Read Small System ? <10,000 ? <3,300 text version

Biosolids Handling Improvements at the METRO Syracuse WWTP

Nicholas G. Hatala, P.E. EEA-Stearns &amp; Wheler Gerald C. Hook, P.E. EEA-Stearns &amp; Wheler Randy R. Ott, P.E. Onondaga County DWEP

Project History

· Stage III Ammonia and Stage II Phosphorus Removal Upgrade (2001-2004) · CSO Abatement Projects (various) · Biosolids Handling Capacity Evaluation (2002)

Biosolids Handling

· Gravity thickening (primary + WAS + HRFS) · Anaerobic digestion · Belt filter press dewatering · N-Viro alkaline stabilization

Preliminary Design Evaluation

· Preliminary Design - Biosolids Handling Improvements (2003)

· WAS Thickening Alternatives

· Rotary Drum Thickener · Gravity Belt Thickener · Thickening Centrifuge

· Biosolids Dewatering Alternatives

· Belt filter press · High-solids centrifuge · Rotary press

Performance Requirements

· Dewatering capacity = 3000 lb DS/hr

· Cake solids concentration = 27.5% DS

· Solids capture efficiency = 95%

· Polymer dosage = 17 lb (active)/ton DS

Participating Manufacturers

· Trial 1 (May 17-21, 2004)

· Westfalia Model CA-505 · Flottweg Model Z53

· Trial 2 (June 14-18,2004)

· Alfa Laval ALDEC Model 506 (DS-401) · Andritz Model D4L

Demonstration Testing

Preliminary Arrangements

· Power supply · Piping connections

· Biosolids feed · Water supply · Centrate disposal

· Polymer supply · Cake solids collection/disposal

Testing Protocol

· Day 1 (Monday)

· Delivery and setup of equipment · Initial operation/optimization by mfgrs

· Days 2-4 (Tuesday ­ Thursday)

· Qualifying trials (continuous 6-hour)

· Day 5 (Friday)

· Retesting (if necessary)/Experimentation · Disassembly/removal of equipment · Site cleanup

Sampling and Monitoring Data

· Total solids - manual composite of grab samples collected at 1 hour intervals for biosolids feed, cake solids, and centrate · Biosolids feed flow rate · Polymer solution feed rate · Bowl speed · Differential speed

Demonstration Testing Results

Westfalia Throughput, lb DS/hr Cake solids, % DS Solids Capture, % Polymer, lb/ton DS

*Suspect data

Flottweg 3200 - 3800

Andritz 3300 - 4000

Alfa Laval 3000 - 3700

3200 - 4100

34.2 ­ 34.9

31.0 ­ 35.4

35.6 ­ 36.9

32.6 ­ 34.0

99.1 ­ 99.8

99.0 ­ 99.2

99.3 ­ 99.6

98.8 ­ 99.4

12 - 14

16 - 18

6.6 ­ 9.5*

13 - 17

Biosolids Handling

WAS Thickening

· Three new gravity belt thickeners · Continuous (24 hour/day, 7 day/week) operation · 600 gpm capacity per thickener

Thickened Biosolids Blending

· Two new tanks with mechanical mixers for blending thickened biosolids · Four new hose pumps for digester feed

Centrifuge Dewatering

· 3 units (2 service, 1 standby) · Continuous operation (24/7) · Capacity = 3,000 lb DS/hr/unit · Total capacity = 3 dry tons/hr · Min. cake solids = 30% · Solids capture &gt;95% · Max. polymer dosage = 17 lb/ton DS

Dewatering Performance

· Centrifuge solids throughput = 2,380 lb dry solids/hour · Feed solids concentration = 2.44% · Cake solids concentration = 30.8% · Polymer dosage = 10.3 lb/ton dry solids

Dewatering Performance

Process Drain Pump Clogging

Project Cost/Benefits

· Construction Cost = $12,755,418 · Benefits

· Improve opportunities for continued beneficial reuse of biosolids independent of 3rd party system · Increase biosolids dewatering capacity · Replace equipment approaching the end of its useful life · Recover energy from digester gas

Acknowledgements

· OCDWEP

· · · · · · · · · · Rolf Brown ­ METRO Head Operator Bill Harris ­ Biosolids Head Operator John Saraceni ­ Operations Lead Jim Renk ­ Maintenance Lead Tom Campbell ­ I/E Lead Ron Pernisi ­ Construction Manager Frank Erwin (S&amp;W) ­ Mechanical Design Lead Dan Haberek (S&amp;W) ­ Structural Design James Crosier/Scott Thompson (OBG) ­ E/I Design Fran Ezzo (OBG) ­ Construction Inspection

· EEA

Information

Small System ? <10,000 ? <3,300

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