evaluating membrane filtration performance guarantees

Evaluating Membrane Filtration Performance Guarantees

Nikki Mayer Carollo Engineers

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Acknowledgements

Ron Whitlatch, P.E. (City of Lebanon)

Rob Emmons, P.E. (City of Lebanon)

Mike Trippett (City of Lebanon)

Dan Hugaboom, P.E. (Carollo)

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Discussion Outline

• Project Background

• Performance Guarantees

• Evaluation and Enforcement of Guarantees

• Proof Pilot Test Results

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City of Lebanon is in Final Design of a New WTP 4.5 MGD to Replace its 1946 Conventional WTP

• 4.5-MGD water treatment plant to replace current, aging plant

• Treat water from the South Santiam River

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Raw Water Quality and Finished Water Quality Goals

Constituent Average Raw Water Quality

Finished Water Quality Goals

Turbidity (NTU) 4.4 0.15

Total Organic Carbon (mg/L) 1.0 N/A

Disinfection By-Products

Chlorite (mg/L) -- 0.8

Total TTHM (µg/L) -- <64

HAA5 (µg/L) -- <48

Alkalinity (mg/L) 16 30 pH 7.1 7.5 Corrosivity -- Non-corrosive

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Process Selected to Achieve Treatment Objectives

Pressurized Membrane Filtration System CT Basin

HF

SAS

AC

H

SH

CS

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Membrane Filtration Reduces Turbidity to Less Than 0.15 NTU


HF

SAS

AC

H

SH

CS

Filtration

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Membrane Filtration Provides 4-Log Reduction for Giardia and Cryptosporidium


HF

SAS

AC

H

SH

CS

Disinfection

Filtration

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CT Basin Provides 0.5-Log Giardia and 4-Log Virus Inactivation


HF

SAS

AC

H

SH

CS

Disinfection Disinfection

Filtration

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MEMs Option

1

Option 2

Option 3

Initial Screening to Select the Right Polymeric MF/UF Membrane

OEMs and MEMs OEMs

Option 1

Option 2

Option 3 In

itial

Scr

eeni

ng:

Key

Proj

ect C

riter

ia

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MEMs Option

1

Option 2

Option 3

Final Polymeric MF/UF Membrane Selection

OEMs OEMs MEMs Selected

Option 1

Option 2

Option 3

Option #

Option #

Initi

al S

cree

ning

: Ke

y Pr

ojec

t Crit

eria

Fina

l Sel

ectio

n:

Eval

uate

d Bi

ds

OEMs and MEMs

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Membrane Procurement Documents

Basis of bid evaluation and design should include:

• Project Risks

• Performance Requirements

• Non-performance remedies and penalties

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Guarantees Provided by the Suppliers Are the Basis for Estimating Life-cycle costs

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Operational Costs Often Define the Success of a MF/UF Project

Capital Cost Operating Costs

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Procurement Approach

• Open Platform System − Membrane racks, chemical

cleaning and other ancillary equipment can be reconfigured for alternate membrane modules.

− Maintains flexibility and competition in future membrane module replacements.

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Procurement Approach Established Criteria for Evaluating Interchangeability and Performance Guarantees

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Performance Guarantees

Membrane System Energy Requirements Chemical Requirements

Net Production Capacity Average Power Consumption

Number of chemical cleans

Spare module slots per rack

Total Connected Load Volume of chemicals used per clean

Net Flux Rate Volume of water used per clean

Maximum Instantaneous Flux Rate Maximum

Transmembrane Pressure Minimum Membrane

System Recovery

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Evaluation of Guarantees

Proof Pilot Test

Initial Performance Test

Monitored Test Period

1

2

3

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Proof Pilot Test

• 30 to 90 day test performed after Membrane Procurement

• Objectives: − Test performance of

module − Determine pretreatment

coagulant dose and appropriate prescreening technology

1

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Guarantees Evaluated with Pilot Testing









System Recovery

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Enforcing Guarantees – Proof Pilot

• Corrective Actions for Poor Pilot Performance − Select alternative membrane for installation − Add additional membrane modules to full-scale

installation

Poor Pilot Performance

+ +

Mem

bra

ne

A

Mem

bra

ne

B

Mem

bra

ne

A

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Proof Pilot Test



1

2

3

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Initial Performance Test (IPT) 2

• 7-day test performed at the end of the construction period − Operate for 7 continuous days without a major failure − Meets all performance requirements

• Functional Test and Direct Integrity Test Validation to be performed prior to IPT

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Guarantees Evaluated With IPT









System Recovery

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Enforcing Guarantees – IPT

• Corrective Actions − MSS has option to repeat the test three times − Must provide written plan to modify, supplement or

remove and replace their system

• Penalties − If the system fails three times, Owner may require

removal and replacement of system with alternative membrane module

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Proof Pilot Test



1

2

3

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Monitored Test Period 3

• 30-day test after successful completion of IPT − Minimum duration of 4 weeks − Must end within 26 weeks

• Average Power Consumption Test Concurrent with MTP − 30-day test

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Guarantees Evaluated With MTP









System Recovery

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Guarantees – MTP

• Corrective Actions − MSS has 3 chances to restart MTP − Possible System Modifications

Addition of modules Addition of membrane filtration racks Replacement of modules with one of the alternate

modules listed in bid document

• Penalties − All costs of modification, supplementation, or

replacement

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City of Lebanon Proof Pilot Testing Results

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Pilot Testing Process

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Proof Pilot Test Evaluation Criteria

Criteria Goal Maximum TMP 29 psi Average TMP 16 psi

RC Frequency Maximum of 1 every 60 days

MC Frequency

Maximum of 1 every 3.5 days

MC Duration Less than 30 minutes

Feed Water Recovery 95%

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Membrane Module 1

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Pilot Results Criteria Pilot Results Goal

Maximum TMP 15.3 psi 29 psi

Average TMP 8.6 psi 16 psi

RC Frequency RC performed at conclusion of Pilot

Maximum of 1 every 60 days

MC Frequency Minimum time of 4 days between MCs performed


MC Duration 13 minute duration Less than 30 minutes

Feed Water Recovery 97.0% 95%

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Membrane Module 3

Membrane Module 2

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Pilot Results

Criteria Membrane Module 2

Membrane Module 3 Goal

Maximum TMP 29.3 psi 29.4 psi 29 psi

Average TMP 13 psi 14 psi 16 psi

RC Frequency 3 RCs performed 2 RCs Performed Maximum of 1 every 60 days

MC Frequency

Minimum Time of 2 days

between MCs performed

Minimum time of 3 days

between MCs performed


MC Duration 13 minute duration

13 minute duration

Less than 30 minutes

Feed Water Recovery 96.2% 96.5% 95%

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Feed Water Quality Data Must Be Evaluated and Compared to Historic Data

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Critical Water Quality Parameters Were Consistent with Historical Data

Parameter Pilot Test Historic Data

TOC (mg/L) 0.96 0.97

Temperature (C) 12.8 9.0

Turbidity (NTU) 2.2 4.1

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Conclusions

• Performance Guarantees are necessary to ensure performance of the membrane system after construction

• Guarantees are evaluated pre- and post-WTP construction to maximize potential corrective actions

• Remedies and penalties for non-performance of the Guaranteed Performance Schedule must be clearly defined and enforced

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Questions?