C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/04 (2006.01) B01D 1/28 (2006.01)
Patent
CA 2178877
In the evaporation of process wastewater comprising a mixture of different types of wastewater, problems arise due to the formation of reaction products, so-called incrusta- tions, which are difficult to separate. These incrustations clog up the evaporator, thus necessitating frequent stop- pages for chemical and mechanical cleaning of the evapora- tor. The invention concerns an improved method for concen- trating process wastewater by evaporation. In this method, one acid process flow and one alkaline process flow are evaporated alternately in one and the same evaporator. With this method, precipitates that are difficult to separate are dissolved in the evaporator during the respective evapora- tions. As a result, stoppages motivated by the need to clean the evaporator may be avoided to the utmost possible extent, while less and cheaper processing equipment is required.
Eka Nobel Ab
Swabey Ogilvy Renault
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