Laboratory system engineering_Laboratory pure water system
Today, water environment is the most basic environment for most laboratories, occupying a very important position in experiment. Water quality often determines the authenticity repeatbility of the results of many experiments . Most experts in laboratories usually require t hat concentration of impurity elements chemical compounds in pure water are in ppb level even lower. In the laboratory scientific research field, the starting point of purification that people focus on is tap water. If there is ditilled water, deionized water reverse osmosis water in laboratory, people will then only focus on the process of super purification.
Classification of pure water in laboratory/實驗室純水的分級
Level I1 pure water : Physical purity of level II pure water is generally less than 50uS/cm. Distilled water ,double disilledwater(DDW) , ordinary deionized water reverse osmosis water all belong to this level. It is usually made through purification of tap water . Its main applications are in these fields,such as cleaning bottles dishes, used for high pressure disinfection device, used in artificial environment used in supply of ultra-pure water puritfier.
Levelll pure water: Levell pure water has a fuzzy range, often denoted by 5-15M-cm. But it does necessarily stricty limit to this range. Ranging of 1-17M-cm can be considered as Level II pure water. It is made through ion exchange electrodialysis of level II pure water. It's mainly used in ordinary reagents compounding, ordinary chemistry experiment water supply for ultra-pure water meter.
Levell pure water: Level I pure water refers to water with physical purity more than 1 8M-cm, we usually take resistivity of 18.2M-cm as the index of level I pure water. Level | pure water must be made through re- purification of level II pure water level II pure water by nuclear level ion exchange resin. It is mainly used in analysis experiments requiring high precision life science experiment with high purity requirements for water.
Laboratory pure water supply mode/實驗室純水供應模式
Central pure water supply mode/中央純水供應模式
Central pure water supply mode refers to setting pure water production device.Water for laboratory use is transported to each water demanding point through water supply pipelines , providingdirect access to laboratory pure water ultrapure wate , whether it is a single laboratory an experimental building.
1.Lower running cost，centralized management.
2.Collective use , no possibility of machine standing idle.
3.Large production , water is delivered by pipe network。many water supply points in one laboratory.
The system must ensure long-term safe operation,otherwise there will exist water-breaking risk.
Decentralized water supply mode/分散純水供應模式
Decentralized water supply mode refers to setting water purification machine purified water on each water supply point of laboratory.
People have independent access to instruments, instruments have high utilization ratio.
1.Operating cost is high.management is decentralized, consumption costis relatively higher.
2.Fixed-point installation on desk,fixed water supply points.Small production,low flow-rate low efficiency.
3.If each experimental group purchases separately,then the total amount of investment on this product will be very high, will result in vacancy rate increasing with the difterent working conditions of each experimental group, proving unfavorable for the maximization of investment efficiency.
With the development of laboratory equipment, pipe network centralization of laboratory pure water supply have become the developing direction of large scale experimental buildings.