Biofilter Gas Collector Mitigates Microbial Clogging
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Solution Overview
Problem
Biofilters used for waste liquid purification face issues with clogging due to the formation of a compact microbial layer over time, leading to reduced lifespan and efficiency, especially when treating highly polluted liquids.
Innovation Solution
A biofilter design with a housing containing a layer of organic filtering material, where a forced O2-containing gas supply is used in conjunction with a gas collector to control microbial proliferation by retrieving upwardly moving gas, thereby reducing clogging and maintaining efficient filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a biofilter uses organic filtering material to support microorganisms for pollutant degradation, then purification efficiency is improved, but clogging of the filtering material occurs over time reducing operational lifespan
Solution Approach 1:
The patent introduces a gas collector that dynamically adjusts gas retrieval based on microbial layer development. As the microbial layer thickens and increases resistance, the system progressively retrieves more gas, preventing complete clogging and extending operational lifespan while maintaining purification efficiency.
Solution Approach 2:
The gas collector acts as a feedback mechanism that responds to changes in filtering material resistance. By monitoring and retrieving gas based on the developing microbial layer, the system self-regulates to prevent clogging without requiring external intervention, thus extending operational lifespan.
2Productivity
If O2-containing gas is supplied to support microbial proliferation for pollutant degradation, then purification capacity is improved, but excessive gas promotes harmful microbial layer formation causing clogging
Solution Approach 1:
The patent changes the parameter of gas retrieval progressively over time. As the microbial layer develops, the gas collector retrieves increasing amounts of gas, adjusting the oxygen availability to prevent excessive microbial proliferation and associated clogging while maintaining sufficient purification capacity.
Solution Approach 2:
The patent converts the harmful effect of gas-promoted microbial clogging into a beneficial control mechanism. The gas collector uses the same gas that could cause harm to instead regulate and control microbial layer development, transforming potential clogging into a managed process that maintains purification capacity.
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 biofilter effectively prolongs its operational life by preventing clogging and maintaining efficient filtration, as evidenced by stable operation and high purification efficiency over a two-year period without significant surface clogging or maintenance.
Implementation Method 1
supporting microorganisms capable of degradation of pollutants contained in the waste liquid under action of O2
Implementation Method 2
a gas collector located in the housing below at least a portion of said layer and above the gas inlet to retrieve at least some of the gas from inside the housing
Implementation Method 3
Peat is capable of adsorbing many undesirable elements and reducing their level from the environment. It removes pollutants and microbial activity from waste liquids by adsorption and absorption reactions.
Implementation Method 4
Peat is capable of adsorbing many undesirable elements and reducing their level from the environment. It removes pollutants and microbial activity from waste liquids by adsorption and absorption reactions.
Data Source
AI summary
The biofilter is used for the purification of a waste liquid using layers of filtering material, wherein the waste liquid moves downwardly by gravity while an O2-containing gas moves upwardly therein. The biofilter comprises a gas collector to capture at least a portion of the gas moving upwardly therein to mitigate the problem of biofilter clogging due to a microbial seal at the surface of the uppermost filtering layer.