Water Environment Federation and Arizona Waters Student Design

Competition

Naif Alkahtani, Ahmad Almohammedsaleh, Brittany Riser, Juris Tan, Kyle Telesco

1

Figure 1: WEF Logo [1]

Figure 2: AZ Water Logo [2]

CENE - 486CApril 16, 2021

Project Description

2

● Purpose: To design a new water treatment plant, maintain TOC level below 2.0-mg/l in the finished water

● Client: AZ Water & WEF● Location: North Water

Treatment Plant (NWTP) ● Stakeholders: AZ Water,

WEF, NAU, and the City of Gilbert

Figure 3: Project Location [3]

Objectives● Lower the TOC levels less

than 2 mg/L ● Reduce chemical usage

Constraints ● Meet water regulations from

○ Environmental Protection Agency (EPA)

○ Arizona Department of Environmental Quality (ADEQ)

○ Maricopa County Environmental Services Department (MCESD)

● Meet expected demand to treat 70MGD by 2050.

Current Layout

3

Figure 4: Existing Site Layout [4] Figure 5: Provided Source Water Characteristics [4]

* The build out population was used because of its closeness to the 2050 population** Daily Demand Factors were carried through from present WTP productions

Demand Calculations

4

Build Out Population: The maximum population for an area

Table 1: Total Production

Design production based on population estimates

Even years & even productions

Demand Calculations - Phasing

5

Table 2: Production Timeline

Lifecycle CostsCost estimation formulas

O&MCost estimation formulas

Social & Environmental FactorsAvailable literatureProcess efficiency improvements

Staffing LevelsAvailable literaturePortion of O&M from Staffing

Process Efficiency ImprovementsProcess Dependent

Feasibility/ConstructabilityComplexity of designResistance to dust storms/heatAlternative footprint

WeightingTreatment Process Dependent

6

Matrix Criteria

Preliminary Treatment

7

Screening

● Bar screen considered enough for preliminary treatment

Figure 6 : RakeFlex Bar Screen [11]

Primary Treatment - Decision Matrices

8

Table 3: Primary Clarifier Decision Matrices

Primary Treatment - Design

9

Rectangular clarifier

Dimensions of Clarifier 13.3m wide, 4.3m depth, 37.3m long

Phase 0(2021)45 MGD

1 Rectangular TankSurface area : 496m2

Phase 1 (2030)60 MGD

Adding 1 Tank (Total 2 rectangular clarifiers) Total Surface area: 992m2

Equation 1: Stokes Equation for Laminar Flow

Table 4: Rectangular Clarifier Design

Figure 7: Rectangular Clarifier [5]

Disinfection - Decision Matrices

10

Table 5: Disinfection Decision Matrices

Disinfection (Ozone) - Design

11

Table 6: Ozone Design

Figure 8: Ozonia CFV-30 Generator [6]

Figure 9: Diagram of Over-Under Contact Chamber [5]

Disinfection (UV) - Design

12

Figure 10: TrojanUV Signa Diagram [7]

Figure 11: TrojanUV Signa Photo [7]

Table 7: UV Design

Secondary Treatment - Decision Matrices

13

Table 8: Secondary Clarifier Decision Matrices

Secondary Treatment - Design

14

Figure 12: Circular Clarifier [5]

Equation 1 : Stokes Equation for Laminar Flow

Table 9 : Secondary Clarifier Design Phasing Information Table 10: Recommended Clarifier Tank Depths [5]

Filtration - Decision Matrices

15

Table 11: Filtration Decision Matrices

Filtration- Design

16

Table 12: Filtration Design

Figure 13: Veolia FiltraFlo TGV Media View [8]

Solid Treatment

17

Table 13: Solids Decision Matrices

Figure 14: Belt Filter Press Diagram [9]

18Figure 15: System Curve

Figure 16 : Centrifugal Pump [10]

Hydraulics

Table 14:Pump Information

19

20

Bar Screen OzonationSecondary

SedimentationPrimary

Sedimentation

UV/Chlorine Filtration

Solids

Final Design Summary - Plant Flow Chart

Distribution

21

Final Design Summary - Treatment PhasingTable 15: Design Summary

1 Calculating interest rate2 Initial year values3 Converted to present day money4 Grand Total

Cost Analysis - Example Calculation

22

1

2

3

4

Principal & O&M Yearly Cost(Simple interest)

O&M Total Cost(Uniform Series)

Equation 2 : Simple Interest

Equation 3 : Uniform Series

Table 16 : Example Cost Analysis Table

Cost Analysis - Totals

By Process

By Phase

23

Table 18: Cost by Process

Table 17: Cost by Phase

Impacts

24

Table 19: Impacts

25

[1] Water Environment Federation - WEF Home, “WEF Home.” [Online]. Available: https://www.wef.org/. [2] “AZ Water Association.” [Online]. Available: https://www.azwater.org/. [3] "Map of US," [Online]. Available: https://www.mapofus.org/arizona/.[4] WEF, AZ Water Student Design Competition 2021, Gilbert: WEF, 2021.[5] M. L. Davis, Water and Wastewater Engineering Design Principles and Practice, McGraw-Hill. [6] SUEZ Water Technologies and Solutions, [Online]. Available: https://www.suezwatertechnologies.com/products/disinfection-oxidation/ozonia- dome-diffuser.[7] TrojanUV Disinfection Technologies, [Online]. Available: https://www.resources.trojanuv.com/wp-content/uploads/2020/12/TrojanUVSigna-Brochure.pdf.[8] "Veolia Water Technologies," [Online]. Available: https://www.veoliawatertechnologies.com/asia/en/solutions/products/filtraflo- tgv. [9] “Belt filter press,” Binfirst, 24-Dec-2019. [Online]. Available: https://www.binfirst.com/products/belt-filter-press/. [Accessed: 09-Mar-2021]. [10] 2021.http://www.gouldspumps.com/ittgp/medialibrary/goulds/website/ Literature/Pump%20Selection%20Guide/Goulds_Rev_PSG.pdf.[11] Duperon, “The Duperon FlexRake”, Duperon Adaptive Technology, 2019, Saginaw, Missouri.

References

Questions?

26