Operating experience on RO sea water desalination plant at chigasaki laboratory

A demonstration plant with a capacity of 800 m³/d has been operating satisfactorily in Chigasaki Laboratory since September 11, 1979. The plant has two sets of modules, namely hollow fiber and spiral wound types. These two types of modules have been operated alternately every other month, being supplied sea water from the same pretreatment facility and the same high pressure pump. The accumulated operation time of each module has exceeded 5,000 hours. The operation result shows high recovery ratio, low energy consumption and good quality of product water.