Anaerobic-Aerobic Waste Treatment System with Ion-Exchange Membrane
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Solution Overview
Problem
Anaerobic digestion of aquacultural wastewater is challenging due to ammonia inhibition and high solids concentration, leading to inefficient treatment and large volume waste generation, with existing methods failing to effectively reduce ammonia and total solids concentrations.
Innovation Solution
A system comprising a first anaerobic digestion chamber and a second aerobic nitrification reactor separated by a semipermeable ion-exchange membrane, with a filtration component to separate solid and liquid fractions, allowing for the reduction of ammonia and total solids through denitrification and mechanical filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If anaerobic digestion is used to treat aquacultural wastewater, then organic carbon and solids are reduced, but ammonia inhibition and high solids concentration prevent effective treatment
Solution Approach 1:
The treatment system is divided into two separate chambers: an anaerobic digestion chamber for organic matter breakdown and an aerobic nitrification chamber for ammonia removal. This segmentation allows each chamber to optimize its specific function without interference from the other process conditions, resolving the contradiction between organic carbon reduction and ammonia inhibition.
Solution Approach 2:
The harmful ammonia substance is extracted from the anaerobic digestion process by directing it to a separate aerobic nitrification chamber. This extraction removes the inhibitory effect of ammonia on anaerobic digestion while maintaining the beneficial organic carbon reduction in the first chamber.
2Quantity of substance
If solids are treated by dilution, then solids concentration is reduced, but a very large volume of waste is created
Solution Approach 1:
Instead of changing the volume parameter through dilution, the system changes the concentration parameter through biological transformation. The aerobic nitrification chamber converts ammonia to nitrate, reducing the quantity of harmful substances without increasing waste volume, thus resolving the contradiction between solids concentration reduction and waste volume generation.
3Quantity of substance
If physical removal of ammonia is used, then ammonia concentration is reduced, but the method has not proven satisfactory
Solution Approach 1:
The patent replaces physical/mechanical ammonia removal methods with a biological treatment system. The aerobic nitrification chamber uses microorganisms to convert ammonia to nitrate, providing a more reliable and satisfactory treatment approach compared to mechanical methods that have proven insufficient.
4Device complexity
If a single chamber is used for waste treatment, then device complexity is low, but multiple substances cannot be treated in different environments
Solution Approach 1:
The treatment system is segmented into two chambers with different environmental conditions (anaerobic and aerobic). This segmentation enables the system to treat multiple substances (organic carbon and ammonia) in their respective optimal environments while maintaining relatively simple overall device structure through the use of a shared barrier and filtration system.
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 system effectively reduces ammonia concentrations, total solids, and chemical oxygen demand, creating a stable and cost-effective anaerobic digester suitable for treating aquacultural wastewater, improving treatment efficiency and reducing waste volume.
Implementation Method 1
a semipermeable barrier disposed between the first chamber and the second chamber allowing at least the first substance to pass between the first and second chamber while prohibiting the second substance
Implementation Method 2
a semipermeable barrier disposed between the first chamber and the second chamber
Implementation Method 3
a mechanical filter for separating materials suitable for treatment in the first chamber but not the second chamber from material to be treated in the second chamber
Implementation Method 4
The first chamber is an anaerobic digestion chamber
Implementation Method 5
the second chamber may be an aerobic nitrification reactor
Data Source
AI summary
System and methods for treating multi-component waste streams. In general, systems and methods described herein employ a first chamber and a second chamber separated by a barrier and a filtration component that is fluidically connected to the first and second chambers. A waste stream to be treated will flow into the first chamber for treatment of the carbon-containing waste, then into the filtration component for the separation of the stream into a solid waste fraction and a liquid waste fraction.