Bidirectional Phosphorus Filtration to Prevent Media Clogging
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Solution Overview
Problem
Existing phosphorus removal filtration systems face issues of blocking and hardening in downward flow filtration modes, leading to underutilization of filtration layer capacity and inefficient phosphorus removal.
Innovation Solution
A bidirectional flow pulse-based apparatus that alternates between upward and downward water flow filtration modes, combined with stratified pulse gas flushing, to maintain filtration layer efficiency and prevent blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If downward flow filtration mode is used for phosphorus removal, then phosphorus adsorption capacity is improved, but filtration layer blocking and hardening occur
Solution Approach 1:
The patent implements periodic alternation between downward flow filtration mode and upward flow flushing mode. The downward flow mode performs phosphorus adsorption while the upward flow mode periodically flushes the filtration layer to prevent blocking and hardening, thereby maintaining both high adsorption capacity and reliable operation over extended periods
Solution Approach 2:
The patent introduces upward flow as the inverse of the conventional downward flow mode. By reversing the flow direction periodically, the system prevents the filtration layer from compacting and blocking, thus solving the reliability issue while preserving the adsorption function
2Productivity
If monotonous downward flow filtration mode is used, then phosphorus removal is achieved, but adsorption capacity of lower filtration material cannot be fully utilized
Solution Approach 1:
By introducing upward flow mode that reverses the conventional downward flow direction, the patent enables water to penetrate from top to bottom through the filtration layer, allowing the lower portions of the filtration material to be fully utilized for adsorption, thereby increasing overall productivity and capacity utilization
3Productivity
If filtration layer blocking occurs, then phosphorus removal efficiency decreases, but system complexity increases to prevent blocking
Solution Approach 1:
The patent uses periodic alternation between downward flow filtration and upward flow flushing modes to prevent filtration layer blocking. This simple periodic operation maintains high phosphorus removal efficiency without requiring complex additional devices or structures
Solution Approach 2:
The upward flow mode serves as a self-cleaning mechanism that automatically flushes the filtration layer during operation. The system uses its own flow structure to prevent blocking, eliminating the need for external cleaning devices or complex maintenance systems
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 apparatus effectively prevents filtration layer blocking and hardening, fully utilizes the adsorption capacity of the filtration material, and improves phosphorus removal efficiency, achieving a phosphorus content of ≤0.025 mg/L in treated water.
Implementation Method 1
Adsorption for phosphorus removal is an effective method for deep phosphorus removal
Implementation Method 2
a filtration layer in a downward flow phosphorus removal filtration pool is prone to the problems of blocking and hardening
Data Source
AI summary
A bidirectional flow pulse-based water body phosphorus removal apparatus and a method, and an organic nutrient soil. The water body phosphorus removal apparatus includes: a prefiltration unit, a bidirectional flow phosphorus removal filtration pool, a bidirectional water collection and distribution system, a filtration pool stratified gas pulse system, a water production tank and a control system. A filtration layer filled with a phosphorus removal filtration material is provided in the bidirectional flow phosphorus removal filtration pool. The control system is used for controlling the bidirectional water collection and distribution system to alternately perform upward water in-and-out flow and downward water in-and-out flow on the bidirectional flow phosphorus removal filtration pool, so as to control the bidirectional flow phosphorus removal filtration pool to switch between an upward flow filtration adsorption mode for phosphorus removal and a downward flow filtration adsorption mode for phosphorus removal.