The new PEWE wastewater pretreatment system achieved the desired results: Columbus Salame Case Study
Columbus Salame, South San Francisco CA was established in 1934 to manufacture select quality deli meat to serve area clientele. Production processing increased dramatically as the company flourished. In 1987 the first wastewater pretreatment plant was installed to meet city discharge requirements. Treatment was variable with modest results. The company continued to grow and in 2008 found it necessary to replace the aging, overrun inefficient system. Sewer surcharges were in excess of $500k.
The old system had several shortcomings which needed to be addressed to achieve better treatment. The side-hill screen system was non-functional and a maintenance headache. There was no EQ balancing, no aeration existed, chemical dosing was done with undiluted polymer and the carbon steel DAF vessel was badly corroded. Space for the new treatment system was limited to 10’x20’ area. It was determined that with careful use of valuable space, a complete “green” wastewater treatment plant upgrade was possible. The new system entailed a PEWE externally fed rotary PEWE SuperSkreen, EQ balance tank, flow proportional feed, a PEWE PolyAccu Dose chemical make-down unit, a stainless steel PEWE HD2 XLRator DAF unit complete with modern Rogue MAX RGT regenerative turbine aeration. As a bonus the operators gained complete and total control over the new efficient system with PEWE Command Control PLC alarms, backups and bypasses.
Upon start-up the new wastewater pretreatment system immediately achieved the desired results. Reductions exceeded 75% for TSS, BOD 65% and FOG by some 95%+. The new screening automatically captured large insoluble solids, wood and plastic protecting downstream equipment. The flow proportional chemical system efficiently dosed the proper amount. The stainless steel PEWE HD2XLRator DAF was dream to keep clean. Columbus Salame is very satisfied with their new wastewater treatment system. Sustainable discharge surcharges to the city have been reduced over $250,000+ annually.