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NATURAL SYSTEMS UTILITIES …A Better Way NATURAL SYSTEMS UTILITIES …A Better Way Comprehensive Facilities Services Water Reuse in Sewered Areas – March 8, 2019 Presented to: MWRA Wastewater Advisory Committee Presented by: Bruce Douglas New Jersey Office-HQ New England Offices Western Office Central Office 170 Township Line Rd, Bldg C 21 Father DeValles Blvd, #107 1537 Main St 477 Devlin Road, Suite 107 17818 Hwy 65 NE, Suite 100 Hillsborough, NJ 08844 Fall River, MA 02723 Brewster. MA02631 Napa, CA 94558 Ham Lake, MN 55304 Terminology for Presentation : • Wastewater – mixed sewage from Building Sanitary Drains (non- industrial) • Blackwater – Subset of Wastewater Derived from Toilets, kitchen Sink & Dishwasher • Greywater – Restricted to non- blackwater sources: Bathroom Sinks, showers, bathtubs, clothes washers, and laundry sinks • Non-Potable – Fit for purpose Reclaimed Water, suitable for uses, such as: Irrigation, Cooling Water, Toilet Flushing, Vehicle Washing, Commercial Laundries, Fire Suppression, Snow-making, etc MWRA Regulatory Change Request May 17, 2018 •“10.023: Specific Prohibitions • No Person shall discharge, or cause or allow to be discharged, directly or indirectly, into the Authority Sewerage System, any of the following:…” • “(13) Any Sludge, except: a. from a water treatment plant owned and operated by a municipality, or by a water district created by a special or general act of the Massachusetts Legislature, and when specifically permitted by the Authority pursuant to 360 CMR 10.057 ,or b. from a water reclamation facility discharging directly to a municipal sewer within the MWRA service area, approved within the Commonwealth of Massachusetts’ Reclaimed Water Permit Program And Standards (314 CMR 20), and when specifically permitted by the Authority pursuant to 360 CMR 10.000.” Gillette Stadium & Patriot Place 250,000 gpd Water Reuse System Case Study: Battery Park, NYC In Building Water Reuse & Thermal Energy Recovery Reuse Applications: Toilet Flushing Cooling Tower Make-Up Water Landscape Irrigation Laundry 5 WHY INCLUDE THIS EXEMPTION? • Enable onsite water reuse in the MWRA sewer service area for the following applications: Onsite Water Reuse Sewer Mining • Provide non-potable water for Irrigation, Cooling Water, Toilet Flushing, Commercial Laundries, Etc. • Enable Significant Water Conservation • Net Zero Energy water reuse associated with Thermal energy recovery • Provide for Increased Resiliency to Drought Figure 1.1Water Reuse Treatment General Process Flow Overview Sanitary Waste- Non-Potable water Reuse Onsite Reuse Treatment System Boundary Reuse Storage Recirculation Primary 2° and 3° Solids Disinfection Treatment Treatment Separation MLSS City Gravity Overflow Sewer Figure 1-2 Onsite Water Reuse Treatment Process Flow Building Sanitary Waste- Non-Potable water Reuse Onsite Reuse Treatment System Boundary Absorption Reuse Heat Pump Storage Membrane Cleaning Solutions Recirculation Trash Trap Anoxic & Membrane Tank Ozone & & Screen Aeration Tanks & Membranes UV Gravity MLSS Fine Screenings To Solid City Waste Bin Overflow Sewer Figure 1-3 Onsite Water Reuse Treatment Process Flow Building Plus Cleaning solution Recirculation5 Sanitary Waste- Non-Potable water Reuse Onsite Reuse Treatment System Boundary Absorption Reuse Heat Pump Storage Membrane Cleaning Solutions3 Recirculation Tank Cleaning4 Trash Trap Anoxic & Membrane Tank Ozone & & Screen Aeration Tanks & Membranes UV MLSS1 NOTES: TT Cleaning2 1. MLSS Discharge frequency can