VAAWWA / VWEA Water Reuse Conference

Transcription

1 VAAWWA / VWEA Water Reuse Conference June 8, 2010 The Cultural Arts Center at Glen Allen Reuse Programs in Virginia What s Happening Around the State? Malcolm Pirnie, Inc. All Rights Reserved

2 Three Projects in Various Stages Dominion Virginia Power Chesterfield Power Station (Operational) New Kent County Chickahominy Reuse System Modifications in Colonial Downs Service Area (Construction) Alexandria Sanitation Authority Reuse Market Assessment in the City of Alexandria (Planning)

3 Dominion Virginia Power Chesterfield Direct Reuse Project for Dominion Virginia Power s Air Emissions Control Project (Sulfur Dioxide Limits) Coincided w/ planning for Chesterfield County s Proctors Creek WWTP Nutrient Upgrades (Nitrogen and Phosphorous Limits) Power Station

4 Dominion Virginia Power Chesterfield Power Station Agreement between Dominion Virginia Power and Chesterfield County signed in 2007 Chesterfield County Provide treated effluent at no cost MGD Dominion Virginia Power Interconnect w/ Proctors Creek WWTP Effluent Line Construct and operate interconnection chamber, pump station and pipeline Assume nutrient loadings in the wastewater received from Proctors Creek WWTP

5 Water Treatment Plant James River VPDES Pond Housing Proctors Creek WWTP 17 MGD 7.5 MGD 9.5 MGD Dominion Virginia Power Chesterfield Power Station Scrubber Byproduct Is Gypsum

6 Dominion Virginia Power Chesterfield Power Station Construction in 2007 Preceded Virginia Reclamation and Reuse Regulations Reviewed by VDEQ (PRO) and deemed to meet the intent of water reuse regulations being drafted Reuse Discharge under Dominion Power s VPDES Permit Reuse System Capacity Design = 9.5 MGD Current Use = ~ 1.5 MGD (1 scrubber online)

7 Dominion Virginia Power Chesterfield Power Station Interconnection Effluent Line

8 Dominion Virginia Power Chesterfield Power Station Completed Interconnection Pump Station

9 Dominion Virginia Power Chesterfield Power Station Benefits Reduce nutrient discharges to the James River/Chesapeake Bay from the Proctor s Creek WWTP Reduction sulfur dioxide emissions from the Chesterfield Power Station Cost saving for Dominion by using consistent high quality reuse effluent vs. onsite treatment or purchase US Gypsum in Norfolk renovated plant and uses byproduct for manufacturing vs. closing plant (300 jobs)

10 Dominion Virginia Power Chesterfield Power Station Benefits (cont.) Preserves capacity in Proctors Creek WWTP for future customers Consistent, year round reuse demand with no seasonal limitations Provides Chesterfield County the potential opportunity to lease nutrient credits Nutrient Exchange Buyer Prices (03/09) Class A = $4P / $2N Class B = $6P / $3N

11 New Kent County Chickahominy Reuse System Modifications New Kent County DPU currently operates two WWTPs Parham Landing WWTP Chickahominy WWTP The County decided to centralize their wastewater treatment system Shut down the Chickahominy WWTP Reroute influent flows to the Parham Landing WWTP Expand/upgrade the Parham Landing WWTP to 2 MGD

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13 New Kent County Chickahominy Reuse System Modifications Parham Landing WWTP Design Q = MGD Average Annual Daily Flow (AADF) ~ 90,000 gpd Options for Discharge Pamunkey River Effluent Total Phosphorus (TP) Limit = 0.7 mg/l starting January 1 st, 2011

14 New Kent County Chickahominy Reuse System Modifications Chickahominy WWTP Design Q = MGD AADF ~ 180,000 gpd Options for Discharge Brickshire Golf Course or Colonial Downs Racetrack for irrigation/dust control Rumley Marsh Rumley Marsh Effluent TP Limit = 0.1 mg/l Currently under consent order until 2012 Operational Challenges

15 o Chickahominy WWTP Legends Well Colonial Downs Well

16 New Kent County Chickahominy Reuse System Modifications Options for Bulk Irrigation Sources Use Chickahominy WWTP as satellite facility Not enough flow to sustain Parham Landing WWTP 2 MGD design (size required for waste load allocations) Substantial upgrades required to meet new Level 1 standards Potable Water New Kent County is in the Eastern Virginia Groundwater Management Area Only demands for beneficial use considered in the renewal of Colonial Downs service area groundwater permit

17 New Kent County Chickahominy Reuse System Modifications Options for Bulk Sources (cont.) Treated Effluent from Parham Landing Requires 10.5 miles transmission main to convey back to Colonial Downs area Equalization Storage required at Chickahominy WWTP site

18 New Kent County Chickahominy Reuse System Modifications Third Option (Conveying Treated Effluent from Parham Landing) considered most feasible Modified Reuse System Capacity Parham Landing WWTP Effluent PS and Transmission Force Main = 2 MGD Modified Chickahominy Reuse System = 0.50 MGD

