HomeMy WebLinkAbout2023-12-18 Second odor scrubber request to Council CITY OF
TWIN FALLS Date: Monday, December 18, 2023
To: Honorable Mayor and City Council
0-1 `;.� From: Nathan Erickson, Environmental Manager
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ACTION ITEM
Request:
Request that the Council approve using wastewater reserve funds, not exceeding $140,000, to purchase a
second odor scrubber with associated components.
Time Estimate:
Staff estimates 5-10 minutes to explain history and request.
Background:
On April 3, 2023, the Council was presented with the results from the 2022 odor control study completed
by Consor Engineering. That study identified the next steps to be taken, which included purchasing a
mobile odor scrubber. The City received a mobile odor scrubber in July 2023 and began using the unit at
two different locations. On October 23, 2023, the Council was presented with the data collected during
the summer of 2023 and the positive impact the mobile odor scrubber provided on hydrogen sulfide
concentrations in the City's sewer. The results suggest a permanent odor scrubber would be beneficial
near the last manhole along the Grandview trunkline before it drops off the canyon rim to reduce odors
in the surrounding neighborhood.
Following the October 23, 2023, presentation to the council, neighbors living near the canyon rim asked
that the City conduct another trial using the mobile odor scrubber at the last manhole. In preparing to
complete this trial, it was determined that an odor scrubber is required at a location on the south side of
town for an uncertain amount of time. To accomplish a trial at Canyon Rim, a second odor scrubber will
be needed.
The mobile odor scrubber the City currently owns has a maximum airflow capacity of 650 cubic feet per
minute (CFM) and holds 1,000 Ibs of carbon media. When it was purchased, the City paid $53,908.
Purchasing another odor scrubber of the same size is expected to cost a similar amount. If a similar-sized
odor scrubber were purchased, it would be useful during the trial but may have limited use following the
trial. A more favorable option would be to buy a larger odor scrubber with two blowers that could
ultimately be used in a permanent location. One blower would be the same size as the mobile odor
scrubber (650 CFM) for a temporary application, while the larger blower would be used when the unit
was installed in a permanent location with a maximum airflow capacity of 2,000 CFM. The larger odor
scrubber would also have four times the volume of media storage, including 2,400 Ibs of carbon media
and an enhanced compartment with 1,000 Ibs of a special carbon media made of coconut shells to
provide additional air cleaning that the mobile odor scrubber does not have. The estimated cost of a
larger odor scrubber is $115,400 (see attached estimate). City staff recommends purchasing the larger
odor scrubber and using it temporarily on the south side of town to free up the mobile odor scrubber for
the trial at Canyon Rim. Once the trial is completed and a permanent location is identified, the City will
have already invested in the appropriately sized odor scrubber to be used at a permanent location.
Additional associated expenses with odor scrubbers are the carbon media, mist eliminator, and odor
loggers. The carbon media must be changed when the carbon has absorbed the allowable amount of
hydrogen sulfide and no longer absorbs hydrogen sulfide. The carbon media's life span depends on the
hydrogen sulfide concentration from the sewer. The odor scrubber is filled with media and ready to use
when purchased. It is expected that the carbon media in the second odor scrubber will last approximately
1-2 years and could last longer if spikes in hydrogen sulfide are reduced. The cost of replacing the carbon
media in the second odor scrubber is estimated at around $17,000. It is recommended that the City
purchase the replacement media to store and have on hand for when the carbon media needs to be
replaced. There is also a need to add a mist eliminator to the mobile odor scrubber to reduce the amount
of moisture that enters the carbon media (see attached estimate). Additionally, the odor loggers used in
data collection require regular calibration and replacement. It is expected that $7,600 will cover the cost
of the mist eliminator and odor loggers.
Approval Process:
Majority approval by the City Council will authorize City Staff to use wastewater reserve funds to
purchase a second odor scrubber and associated components.
Budget Impact:
Sufficient funds are available in the wastewater reserves to expend the unbudgeted amount of$140,000.
Regulatory Impact:
The odor control study allows the City to continue to better understand the causes and options available
to address the odor problems. They will also help meet Strategic Plan Objectives EC1.4.3 "The City will
continue to monitor collection systems for odors and mitigate through infrastructure improvements..."
and EC1.4.4 "The City will explore creating standards for monitoring air quality particulate saturation and
associated enforcement policies."
History:
N/A
Analysis:
N/A
Conclusion:
Based on the findings of the odor control study and the need to conduct an additional trial, the City Staff
recommends the purchase of a second odor scrubber ($115,400.00) with replacement media ($17,000)
and mist eliminator/odor loggers ($7,600.00). By doing so, staff will be able to complete a trial at the
Canyon Rim with an appropriately sized unit that can eventually be used as a permanent odor scrubber.
