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Glossary <br /> OF <br /> REFERENCE TERMS <br /> Coagulant A chemical polymer used to neutralize the charge of suspended <br /> solids . <br /> Coalesced The process of bringing the oil together to be removed in the <br /> Oil/water separator. <br /> Compliance monitoring The collection and evaluation of data , including self monitoring <br /> reports . This data is used to verify whether pollutant <br /> concentrations are within the discharge limits . <br /> Composite sample A representative water or wastewater sample made up of <br /> individual smaller samples taken at periodic intervals <br /> throughout a specified time period . <br /> Concentration The amount of solute present in proportion to the total solution . <br /> A measure of the average density of pollutants or other <br /> constituents usually specified in terms of mass per unit volume <br /> of water. <br /> DAF Dissolved Air Floatation — a process where <br /> air is dissolved into a liquid that is to be <br /> treated , forming small bubbles that attach to <br /> suspended solids . These bubble , along with <br /> the suspended solids , then float to the <br /> surface and are removed by skimming . <br /> DAF skid <br /> Day tank Any storage tank that is used to hold a <br /> smaller quantity of chemicals than what is <br /> held in a bulk tank . Generally day tanks hold <br /> between one and five days ' worth of <br /> chemicals . <br /> H <br /> Day tank <br /> Dewatering equipment Equipment that is used to extract a portion of <br /> the water present in a sludge , producing a <br /> dewatered filter cake which is then disposed <br /> of in a landfill . Two common types are the <br /> plate & frame and the rotary drum filter. <br /> APPENDIX PAGE 13 <br />