DESIGNING LAGOON-BASED WWTP FOR <1 MG/ L AMMONIA (AND TN) IN <34 F WATER. Nick Janous Regional Manager
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- Sabina Collins
- 5 years ago
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1 DESIGNING LAGOON-BASED WWTP FOR <1 MG/ L AMMONIA (AND TN) IN <34 F WATER Nick Janous Regional Manager
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3 Aerated Lagoon Subdivide existing facultative pond into three cells using floating baffle curtains.
4 finebubble aeration Excellent oxygen transfer rate at a wide range of airflows Specifically designed for cold climate lagoon applications
5 Getting lagoon-based WWTPs Ammonia down to <1 mg/ L in <1 C water
6 What is a? Fully-aerated coarse gravel bed reactor Dense rock not susceptible to temperature shock Provides surface area attached-growth nitrifying biomass needs. Aeration throughout SAGR floor creates aerobic conditions.
7 Why does the work? 1. Fully aerated 2. Post-lagoon/sized for BOD polishing 3. Ample surface area in non-turbulent environment 4. Patented Step-Feed prebuilds/stores nitrifiers with built-in temperature buffering
8 Construction
9 Without Step-Feed: Without Step-Feed: Summer Without Step-Feed: Winter
10 Step-Feed: Autumn Summer Winter
11 O&M Operations & Maintenance similar to aerated lagoon No solids return to monitor/adjust Only moving parts are blowers Takes operators avg. 5 mins/day
12 Choose with confidence 70+ installations across North America 12,000+ data points 4 demonstration scale plants in Canada 19 year-old facilities Nexom contacts all SAGR installations at least once every year
13 Third-Party Winter Operation Verification Data January 13 April 21, 2010 Influent Avg (mg/l) Effluent Avg (mg/l) Removal cbod % TSS % TAN % TKN % FC (cfu/100ml) 253, % Avg water temp ( C)
14 Use caution before accepting pilot data at face value Can miss coldest winter Variability of water flows and chemistry Lagoon Nitrification varies seasonally More media doesn t mean more removal
15 Why a demonstration site in Steinbach MB? <1 C water for 5 months full year 3 full years, actually full scale with actual layout parallel trains: test & control
16 projects
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18 Long Pla in First Nation Operator continuity
19 Long Plain First Nation, MB Non-compliant Sequencing Batch Reactor Limited access to trained operators Growing population
20 Long Plain First Nation, MB 2-Cell Aerated Lagoons Alum Addition Influent Sand Filter UV Disinfection Effluent
21 Long Plain First Nation, MB TAN (m g/ L) Jun 2012 Dec 2012 Jun 2013 Dec 2013 Jun 2014 Dec 2014 Jun 2015 Dec 2015 Influent Effluent Objective
22 Misipawistik Cree Nation Remote & Extremely Cold, with ph Fluctuations
23 Misipawistik Cree Nation, MB Influent Alum Addition Aerated Lagoon Facultative Lagoon Effluent Discharge
24 Misipawistik Cree Nation
25 Misipawistik Cree Nation TAN (m g/ L) May 2014 Jul 2014 Sep 2014 Nov 2014 Jan 2015 Mar 2015 May 2015 Jul 2015 Water Temp ( C) Limit Influent Effluent
26 100,000 Misipawistik Fecal Coliform (MPN/ 100mL) 10,000 1, May 2014 Jul 2014 Sep 2014 Nov 2014 Jan 2015 Mar 2015 Influent Effluent Limit
27 Newhall, IA Denitrifying Nitrates/ Total Nitrogen with Effluent Recycle
28 De-nitrification Phosphorus limits algae in freshwater. Nitrogen is the limiting factor in marine waters. Often as nitrates.
29 Dead zones 2015 Gulf of Mexico dead zone: 6,747 square miles Second largest in the world
30 Newhall, Iowa Project Type: Municipal Wastewater Design Flow: MGD Effluent Objectives: August TAN: 1.4 mg/l February TAN: 8.1 mg/l BOD: <20 mg/l TSS: <20 mg/l
31 Newhall, Iowa Effluent Discharge TN Recycle Aerated Lagoon Aerated Lagoon Settling Lagoon Influent
32 Newhall, Iowa TAN (m g/ L) Nov 2015 Dec 2015 Jan 2016 Feb 2016 Mar 2016 Apr 2016 Effluent Limit
33 Sundridge, Ontario Project Type: Municipal Wastewater Design Flow: MGD
34 Sundridge, Ontario Alum Addition Aerated Lagoon Influent Alum/ Soda Ash Addition Recycle for partial TN removal & alkalinity recovery Anoxic Lagoon Effluent Discharge
35 Sundridge Treatment December 2015 January 2017 Parameters (mg/l) Influent Effluent Removal Nitrates & Nitrites 3.94 TKN % TN 4.80 TAN % cbod % TSS % E.Coli (CFU/100mL) 16.7 Water temp ( C) 1-24
36 hydraulic conductivity testing Location Technology Biomass Index United Kingdom United States Sub-surface flow wetland (tertiary) Sub-surface flow wetland (secondary) Canada (tertiary)
37 hydraulic conductivity testing How much available pore space is effectively filled with biological growth? Steinbach SAGR Zone System may lack the biomass or nutrients for optimal treatment. Typical System value supports Excess of clean of sufficient biological gravel. biomass growth, to at risk achieve treatment of poor hydraulic without function. compromising hydraulic performance.
38 hydraulic conductivity testing
39 hydraulic conductivity testing cbod 5 Removal Area Nitrification Area During Installation
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