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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.

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Presentation on theme: "© 2013 O’Brien & Gere Volute Press Application on Water Treatment Residuals 2013 NYC Watershed / Tifft Science & Technical Symposium September 19, 2013."— Presentation transcript:

1 © 2013 O’Brien & Gere Volute Press Application on Water Treatment Residuals 2013 NYC Watershed / Tifft Science & Technical Symposium September 19, 2013 #obgPresents

2 © 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

3 © 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

4 © 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

5 © 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

6 © 2013 O’Brien & Gere PW Tech Volute Press 6 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

7 © 2013 O’Brien & Gere Typical Installation 7 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

8 © 2013 O’Brien & Gere PWTech Video 8 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

9 © 2013 O’Brien & Gere PWTech Volute Press Pilot 9 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

10 © 2013 O’Brien & Gere BDP Industries Pilot 10 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

11 © 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

12 © 2013 O’Brien & Gere Raw Water Solids Data 12 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

13 © 2013 O’Brien & Gere Proposed Facilities 13 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

14 © 2013 O’Brien & Gere Proposed Building – North Elevation 14 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

15 © 2013 O’Brien & Gere Proposed Building – West Elevation 15 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

16 © 2013 O’Brien & Gere Current Project Status 16 \MD\Pres_Int&Corp\Tech-Conf\2013\NYCWatershedTSTS

17 © 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

18 © 2013 O’Brien & Gere


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