Flexible Anaerobic Digester Structure for UV Durability and Cleaning
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Solution Overview
Problem
Conventional anaerobic digesters are costly, complex, and difficult to clean, with materials like PVC bags susceptible to UV deterioration and fouling, and importation increases construction costs and delays, particularly in African settings.
Innovation Solution
A single compartment anaerobic digestion chamber with a flexible PVC inner bag and polyester-coated vinyl outer reinforcement, featuring baffles for mixing and airtight seals, made from durable materials like HDPE, with a greenhouse cover for heat retention, and a drainage hole for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional PVC bags are used in digesters, then flexibility and ease of installation are improved, but UV deterioration and long-term durability are worsened
Solution Approach 1:
The patent applies composite materials by combining PVC inner bag with an outer layer made of UV-resistant materials such as HDPE, polypropylene, or polyester-coated vinyl. This composite structure maintains the flexibility and ease of installation of PVC while adding UV protection and long-term durability through the outer layer that resists ultraviolet deterioration and mechanical damage.
2Productivity
If multi-compartment digesters are used to separate biochemical processes, then digestion efficiency is improved, but manufacturing complexity and cost are worsened
Solution Approach 1:
The patent applies segmentation by dividing the single digester compartment into distinct functional zones using baffles and structural divisions. The digester is segmented into a mixing zone with baffles for hydrolysis and acidogenesis, and a settling zone for acetogenesis and methanogenesis. This allows separation of biochemical processes within a single compartment, improving digestion efficiency while avoiding the manufacturing complexity of multiple separate compartments.
Solution Approach 2:
The patent applies local quality by providing different structural features in different zones of the digester. The mixing zone has baffles and agitation mechanisms for thorough mixing, while the settling zone has a calm environment for sedimentation and methane production. This localized differentiation of structural qualities enables process separation without requiring multiple separate compartments.
3Strength
If conventional digesters are used without drainage access, then structural integrity is improved, but ease of maintenance and cleaning are worsened
Solution Approach 1:
The patent applies flexible shells by using a flexible PVC inner bag that can be easily removed and replaced. The flexible nature of the bag allows it to be detached through the access opening without compromising the structural integrity of the rigid outer digester structure. This enables easy maintenance and cleaning by simply removing the flexible bag while maintaining the strength of the overall digester structure.
4Adaptability or versatility
If importation of digesters is used, then availability of technology is improved, but construction cost and time are worsened
Solution Approach 1:
The patent applies copying by providing detailed design specifications, drawings, and manufacturing guidelines that enable local replication of the digester design. Instead of importing complete digesters, the patent allows local manufacturers to copy and produce digesters using available materials and fabrication capabilities, thereby reducing construction time and costs while maintaining technological standards.
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 design is economical, durable, and easy to maintain, enhancing methane production efficiency while reducing construction costs and material degradation, suitable for African conditions.
Implementation Method 1
the top member is resiliently flexible and expands as gas is generated in the base member
Implementation Method 2
sealing means for sealing the top member to the base member
Implementation Method 3
a greenhouse cover for heat retention
Implementation Method 4
anaerobic digestion has essentially four stages, namely: Hydrolysis, Acidogenesis, Acetogenesis, and Methanogenesis
Data Source
AI summary
An anaerobic digester assembly with a horizontally arranged elongate reactor vessel having an elongate base member and a resiliently flexible top member covering an operatively upper open end of the base member, with the resiliently flexible top member being sealed and secured relative to the base member such that the resiliently flexible top member, and with the base member defining an organic waste inlet at a first end thereof and a digestate outlet at a second end thereof.