be set by timer: hourly to monthly City 2. TT Cleaning frequency is typically quarterly, but can be weekly 3. Membrane backwash and cleaning is automated Fine 4. Reuse Tank Cleaning is generally performed annually Screenings Gravity Overflow Sewer To Solid 5. Revisions (1/24/19) are underlined . Waste Bin Table 1-2 Urban Onsite Water Reuse Typical Discharges to Collection System1 • Daily frequency (continuous) Routine Sewer • 50% to 10% of Indoor Use Discharge • Typical Sanitary Sewage • Frequency can be set by timer, i.e., hourly Mixed Liquor • ~1% of reclaimed water production 2 Suspended Solids • Total Solids = 1% to 1.5% • Quarterly typical frequency, can be reduced Trash Trap Solids 2 • 5,000 to 10,000 gallons • Total Solids = 1% – 5% • Annual or greater typical frequency Reuse Storage • BOD & TSS <<< Typical Sanitary Tank Cleaning Sewage 11/24/2019 Revisions are underlined 2Will not be released during CSO event Example Daily Loads for Projects Without Reuse, With 50% Onsite Reuse and Sewer mining Total Suspended Solids Resulting Solids Load Flow to City Sewer Concentration (mg/L)1 (lb/day) System Type Component GPD MGD low med high low med high Raw Sewage 50,000 0.05 100 220 350 42 92 146 Without reuse Total Solids 42 92 146 Load Raw Sewage 25,000 0.025 100 220 350 21 46 73 50% onsite In-building reuse 250 0.00025 8,000 10,000 12,000 17 21 25 Reuse Total Solids 38 67 98 Load Raw Sewage (100,000) (0.1) 100 220 350 (83) (183) (292) MLSS (Total Sewer 1,000 0.001 8,000 10,000 12,000 67 83 100 Mining Solids Load) Net Solids Load (16) (100) (192) Difference 1Raw sewage Total Suspended Solids (TSS) concentrations from Metcalf & Eddy Daily Solids Loads‐ With/Without Reuse Applications NSU Scenario 1: No Reuse Deer Island WWTP 50,000 GPD Sewer Collection 92 lbs/day Solids* + 92 lbs/day Scenario 2: 50% Reuse Deer Island WWTP 50,000 GPD Sewer 25,000 GPD Collection 92 lbs/day 46 lbs/day Solids* Solids* Water Reuse 25,000 GPD + 67 lbs/day 27% Solids Reduction 46 lbs/day Solids* Carbon dioxide, Water, Nitrogen, Soluble Solids, etc. 25 lbs/day Solids* * Solids refer to total suspend solids (TSS) * Assume TSS of 220 mg/L ** 1% waste sludge Daily Solids Loads‐ With/Without Reuse Applications NSU Scenario 3: Sewer Mining Deer Island WWTP Sewer Collection Sewer Mining Water Reuse 100,000 GPD + 83 lbs/day 45% Solids Reduction 183 lbs/day Solids* Carbon dioxide, Water, Nitrogen, Soluble Solids, etc. 100 lbs/day Solids* * Solids refer to total suspend solids (TSS) * Assume TSS of 220 mg/L ** 1% waste sludge Figure 1-4 Overview of Parallel Permitting Processes Municipal Water & Sewer Department(s)/Commission Water & General W&S Municipal Sewer Installation Service Review Inspections Applications Process Connection Approvals Municipal Inspectional Services State Plumbing Building Permit Local Approvals Application (w/ Board Reuse for WWTP & Building Full Set of Inspections System Construction Reuse Plumbing Approval Dwgs.) Massachusetts Department of Environmental Protection Right Water for the Right Use NSU Sustainability & Resiliency Rising Costs Competing Demand Wastewater Capacity NATURAL SYSTEMS UTILITIES …A Better Way Comprehensive Facilities Services Thank you! [email protected] Q&A New Jersey Office-HQ New England Offices Western Office Central Office 2 Clerico Lane, Building 1 21 Father DeValles Blvd, Suite 107 1573Main St 477 Devlin Road, Suite 107 17818 Hwy 65 NE, Suite 100 Hillsborough, NJ 08844 Fall River, MA 02723 Brewster MA 02631 Napa, CA 94558 Ham Lake, MN 55304.
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