The total estimated expenses required for this purchase are $140,000.00, which will be requested from
the council.
Attachments:
1. Anua AiraCarb Budget Proposal Twin Falls 11.9.23
2. Anua AiraCarb Mist Eliminator 11.2.23
ILAiraCarbTM Model 2x2x2H Odor
Treatment Budgetary Proposal
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Note - Pictured air
= scrubber is 2x1x2,
the scrubber proposed
to be purchased for
the City of Twin Falls
would be double the
volume or 2x2x2.
s.t,
Treatment Stage:
AiraCarb-HC & AiraCarb-C00048
Activated Carbon Medias
uANUA
•• Box 77457, Greensboro,
Date: November 9, 2023
Project: Grandview PS — Insulated Odor Control System
Location: Twin Falls. ID
Anua, in association with our local representative Coombs Hopkins, is pleased to
provide this revised AiraCarbT''.' odor control system budgetary proposal. We are
confident this system will eliminate your odor issues and provide years of trouble-
free operation.
The AiraCarbT'°1 treatment system is a highly effective activated carbon odor control
system designed for treating hydrogen sulfide (H2S), as well as reduced sulfur
compounds and VOC's. The system is completely shop-assembled and tested prior
to shipping. This makes installation fast and easy.
The system uses multiple layers of activated carbon. The lower level is AiraCarbT''.'-
HC media. a 4MM pelletized carbon media with a 0.30 g/cc H2S capacity. The media
is designed to primarily remove H2S. The upper layer of AiraCarb-COCO48 is a 48
mesh coconut shell-based media, designed to polish remaining odors.
Please do not hesitate to contact either myself. or Scott Forsling of CHC at (435)
659-7199, with any questions you may have about the proposal. We look forward to
working with you on this project!
Sincerely,
M�cl�a2� gu.scl�
Michael Busch
Business Development and Technical Manager
(346) 225-8033
michael.busch@anuainternational.com
JA►NUA►
PO Box .. .
I. DESIGN INPUTS
A. Permanent Installation Air Flow (max) 2,000cfm
B. Temporary Air Flow 650CFM
C. Average Inlet HZS <_10 ppm
D. Peak Inlet H2S <_25 ppm
E. Ambient Air Temperatures 0/1100 F
F. Expected H2S Removal > 99% or 0.5 ppm (max)
II. SCOPE OF SUPPLY One (1) AiraCarb Model 2x2x2H Odor Control
System, including:
A. One (1) Treatment Vessel:
1. System Footprint (Approx): 7.5' W x 12' L x 8.5' H
2. Material of construction: Bolted GRP modular panels. insulated sidewalls
3. Foul air inlet connection: 12" dia round
4. Operating under negative pressure
5. Internal media support structure
6. One (1) local read differential pressure gauge, 0-6" we
7. Two (2) 1-1/2" carbon sample ports. with PVC ball valves
8. One (1) 1" PVC condensate drain
9. Galvanized steel support structure
10. 22" dia quick-opening access manways
11. SS hardware, Butyl rubber gaskets
B. Activated Carbon Media — Lower Level:
1 . 2.400lbs of AiraCarbT1-HC media
2. 4MM pelletized
3. 0.30 g/cc H2S capacity
4. Dry weight:27-29 Ibs/ft'
5. Media loaded at factory
*,llllllllli' ANUA
•• Box 77457, Greensboro,
C. Activated Carbon Media — Upper Level:
1. 1,OOOlbs of AiraCarbT'"-COCO48 media
2. 4x8 mesh granular
3. Derived from coconut shells
4. Dry weight:27-29 Ibs/ft'
5. Media loaded at factory
D. Permanent Installation Fan:
1 . One (1) cast-aluminum blower req'd
2. Rated for 2,000CFM @ 8" we
3. 7.5HP (5.613HP) direct-drive TEFC motor, 230/3/60VAC
4. Arrangement 4
5. Epoxy-coated internal airstream
6. Aluminum slide-gate damper to isolate fan
7. Flanged inlet/ round inlet
8. Exhaust silencer on discharge to reduce noise
9. Sound blanket for fan housing to reduce noise
10. Mounted and wired at factory
E. Permanent Installation Fan Control:
1. One (1) NEMA4X FRP Cabinet
2. 7.5HP 1 ph to 3ph phase-converting VFD
3. Rated for 7.5HP, 230/3/60VAC fan motor
4. Designed for 120/1/60VAC incoming power supply
5. Mounted and wired at factory
*6' A►N UA►
•• Box 77457, Greensboro,
F. Temporary Site Fan:
1. One (1) cast-aluminum blower req'd
2. Rated for 650CFM @ 8" we
3. 2HP (1.42BHP) direct-drive TEFC motor. 120/1/60VAC
4. Arrangement 4HM
5. Epoxy-coated internal airstream
6. Aluminum slide-gate damper to isolate fan
7. Flanged inlet/ round outlet
8. Bolted directly to vessel top
9. Mounted and wired at factory
G. Temporary Site Fan Control:
1. One (1) 120V ON/OFF fan switch
2. Illuminated switch. RED when on
3. Plastic weather cover
4. 3' pigtail with 120/1/60VAC standard 3-prong plug
5. Mounted and wired at factory
H. Interconnecting Ductwork — Permanent Fan:
1 . PVC ductwork from treatment system discharge to permanent fan inlet
2. One (1) rubber flexible connector. with (2) SS band clamps, for fan inlet
3. PVC No-loss exhaust stack on fan discharge
4. Assembled at factory
I. Field Services:
1. One (1) trip. one (1) day on-site for start-up, commissioning, and operator
training.
