Integrated DAF and Equalization Reactor for Soluble BOD Removal
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Solution Overview
Problem
Existing dissolved air flotation (DAF) wastewater treatment systems face inefficiencies in removing soluble biological oxygen demand (BOD) and require costly two-stage setups with large equalization basins to achieve compliance with BOD and nitrogen pretreatment limits, due to limitations in biomass growth and oil and grease buildup.
Innovation Solution
A compact, single or multiple stage DAF treatment system integrating an equalization reactor and DAF cells within a common structure, utilizing aeration and mixing devices to enhance soluble BOD and nitrogen removal, allowing for controlled biomass growth and preventing oil and grease buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flow equalization basin is used to provide hydraulic flow equalization upstream from a DAF cell, then hydraulic flow equalization is achieved, but soluble BOD removal is insufficient due to biomass growth limitations and oil and grease buildup
Solution Approach 1:
The patent combines the flow equalization basin and DAF cell into a single integrated structure where the DAF cell is positioned within the equalization basin. This merging allows the system to simultaneously achieve hydraulic flow equalization and effective soluble BOD removal through in-situ biomass growth and flotation, eliminating the need for separate structures and enabling consistent removal of soluble BOD while avoiding O&G buildup issues that plague conventional separate systems.
2Reliability
If a two stage DAF pretreatment system with an intermediate FEB is used, then soluble and total BOD removal capability is achieved, but installation cost becomes prohibitive
Solution Approach 1:
The patent merges multiple treatment functions into a single integrated structure where a DAF cell is positioned within an equalization basin. This single integrated structure performs both hydraulic equalization and BOD removal (both soluble and total) that traditionally required two separate DAF cells and an intermediate equalization basin, thereby significantly reducing system complexity and installation cost while maintaining reliable BOD removal capability.
Solution Approach 2:
The integrated structure serves multiple functions simultaneously: the equalization basin provides hydraulic flow equalization, the DAF cell removes oils and greases, and the combined system achieves both soluble and total BOD removal. This multi-functionality eliminates the need for separate dedicated structures for each treatment function, reducing overall system complexity and cost.
3Area of stationary object
If DAF cells are combined with an equalization reactor in one common structure, then system compactness and cost-effectiveness improve, but space for biomass growth and prevention of oil and grease buildup must be adequately provided
Solution Approach 1:
The patent positions the DAF cell inside the equalization basin, creating a nested configuration where one treatment structure is placed within another. This nesting arrangement maximizes space utilization, allowing the system to provide adequate volume for biomass growth and O&G separation within a compact footprint. The DAF cell operates within the equalization basin, enabling both functions to coexist in a space-efficient manner while maintaining reliable biomass growth capability for soluble BOD removal.
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 consistent soluble BOD, total BOD, and nitrogen removal within regulatory limits, reducing capital costs and energy consumption while maintaining effluent quality, and is more efficient and cost-effective than traditional two-stage systems.
Implementation Method 1
utilizing aeration and mixing devices to enhance soluble BOD and nitrogen removal, allowing for controlled biomass growth
Implementation Method 2
utilizing aeration and mixing devices to enhance soluble BOD and nitrogen removal
Implementation Method 3
dissolved air flotation (DAF) treatment system... DAF cells are combined with an equalization reactor... to provide controlled, consistent soluble BOD removal
Data Source
AI summary
Wastewater treatment tank for achieving hydraulic flow equalization and high efficiency soluble biological oxygen demand (BOD) removal. The wastewater treatment tank provides a compact arrangement of at least one dissolved air flotation (DAF) cell and an equalization reactor cell. The tank achieves regulatory wastewater pretreatment requirements for reducing total BOD concentrations below 250 to 300 mg/L.