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© 2013 O’Brien & Gere Volute Press Application on Water Treatment Residuals 2013 NYC Watershed / Tifft Science & Technical Symposium September 19, 2013 #obgPresents
© 2013 O’Brien & Gere City of Ithaca Located on south end of Cayuga Lake in Finger Lakes Region Population: 30,000 Average water demand: 3 MGD Greater Ithaca area is served by three public water systems Existing 6 MGD conventional water treatment plant was constructed in 1903 Last major upgrade was completed in 1951 City decided to replace its plant rather than buy water from another system 2 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS Ithaca
© 2013 O’Brien & Gere Water Supply Project Elements Dredging water supply reservoir New gatehouse and intake Dam safety improvements Raw water transmission maintenance Re-construction of 6 MGD filtration plant with conventional pre-treatment and membranes Interconnections with other utilities Residual dewatering facility Distribution system improvements 3 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Existing Lagoon Dewatering Operations 4 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS Cleaning typically required 6 people and at least a week per lagoon Some years, both lagoons are cleaned Cleaning often occurs when resources are most valuable Significant liner protection and maintenance required Sludge is blended with compost and earth spoils to create manufactured topsoil
© 2013 O’Brien & Gere Evaluation of Dewatering Options 5 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS StrengthsWeaknesses Lagoon/ Drying Beds Performance is somewhat independent of solids loading Proven technology Flexible to operate in both thickening and dewatering modes Comparatively high visual and noise impacts Intense / short duration labor needs Not expandable if solids loads increase Challenging site constraints Volute Dewatering Press Small footprint Good performance during pilot testing Relatively easy start-up and shutdown procedure Totally enclosed process High wash water requirements for system cleaning Fewer reference installations for similar applications
© 2013 O’Brien & Gere PW Tech Volute Press 6 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Typical Installation 7 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere PWTech Video 8 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere PWTech Volute Press Pilot 9 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere BDP Industries Pilot 10 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Piloting Results 11 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS DescriptionPWTechBDP Industries Test DatesOct. 2011Nov Hydraulic Loading (GPM)3.3 – 810 – 12 Feed Solids (% wt.)0.4 – – 2.0 Cake Dryness (% wt.)21.5 – 4520 – 23 Polymer Dosage (lb. / dry ton)15 – 3228 – 33 Solids Capture Rate (%)98.7 – – 98 Test Unit ModelES DSP Test Unit Capacity (lb./hr.)38380 *All tests performed using PACL sludge
© 2013 O’Brien & Gere Raw Water Solids Data 12 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Proposed Facilities 13 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Proposed Building – North Elevation 14 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Proposed Building – West Elevation 15 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Current Project Status 16 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere Lessons learned Coordinate pilot unit capacity with available sludge capacity Consider the environmental conditions – polymer preparation is temperature dependent Pilot all units under consideration at same time; Side-by-side pilot is much easier to evaluate Pilot optional press features as needed to achieve performance Water plant sludge is not the same as wastewater plant sludge 17 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS
© 2013 O’Brien & Gere
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