Capacitive Deionisation with Alloy Conditioning for Scale Control
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Solution Overview
Problem
The challenge in water treatment is the management and prevention of scale formation, particularly limescale, which is caused by the precipitation of minerals such as calcium carbonate, leading to reduced efficiency and increased maintenance costs in water systems.
Innovation Solution
A water treatment apparatus combining capacitive deionization and water conditioning elements, where the water conditioning element promotes mineral ion precipitation into a colloidal dispersion, reducing scale formation on capacitive deionization apparatus and enhancing its efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If capacitive deionisation is used to remove dissolved mineral ions from water, then water recovery is improved, but scale formation increases on the apparatus
Solution Approach 1:
A water conditioning element is introduced as an intermediary component between the feed water inlet and the capacitive deionisation electrodes. This element promotes controlled precipitation of mineral ions into a colloidal dispersion, which acts as a mediator to prevent scale formation on the electrodes while allowing high water recovery through the deionisation process
2Manufacturing precision
If capacitive deionisation operates at high TDS reduction (>50%), then purification efficiency is improved, but scale formation on electrodes increases
Solution Approach 1:
The water conditioning element performs preliminary action by promoting precipitation of excess mineral ions into a colloidal dispersion before the water reaches the capacitive deionisation electrodes. This preliminary precipitation removes the harmful scaling potential while allowing the deionisation process to achieve high TDS reduction and purification efficiency
3Productivity
If scale formation is prevented through traditional methods, then apparatus efficiency is maintained, but maintenance requirements increase
Solution Approach 1:
The water conditioning element enables the system to self-regulate scale formation by continuously promoting precipitation into colloidal dispersion. This self-service mechanism maintains apparatus efficiency without requiring external intervention or increased maintenance, as the conditioning element automatically prevents scale adhesion to electrodes
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 combination reduces the risk of scale formation on capacitive deionization apparatus, improves efficiency, and decreases maintenance requirements, while extending its lifespan.
Implementation Method 1
Capacitive deionisation is used to reduce scale formation by removing dissolved mineral ions from the water, using an applied electrical field to move the ions to a capacitive electrode in which the ions are stored
Implementation Method 2
using an applied electrical field to move the ions to a capacitive electrode
Implementation Method 3
water conditioning increases scale formation in the bulk water to prevent adhesion to surfaces, by promoting precipitation of mineral ions into a colloidal dispersion
Data Source
AI summary
There is provided a water treatment apparatus. The apparatus comprises a capacitive deionisation apparatus. The apparatus further comprises a water condition element. The water conditioning element comprises a metal alloy configured such that mineral ions within a flow of water, flowing over a surface of the water conditioning element, precipitate to provide a colloidal dispersion.