MWRD PWO Seminar - Berlin.pptx/ 1

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2 Reinventing Wastewater From Wastestream to Resource MWRD PWO Seminar May 23, 2012 Jeff Berlin, P.E.

3 This seminar is focused on advances in energy and resource recovery in wastewater 7:30am-8:00am Speaker INTRODUCTIONS Topic 8:00am-8:45am Jeff Berlin, Carollo Reinventing Wastewater: From Wastestream to Resource 8:45am-9:30am 9:30am-9:45am Bill Hoyt, Colorado Springs Utilities BREAK Ammonia Based Aeration Control - Case Study 1 9:45am-10:30am Craig Barnes, MWRD Ammonia Based Aeration Control - Case Study 2 10:30am-11:15am John Lindstrom, City of Pueblo 11:15am-11:45pm Derek Shockley, Xcel Energy 11:45am-12:30pm LUNCH High Efficiency Blowers - Case Study Xcel's Rebate Program 12:30pm-1:15pm Art Umble, MWH Perspectives on a Wastewater as a Resource 1:15pm-2:00pm Beverley Stinson, AECOM Deammonification - Energy Efficient Nitrogen Removal 2:00pm- 2:15pm 2:15pm-3:00pm 3:15pm-4:00pm 4:00pm-4:15pm BREAK Dale Gabel, CH2M Hill Barbara Biggs, MWRD Codigestion Case Studies - Enhancing Energy Recovery from Sludge Treatment Nutrients Limits in Light of the Paradigm Shift Occurring in Our Industry CLOSING REMARKS AND CERTIFICATES 3

4 There are five key trends for the future of wastewater treatment 4

5 A short history of wastewater treatment begins with disposal Photos from 5

6 What Could change this paradigm? 6

7 Increasing flows led to construction of sewers for disposal 7

8 Cholera, John Snow, and the advent of modern sanitation 8

9 Early wastewater treatment was focused on mitigating sanitation problems 9

10 A Sea Change the Clean Water Act 10

11 What is the next step in the evolution of the wastewater industry? Disposal Sanitation Environmental Protection Resource Recovery 11

12 Significant resources exist in wastewater 1. Chemical energy BOD/Carbon 2. Nutrients Nitrogen & Phosphorus 3. Thermal energy Heat 4. Hydraulic energy Head 5. Trace elements Metals 6. And the obvious Water! 12

13 Municipal wastewater treatment consumes 4% of the nation s electricity 100,000,000,000 kwh per year 3,200 kwh per second EPA, 2010, Evaluation of Energy Conservation Measures for WWTFs 13

14 Where does the energy go? Chlorination, WERF, 2010, Energy Efficiency in Wastewater Treatment in North America 14

15 UV disinfection adds a large energy cost WERF, 2010, and Carollo internal database 15

16 How does your plant compare to others? Energy Star Benchmarking Tool for Wastewater Portfolio Manager software used by more than 30,000 organizations Input energy use and operations characteristics Compare performance to other similar facilities Rate your plant s efficiency on a scale of 1 to

17 Increasing treatment increases energy demand Nitrification WERF, 2010, Energy Efficiency in Wastewater Treatment in North America 17

18 Significant focus of industry research on reducing energy demand 18

19 So where can we look to reduce energy demand? Aeration - opportunity for significant savings DO setpoints Deammonification Blower sizing & technology Demand charges & peak shaving Chlorination, 19

20 But what about energy production? Typical biosolids have a heat value of ~8,000 BTU per dry pound About the same as low grade coal 1 dry pound 2.3 kwh Anaerobic digestion converts some of this energy to biogas Biogas ~600 BTU/CF; Natural gas ~1,000 BTU/CF 1 MG WW 10,000 CF biogas 1,760 kwh 20

21 Conventional Digestion cf biogas lb solids feed Advanced Digestion Supplemental Fuel Addition When does cogeneration make sense? Industry experience Anaerobic digestion becomes costeffective at about 10 mgd Energy recovery becomes costeffective at about 20 mgd

22 EBMUD Net zero energy 22

23 $/Million BTU Carbon and biogas have the potential to replace higher value products $40.00 May be the Future of the Industry $35.00 $30.00 $25.00 $20.00 $15.00 $10.00 Heating Digesters Cogeneration Opportunity to Offset Supplemental Carbon $5.00 $0.00 Natural Gas Electricity Methanol Gasoline Diesel 23

24 Nutrients valuable enough to pay for! 15 pounds of ,000 gallons for N 3,600 gallons for P 24

25 Peak Phosphorus? 17 million tons/year used in agriculture 90% of world s known reserves in five countries US, China, Morocco, Jordan, and South Africa Estimated 30 year supply 65% of US supply in one mine in Tampa, FL Significant price inflation Unlike fossil fuels, can be reused 25

26 New nutrient regulations in Colorado Reg 85 (Existing Facilities) Parameter TIN (nitrate + nitrite + ammonia) TP Annual Median 15 mg/l 1.0 mg/l Reg 85 (New Facilities) Parameter TIN (nitrate + nitrite + ammonia) TP Annual Median 7 mg/l 0.7 mg/l Reg 31 (Longterm impacts) Parameter Rivers Lakes TN 2.0 mg/l 0.9 mg/l TP 0.2 mg/l 0.08 mg/l 26

27 When you remove nutrients from wastewater, where do they go? 100% 15% Gravity Thickener 20-50% Land Application 85% Concentrated dewatering side streams ~1,000 mg/l as N ~150 mg/l as P 27

28 For once, we want struvite Magnesium ammonium phosphate NH 4 MgPO 4 6H 2 O ~ fertilizer equivalent Benefits Recover nutrients High % of P Moderate amount of N Reduce chemical use & aeration Energy efficient Enhanced process stability 28

29 Wastewater should no longer be considered a wastestream but a resource Wastewater treatment uses a lot of energy; much of this energy use can be directly offset Improved efficiency Increased production Nutrient removal demands significant capital and operating investment Aeration is over 50% of WW energy demand Nutrient recovery is an emerging direction 29

30 Energy resources Consortium for Energy Efficiency EPA Energy Efficiency ency.cfm WERF

31 This seminar is focused on advances in energy and resource recovery in wastewater 7:30am-8:00am Speaker INTRODUCTIONS Topic 8:00am-8:45am Jeff Berlin, Carollo Reinventing Wastewater: From Wastestream to Resource 8:45am-9:30am 9:30am-9:45am Bill Hoyt, Colorado Springs Utilities BREAK Ammonia Based Aeration Control - Case Study 1 9:45am-10:30am Craig Barnes, MWRD Ammonia Based Aeration Control - Case Study 2 10:30am-11:15am John Lindstrom, City of Pueblo 11:15am-11:45pm Derek Shockley, Xcel Energy 11:45am-12:30pm LUNCH High Efficiency Blowers - Case Study Xcel's Rebate Program 12:30pm-1:15pm Art Umble, MWH Perspectives on a Wastewater as a Resource 1:15pm-2:00pm Beverley Stinson, AECOM Deammonification - Energy Efficient Nitrogen Removal 2:00pm- 2:15pm 2:15pm-3:00pm 3:15pm-4:00pm 4:00pm-4:15pm BREAK Dale Gabel, CH2M Hill Barbara Biggs, MWRD Codigestion Case Studies - Enhancing Energy Recovery from Sludge Treatment Nutrients Limits in Light of the Paradigm Shift Occurring in Our Industry CLOSING REMARKS AND CERTIFICATES 31