evaporation evapx


Low Energy Evaporation and Crystallisation

Evaporation and Crystallisation Plant, China

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Clean TeQ Water provided the engineering, procurement and construction of a 12.5 m3/h ZLD evaporation and crystallisation plant for RO brine in Yulin, China.


The customer was a comprehensive park established in 2009 with the approval of the government to form a self-contained system including closed management, high independency and high self-development. The park is divided into two areas: the south area is a coal chemical plant (MTO) and salt chemical production, and the north area is designated to coal liquefaction.

The EVAPX® input stream comes from concentrated water from reverse osmosis treating wastewater from the south area, with a TDS above 100,000 ppm and a COD concentration above 1,000 ppm. The heat input for the EVAPX® system is an electrical heat pump, and the plant achieves zero liquid discharge from the reverse osmosis brine. The low temperature and ambient pressure evaporation used in EVAPX® greatly reduces the amount of volatile chemicals in the distillate compared to other evaporation technologies.

Typical Water Quality for an EVAPX® Plant

Parameter Unit Feed Water Product Water
TDS ppm > 100,000 < 100
COD ppm 1,000 10
NH3-N ppm 30 < 30
pH - 4 6 – 8


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