Outlet Well Cover for Grease Interceptor Separation
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Solution Overview
Problem
Large-scale grease interceptors face challenges in designing components and fittings that reliably separate water from fats, oils, and grease (FOG) and solids, leading to cleaning difficulties due to the creation of closed spaces and the spread of floating waste during pumping, which complicates the removal of settled materials.
Innovation Solution
A system featuring a profiled well with a hollow center in the interceptor vessel, accessible from the outside, and a well cover with downwardly facing inlet openings and a central bore for a vertical riser pipe, allowing water to flow while preventing solids and FOG from entering, facilitating easy cleaning and disassembly for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overflow weirs and underflow weirs are used to separate water from solids and FOG, then separation reliability is improved, but cleaning difficulty increases due to closed spaces and waste spread
Solution Approach 1:
The patent extracts the problematic closed spaces created by traditional weirs and replaces them with an open well structure. The outlet well is positioned to extend above the expected FOG layer thickness, allowing direct access to the water column without the interference of FOG and solids that accumulate in closed weir spaces. This extraction of the separation function from closed spaces enables both reliable separation and easy cleaning.
Solution Approach 2:
Instead of using weirs that create closed spaces below the water level, the patent inverts the approach by positioning the outlet well to extend above the FOG layer. The inlet openings face downward into the water column, and the outlet is positioned at the top, reversing the traditional weir configuration. This inversion eliminates closed spaces while maintaining separation effectiveness through the downward-facing inlet geometry.
2Loss of time
If larger volume interceptors are used to extend time between service calls, then service frequency is reduced, but component accessibility for cleaning becomes more difficult
Solution Approach 1:
The patent applies partial action by positioning only the critical outlet components (inlet openings and upper well structure) above the expected waste accumulation level. This allows these specific components to remain accessible for cleaning while the lower portions of the large interceptor can still accumulate larger volumes of waste. The excessive action is achieved by extending the well above the FOG layer thickness, ensuring that even in large volume interceptors, the outlet path remains accessible.
3Reliability
If downwardly facing inlet openings are used to prevent FOG entry, then FOG passage is reduced, but water flow efficiency may be compromised
Solution Approach 1:
The patent applies local quality by making the inlet opening geometry location-specific. The openings face downward at the bottom of the well where water flows, allowing efficient water intake while the downward orientation naturally excludes upward-floating FOG. The local quality of the downward-facing geometry at this specific location achieves both FOG rejection and water flow efficiency without compromising either function.
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 effectively separates water from solids and FOG, preventing their passage through the outflow path and allowing for easy cleaning and maintenance by preventing the accumulation of waste in closed spaces, thus ensuring efficient operation and reduced maintenance complexity.
Implementation Method 1
the openings are positioned at a location below the bottom of the layer of the FOG layer which tends to form at, and then extend below, the surface of the fluid in the tank
Implementation Method 2
Solids which settle in the tank and form a layer at the bottom may collect generally below the level of the top of the volcano-like well
Data Source
AI summary
An outlet well cover for use in an in-line grease interceptor is disclosed. The outlet well cover is fitted onto a hollow well extending upwardly from the bottom of the grease interceptor tank, and having an open top. The outlet well cover has at least one, and preferably two arms that extend outwards and define water passageways from the ends of the arms to the middle of the well. Water inflow openings at the ends of the arms allow clarified water to flow into the covered hollow well. The water inflow openings face generally downward to limit the amount of floating FOG material that can be drawn in through the openings. The well cover may also include a central bore adapted to receive a standard sized pipe. The pipe can be connected to an outlet from the tank.