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ARAMARK Uniform & Career Apparel , LLC Wastewater Pretreatment System Operating Instructions Stockton , CA The wastewater pre -treatment system receives wastewater primarily from industrial washers , softener regeneration and small amounts of wastewater derived from floor drains and utility sinks . Wastewater from washers , floor drains and utility sinks drain by gravity to an existing black water holding basin . Rinse water or grey water from the laundering process is discharged to another holding basin for reuse back in the laundering process . Wastewater from the black water basin is pumped through a vibratory screen to remove coarse solids . The wastewater is then directed through a heat reclaimer to capture remaining heat from the wastewater. After heat reclamation , the wastewater is discharged into a 106 , 000 equalization tank . The equalization tank is equipped with a mechanical mixer and process wastewater pumps for delivering wastewater to the chemical mixing chamber and dissolved air flotation clarifier . After equalization , wastewater is pumped through a 185 gallon chemical mixing chamber or "tube bundle " where organic polymers and inorganic coagulant aids are introduced to demulsify pollutants from the wastewater and facilitate particle separation . A cationic coagulant , bentonite clay and cationic flocculent provide the make - up the wastewater chemistry . These products are introduced into the tube bundle which provides high energy mixing that allows particle flocculation to occur . A 6 , 595 gallon dissolved air flotation clarifier equipped with inclined plates provides physical separation of suspended solids from the wastewater stream . The unit combines the technology of dissolved air flotation and gravity clarification . Dissolved air , injected into the waste stream , adheres to flocculated particles and floats these solids to the surface of the unit , which are removed by a mechanical skimmer into a solids holding tank . Higher density solids contact the inclined plates of the unit and settle . These solids are removed by an air diaphragm pump and sent to the solids holding tank . Solids contained in the holding tank are transferred by air diaphragm pump to a sludge conditioning tank . The dissolved air flotation clarifier will reduce concentrations of conventional constituents , oil and grease , suspended solids and trace metals .