welcome! []...the primary filtering mechanism is the schmutzdecke(biological layer) they are not...
TRANSCRIPT
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WELCOME!
This training is presented by RCAC with funding provided by the California State
Water Resources Control Board Division of Drinking Water (DDW)
The Rural Community Assistance Partnership
RCAC
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RCAC Programs
Affordable housingCommunity facilitiesWater and wastewater infrastructure
financing (Loan Fund)Classroom and online trainingOn-site technical assistance Median Household Income (MHI) surveys
Control Tabs
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Audio Controls
Attendee List
Today’s Materials
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Marking Tool
Hide/Restore Control Panel
Questions?
Text your questions and comments anytime during the session
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Performance Assessment Rating Tool (PART)
4 to 6 weeks from todayEmail w/ today’s workshop in subject line3 questions – 3 minutes maximumHow did you use the information that was
presented today?Funders are looking for positive changesHelp us continue these free workshops!
Your Moderator Today…
Michael BoydRural Development
Specialist:Environmental
Gering, NE
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Today’s Trainer
Angela HengelRural Development
Specialist II –Environmental/Tribal
San Marcos, CA
Questions?
Text your questions and comments anytime during the session
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Water Treatment Techniques
Today’s Agenda
Water sources
Regulatory requirements
Conventional water treatment
Additional treatment technologies
Resources
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Poll #1
Hydrologic Cycle
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Where is most of the water?Percentage
Oceans 97.2
Ice Caps & Glaciers2.14
Groundwater 0.61
Surface Water 0.009
Soil Moisture 0.005
Atmosphere 0.001
Aquifers As water percolates through soil it
ultimately reaches impervious rock or strata.
Eventually, all the voids in the soil become permeated with water. This saturated area is known as the saturation zone.
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Water Sources - Groundwater
Saturation Zone: All the voids in the soil are permeated with water
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Water Table: The upper surface of the zone of saturation is known as the water table
Types of Aquifers
Unconfined aquifer – the aquifer is has an impervious layer beneath it, but is unconfined. Known as water table aquifer.
Confined aquifer – the aquifer is between two impervious layers (clay or rock)
If the confined aquifer is under pressure it is known as an “Artesian Aquifer”
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Groundwater ProsGroundwater that is not under the influence of surface water is generally:
Lower in organics
Less prone to contamination
Lower in turbidity
Requires less treatment than surface water
Not subjected to surface water regulations
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Groundwater ConsGroundwater is typically:
Higher in minerals
Harder water due to minerals (Ca & Mg)
Difficult to mitigate if contaminated
May be prone to: iron and manganese, radionuclides, arsenic, hydrogen sulfide (source of “rotten egg” odors), nitrates
Sources of Contamination
Storage Tanks
Septic systems
Uncontrolled Hazardous Material disposal
Landfills
Chemical and Road Salts
Pesticide and Fertilizer use
Cows
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Groundwater Contaminant Sources
Questions?
Text your questions and comments anytime during the session
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Water Sources – Surface Water
Water Quality – Surface Water
Falls under the SWTR
Higher in organics
Higher in turbidity
Softer water
Microbial contamination
Easier to pollute
Easier to contaminate
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The Multiple Barrier Approach
The Multiple Barrier Approach
Risk Prevention - assessing and protecting drinking water sources
Risk Management – using effective treatment, properly designed and constructed facilities, certified operators
Monitoring and Compliance – detecting and fixing problems in the distribution system
Individual Action - Making information available to the public on the quality of their drinking water
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Surface Water Treatment Rule
California Code of Regulations, Chapter 17, Title 22, “Surface Water Treatment”
(1) A total of 99.9 percent reduction of Giardia lamblia cysts through filtration and disinfection;
(2) A total of 99.99 percent reduction of viruses through filtration and disinfection; and
(3) A total of 99 percent removal of Cryptosporidium through filtration.
Surface Water Treatment Rule
REDUCTION is achieved by Multi-Barrier Treatment: a series of water treatment processes that provide for both removal and inactivation of waterborne pathogens
Removal = Filtration
Inactivation = Disinfection
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Surface Water Treatment Rule
Removal
A set amount of “credit” (towards reduction) will be obtained depending on which kind of filtration a plant utilizes. “Approved” Filtration:
Filtration Giardia Credit Virus Credit
Conventional 2.5 2
Direct 2 1
Diatomaceous Earth
2 1
Slow Sand 2 1
Alternative Filtration Technology
§64653. Filtration.
