WATEREUSE LA CHAPTER MEETING - 14 April 2015 WRRF Project 13-12: - - PowerPoint PPT Presentation

WATEREUSE LA CHAPTER MEETING - WRRF Project 13-12: Evaluation of Source Water Control Options and the Impact of Selected Strategies on DPR

14 April 2015

WATEREUSE RESEARCH FOUNDATION (WRRF) PROJECT 13-12

• Funded by CA Direct Potable Reuse

(DPR) Initiative

• WRRF Project 13-12 Project

Objectives:

• Evaluate upstream wastewater

treatment impacts on DPR source water and downstream advanced treatment processes

• Assess the impact of hydraulic

control mechanisms on influent water quality and flow variations that may stress advanced treatment process for DPR applications

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CASE STUDIES FOR WRRF PROJECT 13-12

• Case Study 1 = Orange County Sanitation District

(OCSD) and Orange County Water District (OCWD)

• Case Study 2 = City of Los Angeles Bureau of

Sanitation and West Basin Municipal Water District

• Case Study 3 = City of San Diego
• Case Study 4 = Singapore Public Utilities Board

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CASE STUDY 1: ORANGE COUNTY SANITATION DISTRICT (OCSD) AND ORANGE COUNTY WATER DISTRICT (OCWD)

• Source water for OCWD’s

AWPF = 75:25 of activated sludge to trickling filter effluent

• No flow equalization

currently available, thus treatment performance impacted by diurnal flow variations

• Minimal contribution

from plant return streams in AWPF source water

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CASE STUDY 2: CITY OF LOS ANGELES BUREAU OF SANITATION AND WEST BASIN MUNICIPAL WATER DISTRICT

• Source water for West

Basin’s AWPF = secondary effluent from high purity activated sludge process

• Secondary effluent

quality impacted by plant return streams

• Constant secondary

effluent flow to West Basin’s AWPF

West Basin ECLWRF Hyperion Treatment Plant

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CASE STUDY 3: CITY OF SAN DIEGO

• Source water for AWPF =

tertiary effluent

• Fully nitrified/ denitrified

secondary effluent

• Primary flow equalization

provided at WWTP

• No plant return flows

within WWTP (scalping plant)

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CASE STUDY 4: SINGAPORE PUBLIC UTILITIES BOARD

• Source water for

AWPF = secondary effluent from MBR

• Fully nitrified/

denitrified secondary effluent

• Secondary effluent

flow equalization provided at WWTP

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Aerial view of OCSD Plant 1 and OCWD GWRS Facility

N

Trickling Filter Facility (P1-76) = 30 MGD Secondary Activated Sludge Facility 1 (P1-82) 75 MGD Secondary Activated Sludge Facility 2 (P1-102) 60 MGD

OCSD Plant 1 Secondary Treatment Facilities

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SOURCE WATER FOR OCWD’S AWPF

• Quality: 5 NTU Monthly /

10 NTU Instantaneous

• Diurnal Flow Variations
• Blend of 25% Trickling Filter

(TF) Effluent to 75% Nitrified Activated Sludge Effluent (P1-102)

• TF Effluent = non-nitrified,

ammonia used for chloramine formation

• Lower cost treatment with TF

than Activated Sludge

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2 4 6 8 10 12 14

MF Daily Average TMP (Psi) Date

MF Train B05

TF Effluent + CBOD Removal Only NdN Mode P1-102 NdN Online

IMPACT OF SECONDARY EFFLUENT QUALITY ON MF PRETREATMENT AT AWPF

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• 2

2 4 6 8 10 12 14

MF Daily Average TMP (Psi) Date

MF Train B05 MF Train A01 MF Train D08

SIMILAR TREND AMONGST ALL MF TRAINS

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5 10 15 20 25 30 10 20 30 40 50 60

Turbidity (NTU) % of Trickling Effluent in OCWD FeeD Flow Date

TF % MF Feed Turbidity

IMPACT OF TF CONTRIBUTION ON “SOURCE” WATER QUALITY FOR AWPF

NdN Mode P1-102 NdN Online TF Effluent + CBOD Removal Only

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5 10 15 20 25 30 35 40 10 20 30 40 50 60

Daily Average RO ∆P (Psi) %TF Contribudtion to Total Feed Flow to OCWD GWRS Date

TF% RO C01 Stage 1 DP RO E03 1st Stage DP

IMPACT OF TF CONTRIBUTION ON RO SYSTEM

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ON-GOING RESEARCH WORK FOR WRRF 13-12

• Quantify performance of other AWPFs with

different “source” water qualities (e.g. tertiary effluent, high-purity oxygen AS secondary effluent, and MBR effluent)

• Review source control/industrial pretreatment

programs of each utility partner

• Compare primary vs secondary effluent flow EQ and

its impact on AWPF treatment performance

• Site visit to complete case studies

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