Dialing in a Membrane Bioreactor for Nutrient Removal Butte-Silver - PowerPoint PPT Presentation

Dialing in a Membrane Bioreactor for Nutrient Removal Butte-Silver Bow, Montana

Fine Screen/Turbo Compressor Building Bioreactor Membrane/ Chemical Building Headworks EQ Basin 2016 MSAWWA-MWEA Joint Conference - 2 presentation title goes here.

The Numbers • 2016 – new process taken into service • 2017, 2018, 2019 – period of record for presented nutrient data • 2007-2019 – period of record for presented metals data • 3.9 mgd – overall current average plant flow • 5.5 mgd – overall full build-out design average flow 5/11/2020 Morrison-Maierle Webinar 3

The Numbers • 3.7 mg/L – average influent total phosphorous • 28 mg/L – average influent total nitrogen • 99 µg/L – average influent copper (TR) • 295 µg/L – average influent zinc (TR) 5/11/2020 Morrison-Maierle Webinar 4

2016 MSAWWA-MWEA Joint Conference - 5 presentation title goes here.

2016 MSAWWA-MWEA Joint Conference - 6 presentation title goes here.

2016 MSAWWA-MWEA Joint Conference - 7 presentation title goes here.

2016 MSAWWA-MWEA Joint Conference - 8 presentation title goes here.

2016 MSAWWA-MWEA Joint Conference - 9 presentation title goes here.

Bioreactor Processes SUMMER ONLY MicroC2000 Alum Addition Addition MLR - 2Q F G D E A B C RAS - 5Q

Bioreactor Processes Return Activated Sludge (RAS) Membranes Anoxic Anaerobic/ Aerobic Anoxic Mixed Liquor Recycle

Bioreactor Processes • Anaerobic – • Phosphorus accumulating organisms (PAOs) release phosphorous and consume/store readily available carbon source (volatile fatty acids, VFAs or “PAO candy”) • Aerobic – • Heterotrophs consume carbon (BOD) and use DO for respiration • Autotrophs convert ammonia to nitrate (NO 3 ), use dissolved CO 2 as food source, and DO for respiration • PAOs take up phosphorous while living off the stored “candy” • Anoxic – • Heterotrophs are deprived of DO and turn to using the oxygen in NO 3 for facultative respiration and consume carbon (BOD) • Autotrophs and PAOs hang out without doing too much 5/11/2020 Morrison-Maierle Webinar 12

Bioreactor Processes Non-Summer Operation (~8 mo/yr) Return Activated Sludge (RAS) Anoxic Membranes Anoxic Aerobic Incomplete Denitrification MLR – nitrate

Bioreactor Processes Summer Operation (~4 mo/yr) Return Activated Sludge (RAS) Alum MicroC Anoxic Membranes Anaerobic Aerobic Full Denitrification MLR – low to no nitrate

Chemical Info • MicroC (Vita-Micro CS 70) • Proprietary glycerin-based carbon source for microorganisms, used here particularly for heterotrophs during denitrification and possibly during phosphorous release • Alum (aluminum sulfate) • Metal salt that reacts with ortho-phosphate and other wastewater constituents to form solid precipitates 5/11/2020 Morrison-Maierle Webinar 15

Bioreactor Processes Summer Operation (~4 mo/yr) Return Activated Sludge (RAS) Alum MicroC Anoxic Membranes Anaerobic Aerobic Full Denitrification MLR – low to no nitrate

Membrane System

Membrane System

Membrane System

Treatment Performance

The Numbers • 2016 – new process taken into service • 2017, 2018, 2019 – period of record for presented nutrient data • 3.7 mg/L – average influent total phosphorous • 28 mg/L – average influent total nitrogen 5/11/2020 Morrison-Maierle Webinar 21

