Downflow Denitrification System Dual Media Filtration
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Solution Overview
Problem
Existing water and wastewater denitrification systems face challenges in effectively removing both nitrates and suspended solids while maintaining a compact footprint, as they often require large spaces and struggle with efficient suspended solid capture.
Innovation Solution
A downflow denitrification system utilizing two types of granular and/or angular media with varying surface areas, where high surface area media supports microorganism growth for nitrate removal and a second media type captures suspended solids, combined with an automated backwash sequence for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a filter media with large surface area is used to support more denitrifying microorganisms, then nitrate removal efficiency is improved, but the ability to capture suspended solids deteriorates
Solution Approach 1:
The filter bed is divided into two distinct segments: an upper layer with high surface area media for nitrate removal and a lower layer with low surface area media for suspended solids capture. This segmentation allows each layer to specialize in its primary function without interfering with the other, resolving the contradiction between nitrate removal efficiency and suspended solids capture ability
Solution Approach 2:
Different regions of the filter bed are assigned different media properties tailored to their specific functions. The upper layer uses high surface area media optimized for microbial attachment and nitrate removal, while the lower layer uses low surface area media optimized for physical filtration of suspended solids. This local quality differentiation enables both functions to operate at optimal performance levels simultaneously
2Productivity
If a deep bed filtration system is used to remove nitrates and suspended solids, then treatment effectiveness is improved, but the system footprint increases
Solution Approach 1:
The system transitions from horizontal expansion to vertical organization by stacking two functional layers vertically. This dimensional change allows the system to maintain deep bed filtration effectiveness while minimizing the horizontal footprint, as the treatment functions are arranged in the vertical dimension rather than requiring additional horizontal space
3Device complexity
If a single media type is used in the filter bed, then system complexity is reduced, but the ability to simultaneously remove nitrates and suspended solids deteriorates
Solution Approach 1:
The dual-media filter bed creates a system where each layer performs multiple functions: the upper layer handles nitrate removal while also providing some filtration, and the lower layer handles suspended solids capture while supporting the upper layer. This multi-functionality arrangement allows simultaneous removal of both pollutants without significantly increasing system complexity
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 achieves effective nitrate and suspended solid removal with a smaller footprint, maintaining efficient pollutant removal rates and minimizing space requirements, while optimizing backwash processes for biomass retention and media cleanliness.
Implementation Method 1
a first filtration bed comprising a first granular and/or angular media, the first granular and/or angular media having a high surface area and configured for biological and physical treatment of the water or wastewater
Implementation Method 2
a second filtration bed comprising a second granular and/or angular media, the second granular and/or angular media having a lower surface area than the first granular and/or angular media
Implementation Method 3
Removal of nitrogen from waste water by the use of nitrifying and denitrifying bacteria generally involves conversion of organic nitrogen and ammonia into nitrates, followed by removal of the nitrates by denitrifying microorganisms to yield nitrogen gas
Data Source
AI summary
In general, the present invention is directed to systems for treating water or wastewater. In accordance with some embodiments of the present invention, the system may utilize a vessel with a plurality of filter beds, at least one inlet, and at least one outlet, and the system may include: a first filtration bed comprising a first granular and/or angular media, the first media having a high surface area and configured for biological and physical treatment of the water or wastewater; a second filtration bed including a second granular and/or angular media, the second media having a lower surface area than the first media; wherein the water or wastewater enters the vessel via the at least one inlet, flows through the first filtration bed and the second filtration bed, and exits the vessel through the at least one outlet.