Q-Center500-2RE Central Ultra Pure Water System, School of Physics, Peking University

Implementation Plan

• Central preparation system: equipped with Q-Center500-2RE central ultrapure water system, using a two-stage RO+EDI+purification process, with municipal tap water as the inlet and a water production rate of 500 liters/hour, to prepare ultrapure water with a resistivity of 18.25M Ω· cm, which is transported to various experimental areas through a circular pipeline.
• Partition circulation design: Based on the layout of laboratories on different floors of the School of Physics, partition circulation pipelines are set up, equipped with constant pressure water supply systems and UV sterilization devices, to ensure that the water quality in each area's pipeline network is always fresh and stable. Each partition is equipped with an independent circulating pump group, which can intelligently adjust its operation according to water consumption.
• On demand water intake terminal: Install intelligent water intake terminals in each laboratory, supporting functions such as quantitative water intake, real-time water quality display, and card swiping records. For high-end instrument laboratories, a 0.22 μ m terminal filter is configured to meet the requirements of precision analysis experiments.
• Intelligent management system: equipped with an IoT remote monitoring platform, real-time monitoring of the central system and the operation status of each partition, supporting functions such as mobile phone alarm, water usage statistics, and consumable life prediction.

Implementation results

• Improvement in water quality and experimental results: After the system was put into operation, the water quality at each water intake point stabilized and reached a resistivity of 18.25M Ω .cm@25 ℃， TOC＜5ppb， The particle size (≥ 0.2 μ m) is less than 1/ml, which is superior to the first level water standard of GB6682-2008. The success rate and standardization of basic experimental teaching have significantly improved, with a reduction of over 90% in experimental anomalies caused by water quality issues.High end instrument analysis experiments have obtained reliable water source guarantees, and the background interference of ICP-MS, TEM and other equipment has been significantly reduced, supporting the development of multiple innovative experimental projects and providing a solid foundation for the publication of high-level papers.
• Management efficiency and cost optimization: Centralized supply meets the peak water demand of multiple laboratories, and even during peak periods when multiple devices are running simultaneously, water pressure and quality remain stable. Intelligent management reduces 90% of manual maintenance and recording work, allowing researchers to focus more on the experiment itself and no longer be distracted by equipment maintenance. Centralized procurement and specialized maintenance have reduced the average annual consumables and maintenance costs by about 35% compared to the decentralized model, while also freeing up about 15 square meters of laboratory countertop space, making the laboratory layout cleaner and more efficient.

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