Post on 09-May-2018
transcript
Chemical Cleaning of Water
Filter Media
WaterMix
Pete Wiederhold
Bob Mattey
Utility Service Company Inc.
What is WaterMix?What is WaterMix?
WaterMix is a comprehensive patent WaterMix is a comprehensive patent
pending process for potable water pending process for potable water
systems that combines unique systems that combines unique
technologies with professional services technologies with professional services
that that result in cleaner waterresult in cleaner water
WaterMix ObjectiveWaterMix Objective
Provide those responsible for potable water Provide those responsible for potable water systems with a new set of tools to manage water systems with a new set of tools to manage water
quality and assetsquality and assets
•• Maximize water plant efficiencyMaximize water plant efficiency
•• Remove organics & the precursors to DBPRemove organics & the precursors to DBP’’ss
•• Eliminate stratification; minimize nitrificationEliminate stratification; minimize nitrification
•• GASB 34 asset managementGASB 34 asset management
•• Reduce riskReduce risk
Water Treatment Plant
Clearwell
Treatment
BasinClarifier Filter
Distribution
Tank
Distribution Line
���� Home WaterMix is a Comprehensive ProgramWaterMix is a Comprehensive Program
• Patented cleaning of
- filter media
- vessels/walls/troughs
- air strippers
- aerators
• Patented bio film removal
• Patented active mixing
(24/7/365 elimination of temp.
stratification)
• Tank asset management
Water Treatment Plant
Clearwell
Treatment
Basin Clarifier Filter
Distribution Tank
(all types)
Distribution Line
���� Home WaterMix is a Comprehensive ProgramChlorine Demand and DBP Formation; Cleaning of Vessels
WaterMix is a Comprehensive ProgramChlorine Demand and DBP Formation; Cleaning of Vessels
ppm
DBP’s
Residual Chlorine
� There cannot be a “weak link” in the system or the approach to managing water quality
�� There cannot be a There cannot be a ““weak linkweak link”” in the system or the in the system or the approach to managing water qualityapproach to managing water quality
time
Once formed, there’s no way to reduce DBP’s or
nitrification (chloramine systems).
Once formed, there’s no way to reduce DBP’s or
nitrification (chloramine systems).
The WaterMix ProgramComprehensive Mix of Professional Services
The WaterMix ProgramComprehensive Mix of Professional Services
•• Integrated program for managing water quality and Integrated program for managing water quality and
the distribution tank (physical asset)the distribution tank (physical asset)
–– Water PlantWater Plant
•• Regular cleaning of filters, media, aerators, air Regular cleaning of filters, media, aerators, air
strippers, clearwellsstrippers, clearwells
–– Distribution TanksDistribution Tanks
•• Regular cleaningRegular cleaning
–– sediment and biofilm removalsediment and biofilm removal
•• NSF 61 Active Mixing system (24/7/365)NSF 61 Active Mixing system (24/7/365)
•• InspectionsInspections
•• Maintenance of coatings, structural, sanitary, safety, Maintenance of coatings, structural, sanitary, safety,
security conditionssecurity conditions
•• Provided in a comprehensive maintenance programProvided in a comprehensive maintenance program
The Impact of Fouled Filter Media on
Water Plant Operations
The Impact of Fouled Filter Media on
Water Plant Operations
Fouled
Media
• Growth in media
volume leads to media
losses during
backwash
• Encapsulation of
media leads to
increased pores
(channeling);
decreased filter
efficiency
• Density differences
that keep media
separated are reduced
causing media to mix
and lose efficiency
• Increased
frequency of
backwashes
• reduced plant
capacity
• Increased
disinfectant
demand
• Increased DBP’s
• Poorer water
quality
• Media losses
during backwash
Water Plant: Details of ServiceWater Quality Management
Water Plant: Details of ServiceWater Quality Management
•• NSF 60 certifiedNSF 60 certified
•• OffOff--line, online, on--site applicationsite application
–– Typically requires only 24 hoursTypically requires only 24 hours
•• Removes mineral and organic deposits, Removes mineral and organic deposits,
lime scale and biofilm from filter media, lime scale and biofilm from filter media,
vessel walls, under drains, and troughs vessel walls, under drains, and troughs
inin
–– Gravity filters, pressure filters and Gravity filters, pressure filters and
softenerssofteners
•• Cleans air stripping towersCleans air stripping towers
•• Patented productsPatented products
Observed Filter Media Cleaning Benefits
• Reduced head loss
• Longer filter runs
• Improved Fe and Mn retention
• Reduced turbidity
• Restoration of media stratification
• Extended media lifetime
• Increased filter capacity
• Unclogging of direct-media-support type
underdrains
Water Mix Case Study
• Village of Chauncey, Ohio
• 3 pressure Filters
• 25 years filters in service.
• Village backwashed filters twice per day.
• Media loss during backwash.
• Increased Chlorine demand.
• Increased back pressure.
Case Study Cont.
• Core samples taken and lab report generated.
• Recommended two treatments per filter.
• After cleaning – backwash frequency reduced to once every 7-8 days.
• Reduced back pressure.
• Reduced chlorine usage.
• Recommended schedule of cleaning every 3 years to maintain maximum filter efficiency.
Utility Service Company Inc.
• Full service Water Storage Tank Maintenance since 1963.
• Water Filter Media testing and chemical cleaning.
• Bio-film cleaning from water storage tanks.
• Active mixing systems for water storage tanks.
• Water Tank inspection and repair services Visual , Washout, or Robotic (ROV).
Simultaneous Compliance Dilemma:
The Surface Water Treatment Rule (SWTR, 1989)
requires to maintain a detectable disinfectant residual
(free chlorine, chloramines, chlorine dioxide) throughout
the distribution system = add more chlorine.
The Disinfectant/Disinfection Byproduct Rules (D/DBP
Rules) limit disinfectant residuals and disinfection
byproducts (TTHM, HAA5) = add less chlorine.
How to ensure a sufficient chlorine residual
without exceeding DBP levels?
Stage 2 D/DBP Rule:
•Same TTHM and HAA5 limits as Stage 1, but reporting as
locational running annual average (LRAA) instead of
running annual average (RAA).
•Specifies sampling locations based on Initial Distribution
System Evaluation (IDSE)
•Enforced by USEPA, not states
•Many systems that can comply at RAA (Stage 1) reporting
will fall out of compliance at LRAA (Stage 2) reporting