Abstract
The Energy Recovery, Inc. (ERI®) PX Pressure Exchanger® energy recovery device recovers hydraulic energy from the high-pressure reject stream from a reverse osmosis (RO) system and transfers it to low-pressure feedwater. Pressurized feedwater from the PX device is sent to the membrane feed, merging with a stream of pressurized water from a high-pressure pump. This significantly reduces the duty of the high-pressure pump. The PX device operates at extremely high efficiency—up to 98% — and itself consumes no electrical power. Therefore, the overall energy consumption of a seawater RO process is cut in half or less compared to a system operating with no energy recovery or by 15 to 30% compared to a system operating with state-of-the-art centrifugal energy recovery devices. In addition, PX technology gives the operator the flexibility to vary the RO system recovery rate to maximize process productivity and energy efficiency over a wide range of feed conditions. The first PX device sold commercially in 1997—th...
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