Wastewater Administrator’s Conference Frankenmuth, Michigan THE WYOMING CLEAN WATER PLANT BIO-P 21 January 2011 START-UP STORY CRAIG SMITH - WYOMING CLEAN WATER PLANT ED KOBYLINSKI - BLACK & VEATCH
START-UP PLAN • Understand Bio-P and how it works • Understand process configuration – New Process and New Basins 2 January 21, 2011, 2010
SCADA CONTROL SCREEN
START-UP PLAN • Understand Bio-P and how it works • Understand process configuration – New Process and New Basins • Analytical plan for process monitoring • Process Changeover • Build MLSS to seed new basins • Start slow • Move chem P addition to final clarifier • Slowly reduce ferric addition • Monitor for P release in anaerobic zone • Turn off ferric feed 4 January 21, 2011, 2010
HOW DOES BIO-P WORK?
UNDERSTANDING BIO-P - UNDER ANAEROBIC CONDITIONS – PHOSPHORUS RELEASE AND ATP DEPLETION Phosphate O O O Poly-P Poly-P O P O Poly-P O P O O P O Poly-P O O O ATP Magnesium Using Energy H 2 N Adenosine Tri-Phosphate N Bio-battery for energy storage N PHB PHB PHB PHB O O O N N O P O O P O O P O O O O O VFA VFA VFA VFA Volatile OH OH Fatty Acids January 21, 2011, 2010 6
WHAT ARE VFA? • Volatile fatty acids are a group of low molecular weight acids that are easily consumed by microorganisms – Bug Food • Chemically the VFA are comprised of Acetic, Propionic, Butyric, Caproic, Valeric acids and others • What VFA are we most interested in? – Acetic and Propionic acids • Many microbes love acetic acid as food – candy for the bugs • Some acids cannot be eaten by different groups of bugs • Our PAOs thrive on acetic and propionic acids – so presence of propionic acid in the anaerobic zone indicates that enough VFA are present to get the job done. 7 January 21, 2011, 2010
PHB Poly-P Electron microscope – Poly-P stains black, PHB stains white Poly-P 8 November 16-18, 2010
UNDERSTANDING BIO-P UNDER AEROBIC CONDITIONS - PHOSPHATE UPTAKE/ ATP PRODUCTION ATP Bio-battery is Phosphate H 2 N recharging N Poly-P N Poly- O Poly-P O O Poly-P N P N O P O O P O O P O O O O O Making Energy Magnesium OH OH Aeration Basin PHB PHB PHB PHB PHB 9 January 21, 2011, 2010
B&V - 10 May 11-14, 2010 Poly-phosphate stored in the aerobic zone. Phosphorus is removed with the WAS. Poly-P New Process and operators need to know what to watch for! 10 January 21, 2011, 2010
BIO-P PROCESS CONFIGURATION • Plant designed for year round nitrification • At this time activated sludge basins are not configured to denitrify – nitrates will be present in RAS return stream • Anaerobic zone has been inserted ahead of the activated sludge basin - RAS is returned through the anaerobic zone for conditioning – P release • A pre-anoxic zone is located ahead of the anaerobic zone for removal of oxygen and nitrate from RAS – reduce interference in anaerobic zone • Primary effluent can be split between the pre-anoxic zone and anaerobic zone – food source for pre-anoxic zone for removal of DO and nitrate 11 January 21, 2011, 2010
BIO-P PROCESS CONFIGURATION Anaerobic Zone – Rest of PE 10-30% PE provides conditions for phosphorus Anaerobic Zone release Pre- Anoxic Zone 1 2 3 RAS 1 st Oxic Separate oxic zones Phosphorus Uptake under aerobic conditions for DO control 2 nd Oxic Can add ferric for To Final trim control of Clarifiers phosphorus 12 January 21, 2011, 2010
Mixers Anaerobic Cell 3 effluent Oxic Cell 1 13 January 21, 2011, 2010
• Minimal surface agitation to limit aeration of cell Photo Caption Box. To Use, copy and paste box into slide. • Mixing sufficient to keep MLSS in suspension and blend dis-similar streams 14 January 21, 2011, 2010
WHAT DO YOU MONITOR DURING START- UP OF A BIO-P PROCESS?
