Before a sludge sample is transported to the analyzer, the environmental engineer must determine if the information of interest is in the liquid or solids phase of the sludge. If only the liquid phase must be monitored, solids can be removed from the sample by self-cleaning filters (see Figures 7.8.2 and 7.8.3). When a sample is collected over a long time period, intermittent sample collectors should be used for monitoring (see Figure 7.8.5).
If the information is in the solids phase and a sampling system is used, the size of the solid particles must be reduced through homogenization (see Figure 7.8.4). Once the slurry is liquified, it can flow through the sampling system without plugging it.
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