Devices to harvest kinetic energy from the briny waste stream of seawater desalinization plants are to be used for the first time at an industrial scale in two plants now being built in Spain. Image: Courtesy Of Energy Recovery Inc. A kinetic energy exchanger (lower right) recaptures water-pressure energy in the outflow stream and transfers it back into the raw-water stream. Pressure-exchange devices supplied by Energy Recovery Inc., San Leandro, Calif., are to be installed in reverse-osmosis plants being built by Spain’s Ministry of the Environment, Rural and Marine Affairs at the Mediterranean coastal cities of Moncofa and Oropesa. Together,
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.