Diffuser Baffle for Grease Interceptor Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing grease interceptors face challenges in efficiently separating fats, oils, and grease (FOG) from wastewater without creating turbulent flow, which can lead to FOG entering the sanitary sewer system, and they are often difficult to clean.
Innovation Solution
A directional diffuser baffle is introduced for in-line wastewater grease interceptors, featuring an open bottomed design with a deflector portion and apertures that create a low flow velocity, high air entrainment, and extended residence time to separate FOG from wastewater, while being easy to clean and maintain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deflector plates are used to increase separation of grease, then FOG separation is improved, but the device becomes difficult to clean
Solution Approach 1:
The baffle is segmented into multiple functional zones: an upper deflector portion for directing flow, a lower diffuser portion with apertures for flow distribution, and a removable design that allows easy cleaning. This segmentation allows each portion to perform its specific function while maintaining overall cleanability.
Solution Approach 2:
The baffle is designed to be removable and replaceable, transforming a static cleaning problem into a dynamic maintenance solution. The baffle can be easily removed from the grease interceptor for cleaning or replacement, making maintenance simple without requiring disassembly of the entire interceptor.
2Reliability
If radically modified flow of wastewater is used to increase separation of FOG, then FOG separation is improved, but turbulent flow is created which erodes trapped grease
Solution Approach 1:
Different portions of the baffle provide different flow characteristics: the deflector portion creates gentle flow direction changes, while the diffuser portion with apertures creates localized low-velocity flow patterns. This local quality control prevents turbulent flow throughout the system while maintaining effective separation.
Solution Approach 2:
The baffle changes flow parameters by reducing velocity and directing flow through specific paths. The apertures in the diffuser portion create numerous small flow streams instead of one large turbulent stream, changing the flow regime from turbulent to laminar or transitional flow that prevents grease erosion.
3Reliability
If fixed deflector plates are used for FOG separation, then separation efficiency is improved, but maintenance and cleaning become difficult
Solution Approach 1:
The baffle is designed as a removable component that can be easily taken out for cleaning or replacement. This dynamic maintenance approach contrasts with fixed designs that require complex disassembly, making the system easier to maintain while preserving the separation efficiency provided by the deflector and diffuser structures.
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 diffuser baffle effectively separates FOG from wastewater, reducing the risk of turbulent flow and facilitating easy cleaning, thereby enhancing the efficiency of grease interceptor operations and compliance with regulatory requirements.
Implementation Method 1
establish a flow pattern with a low flow velocity, high air entrainment and high residence or transition time
Implementation Method 2
allow fats, oils and grease to float to the surface of the container where they can be skimmed off
Data Source
AI summary
A diffuser baffle for use in an in-line wastewater grease interceptor. The diffuser baffle lies within a grease collecting chamber between the inflow and outflow of a grease interceptor. The diffuser baffle has an open bottom which is sized and shaped respectively to fit into the grease collecting chamber. The diffuser baffle has an end operatively connected to the inflow opening to permit wastewater to flow into the body through the open bottom. The baffle has a downstream end which includes a deflector portion to deflect a wastewater stream in a direction generally into the grease collecting chamber. The body also includes a number of apertures to permit the deflected wastewater stream to pass through the baffle and into the grease collecting chamber, where FOG will separate before waste water exits the chamber through the outlet baffle.