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China is a vast country with numerous industries, and customers in different regions have vastly different sources of water quality and water usage needs. Therefore, there are often different selection and combination methods for the three subsystems that make up an ultrapure water system—water pretreatment system, reverse osmosis system, and fine treatment system. The ultrapure water system series launched by various manufacturers based on differences in effluent water quality cannot fully cover the individual needs of different customers. Therefore, we provide this selection guide for your reference, hoping to help you choose the best cost-effective laboratory water solution.
Table of the influence of source water quality on RO effluent quality and filter replacement cycle
Source water quality (TDS) | 100-200ppm | 200–350 ppm | 350～500ppm | >500ppm |
Water pretreatment | Standard configuration | Enhanced | Add a water softener | Add a water softener |
RO membrane water production capacity (tons/unit) | 20-30 | 10～20 | 5～15 | 4～10 |
Conductivity of single-stage RO pure water (µs/cm) | 3-6 | 6～12 | 15-30 | >30 |
Conductivity of secondary RO pure water (µs/cm) | 1～2 | 2-5 | 5-10 | >10 |
Single-stage RO desktop unit Water production capacity of purification column (liters/set) | 4000～6000 | 2000-3000 | 1000～1500 | <1000 |
Single-stage RO floor-standing unit Water production capacity of purification tank (tons/set) | 10-15 | 6～10 | 3-5 | <3 |
I. Selection of Water Pre-processor:
A water pre-processor can improve the quality of the source water, extend the service life of the subsequent RO membrane, and avoid frequent replacement of the expensive RO membrane. When the source water quality is poor (especially above 400ppm) and the consumption of pure water is large, a fully automatic water softener should be considered; otherwise, the RO membrane will need to be replaced frequently due to scaling.
II. Main Unit Selection:
As can be seen from the table above, the RO pure water quality is correspondingly poor when the source water quality is poor. If the RO pure water quality cannot meet the needs of laboratory teachers, they will only be able to use UP ultrapure water, which leads to frequent replacement of UP purification columns and increases the cost of use. In this case, the following two solutions can be considered:
(1) Modify the single-stage RO system into a dual-stage RO system, which can significantly improve the RO pure water quality to meet the water quality requirements of experimental water;
(2) Select a UPL floor-standing ultrapure water system. UPL floor-standing ultrapure water system has been technologically innovated and is equipped with a purification tank that allows customers to replace the resin themselves, replacing the disposable purification columns used in benchtop ultrapure water systems . The purification tank contains more than 10 liters of finely mixed resin, and the effect is equivalent to about 25 ordinary purification columns (resin filling volume is about 0.4 liters/column). However, the cost of replacing 10 liters of resin (about 1,000 yuan) is only equivalent to the cost of replacing 7 to 8 purification columns. Compared with the use of traditional benchtop ultrapure water systems , UPL floor-standing ultrapure water systems can save you more than 60% of consumable costs.
