Dishwasher Final Rinse Using Reverse Osmosis at Low Temperature
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Solution Overview
Problem
Existing dishwashing methods face challenges in achieving hygienic cleanliness at low final-washing temperatures, either being energy-inefficient or causing adverse effects on washware and the environment, and often result in lingering odors from disinfectants.
Innovation Solution
A method and apparatus that divide the final-washing process into two substeps, using a first rinse liquid with a disinfectant at low temperatures followed by a second rinse liquid produced through reverse osmosis, which is ultrapure and free of rinse agents, to ensure effective hygiene and residue-free drying without thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature rinsing is used to achieve hygienic cleanliness, then hygiene effect is improved, but energy consumption increases
Solution Approach 1:
The final-washing process is divided into two separate substeps: first a low-temperature rinse with disinfectant, then a low-temperature rinse with reverse osmosis water. This segmentation allows achieving hygiene through chemical means rather than thermal means, thereby reducing energy consumption while maintaining hygiene effectiveness.
2Use of energy by moving object
If low temperature rinsing with disinfectant is used, then energy consumption is reduced, but odor absorption by washware occurs
Solution Approach 1:
Reverse osmosis water is introduced as an intermediary substance between the disinfectant rinse and the final state of the washware. This ultra-pure water rinses away residual disinfectant that causes odors, while being so pure that it prevents spotting and drying residues, thus eliminating the harmful odor effect without compromising the energy efficiency of low-temperature operation.
3Device complexity
If traditional rinsing systems are used, then simplicity is maintained, but water consumption increases
Solution Approach 1:
The system recovers and reuses water from the final-washing circuit for the reverse osmosis treatment. By directing this water through a reverse osmosis device, the system produces ultra-pure rinse water that consumes less overall water while maintaining simplicity through integrated water recovery and reuse mechanisms.
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 combines the hygiene benefits of thermochemical methods with the energy efficiency of high-temperature rinsing, reducing water consumption, and preventing odor absorption by washware, while ensuring residue-free drying and meeting environmental standards.
Implementation Method 1
a reverse-osmosis device (368) is provided which is designed to separate water into a permeate and a concentrate
Implementation Method 2
The first rinse liquid (338) contains a disinfectant
Data Source
AI summary
A method and apparatus for cleaning washware, in particular dishes, is provided. In the process, the washware is subjected to at least one wash process in which adhering dirt is at least largely removed. The washware is then subjected to a final-washing process which has at least two substeps. The washware is acted on by a first rinse liquid in a first substep, with the first rinse liquid containing a disinfectant. The washware is acted on by a second rinse liquid in a subsequent second substep, with the second rinse liquid comprising at least one permeate which is produced by reverse osmosis.