CA/NV AWWA Annual Fall ConferenceOctober 29, 2015

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• Most filters are run to failure – Extend Filter Asset Life

• Filters are last barrier for particulate and microbial contamination• Filter media breaks down with time

– Restore & Improve Filter Performance• Proactive program for maintenance of filters

– Media cleaning is 3-10 years– Media replacement is 10-20 years

• Ability to spread cost for initial rehabilitation • Predictable fiscal budgeting

Why Filter Asset Management

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The list is numerous and growing…◦ Primary and Secondary Drinking Water Standards Turbidity Inorganics (Arsenic, Iron, Nitrate, etc.) Organics (Coliform, Cryptosporidium, Dioxin, etc.) Emerging contaminants◦ IE&LT2SWTR Lower turbidity standards Remove microbial contamination Stricter monitoring and reporting◦ Stage 2 DBPR◦ And more to come…

– Condition assessment– Media sampling and analysis– Estimating the cost of renovations– Estimating the life expectancy– Developing a financial plan

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Components for Developing a Filter Asset Management Plan

Basics of Plant Condition Assessment

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FILTER PERFORMANCE INDICATORS SUMMARYParameter Characteristics Metrics

Filter Run TimesMono-media 24 hrs. to 72 hrs.

Dual Media or Multimedia 72 hrs. to 140 hrs.

Filtration RateOptimized

1.4 gpm/sf to4 gpm/sf

Surface filtration <1.4 gpm/sf

Filter Effluent Turbidity

Regulation <0.3 NTU 95% samples

Best practice ≤0.1 NTU

Optimized operations0.03 NTU to

0.05 NTU

• Physical Observations about filters– Media surface (mounds, cracks, craters, low

and high spots)– Mud ball diameter and appearance– Mud present on top of filters

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Plant Condition Assessment

• Observe backwash for even flow and boils– Check if the troughs are level with even flow– Check surface sweep for smooth rotation – Check backwash flow rates

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Plant Condition Assessment

• Observe the overall conditions of building– Paint, electrical, lighting, HVAC, flooring, I&C, concrete, windows,

doors– Clean filters do not help if the ceiling is falling in

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Plant Condition Assessment

Filter Ceilings in “Bad” Shape

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Filter Ceiling Debris

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Filter Media Condition Assessment

Media Analysis– Strategic & representative media sampling– Lab analysis & evaluation

• Detect mudballs, odors, colors• Multiple advanced organic & inorganic tests

– Biomass via ATP & HPC, particulates, metals & mineral deposits– Confirm & quantify issues such as CaCO3, SRB’s, Giardia, etc.

• Bench-scale chemical cleaning with variety of products• Microscopic high-resolution pictures to document physical condition• Sieve analysis to measure ES & UC of each unique media for comparison to your design

specifications

– Lab Report with Customized Recommendations (clean or replace)• No “over cleaning” or premature replacement• Presented and discussed with your staff

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Before After

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Before After

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Before After

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Before After

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Filter Cleaning

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Chemical Cleaning– Custom-blend for each filter sampled– Only NSF-approved products– Chemical injection & agitation followed by

backwashing (multiple applications if needed)

– BW monitoring (pH & turbidity)– BW neutralization before disposal if

required– Disinfect media, and entire filter system and

piping

New media and materials match plant specifications Only NSF-approved products by AWWA guidelines Turnkey service◦ Remove and dispose old media & gravel◦ Full underdrain cleaning and inspection◦ Wall inspection and repair and/or repaint surfaces◦ Underdrain repairs and replacement◦ Filter System upgrades (e.g. media, equip.) Engineering & permitting as needed◦ Order & install new media & gravel◦ Bring online & assist with disinfection and Bac-T samples

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Water Treatment PlantFilter Condition Assessment

Summary Report

Table of Contents Purpose ......................................................................................................................................................... 1

Executive Summary ...................................................................................................................................... 2

Condition Assessment Activities .................................................................................................................. 3

Condition Assessment Findings ................................................................................................................... 5

Filter 1 ....................................................................................................................................................... 7

Filter 2 ....................................................................................................................................................... 9

Filter 3 ..................................................................................................................................................... 11

Filter 4 ..................................................................................................................................................... 13

Filter 5 ..................................................................................................................................................... 15

Filter 6 ..................................................................................................................................................... 17

Condition Assessment Conclusion ............................................................................................................. 19

Condition Assessment Recommendations ................................................................................................ 20

Preliminary Scope of Work and Price Estimate ......................................................................................... 24

Exhibit 1 ....................................................................................................................................................... 28

• Initial Condition Assessment of your granular filtration system

• Schedule filter rehab and maintenance work over the chosen MP period

• Annual Condition Assessments throughout MP• Asset Management tool spreads and predicts cost

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Developing a Financial Plan

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• Upfront Renovations– Filter Components– Plant Components– Media Cleaning/Replacement

• Ongoing Maintenance– Pumps– Controls– Media Cleaning/Replacement

Spread the Cost or Lump Sum

Operation under Run to Failureor

Proactive Maintenance Program

Filter Maintenance Program – Benefits

• Restores and Improve Filter Performance• Extend Filter Asset Life• Responsible Asset Management through Condition Assessments• Rehabilitation to owners needs/wants/desires• Build future cost model for financial needs• Provides predictable fiscal budgeting

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Questions?

Contact Info:Dawn Halpern

Water System Specialist Utility Service Group

619-818-3840dhalpern@utilityservice.com

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