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HomeMy WebLinkAboutWWR_HDR_11_28_07.pdf MORMON MMRLE,ING (: } €€:t;,:�:.:.::s,i::ii:i'i ,..;'FI}i• =,:F { }}�#{:lit �'•il ii:ti(jiii}i�ii=FF: � F i�{{ I i i ::..............:.:.:.:.a::aFtSFiEj'i'r i .rrtq•i h( p. _ .................. Carbon Equivalent Analysis Bozeman WRF Phase I Expansion • ........ ......... ........ . ... ......... ..................... ii ��:. 1VI RLE,INC. Carbon Equivalent Calculations — Bozeman WRF Upgrade Specific Sustainable Design Concepts • Premium Efficiency Motors o All new motors provided in the facility will be 'premium' efficiency (92%)versus 'standard' efficiency(88%) motors. o All replacement motors provided in the facility will be 'premium' efficiency(92%) versus 'standard' efficiency (88%) motors. • Biosolids Hauling Reduction o City currently hauls 7,700,000 gallons of liquid sludge to the land application sites at 6,000 gallons of biosolids per load,travelling approximately 8 miles round trip with each load. This equates to approx. 1,280,trips per year and 10,300 miles of trucking. o This project will reduce the amount of trucking required, by dewatering the biosolids prior to land application. It is expected that the dewatered biosolids will be reduced by the dewatering facilities to approximately 5,400 cubic yards of material. This material will still be hauled in trucks to the land application sites, but would result in approximately 550 trips per year and 4,400 miles of trucking. This results in roughly 5,900 miles less of truck hauling at startup. Assuming that the trucks average 6 miles per gallon, I would estimate the savings to be approximately 985 gallons of fuel annually would be saved. • Existing Blower Replacement o The design team has proposed to replace the existing conventional centrifugal blowers with new blowers that have much greater efficiency. We are replacing the three 200 Hp blowers (2 operating most of the time with a third backup) that currently operate at about 83%efficiency including motor and mechanical equipment. They will be replaced with four bigger units that operate at are approximately 95%efficiency including motor and machine. The savings in energy here is the operation of 400 Hp at 95%efficiency versus at 83% efficiency.This will also increase the capacity of the plant which is needed for future growth in Bozeman. MORRISON l MAIERLE,INC • Anaerobic Digester Waste Gas Reuse o This project will re-use the waste gas to heat the existing digesters, as well as the Administration/Lab Building, the Solids Dewatering/Digester Control Building #2, the UFAT Pumping Station and possibly a Heat Recovery Ventilator in the Headworks Building. These buildings would otherwise be heated by fossil fuels if the waste gases were not utilized. The Administration/Laboratory Building will also be cooled using the waste gas via a hot water cooling system. • Micro-Turbine Power Generation o The jury is still out whether installation of a micro-turbine would make sense. At this time, there is insufficient biogas production to operate the smallest available micro-turbine which is approximately 230 KW in ` size. However, a micro-turbine could be installed now at a price of approximately$850,000-$1,000,000 and expect that they will need to augment with natural gas until approximately 2020. This would require a significant amount of financial assistance from the electrical utility for it to pencil out. Even so, there is a savings since approximately 75%of the biogas produced would be flared. These savings are not incorporated into the following carbon calculations. • Heat Recovery Ventilator in Headworks Building o The new headworks building will require significant, constant ventilation. To offset this energy use an air-to-air heat recovery unit will be considered in the design. This unit will recover a significant amount of energy from the ventilation load and will also be served with a heating loop provided by the Anaerobic Digester Waste Gas burner. These savings are not incorporated into the following carbon calculations. -aa ! !