CDW Example Comparing Extended Air vs SBR

8/3/2019 CDW Example Comparing Extended Air vs SBR

http://slidepdf.com/reader/full/cdw-example-comparing-extended-air-vs-sbr 1/23

Layout Comparison Summary

Layout Name Present Worth Project Operation (/yr)

Layout 1 $59,100,000 $46,200,000 $290,000Layout (2) $42,300,000 $30,500,000 $318,000



Maintenance (/yr) Material (/yr) Chemical (/yr) Energy (/yr) Amortization (/yr)

$83,700 $315,000 $0 $606,000 $1,680,000$101,000 $110,000 $0 $580,000 $896,000



Layout 1

Summary

Equipment DatabaseSept 2007,(USA Avg)

Layout Summary

Present Worth Project Operation (/yr) Maintenance (/yr)

$59,100,000 $46,200,000 $290,000 $83,700

Process Summary

Process Construction Operation (/yr) Maintenance (/yr)

Extended Aeration Activated S $15,700,000 $120,000 $61,200Secondary Clarifier $920,000 $47,700 $22,500

Blower System $1,860,000 $0 $0Other Costs $27,700,000 $122,000 $0

Summary of Costs for Layout

Description Value Units

Other Costs

QuantitiesRequired land 20 acreAdministration labor hours 2120 hr/yrLaboratory labor hours 3470 hr/yr



Costs

DIRECT COSTSMobilization $717,000 $Site preparation $952,000 $Site electrical $2,070,000 $Yard piping $1,360,000 $Instrumentation and control $1,080,000 $Lab and administration buildin $1,690,000 $

Unit process construction cost $18,500,000 $Profit $3,950,000 $Total construction costs $30,300,000 $

INDIRECT COSTSMiscellaneous cost $1,520,000 $Legal cost $606,000 $Engineering design fee $4,550,000 $

Inspection cost $606,000 $Contingency $3,030,000 $Technical $606,000 $Total indirect costs $10,900,000 $

MISC

Cost of land $400,000 $Interest during construction $4,520,000 $

LABOR COSTSAdministration labor cost $52,900 $/yrLaboratory labor cost $69,500 $/yrUnit process operation labor c $168,000 $/yrUnit process maintenance labo$83,700 $/yr

Total labor costs $374,000 $/yr

PROJECT SUMMARYPresent worth $59,100,000 $

Total project cost $46,200,000 $Total operation labor cost $290,000 $/yrTotal maintenance labor cost $83,700 $/yr

Total material cost $315,000 $/yrTotal chemical cost $0 $/yrTotal energy cost $606,000 $/yrTotal amortization cost $1,680,000 $/yr

Summary of Air Supply System


Blower System for Entire Plant

Design InformationMinimum air flow capacity 24000 scfm

Safety factor 1.5Requested air flow capacity 36100 scfmTotal capacity of blowers 36100 scfmNumber of blowers in use 3

Total number of blowers 4Capacity of individual blowers 12000 scfmEstimated cost of an installed $376,000 $Blower building area 1880 sqftCosts



Construction and equipment c $1,860,000 $

Amortization cost $156,000 $/yrNotesEnergy costs are shown at the individual unit processes that require air

Influent Wastewater(2)

Extended Aeration Activated Sludge

Design Output Data


Extended Aeration Activated SludgeDesign InformationCarbon & Nitrification DesignDesign SRT for design at wint 25 dDesign SS 2500 mg/LCalculated VSS 1790 mg/LCalculated VSS:TSS ratio 0.714 lb VSS/lb SS

Total volume of reactors 2570000 cuftLength of parallel train 400 ftWidth of parallel train 32.8 ftSidewater depth 16.4 ft

Number of batteries 1Number of parallel trains per b 12

Number of cells within one trai 3Total number of dividing walls 24Hydraulic retention time 46.2 hrF/M ratio 0.0639 lb BOD/lb MLSS/dVolumetric BOD loading 0.114 kg BOD/m3/dObserved yield (VSS basis) 0.516 g VSS/g BODObserved yield (TSS basis) 0.723 g TSS/g BODAmount of alkalinity required 185 gCaCO3/m3

Amount of sludge generated 16100 lb/dSludge recycle rate 3.33 MGD(US)Nitrogen requirement for biom 13.8 mg/LPhosphorus requirement for bi 2.75 mg/L

Oxygen requirement to meet a 38600 lb/dAir flow required to meet avera 23900 scfmDesign air flow 9.3 scfm/1000 cuft