Nitrogen Concentration, mg/L 0 1 2 3 4 5 6 6/1/2017 Effluent Nutrient Data Overview 7/1/2017 8/1/2017 9/1/2017 10/1/2017 11/1/2017 12/1/2017 1/1/2018 2/1/2018 3/1/2018 4/1/2018 5/1/2018 6/1/2018 7/1/2018 8/1/2018 9/1/2018 10/1/2018 Total Phosphorous, mg/L Total Nitrogen, mg/L 11/1/2018 12/1/2018 1/1/2019 2/1/2019 3/1/2019 4/1/2019 5/1/2019 6/1/2019 7/1/2019 8/1/2019 9/1/2019 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Phosphorous Concentration, mg/L

Effluent Nutrients vs. Temperature 6 1.8 1.6 5 1.4 TN Concentration, mg/L 4 1.2 TP Concentration, mg/L 1 3 0.8 2 0.6 0.4 1 0.2 0 0 10 12 14 16 18 20 10 12 14 16 18 20 Temperature, °C Temperature, °C

Effluent Nitrogen vs. Chemical Addition • 0-No chemical addition 6 • 1-Alum low dose 5 • 2-Alum medium dose TN Concentration, mg/L 4 • 3-Alum high dose • 4-MicroC low dose 3 • 5-MicroC medium dose 2 • 6-MicroC high dose 1 • 7-Alum low + MicroC low 0 • 8-Alum high + MicroC high 0 1 2 3 4 5 6 7 8 Chemical Addition Scenario

Nitrogen 2018 6.0 5.5 Alum Alum Alum 5.0 low high low gpd Micro-C Micro-C 4.5 medium low 4.0 Flow, mgd; Concentration, mg/L 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Effluent Flow, mgd Effluent TN, mg/L Train 4 Nitrate Probe

Nitrogen 2019 6.00 5.50 Alum Alum 5.00 high medium Micro-C Micro-C 4.50 low low 4.00 3.50 Flow, mgd; Concetration,mg/L 3.00 2.50 2.00 1.50 1.00 0.50 0.00 ELI Eff TN, mg/L Train 4 Nitrate Probe Effluent Flow, mgd

Effluent Phosphorous vs. Chemical Addition • 0-No chemical addition 1.8 1.6 • 1-Alum low dose 1.4 • 2-Alum medium dose TP Concentration, mg/L 1.2 • 3-Alum high dose 1 • 4-MicroC low dose 0.8 0.6 • 5-MicroC medium dose 0.4 • 6-MicroC high dose 0.2 • 7-Alum low + MicroC low 0 0 1 2 3 4 5 6 7 8 • 8-Alum high + MicroC high Chemical Addition Scenario

Phosphorous 2018 6.0 0.60 Alum Alum Alum low high low 5.0 0.50 Micro-C Micro-C medium low 4.0 0.40 Concentration, mg/L 3.0 0.30 Flow, mgd 2.0 0.20 1.0 0.10 0.0 0.00 Effluent Flow, mgd Effluent TP, mg/L

Phosphorous 2019 1.8 6.00 1.7 1.6 1.5 5.00 1.4 1.3 1.2 4.00 1.1 Concetration, mg/L Flow, mgd 1 0.9 3.00 0.8 0.7 Alum Alum 0.6 2.00 high medium 0.5 Micro-C Micro-C 0.4 low high 0.3 1.00 0.2 0.1 0 0.00 Effluent TP, mg/L Effluent Flow, mgd

Recap • Alum does reduce effluent TP • May remove too much phosphate from the process • Phosphate becomes limiting nutrient, hampering growth of denitrifying bacteria • Stops/reduces bio-P removal • MicroC does reduce effluent TN • MicroC also reduces effluent TP • Acts as “PAO candy” and stimulates biological phosphorous removal • Combining them does not produce additional removal 5/11/2020 Morrison-Maierle Webinar 30

Conclusions • MicroC alone is effective in reducing effluent nutrient concentrations when compared to no chemical addition • TP w/o chemical addition: < 0.4 mg/L • TP w/ chemical addition: < 0.1 mg/L • TN w/o chemical addition: < 3.0 mg/L • TN w/ chemical addition: < 1.5 mg/L • Is this additional reduction in effluent nutrients worth the cost and environmental impact of manufacture and transport of the chemicals? 5/11/2020 Morrison-Maierle Webinar 31