� MoRRisoN dill! s MAIERLE,INC Overview of Calculations and Assumptions Existing Facility (2005) • All existing process equipment • Existing building heating loads (taken from 2000 values provided by Hattie Baker) • Existing Biosolids Hauling Requirements (diesel fuel) • 5,800,000 gallons per day capacity Baseline Facility Expansion (2015) • All existing process equipment • Existing building heating loads (taken from 2000 values provided by Hattie Baker) • All new process equipment at standard efficiencies • Administration/Lab Building Heating and Cooling Load • Solids Dewatering/Digester Control Building#2 Heating Load • UFAT Pumping Station Building Heating Load • Existing Biosolids Hauling Requirements (diesel fuel) without dewatering • 8,500,000 gallons per day capacity Proposed Facility Expansion_(20151 • All existing process equipment(that is not being replaced) • All replacement process equipment (Blower & Sludge Pump Replacement) • All new process equipment at premium efficiencies • Anaerobic Digester Waste Gas Reuse Savings (heating/cooling load for buildings) • Existing Biosolids Hauling Requirements (diesel fuel) without dewatering • Micro-turbine Power Generation • 8,500,000 gallons per day capacity l!'MORRISON •. AWN MAIERLE,INS General Assumptions and References Table 1: Fossil Fuel Use 4 Carbon Conversion factors: Fuel Carbon(C) Geographically-Based Participants Facility-Based Participants Conversion Factor& (city,county) (company,NGO,government use) Source Natural gas 3.174 lbs C/therm or Annual natural gas sales(therms) Annual natural gas sales to the 11.64 lbs CO2 per within the city or county multiplied facility multiplied by 11.64 lbs CO2 therm(EPA by 11.64 lbs CO2 per therm divided per therm divided by 2000 lbs/ton. Workbook 1995) by 2000 lbs/ton. Gasoline 5.30 lbs C/gallon or Annual gasoline sales(gallons) Annual gasoline usage by facility 19.43 Ibs CO2 per within the city or county(from fleet(gallons)multiplied by 19.43 gallon(EPA Board of Equalization)multiplied by lbs CO2 per gallon divided by 2000 Workbook 1995) 19.43 lbs CO2 per gallon divided by lbs/ton. Fleet usage determined by 2000 lbs/ton. sales invoices. Employee commute mileage(if measured)to be determined by participant. Diesel 5.74 lbs C/gallon or Annual diesel sales(gallons)within Annual diesel usage by facility 21.05 Ibs CO2 per the city or county multiplied by fleet(gallons)multiplied by 21.05 gallon' 21.05 lbs CO2 per gallon divided by lbs CO2 per gallon divided by 2000 2000 lbs/ton. lbs/ton. Fleet usage determined by sales invoices. Electricity Annual PG&E-specific Annual electricity sales(kWh)within Annual electricity sales(kWh) electric generation the city or county multiplied by within the facility multiplied by portfolio determines appropriate factor divided by 2000 appropriate factor divided by 2000 weighted average lbs lbs/ton. lbs/ton. CO2 per kWh sold in Santa Clara County (from CEC and SVEP) http://www.sustainables!Iiconva[ley.ore/docs/CO2 Emissions and Reporting Protocol.doc Table 2: Fossil Fuel Use 4 Carbon Dioxide Emissions Coal Fired Power Plants .104 Tons of CO2 Per Dekatherm Oil Fired Power Plants .087 Tons of CO2 Per