Dialysis Permeate Filtration With Demand-Based RO Pump Control
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Solution Overview
Problem
Existing water treatment systems for dialysis, particularly single-station units, face challenges with high energy consumption and noise levels due to continuous operation of pumps, and there is a need for improved efficiency, control, and quality optimization to produce high-purity permeate.
Innovation Solution
A water treatment plant with a reverse osmosis stage and permeate stage connected via a piping system, featuring a permeate tank for intermediate storage, a permeate pump for low-energy circulation, and a sterile filter to ensure purity, with demand-based control of the reverse osmosis pump using fill level measurements, and pressure or flow-controlled permeate pumps for efficient resource use and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reverse osmosis pump operates continuously to ensure permeate production, then permeate availability is improved, but energy consumption increases
Solution Approach 1:
The reverse osmosis pump operates periodically rather than continuously, switching on when permeate is needed and switching off when the tank is full. This periodic operation maintains permeate availability while significantly reducing energy consumption compared to continuous operation.
Solution Approach 2:
The system uses a level sensor to detect the permeate level in the tank and provides feedback to the control unit. When the level reaches a predetermined threshold, the control unit automatically switches off the reverse osmosis pump, preventing unnecessary energy consumption while ensuring permeate is available when needed.
2Reliability
If the reverse osmosis pump operates continuously to maintain permeate supply, then permeate quality is improved, but noise level increases
Solution Approach 1:
The reverse osmosis pump operates periodically based on permeate demand and tank level, remaining silent during idle periods. This periodic operation maintains permeate quality through consistent production when needed while dramatically reducing noise levels compared to continuous operation.
Solution Approach 2:
The level sensor provides feedback to the control unit, which automatically stops the reverse osmosis pump when the tank is full, eliminating noise during idle periods while maintaining quality through controlled operation during demand periods.
3Reliability
If a sterile filter is added to the permeate stage circuit to ensure purity, then permeate purity is improved, but device complexity increases
Solution Approach 1:
The system is divided into distinct functional stages: reverse osmosis stage for bulk purification and permeate stage for final sterilization. The sterile filter is placed specifically in the permeate stage circuit, separating the filtration function from the main reverse osmosis process, which simplifies maintenance and allows independent optimization of each stage.
Solution Approach 2:
The sterile filter acts as an intermediary component between the reverse osmosis membrane and the final permeate output. It provides an additional layer of protection against microbial contamination without interfering with the primary reverse osmosis function, maintaining purity while adding minimal complexity to the overall system.
4Use of energy by moving object
If the reverse osmosis pump is switched off to save energy, then energy consumption is reduced, but permeate production efficiency decreases
Solution Approach 1:
The reverse osmosis pump operates periodically based on actual permeate demand and tank level conditions. This ensures energy is not wasted during idle periods while maintaining efficient production during demand periods, achieving an optimal balance between energy consumption and productivity.
Solution Approach 2:
The level sensor provides real-time feedback to the control unit, which adjusts the reverse osmosis pump operation accordingly. When the tank is full, the pump switches off to save energy; when permeate is needed, the pump activates to maintain efficiency, creating a closed-loop system that optimizes both energy use and 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 system achieves energy efficiency, reduced noise, and high-purity permeate production by adjusting pump operation to demand, ensuring comfort and safety, while minimizing microbial growth and pressure fluctuations.
Implementation Method 1
reverse osmosis pump (103) and a reverse osmosis tank (130), wherein the reverse osmosis tank (130) has an inlet for the process inlet water coming from the reverse osmosis pump (103), a membrane (104) and an outlet for permeate (108)
Implementation Method 2
the permeate stage circuit includes a sterile filter (116), which is preferably arranged downstream of the permeate pump (114) and upstream of the permeate tank (112)
Data Source
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AI summary
Main claim: Water treatment plant for the production of permeate, in particular for dialysis therapy, comprising: • a reverse osmosis stage (137) with a piping system comprising a supply line (131) for process inlet water (100), a reverse osmosis pump (103) and a reverse osmosis tank (130), wherein the reverse osmosis tank (130) has an inlet (143) for the process inlet water (100) coming from the reverse osmosis pump (103), a membrane (104) and an outlet (144) for permeate (108), • a permeate stage (139) with a circulating piping system comprising a permeate tank (112), a permeate pump (114) and a discharge point (134) for connecting at least one consumer or user of permeate (108), wherein the reverse osmosis stage (137) and the permeate stage (139) are connected to each other via a connecting line (138) such that the reverse osmosis stage (137) feeds the permeate stage (139) with permeate (108),and wherein the permeate stage circuit (138) includes a sterile filter (116).