19 New Kent County Chickahominy UV Disinfection Reuse System Modifications Parham Landing Reclaimed Water PS Cl 2 Reclaimed Water Force Main Reclaimed Water Storage (Chick. WWTP) Colonial Downs Storage Brickshire Storage New Pipe Existing Pipe Legend Royal New Kent Storage Cl 2 Contact Tank Online Turbidimeter Online Cl 2 Residual Meter Sample for BOD, enterococci, and ph Chickahominy WWTP Effluent PS Parham Landing WWTP for retreatment Cl 2

20 New Kent County Chickahominy Reuse System Modifications Project timeline Design commenced fall 2008 (reclaimed water management and force main design) Design of Chickahominy modifications summer 2009 Bids received early September 2009 Construction currently underway Parham Landing WWTP Reclaimed Water Force Main Chickahominy WWTP Reuse System Improvements Anticipated construction completion end 2010

21 New Kent County Chickahominy Reuse System Modifications

22 New Kent County Chickahominy Reuse System Modifications

23 New Kent County Chickahominy Reuse System Modifications

24 New Kent County Chickahominy Reuse System Modifications Funding & Finances Planning/Design by New Kent County DPU Construction through VDEQ Clean Water Revolving Loan Fund (via ARRA) Approximately $4.0 million received for both projects Principal forgiveness loans (no capital debt) Rates TBD

25 New Kent County Chickahominy Reuse System Modifications Benefits Elimination of discharge into Rumley Marsh (James River Basin) Reduction of nutrients discharged into Pamunkey River (York River Basin) Reduction of use of groundwater for bulk irrigation purposes Provides the potential opportunity to lease nutrient credits Potential to expand system and serve future reclaimed water customers as flows increase

26 Alexandria Sanitation Authority Reuse Market Assessment Project Overview The City of Alexandria has requested up to possibly 12 MGD of additional treatment capacity for development by In response Alexandria Sanitation Authority (ASA) will have to expand treatment plant design capacity from 54 to 66 MGD while maintaining compliance with load caps for total Nitrogen (TN) and total Phosphorus (TP)

27 Alexandria Sanitation Authority Reuse Market Assessment Project Overview (cont.) ASA s current TN & TP removal rates are already approaching technological limits On January 1, 2011 TN & TP load caps will be enforced as ASA s permit limits for discharge into the Chesapeake Bay watershed

28 Alexandria Sanitation Authority Reuse Market Assessment Project Overview (cont.) Market Assessment to evaluate the feasibility of using water reuse to divert a portion of ASA s effluent to various uses throughout the City of Alexandria and surrounding areas and avoid discharging TN & TP to the Chesapeake Bay therefore maintaining compliance with load caps.

29 Alexandria Sanitation Authority Reuse Market Assessment Methodology Review of Quarterly Water Consumption Records (supplied by the City of Alexandria) Review of GIS Parcel Land Use Databases (supplied by the City of Alexandria) Calculate Future Potential Reclaimed Water Demand for selected land use areas Identify Potential Users Outside of the City

30 Alexandria Sanitation Authority Reuse Market Assessment Results 25,000 water accounts revealed two potential significant users ( eastern and western users) Identified potential users at specific lateral distances from a conceptual future reclaimed water distribution pipeline from ASA to large end users

31 Alexandria Sanitation Authority Reuse Market Assessment Eastern User

32 Alexandria Sanitation Authority Reuse Market Assessment Western User

33 Alexandria Sanitation Authority Reuse Market Assessment Other Potential Reclaimed Water Uses Identified Public Golf Course Approximately 150 Acres of Pervious Area 1 Mile South of ASA Off-line storage via existing holding ponds for non-growth months Bulk Reuse Water Fill Station Customers pick up and haul reuse water Set up quickly (4 to 6 months) for little cost Social education to the public on reclaimed water

34 Alexandria Sanitation Authority Reuse Market Assessment Western Option: Eastern Option: Golf Course Option: 0.79 MGD (Annual) 0.17 MGD (Annual) 0.21 MGD (Annual) 1.17 MGD (Annual)

35 Alexandria Sanitation Authority Reuse Market Assessment Total future demands (based upon current redevelopment plans) Future : ~1.90 MGD (Annual) Total potential demands (current +future) Current: Future : 1.17 MGD (Annual) ~1.90 MGD (Annual) ~3.07 MGD (Annual)

36 Alexandria Sanitation Authority Reuse Market Assessment Project Status Currently planning phased project approach Evaluating sewer mining and satellite treatment in conjunction with interceptor capacity planning

37 Acknowledgements Larry Dame, Director of Public Utilities, New Kent County Harold Jones, Operations Superintendent, New Kent County Jeffrey Sparks, Engineer, Malcolm Pirnie (RIC) Max Chance, Engineer, Malcolm Pirnie (RIC) Bill Barrack, Engineer, Malcolm Pirnie (WDC)

38 Questions? Kris D. Edelman, P.E. Senior Project Engineer Malcolm Pirnie - Richmond Office Ph: kedelman@pirnie.com Malcolm Pirnie, Inc. All Rights Reserved