QuantitiesOperation labor required 4280 pers-hrs/yrMaintenance labor required 2670 pers-hrs/yrElectrical energy required 5810000 kWh/yrVolume of earthwork required 1140000 cuftVolume of slab concrete requir 340000 cuftVolume of wall concrete requir 200000 cuftHandrail length 6900 ft

Number of diffusers per train 1000Fine bubble diffuser floor cove 3.37 %

Number of swing arm headers 17CostsConstruction and equipment c $15,600,000 $Operational labor cost $107,000 $/yr

Maintenance labor cost $52,700 $/yrMaterial and supply cost $305,000 $/yrEnergy cost $581,000 $/yrAmortization cost $1,420,000 $/yrNotes



Minimum winter SRT not calculated, design SRT specified by user

The fine bubble diffuser floor coverage is less than 4.5%, consider changing the tank dimensionSludge Recycle PumpingDesign InformationAverage daily pumping rate 3.33 MGD(US)Total pumping capacity 6.67 MGD(US)Design capacity per pump 3.33 MGD(US)Number of pumps 3

Number of batteries 1Firm pumping capacity 3.33 MGD(US)QuantitiesOperation labor required 514 pers-hrs/yrMaintenance labor required 430 pers-hrs/yrElectrical energy required 223000 kWh/yrVolume of earthwork required 2650 cuftArea of pump building 331 sqft

CostsConstruction and equipment c $149,000 $Operational labor cost $12,800 $/yrMaintenance labor cost $8,490 $/yr

Material and supply cost $1,050 $/yrEnergy cost $22,300 $/yr

Amortization cost $14,100 $/yr

Secondary Clarifier

Design Output Data


Secondary ClarificationDesign InformationSurface area 20000 sqft

Surface area per circular clarifi 10000 sqftDiameter of each circular clarifi 113 ftNumber of clarifiers per battery 2Number of batteries 1

Solids loading rate 13.9 lb/(sqft·d)Hydraulic retention time 3.23 hrWeir length 667 ft

Volume of wasted sludge 0.187 MGD(US)QuantitiesOperation labor required 1550 pers-hrs/yrMaintenance labor required 860 pers-hrs/yrElectrical energy required 12200 kWh/yrVolume of earthwork required 280000 cuftSlab thickness 10.2 inVolume of slab concrete requir 19100 cuft

Wall thickness 11.5 inVolume of wall concrete requir 7360 cuft

CostsConstruction and equipment c $875,000 $Operational labor cost $38,800 $/yrMaintenance labor cost $17,000 $/yr

Material and supply cost $8,750 $/yrEnergy cost $1,220 $/yrAmortization cost $79,200 $/yrWaste Sludge PumpingDesign Information



Average daily pumping rate 0.187 MGD(US)

Total pumping capacity 0.187 MGD(US)Design capacity per pump 0.0935 MGD(US)Number of pumps 3Number of batteries 1Firm pumping capacity 0.187 MGD(US)QuantitiesOperation labor required 355 pers-hrs/yr

Maintenance labor required 281 pers-hrs/yrElectrical energy required 12600 kWh/yrVolume of earthwork required 1630 cuftArea of pump building 204 sqftCostsConstruction and equipment c $45,700 $Operational labor cost $8,870 $/yrMaintenance labor cost $5,540 $/yr

Material and supply cost $320 $/yrEnergy cost $1,260 $/yrAmortization cost $4,320 $/yr



Material (/yr) Chemical (/yr) Energy (/yr) Amortization (/yr)

$315,000 $0 $606,000 $1,680,000


$306,000 $0 $603,000 $1,440,000$9,070 $0 $2,480 $83,500

$0 $0 $0 $156,000$0 $0 $0 $0







s to increase the diffuser density.Notes.this_type_of_digestor_is_not_typically_designed_anymore.=This ty











pe of digestor is not typically designed anymore.



Layout (2)

Summary

Equipment DatabaseSept 2007,(USA Avg)

Layout Summary

Present Worth Project Operation (/yr) Maintenance (/yr)

$42,300,000 $30,500,000 $318,000 $101,000

Process Summary

Process Construction Operation (/yr) Maintenance (/yr)

Sequencing Batch Reactor $6,990,000 $195,000 $101,000Blower System $2,450,000 $0 $0

Other Costs $21,000,000 $122,000 $0

Summary of Costs for LayoutDescription Value Units

Other CostsQuantities

Required land 20 acreAdministration labor hours 2120 hr/yrLaboratory labor hours 3470 hr/yr

Costs



DIRECT COSTS

Mobilization $717,000 $Site preparation $952,000 $Site electrical $2,070,000 $Yard piping $1,360,000 $Instrumentation and control $1,080,000 $Lab and administration buildin $1,690,000 $Unit process construction cost $9,450,000 $

