Filter Medium Layer Depth Filtration via Segmented Grading
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Solution Overview
Problem
Current filter devices face challenges in efficiently utilizing the entire filter medium layer for solid-liquid separation, leading to increased filtration pressure and frequent cleaning due to surface filtration, and require selection of specific filter media based on the liquid being treated, which complicates production and inventory control.
Innovation Solution
A filter medium layer is created by mixing filter media and filtering aids, allowing suspended solids to pass through the filtering aids and be captured throughout the filter medium layer, thereby enabling effective depth filtration and extending filtration duration without the need for media selection based on the liquid's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface filtration is performed with narrow flow passages in the filter medium layer, then suspended solids are captured on the surface, but filtration pressure rises quickly and the filter medium layer is not effectively utilized
Solution Approach 1:
The filter medium layer is designed with spatially varying properties: the upper portion has smaller颗粒尺寸 to capture suspended solids, while the lower portion has larger颗粒尺寸 to maintain flow passages. This local differentiation allows the surface to perform effective filtration while the deeper layers prevent pressure buildup, resolving the contradiction between separation efficiency and pressure control
Solution Approach 2:
The filter medium layer is segmented into multiple layers with different颗粒 characteristics. The upper layer uses fine颗粒 for effective solid capture, while the lower layer uses coarse颗粒 to maintain open flow passages. This segmentation allows each layer to perform its specific function, preventing the pressure rise that would occur in a uniformly fine-structured filter
2Quantity of substance
If the entire filter medium layer is effectively utilized for depth filtration, then a large amount of solids are captured per cycle, but flow passages must be formed deep inside the filter medium layer which is difficult to maintain
Solution Approach 1:
The filter medium is divided into upper and lower portions with distinct functions. The upper portion captures suspended solids through surface filtration, while the lower portion maintains open flow passages to enable depth filtration. This segmentation simplifies the overall structure by concentrating the flow passage maintenance function in the lower layer, making it easier to preserve depth filtration pathways
Solution Approach 2:
Different regions of the filter medium are assigned different structural properties: the upper region has fine颗粒 for solid capture, while the lower region has coarse颗粒 with larger inter-particle spaces to maintain flow passages. This local quality differentiation enables the system to achieve both high solid capture capacity and maintained flow passages without complex structural design
3Reliability
If filter media are selected based on the liquid to be treated, then filtration performance is optimized, but production and inventory control become complicated
Solution Approach 1:
The filter medium employs a universal two-layer structure that can handle various types of suspended solids and liquid flows. The upper layer's fine颗粒 provides general solid capture capability, while the lower layer's coarse颗粒 maintains flow passages for different applications. This multi-functional design eliminates the need to select different filter media for different liquids, simplifying inventory and selection while maintaining reliable filtration performance across diverse applications
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 configuration ensures efficient filtration across the entire filter medium layer, reducing filtration pressure and frequency of cleaning, and allows for application to various liquids without changing filter media specifications, optimizing filtration performance and duration.
Implementation Method 1
a filter medium layer for separating and removing suspended solids contained in a liquid to be treated (raw water)
Data Source
AI summary
A filter medium layer includes filter media configured to capture suspended solids contained in a liquid to be treated and filtering aids configured to allow the suspended solids contained in the liquid to be treated to pass through the filtering aids. The filter media and the filtering aids are mixed together and the liquid to be treated is filtered by being passed through the filter media and the filtering aids as mixed together. A filter device includes the filter medium layer and a filter tank configured to accommodate the filter medium layer.