(e) An alternative to the filtration technologies specified in subsection (a) may be used provided that the supplier demonstrates to the State Board that the alternative technology:
(1)Provides a minimum of 99 percent Giardia lamblia cyst removal, 90 percent virus removal for the suppliers serving more than 500 persons, and 99 percent Cryptosporidium removal; and
(2) Meets the turbidity performance standards established by the State Board
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Surface Water Treatment Rule
Inactivation
All approved surface water utilized by a supplier shall be provided with continuous disinfection treatment sufficient to insure that the total treatment process provides inactivation of Giardia lamblia cysts and viruses, in conjunction with the removals obtained through filtration
CT = Residual disinfectant concentration x contact time
Quick Quiz 1
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Conventional Water Treatment
Conventional water treatment consists of four processes:
1. Coagulation
2. Flocculation
3. Sedimentation
4. Filtration
Conventional Vs. Direct
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Coagulation – Flash Mix
Coagulation – the water treatment process that causes very small suspended particles (turbidity) to attract one another and form larger particles called floc
Coagulation process – breaks down the negative charge and allows particles to come together, a.k.a. destabilization
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Most colloidal particles in water are surrounded by negative electrical charges
Negatively charged particles repel each other like negative poles of magnets
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Coagulants neutralize the negatively charged particles
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Coagulation - Dosage
Dosage is determined by the jar test
Multiple liter jars filled with raw water
Placed on mixer to imitate flash mix
Coagulant added in milligrams (mg)
Water and coagulants mixed
Mixer turned off, observe settleability
Best dosage in mg/L, apply to system
Process Control – Jar Testing
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Quick Quiz 2
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Flocculation
Flocculation – the process of gently mixing in order to enhance collision of floc particles while not breaking them apart, a.k.a. agglomeration. The action takes place in flocculation basins
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Horizontal Flocculator
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Quick Quiz 3
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Sedimentation
Sedimentation – solids removal by gravity, a.k.a. clarification.
Treatment plants that include coagulation, flocculation, sedimentation and filtration are known as Conventional Treatment Plants.
Treatment plants without sedimentation are known as direct filtration plants.
Sedimentation
Sedimentation process – sedimentation allows for a decreased velocity of flow which lessens the ability of the water to hold particles in suspension. It allows the force of gravity to overcome the force of velocity. Sedimentation takes place in a sedimentation basin
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Sedimentation
Conventional Rectangular basins –designed to provide uniform horizontal low velocity flow, a.k.a. rectilinear flow or plug flow.
Circular basins - Center feed basins, peripheral feed basins, and spiral flow
BaffleEffluent LaunderInfluent
Zone
Settling Zone
Effluent Zone
Sludge Zone
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Upflow Clarifier
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Questions?
Text your questions and comments anytime during the session
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Filtration
Filtration – the removal of suspended material by passing the material through a porous medium. Filtration removes turbidity. Turbidity can shield pathogens from disinfection.
Filtration
Filtration process– the most importation action that occurs within a filter is adsorption.
The filter media has a large surface area. As water passes through the filter bed, the suspended particles contact and adsorb (stick) onto the surface of the individual media grains or onto previously deposited material.
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Filtration Basics
Slow Sand Filtration
Slow Sand – a layer of fine sand about 3.5 feet atop about 1 foot gravel
The primary filtering mechanism is the Schmutzdecke (biological layer)
They are not used with coagulants
Flow rate is only 0.05 gpm/ft2
These filters are not backwashed, instead the top 1 inch is scraped off
It may take days for the schmutzdecke to re-form
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Slow Sand Filter
Slow Sand Filter
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Rapid Sand Filter
Capable of 2 gpm/ft2 filter rate of flow.
Utilizes coarser sand than slow sand filters
Is used with coagulants
Use of coagulants allows for a much smaller footprint
Rapid Sand Filters
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Dual Media, High Rate Filter – Utilizes 2 types of filter media, typically:
Anthracite – lighter, stays on top
Sand – more dense, stays below anthracite
Gravel – supports the filter media
Typical High Rate, Dual Media Filter
Typical High Rate, Multi-Media Filter
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Filtration
Sand, anthracite, granular activated carbon, and garnet are all examples of filter media.
SAND
GARNETANTHRACITE
Quick Quiz 4
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Diatomaceous Earth Filtration
Diatomaceous Earth is the fossilized skeletal remains of single celled aquatic plants called diatoms
As they form, diatoms produce a porous exoskeleton
When the diatom dies, the exoskeleton remains behind
There are diatomaceous earth deposits in several sites in the western U.S.
