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

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Dialing in a Membrane Bioreactor for Nutrient Removal

Butte-Silver Bow, Montana

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2016 MSAWWA-MWEA Joint Conference - presentation title goes here. 2

EQ Basin Headworks Fine Screen/Turbo Compressor Building Bioreactor Membrane/ Chemical Building

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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

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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

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

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

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

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

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

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Bioreactor Processes

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

SUMMER ONLY

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Bioreactor Processes

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

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Bioreactor Processes

Anaerobic –
Phosphorus accumulating organisms (PAOs) release phosphorous and

consume/store readily available carbon source (volatile fatty acids, VFAs

r “PAO candy”)
Aerobic –
Heterotrophs consume carbon (BOD) and use DO for respiration
Autotrophs convert ammonia to nitrate (NO3), use dissolved CO2 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 NO3

for facultative respiration and consume carbon (BOD)

Autotrophs and PAOs hang out without doing too much

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Bioreactor Processes

Anoxic Aerobic Anoxic Incomplete Denitrification Membranes MLR – nitrate Return Activated Sludge (RAS)

Non-Summer Operation (~8 mo/yr)

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Bioreactor Processes

Anaerobic Aerobic Anoxic Full Denitrification Membranes MLR – low to no nitrate Return Activated Sludge (RAS)

Summer Operation (~4 mo/yr)

Alum MicroC

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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
ther wastewater constituents to form solid

precipitates

5/11/2020 Morrison-Maierle Webinar 15

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Bioreactor Processes

Anaerobic Aerobic Anoxic Full Denitrification Membranes MLR – low to no nitrate Return Activated Sludge (RAS)

Summer Operation (~4 mo/yr)

Alum MicroC

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Membrane System

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Membrane System

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Membrane System

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Treatment Performance

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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

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Effluent Nutrient Data Overview

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 1 2 3 4 5 6 6/1/2017 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 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 Phosphorous Concentration, mg/L Nitrogen Concentration, mg/L Total Nitrogen, mg/L Total Phosphorous, mg/L

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Effluent Nutrients vs. Temperature

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

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Effluent Nitrogen

vs. Chemical Addition
0-No chemical addition
1-Alum low dose
2-Alum medium dose
3-Alum high dose
4-MicroC low dose
5-MicroC medium dose
6-MicroC high dose
7-Alum low + MicroC low
8-Alum high + MicroC high

1 2 3 4 5 6 1 2 3 4 5 6 7 8 TN Concentration, mg/L Chemical Addition Scenario

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Nitrogen 2018

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Flow, mgd; Concentration, mg/L Effluent Flow, mgd Effluent TN, mg/L Train 4 Nitrate Probe

Micro-C medium Alum low Alum high Alum low gpd Micro-C low

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Nitrogen 2019

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 Flow, mgd; Concetration,mg/L ELI Eff TN, mg/L Train 4 Nitrate Probe Effluent Flow, mgd

Micro-C low Micro-C low Alum high Alum medium

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Effluent Phosphorous

vs. Chemical Addition
0-No chemical addition
1-Alum low dose
2-Alum medium dose
3-Alum high dose
4-MicroC low dose
5-MicroC medium dose
6-MicroC high dose
7-Alum low + MicroC low
8-Alum high + MicroC high

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 1 2 3 4 5 6 7 8 TP Concentration, mg/L Chemical Addition Scenario

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Phosphorous 2018

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Concentration, mg/L Flow, mgd Effluent Flow, mgd Effluent TP, mg/L

Micro-C medium Alum low Alum high Alum low Micro-C low

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Phosphorous 2019

0.00 1.00 2.00 3.00 4.00 5.00 6.00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Flow, mgd Concetration, mg/L Effluent TP, mg/L Effluent Flow, mgd

Micro-C low Micro-C high Alum high Alum medium

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Recap

Alum does reduce effluent TP
May remove too much phosphate from the process
Phosphate becomes limiting nutrient, hampering growth
f 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

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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?

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Restoring Silver Bow Creek

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Total Nitrogen

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

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Total Phosphorous

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

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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