iron/manganese package plant · iron and manganese levels at < 0.05* mg/l and < 0.077* mg/l,...
TRANSCRIPT
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Iron/Manganese Package PlantPre-Engineered Ground Water Treatment
Village of Bolivar, NY
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Fe/Mn Removal/Village of Bolivar, NYPresentation Outline
▪ Fe/Mn Overview
▪ Treatment Options
▪ Village of Bolivar▪ Challenge
▪ Package Plant basics
▪ Existing System Data
▪ Other units in NYS
▪ Summary
▪ Questions
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Current Regulations for Municipal
• US EPA Current Effluent Guidelines
– Fe 0.3 mg/l
– Mn 0.05 mg/l
• WHO Current Effluent Guidelines
– Fe 0.3 mg/l
– Mn 0.10 mg/l
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Four Methods for Fe/Mn Removal
• Method A
– Pressure aeration/Filtration
• Method B
– Chemical oxidation/Filtration
• Method C
– Aeration/Detention/Filtration
• Method D
– Aeration/Solids Contact Reactor Clarifier/Filtration
• Media Selection for the proper process is key
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Method A
• Excellent for small systems with Fe
• Fe only up to 5 ppm
• Typ. Flows up to 3 MGD (480 m3/hr)
• Pressure system - 30 psi min.
• Provide air release system
• No down turns in front face pipe
• Pilot study recommended
Pressure Filters
Pressure AeratorCompressorWell
Typical Method APlant Layout
Hometown
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Method B
• Excellent for small systems with Fe & Mn
• Fe & Mn removal
– Fe + Mn up to 5 ppm
• Typ. Flows up to 3 MGD (480 m3/hr)
• Oxidants
– Fed at well head
– Cl
– KMnO4
Typical Method BPlant Layout
Chemical Oxidants
Well
Horizontal Pressure Filter
Hometown
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Method C
• Typical flows up to 5 MGD (795 m3/hr)
• Fe & Mn up to 7 ppm total
• Detention tank
– 30 minutes minimum
– Flexible
• Size for settling Fe/Mn (2 - 3 hours detention)
• Gravity or pressure filters
Typical Method CPlant Layout
Aerator
Well
Chemical Oxidants
DetentionTank
Filters Clearwell
Hometown
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Method D
• Typ. Applied on large flows > 3 MGD
• High Fe/ Mn
• Solids Contact Reactor Clarifier
– Hydraulic loading - 1 gpm/sf (2.4 m/hr)
– Typically 1 to 2 hours detention
– Feed oxidants inside SCR
• Gravity filters
Aerator
Solids Contact Clarifier Gravity Filters
Typical Method DPlant Layout
Hometown
Well
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Filter Media
• Proper Media Selection is also key
• Proper media provides:
– Effective effluent quality
– Effective filter run lengths
• Fe removal media
– Granular media
• Mn removal media
– Mn oxide coated media
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Typical Fe Removal Media
• Sand media– Depth 24”
– Size - 0.45 - 0.55 mm
– Fe < 3 ppm
• Anthracite– Depth 24”
– Size - 0.6-0.8 mm
– Fe < 4 ppm
• Dual media– 12” sand, 0.45-0.55 mm
– 18” of anthracite
• 0.8 - 1.0 mm or
• 1.0-1.2 mm
– Fe < 7 ppm
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Filter Medias
• Greensand Plus
• Manganese Anthra/Sand
• Pyrolucite
• Engineered oxide and/or ceramic materials coated with MnO2
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Village of Bolivar, NYCase Study
▪ Village of Bolivar▪ Challenge/Solution
▪ Package Plant basics
▪ Existing System Data
▪ Other units in NYS
▪ Summary
▪ Questions
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Village of Bolivar, NYChallenge
• Village of Bolivar, NY, struggled with maintenance of its two water supply systems
• Three (3) groundwater sources
• Treated water is combined with treated water from nearby Town or Richburg
• Provides water to ~1650 customers, local school being largest customers
▪ Iron 0.59 mg/ l and Manganese 0.75 mg/l, both above SMCL
▪ Existing process used only chlorine
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Village of Bolivar, NYSolution
▪ Project funded by NY State Revolving Fund and some Federal Funding to build a new WTP
▪ Hired Clark-Patterson Lee of Olean, NY to design the plant
▪ Treatment process to provide Aeration, Detention, & Filtration processes into a compact footprint
▪ Selected Westech Engineering Packaged Iron/Manganese Removal System
▪ 12 foot diameter Aeralater Type II unit
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Aeration
Detention
Filtration
Village of Bolivar, NYProcess Stages
▪ Aeration▪ 20-25 gpm/ft2 loading.▪ Oxidation – 10 PVC Slats Rows
on 2” Centers▪ Detention
▪ 30 minutes.▪ Filtration
▪ 2.5-3.0 gpm/ft2 loading rate▪ 3-4 cells per unit (Bolivar 4)▪ Media retention or gravel
support▪ Water only backwash or
Simultaneous air and water (Bolivar is water wash only)
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Village of Bolivar, NYAnatomy
Inlet Float Valve
Multiple Cell Filter
Static Mixer for Chemical Feed
Media Retaining Trough
Common Underdrain
Face iping/Valves
Optional Air Wash Valves
Hinged Access Door
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Village of Bolivar, NYFilter OperationIn-Service Mode:
▪ Raw water enters the unit and passes control valve to aerator section.
▪ Gravity flows into aerator distribution tray, cascading down through internal media where air and water mix to oxidize iron and remove dissolved gasses/volatile compounds.
▪ Down to detention section, where chemicals are added to condition the water to form precipitate for removal by the filter.