Restoring Silver Bow Creek

Total Nitrogen 40 35 30 25 Concentration, mg/L 20 15 10 5 0 1 2 3 4 5 6 7 8 9 10 11 12 2001 2002 2003 2004 2005 2008 2009 2010 2014 2015 2016 2017 2018 2019

Total Phosphorous 5.0 4.5 4.0 3.5 3.0 Concentration, mg/L 2.5 2.0 1.5 1.0 0.5 0.0 1 2 3 4 5 6 7 8 9 10 11 12 2001 2002 2003 2004 2005 2008 2009 2010 2014 2015 2016 2017 2018 2019

Nutrient Load to Silver Bow Creek Total Nitrogen Total Phosphorous Average for 2015 21.7 mg/L / 665 lb/d 1.83 mg/L / 56 lb/d Average for 2016 2.75 mg/L / 85 lb/d 1.98 mg/L / 61 lb/d Average for 2017 2.86 mg/L / 98 lb/d 0.31 mg/L / 10 lb/d Average for 2018 2.09 mg/L / 74 lb/d 0.05 mg/L / 1.8 lb/d Average for 2019 1.79 mg/L / 60 lb/d 0.22 mg/L / 7.4 lb/d Averages for June through September for each year.

Nutrient Load to Silver Bow Creek Total Nitrogen Total Phosphorous Average for 2015 21.7 mg/L / 665 lb/d 1.83 mg/L / 56 lb/d Average for 2016 2.75 mg/L / 85 lb/d 1.98 mg/L / 61 lb/d Average for 2017 2.86 mg/L / 98 lb/d 0.31 mg/L / 10 lb/d Average for 2018 2.09 mg/L / 74 lb/d 0.05 mg/L / 1.8 lb/d Average for 2019 1.79 mg/L / 60 lb/d 0.22 mg/L / 7.4 lb/d Averages for June through September for each year.

Nutrient Load to Silver Bow Creek Total Nitrogen Total Phosphorous Average for 2015 21.7 mg/L / 665 lb/d 1.83 mg/L / 56 lb/d Average for 2016 2.75 mg/L / 85 lb/d 1.98 mg/L / 61 lb/d Average for 2017 2.86 mg/L / 98 lb/d 0.31 mg/L / 10 lb/d Average for 2018 2.09 mg/L / 74 lb/d 0.05 mg/L / 1.8 lb/d Average for 2019 1.79 mg/L / 60 lb/d 0.22 mg/L / 7.4 lb/d Averages for June through September for each year.

Nutrient Load to Silver Bow Creek Total Nitrogen Total Phosphorous Average for 2015 21.7 mg/L / 665 lb/d 1.83 mg/L / 56 lb/d Average for 2016 2.75 mg/L / 85 lb/d 1.98 mg/L / 61 lb/d Average for 2017 2.86 mg/L / 98 lb/d 0.31 mg/L / 10 lb/d Average for 2018 2.09 mg/L / 74 lb/d 0.05 mg/L / 1.8 lb/d Average for 2019 1.79 mg/L / 60 lb/d 0.22 mg/L / 7.4 lb/d Averages for June through September for each year.

Nutrient Load to Silver Bow Creek Total Nitrogen Total Phosphorous Average for 2015 21.7 mg/L / 665 lb/d 1.83 mg/L / 56 lb/d Average for 2016 2.75 mg/L / 85 lb/d 1.98 mg/L / 61 lb/d Average for 2017 2.86 mg/L / 98 lb/d 0.31 mg/L / 10 lb/d Average for 2018 2.09 mg/L / 74 lb/d 0.05 mg/L / 1.8 lb/d Average for 2019 1.79 mg/L / 60 lb/d 0.22 mg/L / 7.4 lb/d Averages for June through September for each year.