NEW YORK STATE: WASTEWATER DIGESTER POTENTIAL. June 6, 2016 George Bevington

Transcription

1 NEW YORK STATE: WASTEWATER DIGESTER POTENTIAL June 6, 2016 George Bevington

2 SSO Mandate? Source Separation of Organics (SSO) from the solid waste stream already mandated at adjacent states Institutions first, household level eventually If SSO mandated in NYS, do we have Anaerobic Digestion capacity?

3 If SSO mandated, 21% to 24% of the disposed MSW tonnage is Food Waste

4 How Much Organics in NYS Garbage? Source: DEC website, 2008 data Landfill 6,000,000 Tons/Year Combustion 2,500,000 Tons/Year Export for Disposal 6,100,000 Tons/Year Total MSW disposed 14,600,000 Tons/Year Organic 24% 3,504,000 Tons/Year

5 Recycling Rate for Organics? 3,504,000 Total Organics TPY If 25% rate, then 876,000 TPY for digestion If 50% rate, then 1,752,000 TPY for digestion

6 Do we have AD capacity today in NYS? If 50% rate, then 1,752,000 TPY for digestion

7 AD Options: At a WWTF At a Landfill Anaerobic Digestion Location At a Farm Location of AD important: reasonable haul distance At a Compost Facility

8 Many Farm Locations, some with AD:

9 Typical Farm Digester:

10 Farm AD Potential Capacity Number Mature Dairy Cattle Total Number of Farms Between 700 and Between 1000 and Between 1500 and Over large farms, but only 24 with operating digesters Source: DEC 2012 Compliance Reports

11 Network of Wastewater Digester Locations (NYSERDA) NYS WWTPs w/ Existing Anaerobic Digestion Facilities (145)

12 Medium to Large Plants: 53 wastewater treatment plants in NYS have AD already, each plant 4 MGD size or larger Several existing plants already co-digest organics, generating additional biogas and electrical power Other plants considering AD and co-digestion: Oneida County adding AD Albany County considering adding AD Others in discussion How about at a 3 MGD plant???

13 Co-Digesting SSO at a Wastewater Treatment Plant Wastewater Sludges Biogas Anaerobic Digester Source Separated Organics

14 How to Expand Capacity? Build New Repurpose

15 Technology to Increase Capacity Case Study: Existing Digesters at capacity Repurpose existing tanks: add 15,000 GPD capacity Add digester thickening: add 50,000 GPD capacity Improvements would allow municipality to handle all SSO in the vicinity Digester 7% TS 3% TS Gravity Belt Thickener

16 Power Generation Biogas 55 to 65% methane Renewable fuel source for electrical generation Governor s State Energy Plan goal of 50% renewables by 2030 Longer-term goal of decreasing carbon emissions SSO to AD could assist meeting ambitious goal

17 Expand Capacity at a Wastewater Treatment Plant for SSO? Do I invest $ millions and build capacity now? But SSO legislation might not happen, how do I pay for improvements? Need guarantee organics come to my plant Better wait

18 Factors Influencing Decision Long term organic SSO contracts? SPDES permit Tipping fee generation Capital Projects: Priority? Facility Mission? Energy Costs Grant Availability Size Size

19 Steps towards building more AD Capacity Need stable organic waste streams to arrive at wastewater plants for co-digestion Assumption is that Solid Waste systems collect and pretreat the SSO organics, removed debris, and deliver the organic goo to wastewater receiving stations Financial tools: tipping fees and favorable energy sales can potentially make AD projects self funding Projects will typically advance if finances create positive cash flow Few projects will advance on environmental attributes alone

20 Private Sector Comments: At 12 cents/kwh for renewable energy, multiple investors and technology providers will be interested in constructing capacity throughout New York State Need to provide ample energy payment to encourage investment in wastewater and farm AD co-digestion projects Current payment for power export in NYS wholesale rate, say 2 to 3 cents per kwh

21 Official Score 6,000 to 200: AD in NYS 145 AD at wastewater 23 AD at farms?? Industrial AD Total: ~200+ AD in Germany ~6,000 digesters constructed and operational

22 Questions?