Separator Tank Insert Vortex Flow Control
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Solution Overview
Problem
Existing separator tanks face challenges in achieving high flow rates while maintaining effective separation and removal efficiency of contaminants from rainwater and runoff, particularly in handling high flow events and preventing re-entrainment of settled contaminants.
Innovation Solution
The design includes an insert with a modified weir, orifice plate, drop tube with vertical vanes, and a base configuration that induces a controlled vortex and dissipates it, increasing the flow rate through the separator tank while ensuring high separation efficiency, including offsetting the insert, increasing weir height, and modifying the drop tube to prevent re-entrainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional separator tank designs are used, then structural simplicity is maintained, but hydraulic capacity and flow rate are limited
Solution Approach 1:
The separator tank is divided into distinct functional zones using a multi-component insert system. The insert includes a weir structure, drop tube, and baffle elements that segment the tank interior into separate flow paths and treatment zones, enabling each component to perform a specific function while collectively increasing overall hydraulic capacity
Solution Approach 2:
The insert structure extends vertically into the tank, utilizing the vertical dimension to create multiple flow levels and stages. The weir, drop tube, and baffle are positioned at different heights to establish a three-dimensional flow pattern that increases residence time and separation efficiency without increasing the tank's horizontal footprint
2Productivity
If high flow rates are achieved, then hydraulic capacity increases, but separation efficiency and contaminant removal decrease
Solution Approach 1:
The flow path is segmented into multiple stages: initial flow distribution at the weir, vertical drop through the drop tube, horizontal flow along the baffle, and final discharge. This segmentation allows each stage to handle specific separation tasks, maintaining high removal efficiency even at increased flow rates by preventing overwhelming any single separation mechanism
Solution Approach 2:
The insert design ensures continuous flow through all treatment zones without dead spots or recirculation areas. The weir, drop tube, and baffle are configured to maintain uninterrupted flow paths that continuously expose contaminants to separation mechanisms throughout the entire flow duration, ensuring consistent removal efficiency across varying flow rates
3Productivity
If flow velocity is increased to handle high flow events, then hydraulic capacity improves, but re-entrainment of settled contaminants occurs
Solution Approach 1:
The baffle structure extends vertically to create a sheltered zone behind it where flow velocity is reduced. This vertical extension creates a protected region that traps settled contaminants and prevents them from being re-entrained by high-velocity flow, effectively using the vertical dimension to shield settled particles from disruptive horizontal flow
4Productivity
If insert components are added to increase flow rate, then hydraulic capacity improves, but manufacturing complexity and cost increase
Solution Approach 1:
Multiple functional elements (weir, drop tube, baffle) are merged into a single integrated insert assembly that can be manufactured as one piece or pre-assembled unit. This consolidation reduces the number of separate components that need to be fabricated and installed, simplifying manufacturing while maintaining all the flow control and separation functions
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 enhanced design significantly increases the hydraulic capacity and sediment removal efficiency, achieving up to 90.4% removal efficiency at low flow rates and maintaining high efficiency across varying flow conditions, with improved vortex control and distribution reducing re-entrainment of contaminants.
Implementation Method 1
induces a controlled vortex and dissipates it
Implementation Method 2
separate and entrap free and floating oils, grease, hydrocarbon, petroleum products, and total suspended solids
Implementation Method 3
orifice plate... increasing the flow rate through the separator tank
Data Source
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AI summary
A separator tank for separating and trapping contaminants in rainwater and runoff is disclosed. According to one embodiment of the present invention, the separator tank comprises a container having a bottom wall, side wall, and top wall defining an internal chamber; an insert located inside of the internal chamber, the insert comprising a weir defining an intake area between the weir and the side wall; and a round-edged orifice positioned within the intake area; an inlet conduit for introducing an influent liquid into the intake area; wherein the weir is positioned such that the weir induces the influent liquid to flow in a swirling motion within the intake area. According to another embodiment of the present invention an insert for a separator tank is disclosed. The insert includes a weir defining an intake area for receiving an influent liquid; and a round-edged orifice positioned within the intake area.