Water Purification Module With UV Recirculation Loop
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Solution Overview
Problem
Conventional water purification systems fail to consistently produce water with total organic carbon (TOC) levels of 2 ppb or less due to the leaching of contaminants from packed bed columns and inefficiencies in UV treatment, leading to accumulation of organics and residual ionic content.
Innovation Solution
A water purification module that recirculates water through a UV radiation treatment device while minimizing circulation through point of use polisher columns, using a pump, UV treatment device, and tank to reduce TOC levels, bypassing ion exchange media and packed beds to prevent contaminant leaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is continuously recirculated through packed bed columns for purification, then ionic contaminants are removed, but organic contaminants accumulate due to leaching from the columns
Solution Approach 1:
The system divides the water circulation into two separate loops: a first recirculation loop that bypasses packed bed columns to minimize organic leaching, and a second recirculation loop that passes through packed bed columns for ionic contaminant removal. This segmentation allows each loop to optimize for its specific function without compromising the other.
Solution Approach 2:
A UV treatment device is introduced as an intermediary component in the first recirculation loop to oxidize and remove organic contaminants that would otherwise accumulate. This mediator enables the system to maintain low TOC levels while still utilizing packed bed columns for ionic purification in the second loop.
2Manufacturing precision
If UV treatment is applied to remove organic contaminants, then TOC levels are reduced, but the treatment is not efficient enough to keep up with contaminant introduction from packed beds
Solution Approach 1:
The system performs preliminary UV treatment on water in the first recirculation loop before it enters the packed bed columns in the second loop. This preliminary oxidation of organics reduces the load on the UV device and prevents organic contaminants from being introduced into the UV-treated water stream, thereby improving overall TOC control efficiency.
3Reliability
If point of use polisher columns are used to minimize ionic contaminants, then water purity is improved, but TOC levels increase due to leaching
Solution Approach 1:
The system segments the purification function by dedicating packed bed columns solely to ionic contaminant removal in the second recirculation loop, while the first recirculation loop handles organic contaminant control through UV treatment. This segmentation prevents the dual-function approach from causing organic leaching into UV-treated water.
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 solution effectively reduces TOC levels to 2 ppb or less, improving the lifespan of packed beds and maintaining water purity by minimizing exposure to contaminant leachates, thus meeting stringent ASTM standards for laboratory-grade water.
Implementation Method 1
an ultraviolet radiation treatment device configured to treat water with ultraviolet radiation
Data Source
AI summary
A water purification module configured to reduce the total organic content of water that flows through a water flow path of a water purification system between an inlet and a first point of use dispenser. The water purification module defines a first recirculation water flow path loop in the water flow path that is in fluid communication with, and forms part of, the water flow path of the water purification system. The water purification module includes a pump, an ultraviolet radiation treatment device, and a tank fluidly connected in the first recirculation water flow path loop such that water that enters the inlet to the water flow path of the water purification system is circulated one or more times through the first recirculation water flow path loop of the water purification module by the pump to generate purified water having a reduced total organic content. The purified water is selectively dispensable from the water purification system at the first point of use dispenser.