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Iron/Manganese Package PlantPre-Engineered Ground Water Treatment
Village of Bolivar, NY
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
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
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
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
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
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
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
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
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
Filter Medias
• Greensand Plus
• Manganese Anthra/Sand
• Pyrolucite
• Engineered oxide and/or ceramic materials coated with MnO2
Village of Bolivar, NYCase Study
▪ Village of Bolivar▪ Challenge/Solution
▪ Package Plant basics
▪ Existing System Data
▪ Other units in NYS
▪ Summary
▪ Questions
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
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
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)
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
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.
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
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.
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
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.
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.
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.
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.
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.
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.
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.
Iron/Manganese Package PlantOther NY Installations
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.
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.
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
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
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.
Village of Bolivar, NYQuestions
QUESTIONS?
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]
Iron/Manganese Package PlantPre-Engineered Ground Water Treatment
Village of Bolivar, NY
