摘要 |
<p>The invention relates to a method for treating gaseous discharges which stem from a unit manufacturing an optical-fibre preform and contain germanium. Said method consists of the following steps: preparation of a liquid effluent from the gaseous discharges, followed by precipitation of the germanium in the liquid effluent. According to the invention precipitation is carried out by the addition of magnesium oxide MgO to the liquid effluent.</p> |