Rotary Disc Filter Bypass Water Integration
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Solution Overview
Problem
Rotary disc filters face challenges in handling bypass water without suspended solids interfering with the backwash system, leading to clogged nozzles and increased maintenance costs due to the need for separate piping and channels.
Innovation Solution
The design integrates a filtered water chamber and conduit within the disc filter to mix bypass water with filtered water, ensuring that only clean filtered water is used for backwashing, preventing clogging and eliminating the need for additional piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bypass water is mixed with filtered water in the disc filter, then installation cost is reduced by eliminating separate piping, but suspended solids in bypass water clog backwash nozzles and upstream strainers
Solution Approach 1:
The disc filter is divided into separate functional zones: a filtration zone where water is filtered, and a bypass zone where bypass water flows separately. The bypass conduit is positioned to receive bypass water below the filter media, preventing mixing with filtered water that would clog backwash nozzles.
Solution Approach 2:
The bypass water flow path is extracted and separated from the filtered water path. The bypass conduit provides a dedicated channel for bypass water that does not intersect with the filtered water chamber or backwash system, eliminating the clogging problem while maintaining cost-effective integration.
2Reliability
If bypass water is separately discharged from the disc filter, then backwash system reliability is maintained, but installation cost increases due to separate piping and concrete channels
Solution Approach 1:
The bypass conduit is merged into the disc filter structure itself, combining the bypass function with the main filter body. This integration eliminates the need for separate external piping and concrete channels, reducing installation cost while maintaining backwash system reliability through proper spatial separation of water paths.
Solution Approach 2:
The disc filter structure serves multiple functions: filtration, bypass water handling, and backwash water storage. The filtered water chamber underlying the filter members serves both as a collection chamber and as the source for backwash water, eliminating the need for separate backwash water storage structures.
3Ease of operation
If filtered water chamber is positioned underlying the disc-shaped filter members, then backwash water is easily sourced from filtered water, but device complexity increases with additional chambers and conduits
Solution Approach 1:
The filtered water chamber is nested within the disc filter structure, positioned underneath the filter members. The bypass conduit is nested within the same structure, extending through the filter body to receive bypass water below the filter media. This nested arrangement integrates multiple functions without significantly increasing external 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
This solution effectively prevents bypass water from entering the backwash system, reducing maintenance costs and simplifying installation by integrating all pipe connections on one end portion of the disc filter, enhancing operational efficiency and ease of installation.
Implementation Method 1
water flows outwardly through filter media disposed on opposite sides of the disc-shaped filter members. Suspended solids in the water are captured on the interior surfaces of the filter media.
Implementation Method 2
A pressurized backwash is sprayed onto the exterior surfaces of the filter media, discharging the suspended solids into a trough disposed in the drum.
Data Source
AI summary
A disc filter includes a filtrate holding tank disposed below a series of disc-shaped filter members supported on a drum. Filtrate from the holding tank is used to backwash filter media on the disc-shaped filter members. Filtrate is discharged from the holding tank via a filtrate conduit. Bypass water is directed through a bypass conduit in the disc filter and mixed with the filtrate downstream of the filtrate holding tank. This assures that the filtrate used to backwash the filter media does not include bypass water.