Phagotrophic Algae Digestion of Solid Organic Waste
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Solution Overview
Problem
Current methods for disposing of organic solid waste, such as landfilling, incineration, and anaerobic digestion, face environmental issues and high costs, with anaerobic digestion requiring lengthy times and significant capital investment, while lacking efficiency in treating insoluble organic materials.
Innovation Solution
A method utilizing phagotrophic algae to convert organic solid materials into algal biomass and products, where algae engulf and digest insoluble materials, reducing pathogens and producing valuable algal products like biodiesel, with pretreatment steps to enhance processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If anaerobic digestion is used to treat organic solid waste, then methane-containing biogas is generated for electricity production, but the processing time is lengthy (20-30 days) and capital cost is high
Solution Approach 1:
The patent introduces pretreatment steps (mechanical, thermal, or chemical) as intermediary processes before anaerobic digestion to break down complex organic structures. This mediator preparation phase enables faster subsequent digestion, reducing the overall processing time from 20-30 days to a shorter duration while maintaining energy recovery efficiency.
Solution Approach 2:
The patent applies preliminary actions by conducting pretreatment operations (size reduction, heating, or chemical modification) on organic solid waste before the main anaerobic digestion process. This preliminary breakdown of recalcitrant materials accelerates the subsequent biodegradation, thereby reducing the lengthy processing time associated with conventional anaerobic digestion.
2Loss of energy
If anaerobic digestion is used to treat organic solid waste, then biogas is produced, but the capital cost is high due to lengthy time requirements and waste activated sludge disposal
Solution Approach 1:
The patent changes key process parameters by introducing pretreatment conditions (temperature, pH, mechanical force) that modify the physical and chemical properties of organic solid waste. These parameter changes enhance biodegradability, allowing the anaerobic digestion process to operate more efficiently with reduced reactor volume and shorter retention times, thereby lowering capital costs.
Solution Approach 2:
The patent replaces or supplements the purely biological mechanical system of anaerobic digestion with combined mechanical/thermal/chemical pretreatment systems. This substitution breaks down complex structures before biological action, reducing the burden on the anaerobic digester and enabling smaller, more cost-effective reactor designs.
3Ease of manufacture
If conventional methods are used to dispose of organic solid waste, then disposal is achieved, but environmental issues arise such as wind-blown litter, vermin attraction, liquid leachate, and gaseous pollutants
Solution Approach 1:
The patent converts harmful organic waste materials into beneficial products through anaerobic digestion, transforming potential pollutants into methane-containing biogas for energy production. This conversion eliminates environmental hazards associated with landfilling (leachate, vermin attraction) and incineration (gaseous pollutants) while creating a useful energy resource.
Solution Approach 2:
The patent employs controlled oxidation processes during pretreatment and digestion to break down complex organic structures and pathogens. This accelerated oxidative breakdown, combined with biological degradation, effectively eliminates harmful factors while converting waste into energy, avoiding the environmental issues of conventional disposal methods.
4Productivity
If phagotrophic algae are used to convert organic solid materials, then valuable algal products are produced with shorter processing time, but the method requires pretreatment steps to enhance processing efficiency
Solution Approach 1:
The patent applies preliminary actions by conducting pretreatment operations (size reduction, heating, or chemical modification) on organic solid waste before the main anaerobic digestion process. This preliminary breakdown of recalcitrant materials accelerates the subsequent biodegradation, thereby reducing the lengthy processing time associated with conventional anaerobic digestion.
Solution Approach 2:
The patent changes key process parameters by introducing pretreatment conditions (temperature, pH, mechanical force) that modify the physical and chemical properties of organic solid waste. These parameter changes enhance biodegradability, allowing the anaerobic digestion process to operate more efficiently with reduced reactor volume and shorter retention times, thereby lowering capital costs.
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 approach effectively disposes of organic waste, reduces pathogens, and produces valuable algal products, achieving higher product values and lower capital costs compared to anaerobic digestion, with processing times significantly shorter than traditional methods.
Implementation Method 1
A method utilizes phagotrophic algae to convert organic solid materials into algal biomass and products, where algae engulf and digest insoluble materials
Data Source
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AI summary
A method for treating solid organic materials includes providing phagotrophic algae, providing solid organic material, combining the algae and the solid organic material, allowing the algae to grow by engulfing or uptaking the solid organic material, forming an algal product, and collecting the algal product. The method can also include a pretreatment step. The solid organic material can be waste activated sludge. A system for treating and disposing solid organic material is also provided.