation screening tank. A sludge pipe of the self-sustaining air flotation screening tank is connected with a first separating mechanism. A bottom of the first separating mechanism is connected with a second separating mechanism, and two separating mechanisms are connected with a return pipe of the self-sustaining air flotation screening tank. Through the two separating mechanisms, the heavy inert materials at the bottom of the self-sustaining air flotation screening tank can be subjected to swirl separation, so that the liquid part, the solid part and the gas part can be completely separated, and then the useful active materials are conveyed to the reaction device.