Abstract
Distilled water produced from MSF plants is a very soft water that has a low buffer capacity, and as such, is considered quite aggressive to the materials encountered in the water distribution system. Furthermore, this untreated water is not accepted from a palatability point of view. Different remedial treatment processes are therefore being adopted by different MSF plants. In Kuwait, a recarbonation process has been in operation for 18 months at Shuwaikh Desalination Plant treating 18 MIGD of distilled water as the first step in a major scheme aimed at treating water produced by all MSF plants in Kuwait. The major steps in the adopted recarbonation process include extraction of carbon dioxide from the vent gas system of the MSF plant, compression and purification of CO 2-air gas stream, acidification of a pre-calculated distilled water stream in a gas absorption tower, limestone dissolution to augment the water with Ca 2+ and HCO - 3 necessary for water to be self-inhibiting, degasification of the excess CO 2, blending with by-passed distilled water and finally pH adjustment. This paper presents some engineering design aspects of the different steps encountered in the recarbonation process as well as an analysis of plant operation experience gained during the last 18 months.
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