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Diatomaceous Earth Filtration
Operation of a DE filter:
1. Precoat of DE is fed to filter element (septum)
2. During filtration, a body feed of DE is fed to filter
3. Backwash takes place when a predetermined pressure loss across the filter is reached
Alternative Filtration Technology
§64653. Filtration.
(e) An alternative to the filtration technologies specified in subsection (a) may be used provided that the supplier demonstrates to the State Board that the alternative technology:
(1)Provides a minimum of 99 percent Giardia lamblia cyst removal, 90 percent virus removal for the suppliers serving more than 500 persons, and 99 percent Cryptosporidium removal; and
(2) Meets the turbidity performance standards established by the State Board
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Description of membrane process
Water forced through a porous membrane under pressure while larger molecules are held back
Microfiltration
Ultrafiltration
Nanofiltration
Reverse Osmosis
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Hollow fiber membranes
RO Filter Pore Water Molecule Dissolved Metals
Viruses
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Protozoa
Bacteria
Questions?
Text your questions and comments anytime during the session
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Disinfection Introduction
Disinfection, also known as inactivation, is a water treatment process designed to destroy or inactivate pathogenic organisms
Remember, multi barrier treatment calls for removal & inactivation
DisinfectionFiltration
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Pathogenic Organisms
Pathogenic organisms are disease causing organisms and include:
Bacteria
Viruses
Protozoa
Pathogenic Organisms
What is the primary health risk associated with pathogenic drinking water organisms?
Gastrointestinal illness
Vomiting
Diarrhea
Maybe no symptoms
Most at risk: infants, elderly, people with compromised immune systems
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Primary and Secondary Disinfection
Primary disinfection achieves the desired level of inactivation of disease causing organisms
Secondary disinfection provides a residual in the finished water
Disinfection - Physical
Disinfection can be achieved using physical and chemical methods:
Examples of Physical methods include:
Heat
Ultra Violet Radiation (UV)
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U-V Tube
U-V Unit
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Quick Quiz 5
Disinfection - Chemical
Chemical Disinfectants include:
Chlorine
Chloramine
Ozone
Chlorine Dioxide
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Choice of Disinfectant
All disinfectants have advantages and limitations
There are numerous factors involved in deciding on a disinfectant
Disinfectants may have other purposes
Chlorine is the most common disinfectant used in the US
Chlorine for Disinfection:
Readily Available
Inactivates pathogenic organisms
Relatively Inexpensive
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Chlorine for Disinfection:
Leaves a lasting residual
Long history of use in the United States
Chlorine for Disinfection:
Chlorine can be used as both a primary and a secondary disinfectant
Primary disinfection achieves the desired level of inactivation of disease causing organisms
Secondary disinfection provides a residual in the finished water
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Dosage and Residual
The amount of chlorine applied to the water is called the dosage
typically expressed in mg/L (or ppm)
Chlorine residual is the measurement of chlorine concentration in the water after treatment
expressed in mg/L (or ppm)
Chlorine Dosage
Demand – the amount of chlorine required to reach breakpoint
Residual – the desired chlorine concentration in the finished water
Demand + Residual = Dosage
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Chlorine Dosage
Demand 2 mg/L
+ Desired residual 1 mg/L
Dosage 3 mg/L
Types of Chlorine Residual
Two types of chlorine residual
Free chlorine residual
Combined chlorine residual
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Types of Chlorine ResidualCombined Chlorine
When free chlorine reacts with nitrogen compounds, chloramines are formed
Ammonia is added to water containing free chlorine to form chloramines
This process is called chloramination
The resulting residuals are known as combined residuals
Types of Chlorine ResidualCombined Chlorine
The three chloramines are:
Trichloramine,
Dichloramine
Monochloramine
Of the three, monochloramines are preferred
Formation of chloramines is controlled by adjusting the chlorine and ammonia ratios
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Types of Chlorine ResidualCombined Chlorine
The decision to use chloramines depends on each water system’s needs
In general, chloramines:
Are weaker disinfectants than free chlorine
May require higher concentration and longer contact times
Types of Chlorine ResidualCombined Chlorine
In general, chloramines:
Provide a longer lasting residual than free chlorine
Create fewer harmful disinfection by-products than free chlorine
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Types of Chlorine ResidualTotal Chlorine
