Multi-Chamber FOG Separation for Continuous Wastewater Treatment
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Solution Overview
Problem
Existing methods for removing Fats, Oil, or Grease (FOG) from wastewater are inefficient, leading to pipe blockages, environmental contamination, and health hazards, and require frequent maintenance of grease traps, which are not practical for continuous operation.
Innovation Solution
A FOG separator apparatus with multiple reservoirs and a syphon and pump system that exploits the natural stratification of FOG and water, using sensors and heaters to separate and concentrate FOG, and a modular design for continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grease traps are pumped on a monthly or weekly basis, then operational costs are reduced, but significant portions of grease will break down and turn septic causing BOD and COD increase
Solution Approach 1:
The system divides the FOG collection process into multiple stages using three separate reservoirs (first, second, and third reservoirs) connected by weirs. Each reservoir serves a specific function: initial collection, concentration, and final separation. This segmentation allows continuous operation while maintaining high FOG concentration and preventing septic breakdown that would occur in single-stage systems with longer retention times.
Solution Approach 2:
The system enables continuous FOG separation through a multi-reservoir design with automatic pumping. While the FOG pump operates intermittently based on sensor triggers, the overall separation process continues without interruption as wastewater flows through multiple reservoirs simultaneously. This continuous action prevents the stagnation and septic breakdown that occurs in batch-operated grease traps.
2Ease of operation
If grease traps are not pumped frequently, then operational costs are reduced, but FOG accumulates and restricts flow causing pipe blockages
Solution Approach 1:
The system incorporates sensors (such as capacitive sensors) in the third reservoir that continuously monitor FOG concentration or liquid level. When the sensor detects that FOG concentration reaches a predetermined threshold, it triggers the FOG pump to activate and remove accumulated FOG. This feedback mechanism enables the system to maintain optimal flow capacity automatically without requiring frequent manual intervention or pump-outs.
Solution Approach 2:
The system performs self-monitoring and self-regulation of FOG accumulation through automatic sensor-based pump activation. The sensors detect FOG levels and automatically trigger the pump when thresholds are reached, eliminating the need for manual monitoring and frequent maintenance pump-outs that would be required in conventional grease traps.
3Productivity
If multiple reservoirs and sensors are added to achieve continuous separation, then FOG removal efficiency is improved, but device complexity increases
Solution Approach 1:
The system utilizes passive hydraulic principles through weir structures to automatically control flow between reservoirs based on liquid level differences. The weirs create automatic overflow mechanisms that require no mechanical actuation, simplifying the overall system control while maintaining efficient FOG separation through the multi-reservoir configuration.
Solution Approach 2:
The system employs sensors that detect changes in physical parameters (such as capacitance, liquid level, or FOG concentration) to trigger pump activation. By monitoring parameter changes rather than using complex mechanical switches or manual controls, the system achieves automated operation with relatively simple sensing components, balancing separation efficiency with manageable device complexity.
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
Effectively separates and concentrates FOG from wastewater, reducing pipe blockages and environmental contamination, while minimizing maintenance and operational costs through continuous operation and efficient FOG removal.
Implementation Method 1
a syphon arrangement having a syphon inlet provided in the third reservoir at a first level and having a syphon outlet provided outside the third reservoir at a second level which is higher than the first level
Implementation Method 2
a pump arrangement comprising a FOG pump and a sensor provided in the third reservoir at a third level which is higher than the second level
Implementation Method 3
The sensor may be in the form of a capacitive sensor
Implementation Method 4
The FOG separator apparatus may include one or more heaters. The heaters may be provided in one or more of the first reservoir, the second reservoir, and/or the third reservoir
Data Source
AI summary
A FOG (Fats, Oil, or Grease) separator apparatus includes (1) a first reservoir or chamber having a wastewater inlet configured to receive wastewater containing FOG; (2) a second reservoir or chamber which is separated from the first reservoir by a first 5 weir configured to permit overflow of at least FOG from the first reservoir to the second reservoir; and (3) a third reservoir or chamber separated from the second reservoir by a second weir configured to permit overflow of at least FOG from the second reservoir to the third reservoir.