Detailed Explanation of Ultrapure Water Equipment Technology and Characteristics in Solar Photovoltaic Industry

I. Solar Photovoltaic Ultrapure Water System Process:

• Pretreatment system → Reverse osmosis system → Intermediate water tank → Coarse mixed bed → Fine mixed bed → Pure water tank → Pure water pump → Ultraviolet sterilizer → Polishing mixed bed → Precision filter → Water user (≥18MΩ.CM) (Traditional process)

• Pretreatment → Reverse Osmosis → Intermediate Water Tank → Water Pump → EDI Unit → Purified Water Tank → Pure Water Pump → Ultraviolet Sterilizer → Polishing Mixed Bed → 0.2 or 0.5μm Precision Filter → Water Target (≥18MΩ·CM) (Latest Process)

• Pretreatment → First-stage reverse osmosis → Dosing machine (pH adjustment) → Intermediate water tank → Second-stage reverse osmosis (positively charged reverse osmosis membrane) → Pure water tank → Pure water pump → EDI device → Ultraviolet sterilizer → 0.2 or 0.5μm precision filter → Water user (≥17MΩ·cm) (Latest process)

• Pretreatment → Reverse Osmosis → Intermediate Water Tank → Water Pump → EDI Unit → Pure Water Tank → Pure Water Pump → Ultraviolet Sterilizer → 0.2 or 0.5μm Precision Filter → Water User (≥15MΩ.CM) (Latest Process)

• Pretreatment system → Reverse osmosis system → Intermediate water tank → Pure water pump → Coarse mixed bed → Fine mixed bed → Ultraviolet sterilizer → Precision filter → Water user (≥15MΩ.CM) (Traditional process)

II. Features of Ultrapure Water Equipment in the Solar Photovoltaic Industry

To meet user needs, achieve standard-compliant water quality, minimize contamination at each stage, extend equipment lifespan, and reduce operator maintenance workload, the process design uses water meeting national tap water standards as the source water. It is further equipped with a pretreatment system including a media filter, activated carbon filter, sodium ion softener, and precision filter; an RO reverse osmosis main unit system; and an ion exchange mixed bed (EDI electro-desalination system) system. The system is equipped with a liquid level control system for all water tanks, a pressure protection device for all water pumps, online water quality monitoring and control instruments, and a PLC programmable controller for electrical systems, achieving true unattended operation. At the same time, the selection of process materials adopts a method that combines recommendations and customer requirements, making the equipment more cost-effective and reliable compared with other similar products.