21 st Century Biofilm Reactors TREATING FOR TROUT. Northport/Leelanau Township Wastewater Treatment Facility. Presented by: Rich Grant, PE

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1 21 st Century Biofilm Reactors Presented by: Rich Grant, PE TREATING FOR TROUT Northport/Leelanau Township Wastewater Treatment Facility

2 Concepts A Revitalizing Story: importance of collection The Technology; intro Benefits & Costs Operations Energy Green Robust; glacier country Stewardship

3 Project Issues Small lots with old/failing drainfields (or no system) Locally high groundwater table Poor draining soils Steep slopes Health Dept. not approving on-site wastewater disposal Service District Village of Northport Leelanau Township (portion) REUs- 450 Residential & 215 Institutional & Commercial Project Background

4 Project Background Wastewater Treatment Facility Design 132,000 gpd 20-yr Avg. Day Design Flow Design Influent Wastewater Strength Design: 275 mg/l BOD-5 & TSS 34 mg/l NH-3, 46 mg/l TKN 8 mg/l Total Phosphorus Effluent Limits (Groundwater Discharge Venting to Surface Water) 0.3 mg/l Total Phosphorus 30 mg/l BOD-5 (8 mg/l) Total Nitrogen (treatment goal; not effluent limit)

5 Treatment Processes: Influent Fine Screening Pre-Anoxic Basin/Influent Equalization Moving Bed Biological Reactors (MBBRs) Cavitation Air Flotation (CAF) Effluent Equalization/Settling Basin Tertiary Filtration (Sand Filters in Series) Chemical Storage/Feed (Ferric Chloride) 2 nd Treatment Basin (Future 2 nd MBBR reactor) Storage/Stdby Biosolids Storage Basin Rapid Infiltration Basins for final discharge Project Background

6 Northport WWTP Site Plan MBBR

7 Dual Polishing Filters, In Series Highly polished effluent before discharge at R.I.B.s Entirely Gravity Flow Hydraulic Design

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9 Rapid Infiltration Basins (RIBs) 3 New RIBs at Base of Hillside 2 Ex. Facultative Lagoons Re-Constructed to Serve as RIBs

10 MBBR Process Description MBBR: Moving Bed Biofilm Reactor (see also IFAS ) Technology: Norway for 1992 Lillehammer Winter Olympics Attached growth system; similar to trickling filter, RBCs Biofilm grows inside free-floating plastic media carriers in the tank(s) Biofilm acclimates to operating conditions, with reactors for anoxic & aerobic treatment

11 MBBR with Biofilm Inside Carriers

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13 MBBR is Energy Efficient 50% to 90% smaller footprint required for the same treatment as conventional activated sludge Reduces mixing energy required Aeration design is due to oxygen demand not mixing requirement

14 MBBR is Green Smaller carbon footprint lifecycle Source Mark Steichen, et al Carbon Footprinting of Wastewater Treatment Technologies

15 MBBR Green Business Case Current DEQ standards for green show the Northport WWTP Project meets the definition of a "Categorical GPR Project under 1) "Energy Efficiency" guidelines "use of improved technologies & practices to reduce energy consumption of water quality projects use energy in a more efficient way MBBR blower energy used for dual purposes, mixing and aeration. Smaller reactor = less energy for mixing Mixing energy = aeration energy (not typical of conventional RAS) MBBR biofilm carriers provide increased oxygen mass transfer efficiency, Increased Transfer Efficiency = reduced aeration and energy requirements. 2) "Environmentally Innovative" guidelines, "... demonstrating new and/or innovative approaches to delivering services or managing water resources in a more sustainable way.

16 Cost Comparisons For Various Performance Example 25mgd WWTP Source: When is IFAS the Right Choice? Johnson et al, Black & Veatch WEFTEC 2006

17 MBBR is Innovative MDEQ Northport is first full-scale MBBR in Michigan ACEC/MI Honorable Conceptor Award for Engineering Excellence National ACEC recognition award

18 GPS-x Process Modeling Dynamic process modeling at design phase, demonstration to DEQ

19 Pre-Anoxic Basin Tri-Fecta Maintain Heat Address Oxygen Depletion Failures (others) Advantage of Free Carbon Source

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21 Maintain Heat Traditional Nitrification Cut-off: 50-55F This Project: Consistent Nitrification/De-Nite to 38F

22 Complex GW Flows MODFLO Modeling Required

23 Best available project site located on a hillside Wetlands bordering bottom of hillside & surrounding area Adjacent ex. facultative lagoons property donated to Village to incorporate with new WWTF Loamy or clay soils a challenge for groundwater discharge Installation and prove-out of infiltration/collection trenches Site Challenges

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25 Prior Owner Left Some Impacted Groundwater

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36 Biosolids Reuse Fertilizer Product Accumulation in Solar-Energy-Mixed Pond Land-Applied at Agronomic Rates

37 Treating for Trout important for discharge in Northport Creek Watershed Millpond stocked annually with trout for the Derby Some trout remain and Northport Creek is so-designated Preferred temperatures: 52-62F summer Low nutrients Low BOD High D.O. Trout like the typical Michigan Groundwater temperatures!

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39 30F Nitrification/De-Nite Not required, but highly recommended Highly recommended, given venting location to Northport Creek Highly recommended, for groundwater quality, nitrates control Included in the Design Year Round with Cold Weather Operations Classic Activated Sludge Performance: TYPICALLY LIMITED TO 50F Consistent Performance This MBBR At 38F! 1.4 mg/l Ammonia avg 6.8 mg/l TIN avg

40 Natural Polishing & Cooling important for discharge in Northport Creek Watershed Secondary + Tertiary Treatment RIB Discharge to Groundwater, polishing and cooling in-ground Groundwater Venting to Surface Water

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42 Operations Overview Northport WWTF & Collection System Operations & Maintenance Provided by OMI, Inc. Lead Operator - Mark Huggard District Manager Chris Keister Operation Manager - Scott Blair

43 BOD Concentration in Effluent

44 Phosphorus Concentration in Effluent

45 Nitrogen Concentration in Effluent

46 Phosphorus Concentration in Monitoring Wells

47 Ammonia in Monitoring Wells

48 TIN Concentration in Monitoring Wells

49 Questions?

50 Treating for Trout Cold Weather Treatment - Trout favor Michigan Groundwater temperatures!

51 21 st Century Biofilm Reactors Contact : Rich Grant, PE TREATING FOR TROUT Northport/Leelanau Township Wastewater Treatment Facility

52 MBBR Capital Cost Economies of Scale Small MBBR with Nite/De-Nite Dual- Filtration, Site Issues, POTW MBBR High BOD POTW MBR High BOD Commercial MBBR MBR, 2x the Curve, POTW