Filtration Membrane Cleaning via Temperature-Adaptive Chemical Dosing
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Solution Overview
Problem
Conventional methods for cleaning filtration membranes in membrane filtration devices are inefficient and costly due to temperature-dependent variations in cleaning speed, leading to either insufficient or excessive cleaning, which affects the transmembrane pressure difference and permeation flux.
Innovation Solution
A method involving multiple cleaning steps with adjustable chemical solution concentrations and times based on temperature, using sodium hypochlorite and citric acid solutions to effectively remove organic and inorganic deposits, respectively, while optimizing cleaning efficiency and reducing chemical usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the concentration of chemical solution and cleaning time are adjusted based on transmembrane pressure difference, then cleaning efficiency is improved, but cleaning quality becomes insufficient or excessive depending on temperature
Solution Approach 1:
The invention changes the parameters of chemical solution concentration and cleaning time based on temperature conditions. When temperature is low, higher concentration and longer cleaning time are used; when temperature is high, lower concentration and shorter cleaning time are used. This resolves the contradiction by making the cleaning process adaptive to temperature variations, ensuring reliable cleaning quality while maintaining efficiency.
Solution Approach 2:
The cleaning process is made dynamic by adjusting chemical solution concentration and cleaning time according to real-time temperature measurements. The system transitions from a static cleaning approach (fixed concentration and time) to a dynamic one where parameters change based on operating conditions, thereby maintaining optimal cleaning quality across varying temperatures.
2Reliability
If chemical solution concentration and cleaning time are increased to ensure sufficient cleaning, then cleaning quality is improved, but power consumption and cost increase
Solution Approach 1:
The invention optimizes the parameters of chemical solution concentration and cleaning time based on temperature. At low temperatures, higher concentration and longer time are justified to achieve sufficient cleaning; at high temperatures, lower concentration and shorter time prevent excessive cleaning. This dynamic parameter adjustment ensures cleaning quality is maintained while minimizing unnecessary power consumption and chemical usage.
Solution Approach 2:
The system uses temperature measurement feedback to automatically adjust cleaning parameters, making the cleaning process self-regulating. The temperature measurement unit and control unit work together to determine optimal cleaning conditions without manual intervention, thereby achieving reliable cleaning quality while avoiding excessive energy and chemical consumption.
3Use of energy by moving object
If chemical solution concentration and cleaning time are decreased to reduce cost, then power consumption and cost are reduced, but cleaning quality becomes insufficient
Solution Approach 1:
The invention adjusts chemical solution concentration and cleaning time parameters based on temperature conditions to prevent insufficient cleaning. At low temperatures, the system increases concentration and cleaning time to ensure adequate cleaning effectiveness; at high temperatures, it reduces these parameters appropriately. This ensures cleaning quality is maintained while optimizing power consumption and operational costs.
Solution Approach 2:
The system implements feedback control by measuring temperature and using this information to adjust cleaning parameters. The temperature measurement unit provides feedback to the control unit, which then determines the appropriate chemical solution concentration and cleaning time. This feedback mechanism ensures cleaning quality is maintained while avoiding excessive resource consumption.
4Reliability
If high concentration chemical solution and long cleaning time are used, then cleaning quality is improved, but chemical usage and operational cost increase
Solution Approach 1:
The invention dynamically changes the concentration of chemical solution and cleaning time based on temperature measurements. At low temperatures, higher concentration and longer time are applied to ensure thorough cleaning; at high temperatures, lower concentration and shorter time are used. This prevents excessive chemical usage while maintaining cleaning quality, thereby reducing chemical loss and operational costs.
Solution Approach 2:
The cleaning system automatically adjusts chemical solution concentration and cleaning time based on temperature feedback, making it self-regulating. This eliminates the need for manual optimization and ensures that chemical usage is minimized while still achieving reliable cleaning quality under varying temperature conditions.
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
This approach ensures optimal cleaning of filtration membranes by adjusting chemical solutions according to temperature, preventing insufficient or excessive cleaning, thereby reducing power and cost while maintaining membrane performance.
Implementation Method 1
using a first cleaning step of cleaning the filtration membrane with a first chemical solution and a second cleaning step of cleaning the filtration membrane with a second chemical solution
Implementation Method 2
using sodium hypochlorite and citric acid solutions to effectively remove organic and inorganic deposits, respectively
Implementation Method 3
a water treatment facility uses a membrane filtration device to perform solid-liquid separation for a liquid to be treated
Data Source
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AI summary
Provided is a method for cleaning a filtration membrane provided in a membrane filtration device that is immersed in a liquid to be treated and performs solid-liquid separation on the liquid to be treated. When a transmembrane pressure difference exceeds a first predetermined pressure difference PI, a first cleaning step W1 for cleaning a filtration membrane is performed using a first chemical solution; when the transmembrane pressure difference immediately after performing the first cleaning step W1 exceeds a second predetermined pressure difference P2 that is lower than the first predetermined pressure difference, a second cleaning step W2 for cleaning the filtration membrane is performed using a second chemical solution having a concentration higher than the first chemical solution; and when the second cleaning step W2 is performed, the concentration of the second chemical solution and/or the cleaning time is changed according to the temperature of the liquid to be treated.