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2.1.6 Carbon Columns <br />Two carbon columns are connected in parallel and are designed to be <br />operatedsimultaneously (Figure 2.9). Do not attempt to operate the retort with only one <br />carbon column. <br />The carbon contained in the columns is a sulfur treated carbon capable of adsorbing up to <br />83% of its weight in mercury. However, the columns are designed for 20% loading. Any <br />mercury vapour which was not condensed in the collector and aftercooler will be collected <br />in the carbon columns. <br />Figure 2.9 — Typical Carbon Columns <br />2.1.7 Air Filter <br />An inline air filter(Figure 2.10) is located in-line between the aftercooler and the carbon <br />columns. This filter provides collection of fine particulates. The filter is easily accessible <br />for maintenance. <br />Figure 2.10 - Typical Air Filter <br />20