Portable Anaerobic Digester Plugging Prevention
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Solution Overview
Problem
Traditional anaerobic digesters face issues with plugging due to solid precipitation, require significant maintenance, and are not portable, making them unsuitable for temporary or seasonal waste processing needs, especially in industries like agriculture and food processing.
Innovation Solution
A portable, automated anaerobic digester system with a digester tank, drainage trough, auger, skimmer, and double valve chamber, along with a gas trap tank and propeller, which includes a self-contained module design for easy movement and operation, and a controller for managing heavy solids and agitation cycles to prevent plugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional anaerobic digesters are used to process organic waste at high rates, then the amount of organic waste processed increases, but the frequency and severity of plugging increases
Solution Approach 1:
The digester is divided into multiple zones including a floating cover section, a fixed wall section, and a conical bottom section. This segmentation allows different regions to handle different functions - the floating cover accommodates gas accumulation while the conical bottom facilitates solid removal, thereby preventing plugging while maintaining high processing rates
Solution Approach 2:
The digester employs a floating cover that moves dynamically with gas accumulation rather than a fixed rigid cover. This dynamic structure adapts to varying gas volumes, preventing pressure buildup and plugging while maintaining continuous operation at high waste processing rates
2Reliability
If traditional anaerobic digesters are made as semi-permanent installations, then the digestion process is stable, but the cost to move the digester increases
Solution Approach 1:
The digester is designed as modular segments including a removable floating cover, detachable wall sections, and a conical bottom assembly. These segmented components can be disassembled and reassembled at different locations, reducing moving costs while maintaining process stability through standardized connection interfaces
Solution Approach 2:
The digester structure uses adjustable parameters such as the floating cover height and wall section configurations that can be modified during relocation. This allows the system to adapt to different site conditions while maintaining reliable digestion performance, reducing the need for expensive custom engineering at each location
3Device complexity
If traditional anaerobic digesters operate without automated controls, then the device complexity is low, but the maintenance time required increases
Solution Approach 1:
The digester incorporates automatic gas collection under the floating cover that self-regulates pressure and flow without manual intervention. The conical bottom design automatically directs solids to collection points, eliminating the need for frequent manual scraping and reducing maintenance time while keeping the control system simple
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 system effectively prevents plugging, maintains high anaerobic digestion rates, and allows for easy relocation, reducing operational costs and capital expenditures by enabling temporary or seasonal installations.
Implementation Method 1
Through anaerobic digestion, large quantities of organic matter are broken down by bacteria that convert the organic matter into biogas
Implementation Method 2
The propeller creates an agitation cycle that can be adjusted depending on the type of waste being digested
Implementation Method 3
The skimmer pushes waste into the drainage trough
Implementation Method 4
A double valve chamber purges heavy solids precipitated from the waste
Implementation Method 5
A gas trap tank keeps the drainage trough air tight
Data Source
AI summary
An apparatus for digesting waste includes a digester tank, a drainage trough located near a top of the digester tank, an auger located inside the drainage trough, and a skimmer that pushes waste into the drainage trough.