Analysis of the process flow of ultra-pure water machine

Introduction

Ultrapure water: It not only removes the conductive medium in the water almost completely, but also removes the non-dissociated colloidal substances, gases and organic substances in the water to a very low level. The resistivity is greater than 18MΩ*cm, or close to the limit value of 18.3MΩ*cm. Ultrapure water is a level that is difficult to achieve by general processes. It adopts four major steps: pretreatment, reverse osmosis technology, ultra-purification treatment and post-treatment, multi-stage filtration, high-performance ion exchange unit, ultrafiltration filter, ultraviolet lamp, In addition to various treatment methods such as TOC devices, the resistivity can reach 18.25MΩ*cm.

Ultrapure water is the water produced by the American scientific and technological circles in order to develop ultrapure materials (semiconductor original materials, nano fine ceramic materials, etc.) by applying distillation, deionization, reverse osmosis technology or other appropriate supercritical fine technology. Except for water molecules (H20), there are almost no impurities, and there are no bacteria, viruses, chlorinated dioxins and other organic substances. many ions.

process flow

1. Pretreatment system→reverse osmosis system→intermediate Water Tank→coarse mixed bed→fine mixed bed→pure Water Tank→pure water pump→ultraviolet sterilizer→polished mixed bed→precision filter→water object (≥18MΩ.CM) (traditional craft)

2. Pretreatment→reverse osmosis→intermediate Water Tank→water pump→EDI device→purified Water Tank→pure water pump→ultraviolet sterilizer→polishing mixed bed→0.2 or 0.5μm precision filter→water object (≥18MΩ.CM) (new process )

3. Pretreatment→first stage reverse osmosis→dosing machine (PH adjustment)→intermediate Water Tank→second stage reverse osmosis (positive charge reverse osmosis membrane)→pure Water Tank→pure water pump→EDI device→ultraviolet sterilizer→0.2 or 0.5μm precision filter → water object (≥17MΩ.CM) (new process)

4. Pretreatment→reverse osmosis→intermediate Water Tank→water pump→EDI device→pure Water Tank→pure water pump→ultraviolet sterilizer→0.2 or 0.5μm precision filter→water object (≥15MΩ.CM) (new process)

5. Pretreatment system→reverse osmosis system→intermediate Water Tank→pure water pump→coarse mixed bed→fine mixed bed→ultraviolet sterilizer→precision filter→water object (≥15MΩ.CM) (traditional process)

Each of the above processes has its own advantages, and you can choose the process that suits you according to your own situation. With the development of science, many new processes have replaced the old ones.