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GenChem International, LLC <br />484 E. Carmel Drive #142 <br />t'1 Carmel, Indiana 46032 <br />12 Cm <br />E PH.: (317) 574-4970 <br />liti Fax: (317) 571-1416 <br />City of South Bend <br />Wastewater Treatment Plant <br />3113 Riverside Drive <br />South Bend, IN 46628 <br />Nancy Clay <br />On 4/8/2025 GCI performed a sludge dewatering polymer trial at the belt press. Two polymers were trialed. <br />Josh Sporleder from the plant was present for the trial. <br />The polymer was made down the same dilution strength as being used historically. This dilution strength is <br />roughly .38%. It may be possible to lower GCI dilution strength to a .2%. <br />The polymer tanks are 1860 gallons each (2 onsite) which are being refilled by an automatic feed system. One <br />mixed tank lasts roughly 2 hours. There are 4 belt presses onsite with the influent set at 80gpm. Each press is <br />outfitted with its own dosing pumps. Drawdowns were performed on each pump. <br />Pump 1/ 15,000 ml/min <br />Pump 2/ 10,500 ml/min <br />Pump 3/ 10,500 ml/min <br />Pump 4/ 9,900 ml/min <br />In conclusion: <br />Josh Sporleder determined the trial a success using GCI DCF-94. It was observed that this polymer worked as <br />well and maybe slightly better than the current polymer on site. <br />Percent solids tests were performed by staff. This test was performed with a microwave. GCI has never seen <br />this method used and we are unknown on the accuracy of the results. <br />Press 1/ 15.4% <br />Press 2/ 14.3% <br />Press 3/ 13.9% <br />Press 4/ 17.2% <br />