▪ Exit the detention section and enters each filter cell using the face piping
▪ Water passes down through the filter media and into the common underdrain.
▪ The treated filter effluent exits the unit and it transferred to a clearwell or down-stream process, eventually to storage.
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Village of Bolivar, NYBackwash Operation
Water Backwash Mode▪ Switch on control panel to “backwash”
▪ Locks in well pump▪ Locks out service pump
▪ Detention section level provides backwash head▪ Backwash supply from in-service cells▪ Close inlet of cell being washed▪ Open backwash waste ▪ Rates dependent on media selection▪ Rotate to next cell, all cells washed during a
backwash event▪ Rotate the starting cell on the next backwash
event
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Village of Bolivar, NYBackwashing
• This plant conducts backwashes manually.
• Done about once every 10 days, which has proven effective, through the months of operation.
• Plant runs about 10 hours per day
• Estimates about 70-100 hours run time on the filters
• Backwash waste is sent to a pit then sent to local wastewater treatment plant.
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Village of Bolivar, NYSystem Details
▪ 12 ft. diameter▪ Design capacity of 286-340 gpm▪ Painted steel construction for
detention, filtration, & face piping; aluminum aerator.
▪ Four cell filter section with treated sand media for manganese reduction
▪ Water only backwash process▪ Butterfly valves with manual
actuators▪ Automatic controls to monitor filter
headloss.▪ Chemical feed equipment:
Peristaltic pumps UPDATE▪ Liquid Potassium Permanganate
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Village of Bolivar, NYSystem Details
System Features
▪ Aerator allows water to drain freely to detention tank, minimizes chances of freezing.
▪ Therefore, only the blower is located outside the building above the roof line.
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Village of Bolivar, NYSystem Details
System Features▪ The aeration section utilizes PVC
pipes for the internal media.
▪ Placed in alternating configuration on 2 in vertical centers, this allows for effective oxygen transfer for the oxidation of the iron.
▪ Design minimizes the depositing of iron precipitant on the media that can cause issues of fouling, clogging, and reduced treatment performance.
▪ The aerator is designed with an access door to allow periodic cleaning.
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Village of Bolivar, NY System Details
System Features▪ Manways are located internally
for access to the four filter cells.
▪ These manways allow access to the various sections of the treatment unit to completed inspections and periodic maintenance.
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Village of Bolivar, NYSystem Details
System Features▪ Package Plant incorporates
butterfly valves with manual actuators.
▪ Operator opens/closes valves for the required operation function of standard filtration mode & filter backwash.
▪ Operation of the unit simple.
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Village of Bolivar, NYSystem Details
▪ The filter design incorporates a flat plate underdrain with media retaining nozzles, eliminating the need for a gravel support layer.
▪ The filter media configuration is 24 in of mono sand coated in situ media for manganese reduction.
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Village of Bolivar, NYFilter Media
▪ The media is a conditioned filter media that applies a coating on the granular media.
▪ This coating aids in the treatment of iron and manganese.
▪ Along with the continual chemical oxidant being dosed to the treatment system, this maintains a well establish coating on the filter media and provides good treatment performance.
▪ Does not require regeneration or recharging.
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Village of Bolivar, NYPerformance
▪ Influent concentrations are above the US EPA secondary drinking water quality guidelines of 0.30 mg/L for iron and 0.05 mg/L for manganese.
▪ The effluent water quality from this plant is measuring the iron and manganese levels at < 0.05* mg/L and < 0.077* mg/L, respectively.
*Finished water is blended with Richburg water.
▪ The Iron/Manganese Packaged Treatment process is producing a high quality effluent water quality with levels below the drinking water standards for iron and manganese.
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Iron/Manganese Package PlantOther NY Installations
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Village of Bolivar, NYSummary
▪ The Packaged Treatment system has provided good treatment for the Village of Bolivar since startup in August 2015
▪ Package configuration offers compact design with small footprint.
▪ The Village of Bolivar continues to provide the proper treatment to produce high quality drinking waters.
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Village of Bolivar, NYSummary
When asked how about the AERALATER performance, Wayne Stonemetz, the plant operator of the water treatment plant, commented,
“I love it, I really like this system, and it’s great, simple and has no problems with it. It’s a vast improvement over what used to be here.”
The previous treatment was only chlorination and anti-corrosion chemicals. Due to the simplistic configuration of the packaged treatment system and it operational demands, the unit operates in a manual mode.
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Summary
• Fe & Mn
– Stains fixtures/laundry
– cause taste/odors
– Removal is best treatment
• Current Guidelines
– USEPA
• Fe 0.3 mg/l
• Mn 0.05 mg/l
– WHO
• Fe 0.3 mg/l
• Mn 0.05 mg/l
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Summary
• Four Basic Methods
– Method A - Pressure Aeration/Filtration
– Method B - Chemical Oxidation/filtration
– Method C - Aeration/detention/filtration
– Method D - Aeration/SCR/Filtration
• Process selection is important
– To achieve good effluent and filter run times
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Summary
• Media selection is important
– To achieve good effluent and filter run times
– Mn coated media aid in removal of Mn
• Take advantage of Mother Nature
– 1 part O2 will help oxidize 8 parts of Fe.
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Village of Bolivar, NYQuestions
QUESTIONS?
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Iron/Manganese Packaged Treatment Contacts
Additional information:
Rich Ross
WesTech Engineering, Inc.
Phone (443) 255-5973
Email: [email protected]
Wayne Dodsworth
Koester Associates, Inc.
Phone: (585) 472-1375
Email: [email protected]
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Iron/Manganese Package PlantPre-Engineered Ground Water Treatment
Village of Bolivar, NY