Hydrodynamic Separator with Down Pipes for Stormwater
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Solution Overview
Problem
Current hydrodynamic separators are ineffective in capturing finer sediments and oils due to limited velocity reduction and flow path maximization, leading to reduced sediment retention and increased maintenance costs due to restricted access for cleaning.
Innovation Solution
A hydrodynamic separator design incorporating a flow splitter to redirect water flow, an oil-floatables skimmer to isolate hydrocarbons, and an outlet weir with down pipes to control velocity and maximize flow path, along with enhanced maintenance access for efficient sediment removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If velocity reduction is increased to improve sediment capture, then finer sediment removal is improved, but flow path length and treatment time are extended
Solution Approach 1:
The separator is divided into multiple functional zones: inlet chamber, settling chamber, and outlet chamber, with internal structures like weirs and baffles that segment the flow path to maximize contact time and separation efficiency without excessive length
Solution Approach 2:
The patent introduces vertical flow components and three-dimensional flow paths within the settling chamber, transitioning from simple horizontal flow to multi-dimensional flow patterns that increase treatment effectiveness without proportionally increasing linear dimensions
2Productivity
If flow path is maximized to improve sediment retention, then treatment efficiency is improved, but device size increases
Solution Approach 1:
The patent employs curved surfaces and circular flow paths within the settling chamber that allow water to follow a longer, more meandering flow path within a compact footprint, maximizing contact time without proportionally increasing the overall device volume
Solution Approach 2:
Internal structures such as weirs, baffles, and flow control elements are nested within the settling chamber, creating multiple flow paths and reflection surfaces that extend the effective treatment path without adding external dimensions
3Ease of repair
If access for maintenance is improved to reduce cleaning difficulty, then ease of repair is improved, but structural complexity increases
Solution Approach 1:
The separator structure is segmented with removable panels, access doors, and modular components that allow maintenance personnel to access the settling chamber and remove accumulated sediments without dismantling the entire structure, balancing access requirements with structural integrity
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 design achieves greater than 80% removal of total suspended solids and up to 99% retention of free-floating oils, while providing improved access for maintenance, reducing sediment storage capacity issues and maintenance frequency.
Implementation Method 1
a flow splitter to redirect water flow upon entering the sump chamber from the inlet pipe
Implementation Method 2
an oil-floatables skimmer to isolate hydrocarbons
Implementation Method 3
one or more down pipes which siphon water from the lower portion of the sump chamber
Implementation Method 4
an outlet weir with down pipes to control velocity and maximize flow path
Implementation Method 5
advanced sediment removal devices based on principles of hydrodynamic and gravity separation
Data Source
AI summary
A method, system, and apparatus directed to an innovative approach for the treatment of stormwater utilizing hydrodynamic separator assembly designed to maximize flow movement for more efficient sediment removal and maximize clearance space within assembly to facilitate cleaning and increase storage capacity of trash, debris, and sediment. In particular, the described hydrodynamic separator is an improvement over other hydrodynamic separators known in the art with the inclusion of one or more down pipes which siphon water from the lower portion of the sump chamber. The inclusion of down pipes allows for an improved control of the velocity of the water flow through the device by distributing flow into more than one path.