Calcium Hydroxide Filter Material for Phosphorus Removal
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Solution Overview
Problem
Existing filter materials struggle with poor phosphorus binding and retention, leading to inefficient phosphorus removal from water, and are prone to structural collapse and decreased permeability when exposed to water, requiring complex and costly designs with limited phosphorus retention capacity and long dwell times.
Innovation Solution
A method involving the preparation of a filter material by grinding lightweight aggregate with calcium hydroxide and water to form a concrete-like structure that effectively binds phosphorus, enhancing abrasion resistance and phosphorus retention capabilities, allowing for adjustable granular size, volume weight, and phosphorus retention capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter granule made of burnt lime and ferrous gypsum is used, then phosphor removal capability is improved, but the filter mass collapses when contacted with water due to softening
Solution Approach 1:
The patent uses a composite material consisting of lightweight aggregate (such as expanded clay, slag, or pumice) combined with calcium hydroxide particles. This composite structure provides both the phosphor binding capability of calcium and the structural stability of lightweight aggregate, preventing the collapse issue while maintaining effective phosphor removal.
2Reliability
If calcium is added to lightweight aggregate to form filter medium, then phosphor retention capability is improved, but calcium is washed away with water due to poor binding
Solution Approach 1:
The patent applies preliminary action by mixing calcium hydroxide with lightweight aggregate before the filter material is put into service. This pre-mixing allows calcium particles to be distributed and bound within the aggregate structure in advance, preventing washaway during operation while ensuring phosphor retention capability is established from the start.
3Reliability
If earth filter with multiple layers is used, then water purification is achieved, but the design becomes complicated and expensive requiring large area
Solution Approach 1:
The patent merges multiple functions into a single filter material by combining phosphor binding agents (calcium hydroxide) with structural support materials (lightweight aggregate) in one homogeneous mixture. This eliminates the need for multiple separate filter layers, simplifying the design and reducing the required area while maintaining effective water purification.
4Productivity
If filter material with high phosphor retention capacity is used, then phosphor removal efficiency is improved, but dwell time of water in filter becomes long
Solution Approach 1:
The patent optimizes parameters by controlling the particle size distribution and calcium hydroxide content in the filter material. By adjusting these parameters, the material achieves high phosphor retention capacity through increased surface area and reactive sites, while maintaining appropriate water flow characteristics to minimize dwell time and maximize productivity.
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 filter material achieves high phosphorus retention efficiency, with 90-100% removal in seconds to minutes, improved durability against water flow, and reduced calcium washaway, eliminating the need for separate reagents and allowing for easy replacement and reuse, while maintaining effectiveness over a long service life.
Implementation Method 1
calcium known to have the ability to bind phosphor, to get effectively bound with lightweight aggregate
Implementation Method 2
by the binding of calcium to the lightweight aggregate
Implementation Method 3
by mixing these components by grinding. Surprisingly, the activity of the components used in preparing the filter material, could be increased by grinding
Implementation Method 4
a concrete-like structure was surprisingly obtained for the filter material rendering the filter material highly abrasion resistant
Implementation Method 5
the water to be purified passes through several layers of different materials, the impurities present in the water being bound to the material layers while the water is cleaned
Data Source
AI summary
The object of present invention is a filter material for the preparation of which lightweight aggregate, calcium hydroxide and water has been used, which during the preparation of the filter material have been mixed by grinding. Furthermore, the invention relates to methods for preparing the filter material, a filter cartridge and the use of the filter material for removing phosphor.