Composite Filter Material for Stable Water pH Adjustment
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Solution Overview
Problem
Existing filter materials for drinking water treatment, such as those made from half-burnt dolomite, are complex and energy-intensive to produce, and their pH adjustment is not easily tunable, leading to potential pH exceedance and instability in water quality, while alternative materials lack the deacidification properties of half-burnt dolomite.
Innovation Solution
A filter material composed of a first granulate containing calcium carbonate and a second granulate containing magnesium oxide, both with specific bulk densities, is used to achieve stable and efficient deacidification, ensuring pH stability and compliance with drinking water standards through precise pH adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If granulate made from half-burnt dolomite is used for water treatment, then excellent deacidification properties and pH control are achieved, but the manufacturing process becomes complicated, time-consuming, and energy-intensive
Solution Approach 1:
The filter material is segmented into two distinct granulate components: calcium carbonate granulate and magnesium oxide granulate. Each component is produced separately through simple calcination processes rather than the complex half-burnt dolomite process, then combined in a mixed filter material to achieve the desired deacidification properties.
Solution Approach 2:
The invention creates a composite filter material by combining calcium carbonate granulate and magnesium oxide granulate in specific ratios (1:4 to 4:1). This composite approach replicates the excellent deacidification properties of half-burnt dolomite while using simpler, more energy-efficient manufacturing processes for each component.
2Reliability
If half-burnt dolomite granulate is used, then excellent reactivity profile is achieved, but further pH adjustment is not possible in a simple way
Solution Approach 1:
The filter material design enables dynamic pH adjustment by allowing flexible modification of the calcium carbonate to magnesium oxide ratio in the mixed granulate. This dynamic composition adjustment provides adaptability for different pH control requirements while maintaining excellent reactivity through the complementary action of the two components.
3Ease of manufacture
If calcium carbonate granulate is used, then simplicity of manufacture is achieved, but the material is not reactive enough for certain applications
Solution Approach 1:
The invention merges calcium carbonate granulate and magnesium oxide granulate in a mixed filter material. This combination preserves the manufacturing simplicity of producing each component separately through straightforward calcination processes while achieving enhanced reactivity through the synergistic interaction of the two materials.
4Reliability
If magnesium oxide granulate is used, then high reactivity is achieved, but the pH value of water exceeds acceptable limits
Solution Approach 1:
The calcium carbonate granulate acts as a preliminary anti-action to the excessive pH-raising effect of magnesium oxide granulate. By pre-combining these two components in controlled ratios, the system prevents pH exceedance of acceptable limits while maintaining the high reactivity benefits of magnesium oxide through its balanced interaction with calcium carbonate.
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 provides stable deacidification and pH control, meeting drinking water quality requirements, with a homogeneous mixture that maintains consistent reactivity over time, effectively removing impurities and remineralizing water.
Implementation Method 1
Filter materials that usually contain mineral constituents are used to deacidify the water. Filter materials that contain calcium carbonate and/or magnesium oxide are of particular importance here.
Implementation Method 2
The filter material provides stable deacidification and pH control, meeting drinking water quality requirements, with a homogeneous mixture that maintains consistent reactivity over time, effectively removing impurities and remineralizing water.
Data Source
AI summary
A first filter material for water treatment comprising a first granulate containing calcium carbonate and a second granulate containing magnesium oxide, wherein the first and the second granulate each independently having a bulk density of 1.00 to 1.40 t/m3; a second filter material for water treatment comprising 55 to 85 wt. % of a first granulate containing calcium carbonate and 15 to 45 wt. % of a second granulate containing magnesium oxide, in each case based on the sum of the amounts of the first and the second granulate; a method for manufacturing the filter material; a filter containing the filter material; a use of the filter material for treating water; and a water treatment method are described.