Laboratory Water Purification System with Automated Flow Control
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Solution Overview
Problem
Current water purification systems using a combination of reverse-osmosis (RO) and electro-deionization (EDI) stages for producing deionized type 2 pure water face challenges such as high water consumption, frequent manual adjustments, and reduced membrane integrity due to varying feed water conditions, leading to increased operational costs and reduced system longevity.
Innovation Solution
A laboratory-scale water purification system that includes a reverse-osmosis device and an electro-deionization module with remote-controlled flow rate regulators and conductivity sensors, allowing for automatic control of permeate flow rate and recovery rate to maintain optimal operating parameters, reducing water consumption and minimizing manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustments are made to control permeate flow rate and recovery rate, then operational flexibility is maintained, but service frequency increases and operational complexity increases
Solution Approach 1:
The system uses conductivity sensors to automatically detect feed water quality changes and adjusts flow rate regulators without manual intervention, allowing the system to self-regulate and maintain optimal recovery rate based on actual water quality conditions
Solution Approach 2:
The system implements a feedback control mechanism where conductivity sensors continuously monitor feed water quality, and the controller automatically adjusts the flow rate regulators based on the detected conductivity changes, creating a closed-loop control system that maintains optimal operating parameters
2Adaptability or versatility
If feed water quality varies, then system adaptability is tested, but membrane integrity deteriorates and system lifespan reduces
Solution Approach 1:
The system dynamically adjusts the recovery rate based on real-time feed water conductivity measurements, allowing the operating parameters to change adaptively with feed water quality variations while maintaining membrane integrity through automated control
Solution Approach 2:
The system changes the recovery rate parameter in response to conductivity changes, automatically adjusting operational parameters to maintain optimal conditions across varying feed water qualities without compromising membrane lifespan
3Productivity
If recovery rate is increased to reduce water consumption, then productivity improves, but system complexity increases and control difficulty increases
Solution Approach 1:
The system replaces manual mechanical adjustment with automated electronic control using conductivity sensors and electronic flow rate regulators, reducing the complexity of manual operations while maintaining precise control over recovery rate for optimized water consumption
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 system effectively reduces water consumption, maintains the integrity of both RO and EDI devices, and requires less frequent service interventions by automatically adjusting to changes in feed water quality, ensuring consistent production of deionized water while extending the lifespan of the purification system components.
Implementation Method 1
a reverse-osmosis device (2) adapted to produce a permeate flow and a concentrate flow from the feed medium
Implementation Method 2
an electro-deionization module (10) having an inlet in fluid communication with the permeate outlet of the reverse-osmosis device (2)
Data Source
AI summary
A method of purifying tap water to produce deionized type 2 pure water on a laboratory scale with a volume of up to 300 l/h using a water purification system, the method including detecting the permeate flow rate produced by a reverse-osmosis device downstream of a permeate outlet; detecting the flow rate of retentate flow that is removed from the system downstream of a first flow rate regulator; and remote controlling the first and a second flow rate regulators based on the detection results from first and second flow meters such that a predetermined target recovery rate and a predetermined target permeate flow rate are controlled.