Profit $2,600,000 $Total construction costs $19,900,000 $

INDIRECT COSTSMiscellaneous cost $996,000 $Legal cost $399,000 $Engineering design fee $2,990,000 $Inspection cost $399,000 $

Contingency $1,990,000 $Technical $399,000 $Total indirect costs $7,170,000 $

MISCCost of land $400,000 $

Interest during construction $2,990,000 $

LABOR COSTSAdministration labor cost $52,900 $/yrLaboratory labor cost $69,500 $/yrUnit process operation labor c $195,000 $/yrUnit process maintenance labo$101,000 $/yrTotal labor costs $418,000 $/yr

PROJECT SUMMARYPresent worth $42,300,000 $Total project cost $30,500,000 $

Total operation labor cost $318,000 $/yrTotal maintenance labor cost $101,000 $/yrTotal material cost $110,000 $/yr

Total chemical cost $0 $/yrTotal energy cost $580,000 $/yrTotal amortization cost $896,000 $/yr

Summary of Air Supply System


Blower System for Entire PlantDesign Information

Minimum air flow capacity 36400 scfmSafety factor 1.5

Requested air flow capacity 54500 scfmTotal capacity of blowers 54500 scfmNumber of blowers in use 4Total number of blowers 5

Capacity of individual blowers 13600 scfmEstimated cost of an installed $405,000 $Blower building area 2090 sqftCostsConstruction and equipment c $2,450,000 $




NotesEnergy costs are shown at the individual unit processes that require air

Influent Wastewater(2)

Sequencing Batch Reactor

Design Output Data


Sequencing Batch ReactorDesign InformationCarbon & Nitrification DesignDesign SRT for design at wint 10 dAerated cycle time 4 hrUnaerated cycle time 2 hrSettle and decant time 1.5 hrTotal cycle time 7.5 hr

Total exchange volume require 1340000 cuftTotal volume of SBRS 836000 cuftVolume of one SBR 418000 cuftHydraulic retention time 15 hr

F/M ratio 0.237 lb BOD/lb MLSS/dCalculated SS 3520 mg/L

Calculated VSS 2640 mg/LCalculated VSS:TSS ratio 0.749 lb VSS/lb SSAmount of sludge generated 18300 lb/dNitrogen requirement for biom 19.6 mg/LPhosphorus requirement for bi 3.91 mg/LOxygen requirement to meet a 31200 lb/dAir flow required to meet avera 36300 scfmQuantities

Operation labor required 7270 pers-hrs/yrMaintenance labor required 4570 pers-hrs/yrElectrical energy required 5130000 kWh/yrVolume of earthwork required 387000 cuft

Volume of slab concrete requir 89400 cuftVolume of wall concrete requir 14800 cuftHandrail length 653 ft

Number of diffusers per train 9090Fine bubble diffuser floor cove 15.8 %Number of swing arm headers 7Required mixing power 413 HPTotal number of mixers 50Required mixing power per mix 8.26 HPDesign mixing power per mixer 5 HPMixing power for each unaerat 206 HP

CostsConstruction and equipment c $4,830,000 $

Operational labor cost $182,000 $/yrMaintenance labor cost $91,500 $/yrMaterial and supply cost $94,500 $/yrEnergy cost $513,000 $/yr

Amortization cost $486,000 $/yrNotesMinimum winter SRT not calculated, design SRT specified by userWARNING: Settled volume may be insufficient for sludge mass, consider changing exchange vRequired HP per mixer exceeds the maximum allowed of 5 HP/mixer, consider increasing num



SBR Pumping

Design InformationAverage daily pumping rate 75 MGD(US)Total pumping capacity 75 MGD(US)Design capacity per pump 25 MGD(US)Number of pumps 8Number of batteries 1Firm pumping capacity 75 MGD(US)

QuantitiesOperation labor required 541 pers-hrs/yrMaintenance labor required 457 pers-hrs/yrElectrical energy required 332000 kWh/yrVolume of earthwork required 13400 cuftArea of pump building 1680 sqftCostsConstruction and equipment c $2,170,000 $

Operational labor cost $13,500 $/yrMaintenance labor cost $9,140 $/yrMaterial and supply cost $15,200 $/yrEnergy cost $66,300 $/yr





$110,000 $0 $580,000 $896,000


$110,000 $0 $580,000 $691,000$0 $0 $0 $206,000

$0 $0 $0 $0





olumeer of mixers per tank

Date post:	06-Apr-2018
Category:	Documents
Upload:	majkakkar
View:	216 times
Download:	0 times

CDW Example Comparing Extended Air vs SBR

Documents