THE MAGAZINE FOR THE DRAINAGE,WATER &WASTEWATER INDUSTRIES


CASE STUDIES


itwas decided to replace theCage RotorAeratorswith largerMagna RotorAerators fromLakeside (with consulting engineers Poggemeyer DesignGroup, designing the treatment plant upgrade). As aerators, these high-performance LakesideMagna Rotors provide oxygen to the biologicalmass - andmixmicroorganisms uniformly to prevent solids fromsettling in the biological treatment system. It also makes it possible to sustain high concentrations ofmicroorganisms so that variations in organic loading and shock loads are comfortably absorbed by the system.Thewide range of oxygen transfer provides WestUnity’s plant operatorswithmaximumflexibility tomatch the demand of the system.Oxygen enrichment efficiency is further enhanced by flowcontrol baffles. Aswell as the newMagna RotorAerators, a principal forgiveness loan fromthe division of environmental and financial assistance fromthe Ohio EPA’s State Revolving Loan Fund, also helped secure a new headworks.This consists of a LakesideMicro Raptor Strainer Screen and a newLakeside Spiragrit grit removal systemin amasonry building.The complete project has also included a newadministration building, replacement of theUV disinfection equipment, flowmeters, Variable FrequencyDrives, SCADA, piping, demolition and electrical work. ‘Wewereconfident thatwewerealso investinginsuperiorqualityengineering’ RandyMahlman,WestUnity’sWaterand WastewaterTreatmentPlant Superintendent,continued:“Wewanted equipment thatwouldstandthetestof time, soinsistedonhighlyefficient stainless-steel rotors foraeration, rather thanhaveaproduct thatwouldinevitably needreplacing. “Lakeside’soxidationditcheshavealong trackrecordhere,goingbackover40years, sowewereconfident thatwewerealso investinginsuperiorqualityengineering withthenewscreenandthegritcollector”. Ideal for smaller treatment facilities suchas WestUnity,Lakeside’sRaptorMicroStrainer screenbenefits fromasemi-circularbasket withapertures rangingfrom0.04to0.25- inches (1to6mm) tocapturesmalldebris thatpasses throughother screens. Capturedscreeningsarewashed, compactedanddewateredtoadrysolids contentof40percentas theyare transportedupaninclinedscrewfor disposal.This stepreducesvolumeby50 percentandweightby67percent, significantlyreducingdisposalcosts. TheLakesideSpiraGritvortexgrit removal systematWestUnityremoves inorganicgrit inamechanicallyinducedvortexenvironment.Rotatingpaddlesmaintain theflowvelocityinthevortexchamber,keepingorganics insuspension whileallowingheaviergrit tosettleonthechamberfloor,beforedropping intothelowergrithopper. ‘Immediateimprovement’ “The plant is nowrunning somuch better”, added RandyMahlman, “and despite the newMagna Rotors being larger,we have seen a decrease in horsepower, sowe aremaking savings on power consumption”.


The Raptor®Micro


Strainer screen (Lakeside) iswell suited for smaller clean-water facilities


SpiraGrit™ Vortex Grit Removal System


(Lakeside) provides effective capture,


washing, and removal of grit


Josh Fritsch concluded:“Lakeside and their agent PaulMatrka at Smith Environmental haveworked very closelywith us, helping optimise the equipmentwith some adjustments.We also thought thatwe’d see plies and piles of rags, but the equipmentwashes themand compresses themefficiently,meaningwe don’t need a big dumpster, whichwe first thoughtwould be essential. Before the improvements wemight seeDOs of 0.2mg/l but nowwe’re up at 1.5mg/l and higher. We sawan immediate improvement in the treatment plant’s performance,which hasmeant thatwe noweasilymeet our effluent permit limits”.


FOLLOW US July 2020 | drain TRADER 23


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