Dekatherm Natural Gas Fired Power Plants .058 Tons of CO2 Per Dekatherm http://www.nrdc.org Equation 1: Solve for Kilowatt Hours per year 746 x MotorPou'er(HP)x LoddFactor(%) Hours Days x OperatingTi►r�e(%)x 24 x 365 Efficiency(%) Dav Yeai- http://www.copper.org/applications/electrical/energy/motor text.html .. ....... .......................... ............... .. ! MOFTUSON MAIERLE,�� Summary of Carbon Equivalents for Existing, Baseline and Proposed Facility Existing Facility(2005) 5,800,000 Gallon/Day Capacity KWH DKTherms Gal.Diesel Tons CO2/year Gallons/Ton CO2 Existing process equipment 5,624,410 - 1,995.8 Existing facility building heating* 21,293 - 7.6 Existing Biosolids Hauling - 1,717 18.1 Totals 5,645,703 1,717 2,021 10047,274; *These values taken from information provided by Hattie Baker Baseline Facility(2015) 8,500,000 Gallon/Day Capacity KWH DKTherms Gal, Diesel Tons CO2/year Gollons/Ton CO2 Existing process equipment 5,624,410 1,995.8 Existing facility building heating* 21,293 7.6 New Process Equipment** 4,783,887 - 1,697.6 New Administration Heat/Cool 21,319 201 - 19.2 New Solids Dewatering Heat/Cool 37,687 355 34.0 New UFAT Pump Station Heat/Coo[ 4,397 41 - 4.0 Existing Biosolids Hauling - - 1,717 18.1 Totals 10,492,992 998 1,717 1 3,776 it 821602 *These values taken from information provided by Hattie Baker **This equipment calculated using standard efficiency motors Proposed Facility(2015) 8,500,000 Gallon/Day Capacity KWH DKTherms Gal.Diesel Tons CO2/year Gallons/Ton CO2 Existing process equipment* 2,740,257 972.4 Existing Equipment Replacement 2,884,153 Existing facility building heating* 21,293 7.6 New Process Equipment*** 4,570,172 1,621.7 New Administration Heat/Cool"" 100 0.0 New Solids Dewatering Heat/Cool**** 177 0.1 New UFAT Pump Station Heat/Cool'*** 21 - - 0.0 New Biosolids Hauling - 733 7.7 New MicroTurbine Power Generation - - Totals 10,216,172 - 733 2,609 *This is equipment that is not being replaced **These values taken from information provided by Hattie Baker —This equipment calculated using premium efficiency motors *—Estimated pumping cost.Heating/Cooling provided by Anaerobic Digester Waste Gas burner M ccpp Mr�,pp �� O( (OD tit-M NN OU'1 �` u0i (O �001 CMOGo F-00 eN- ��MMlO wln O d' M MIS M4'){1� (o0 (� t00O�OM [7 N (D<O 1-f- (O 'ct (7 N CJ1 Q r w M M Q Q M N M O (p V M M rV' (D N M M M M N O M 0 0 0 0 o a o 0 o a o 0 0 o a 3�o 0 0 0 00 o ge e s e e e ge e,' e o e e e m m w wm mIO m Ul>lO In N(O IO (O (O(O 47 NCO 0(O tO N In N(O=n Nen SON tt� 00([)470 . wwwww wwww 00w wco co a0 co co 00 ww co co rococo row w cow co co row co w co co c0 n r0-. \� \e \p a e o o o e e o n oe a ���e� o . $ $� o o oY�000 ova a` o0 C,e o 0 oe a o0 oe o� o� e o O d�O 0 ONO 0 0 0 N d d 0 4 4 O (D (O L O O N 4 4 �O U O 4 O O L O O N P oU, O Q C O ❑ S W � f- x x x x x x x x x x x x X x x x x x x x x x x x x x x x x x x (-- a E 67 eseeaveIjz va�o vove oven eve oaaoo oa o00000 Z o w w w w w w w co ao w o w oo CO w w w o w w 00 00 co w o co 0o 00 00 ao 0o 0 00 co 0o 0o w co Qc� rnwGoDo cocococowww m now wwww mcococo coww mco wco row mOD row co co w U]w r N (v(p OCNDONNiO (OMOin�� N(!'1� q LQ Ur tO NU, ddQ NpM10 lf! 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WWTP Longbow Lane Lift Station Laurel Glen15485 Saxon Way Waste water operations SW of sunrise campground 439 hospitality 4,319.00 WWTP 2245 Springhill Rd 7,036.00 27.20 WWTP 2245 Springhill Rd Unmetered Lights 864.00 $ 119.00 WWTP Admin Bldg PO Box 1230 20,738.00 WWTP 255 Moss Bridge Road 2,817,560.00 WWTP PRIMARY TRTMT BLDG 235.30 WWTP MAINTENANCE BLDG 292.80 2,829,779 1,004 21,293 8 KWH TONSCO2 KWH TONSCO2