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Comment Water Treatment

Industrial-grade salt recovery from zero-liquid-discharge process

By Gerald Ondrey |

A process that increases the water-recovery from reverse osmosis (RO) while producing a salt byproduct is being developed by Hyrec (Urla/Izmir, Turkey; www.hyrec.co). The process, which uses osmotically assisted RO (OARO), could be especially beneficial in coal-to-chemicals (CTC) plants in China, which require large volumes of water, but are in water-stressed regions, says business development specialist Günseli Mendi. The process can also be used for concentrating waste brines generated in other industries, such as textiles, mining, and oil and gas, she says. In OARO (diagram), permeate flows from the high-pressure side to the low-pressure side of the membrane, as in standard RO. However, unlike RO, OARO employs two feed streams. The first feed stream is the same RO feed stream, which is dewatered through the membranes, and leaves the module with increased concentration. Some part of this concentrated stream is then recycled back to the opposite side of the membranes as a second feed stream, diluted through the membranes and leaves the module with decreased concentration. The reduced osmotic-pressure difference between the feed and the permeate sides allows the treatment of ultra-saline feeds at pressures as low as 70 bars. Thus,…
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