Together, free chlorine residual plus combined chlorine residual is known as the total chlorine residual
Free Chlorine + Combined Chlorine = Total Chlorine
Chlorine Dioxide CIO2
Must be generated on site (unstable) combining sodium chlorite (liquid or powder) and chlorine solutions at low pH
Greenish yellow gas, odorous
Powerful oxidant
Developed to aid in taste and odor issues
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Chlorine Dioxide CIO2 - Pros
Lack of TTHM formation
Effective killing bacteria and viruses
Does not combine with ammonia
Oxidizes iron and manganese
Removes color
Taste and odor control
Somewhat effective against cryptosporidium
Does not create carcinogens
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Chlorine Dioxide CIO2 - Cons
Can create chlorates and chlorites
Gives water distinct taste, undesirable to some
Higher level operator needed
Cat urine odor
Ozone (O3)
Bluish, toxic gas with pungent odor
Ozone generated by passing a high voltage between two electrodes allowing the O2 to split, reattach and become O3
Oxygen must be dry, and particle free
Very effective disinfectant, powerful oxidizer
Must be generated on site, not transportable
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Ozone (O3) - Pros
Very powerful disinfectant, not proven to be carcinogenic (if no bromide exists)
Also effective for color, taste and odor
Less likely to create disinfection by products, assuming no bromide (creates Bromate)
Improves coagulation process, which lowers chemical cost, reduces sludge disposal and lengthens filter runs
Ozone (O3) - Cons
Equipment is expensive
High electrical costs
Residual does not last
Need to add disinfectant with residual afterwards
Large foot print
Higher level operator needed
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Questions?
Text your questions and comments anytime during the session
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Water Quality - Nitrate & Nitrite
Primary Drinking Water Standard
Health Concern
Blue Baby Syndrome- Methemoglobinemia
Nitrates (NO3)
Sources
Fertilizers
Human and Animal Waste
Atmospheric Deposition
Treatment – The BAT is ion exchange, coupled with reverse osmosis
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Water Quality - Hardness
Hardness reported as mg/L as CaCO3 (calcium carbonate)
Hardness Classification:
Soft: 0 to 17 mg CaCO3/L
Slightly Hard: 17 to 60 mg/L;
Moderately Hard 60 to 120 mg/L
Hard 120 to 180 mg/L
Very Hard > 180 mg/L
Hard Water Treatment
Ion Exchange
Media (zeolites) exchange sodium ions for hardness ions
Chemical Precipitation
pH adjustment causes soluble hardness ions to precipitate
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Operation Of Ion Exchange Unit
Softening – Hard water is fed through the unit until unit can no longer soften water
Backwash – Treated water flowed in opposite direction to remove foreign material, loosen resins and mix resins
Regeneration cycle – 10% salt brine passed through filter resins for 20-30 minutes, sodium ions exchange for calcium and magnesium ions
Rinse cycle – Rinses out unused salt
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Ion Exchange
Pros:
Lower initial costs
Smaller space requirements
Automatic controls, minimal staff
The only chemical used in this process is salt (Na), safe and easy to handle
Ion Exchange
Cons:
Increased sodium content in finished water
Disposal of regeneration waste
More expensive to operate than chemical precipitation
Not practical for surface water, due to turbidity and algae fowling media
Removes all hardness, creating corrosive water
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Ion Exchange additional uses
Used to remove inorganic constituents that cannot be removed by filtration/sedimentation
It can also be used to remove arsenic, chromium, excess fluoride, nitrates, radium, and uranium
Water Softening – Chemical Precipitation
Addition of chemicals that raise pH well above neutral
Calcium and magnesium become less soluble as pH rises
Hardness causing ions converted from soluble to insoluble
Insoluble precipitates allowed to settle out and/or to be filtered out
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Water Softening – Chemical Precipitation
Pros –
Also can remove iron and manganese
Reduction of total solids
Inactivate bacteria/viruses due to high pH
Removal of excess fluoride
Water Softening – Chemical Precipitation
Cons–
Finished water may have very high pH –11 or more, and requires pH adjustment
May produce large amounts of lime sludge
Extra facilities required
Softening chemicals are very caustic (strong base)
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Taste And Odor Control
Treatment:
Coagulation, flocculation, sedimentation
Aeration, with volatile gasses and organic compounds only
Air stripping (air diffusers)
Chlorine, chlorine dioxide, potassium permanganate, ozone
PAC (powdered activated carbon) or GAC (granular activated carbon)
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Questions?
Text your questions and comments anytime during the session
Resources
California Drinking Water Regulations http://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/lawbook/dwregulations-2014-07-01.pdf
Water Board web site
http://www.waterboards.ca.gov/drinking_water/programs/index.shtml