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Glossary <br /> • <br /> REFERENCE TERMS <br /> Dilution The reduction of the concentration of a substance in water. <br /> Double walled piping A chemical line with two walls for added protection against <br /> leakage, utilized always when dealing with sulfuric acid. <br /> Drawdown cylinder A cylinder used for the measurement of the <br /> feed rate of a chemical. <br /> Equilization tank A pretreatment process tank for detention of <br /> wastewater flow. This provides a consistent <br /> wastewater stream for more efficient <br /> treatment. <br /> Drawdown cylinder <br /> Filter aid A solid paritulate filter media (perlite) added to the sludge to <br /> improve rates of filtration. <br /> Filter cloths The permeable material that is used in a plate &frame filter <br /> press. <br /> Flocculant A chemical polymer used to join together the fine suspended <br /> particles after coagulation. <br /> Flow rate The rate, expressed in gallons per minute of a liquid passing a <br /> given point. <br /> Flume A calibration device for measuring flow in an <br /> open channel. ` <br /> GASP A modified clarifier used in the pretreatment "T <br /> process. - � <br /> Flume <br /> APPENDIX PAGE 14 <br />