Thermic&NG Power Plants

Nuclear power plants require a limited value of dissolved silicon content in boron-containing
water system of primary circuit. When the silicon content of the primary boron containing water system exceeds the safety limit, the boron-containing water system needs to be purified and the silicon concentration should be reduced to the safety limit, so as to ensure the safe operation of units. The chemical and physical properties of dissolved silicon are very close to those of boric acid, making it very difficult to separate dissolved silicon from boric acid. Due to strict water quality requirements in nuclear power plant, impurities cannot be introduced while removing dissolved silicon. At the same time, it is necessary to ensure a high recovery rate of boric acid
and control the generation of waste from nuclear power plants.

The application of nanofiltration membrane technology can reduce the silicon concentration in the boron containing water system to a safe limit (<500ppb), while minimizing the discharge of waste liquid as much as possible to ensure stable boron concentration in the system.