PROCESS MONITORING FOR BIO-P STATUS 1 Primary Effluent Pre- Anoxic 2 3 Zone Anaerobic Zone • Point 1 – Monitor primary effluent for VFA, TP and Ortho P • Point 2 – Monitor pre-anoxic zone for DO, ORP and nitrate • Point 3 – Monitor anaerobic zone for ORP, Ortho P and VFA • Point 4 – Oxic basin effluent for Ortho P 16 January 21, 2011, 2010
WHAT DOES THE MONITORING SHOW AND WHAT DO WE DO ABOUT IT? • Primary effluent – If low in VFA, run a deeper sludge blanket to give sludge time to ferment more VSS to VFA in the primary clarifier • Nitrate in RAS – If RAS nitrate concentration is high, increase primary effluent flow to the pre-anoxic cells – decrease RAS flow • ORP in anaerobic cells is high – Check DO control in aeration basin and flow split of primary effluent to the pre-anoxic cells – Reduce RAS flow if possible • Ortho-P in plant effluent is rising – check all of the above – check P release in anaerobic cells – Check nitrate and DO in RAS and in pre-anoxic cells – Check DO in aeration basin (Need positive DO in upstream end of basin to ensure good P Uptake) 17 January 21, 2011, 2010
WHAT DOES THE MONITORING SHOW AND WHAT DO WE DO ABOUT IT? • No VFA showing up at end of anaerobic cells • Could mean that DO and nitrate are in the RAS and interfering with P release and fermentation • Could mean that influent carbon (rbCOD) is low and not enough fermentation is occurring in the anaerobic cells • Might be a high flow event – rainstorm or snow melt interfering with fermentation in the collection system • Influent VFA production is seasonal so may be at a low VFA production time • May not have enough rbCOD in WWTP influent – natural causes or caused by addition of chemicals in collection system 18 January 21, 2011, 2010
Concentration (mg/L) Concentration (mg/L) 100 110 120 130 100 110 120 130 Acetic Acid Acetic Acid 10 20 30 40 50 60 70 80 90 10 20 30 40 50 60 70 80 90 0 0 7/12/04 8am C 1/31/2005 Shift 1 Duplicates 7/12/04 3pm C 1/31/2005 Shift 2 7/12/04 3pm DUPL Propionic Acid Propionic Acid 7/12/04 11pm C 1/31/2005 Shift 2 Dupl Duplicates 7/14/04 8am C Wyoming CWP Influent Volatile Fatty Acids - February 1/31/2005 Shift 3 Dupl duplicate not taken 7/14/04 3pm C 1/31/2005 Shift 3 Dupl 7/14/04 10:45pm C 2/2/05 12:00 AM Isobutyric Acid Isobutyric Acid broken in shipping Duplicates 2/2/05 2:00 AM 7/16/04 4am C 7/16/04 11:30am C Duplicates 2/2/05 2:00 AM 7/16/04 11:30am DUPL 2/2/05 4:00 AM 7/21/04 6-8am C 7/21/04 8-10am C Butyric Acid Butyric Acid 2/2/05 6:00 AM 7/21/04 10am-12pm C Duplicates Individual Samples Individual Samples 2/2/05 8:00 AM 7/21/04 12-2pm C 7/21/04 12-2pm DUPL 2/2/05 10:00 AM 7/21/04 2-4pm C 2/2/05 12:00 PM 2-Methylbutyric Acid 2-Methylbutyric Acid 7/21/04 4-6pm C Duplicates 7/21/04 6-8pm C 2/2/05 2:00 PM 7/21/04 8-10pm C 2/2/05 2:00 PM 7/21/04 10pm-12am C Duplicates 7/22/04 12-2am C 2/2/05 4:00 PM 7/22/04 12-2am DUPL Duplicates 2/2/05 6:00 PM 7/22/04 2-4am C Duplicates Isovaleric Acid 7/22/04 4-6am C Isovaleric Acid 2/2/05 6:00 PM 7/22/04 4-6am DUPL 2/2/05 8:00 PM 7/22/04 12-8am C 7/22/04 3pm C 2/2/05 10:00 PM Duplicates 7/22/04 10pm C 2/03/05 Shift 1 7/22/04 10pm DUPL Valeric Acid Valeric Acid Duplicates 2/03/05 Shift 1 Dupl 7/24/04 7:30am C Duplicates 7/24/04 7:30 am DUPL 2/03/05 Shift 2 7/24/04 4pm C 2/03/05 Shift 2 Dupl 7/24/04 11:30pm C
SYSTEM START-UP – THE NEW PROCESS AND PERFORMANCE DATA
ORIGINAL FACILITY – TWO STAGE TRICKLING FILTER / ACTIVATED SLUDGE PROCESS 21 January 21, 2011, 2010
NEW PLANT – SINGLE STAGE ACTIVATED SLUDGE PROCESS WITH BIO-P New Clarifiers New activated sludge basins TFs removed from site 22 January 21, 2011, 2010
START-UP OF NITRIFICATION • Transferred MLSS to Basin 4 and got good nitrification but not complete nitrification • Brought second basin into service and nitrification improved to less than 0.5 mg/L in a few days 23 January 21, 2011, 2010
START-UP HISTORY FOR NUMBER OF BASINS IN SERVICE Blower Failures • Once two basins were in service – no problems with nitrification • Upsets due to blower malfunctions 24 January 21, 2011, 2010
NH 3 AND PO 4 -N LEVELS AS BASINS CAME ONLINE Effluent TP • Nitrification start-up independent of Bio-P – different sets of Microbes 25 January 21, 2011, 2010
NH 3 AND PO 4 -N LEVELS AS FERRIC ADDITION WAS REDUCED Iron added for Iron added Bio-P is Odor Control only for odor working control Permit Limit Permit limit = 1.0 mg/L as P = 1 mg/L P • Slowly reduced chemical addition to rely on Bio-P -Final conversion in Jan 2009 • Heavy rain/ high influent flows affect Bio-P – High sewer liquid velocities strip off slime that ferments VSS to VFA in sewer 26 January 21, 2011, 2010
COMPLETE NITRIFICATION CREATES A NITRATE RECYCLE CONDITION TO MONITOR Denitrification occurs in sludge blanket in final clarifiers 27 January 21, 2011, 2010
MONITORING ORTHO-P CONCENTRATION THROUGH ANAEROBIC CELLS Daily Ortho-P concentrations, mg/L as P 5/1/2008 5/2/2008 5/3/2008 5/4/2008 5/5/2008 5/6/2008 Zone 3 3.9 3.1 4.6 2.9 3.2 4.4 Zone 4 3.9 3.4 4.9 3.4 3.8 4.5 Zone 5 4.1 3.5 4.8 3.6 3.9 4.5 Cell 2 0.8 0.8 0.8 0.7 1.3 1.7 • Daily Ortho-P concentrations show a rise across the anaerobic zones • Increasing Ortho-P concentration means PAOs are releasing phosphorus • Because there is little P in recycle streams (Liquid land application) there appears to be not a lot of release 28 January 21, 2011, 2010
Recommend
More recommend
