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Comment Water Treatment

Zero-liquid-discharge project to recover products from brine

By Gerald Ondrey |

HRS Heat Exchangers Ltd. (Watford, U.K.; www.hrs-heatexchangers.com) was recently awarded an order for the design, manufacture and installation of a mechanical vapor recompression (MVR) evaporation system for LIFE Desirows (lifedesirows.eu) — a three-year, €1.6-million project funded under the E.U.’s LIFE19 program. LIFE Desirows, which involves a consortium of companies and the Polytechnic University of Cartagena (UPCT; Spain; www.upct.es), aims to demonstrate a circular economy, zero-liquid discharge (ZLD) project to improve water quality in the Murcia region of Spain. The consortium has developed a process (diagram) that removes nutrients and separates different salts from agricultural brine, so that they can be used as fertilizers. First, a double reverse-osmosis (RO) process generates a second brine, which then undergoes denitrification and chemical precipitation processes to remove the nutrients and the salts. The resulting solution is then thermally concentrated using a cooling tower and MVR to produce a saturated solution. Finally, the precipitated salts are removed from this saturated solution using wind-aided intensified evaporation (WAIE), providing a true zero-liquid discharge solution that converts the environmentally…
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