Iron/Manganese Package Plant · iron and manganese levels at < 0.05* mg/L and < 0.077* mg/L,...

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: rross@westech-inc.com

Wayne Dodsworth

Koester Associates, Inc.

Phone: (585) 472-1375

Email: wayned@Koesterassociates.com

Iron/Manganese Package PlantPre-Engineered Ground Water Treatment

Village of Bolivar, NY