4' A►N UA►
•• Box 77457, Greensboro,
III. Supplied by Others:
A. Off-loading, storage, or installation of supplied equipment
B. Taxes, duties, permits, or bonds
C. Properly sized concrete slab and anchoring
D. 120/1/60VAC electrical supply
E. Condensate drain plumbing
F. HVAC adjusting. balancing, or testing
G. Foul air ductwork to/from odor treatment system
H. Performance testing of system
IV. Warranty:
A. All equipment is warranted against manufacturers defect for 12 months after start-up,
or 18 months after delivery (whichever occurs first)
B. Carbon media carries no warranty.
V. Budgetary Pricing/Terms:
A. The budget price for the AiraCarbT1,1 Model 2x2x2H Insulated system, per this scope
of supply. is $115,400.00 (USD).
B. Price includes delivery to jobsite by LTL ground transportation. FOB factory
C. Pricing is valid for 60 days from date of proposal
D. Lead time for the system is as follows:
1. Submittal package: 3-5 weeks after receipt of executed contract
2. Equipment delivery: 8-10 weeks after release to fabricate
E. Payment terms:
1. 25% at delivery of submittal package
2. 65% at delivery of equipment
3. 10% at completion of start-up, or 120 days after delivery (whichever comes
first)
6: A►N UA►
PO Box .. .
Terms & Conditions
The following terms and conditions apply to all sales by ANUA International. LLC except to the
extent that it agrees in writing to otherwise.
Seller: ANUA International, LLC
Buyer: Any party who enters into a contract with Seller by which Seller agrees to produce or
assemble goods for Buyer.
Price: The price stated in Seller's quotation, unless Seller otherwise agrees in writing. However,
the price does not include sales, use, excise or other taxes or customer duties, costs of
nonstandard packaging or insurance. Buyer shall pay such taxes and costs directly or
reimburse Seller.
Shipment: Unless otherwise expressly stated herein, the goods are shipped in Ex Works ANUA
facility (EXW, Greensboro. NC) condition according to Incoterms 2010. Title and risk of loss
shall pass to Buyer upon delivery to the carrier. Unless otherwise directed by Buyer before the
date of shipment, Seller may select any reasonable method of shipment.
Delay: Delivery dates are approximate, dating from the receipt of all engineering and
manufacturing information.
Force Majeure: Seller shall have no liability to Buyer for Seller's delay or default in delivery due
to strikes. secondary boycotts, riots, wars, accidents, fires, floods, explosions, vandalism,
government embargoes, priorities or regulations. transportation delays, shortage of labor, fuel,
materials, supplies, power transportation facilities or tooling capacity or other similar causes
beyond Seller's reasonable control. Under no circumstances shall Seller have any liability for
penalties or other consequential damages of any kind resulting in whole or part from Seller's
delay in delivering or failure to deliver any products to Buyer as agreed.
Milestone Payment
Submittal 25%
Unit Shipped 65%
Commissioning, or 120 days after delivery 10%
Payments received after 7 business days shall be subject to an interest charge of the lower of
1.5% per month or the highest interest rate permissible by law. plus collection and attorney's
fees. Buyer shall make no set-off deduction without Seller's written consent.
v0 A►N UA►
•• Box 77457, Greensboro,
Date: November 2, 2023
Project: Mobile AiraCarb System — Mist Eliminator Assembly
Location: Twin Falls. ID
Anua. in association with our local representative Coombs Hopkins, is pleased to
provide this AiraCarbTNI mist eliminator assembly proposal. We are confident this
system will provide years of trouble-free operation.
Please do not hesitate to contact either myself. or Scott Forsling of CHC at (435)
659-7199, with any questions you may have about this proposal. We look forward
to working with you on this project!
Sincerely,
m chaez Busch
Michael Busch
Business Development and Technical Manager
(346) 225-8033
michael.busch@anuainternational.com
JA►NUA►
PO Box .. .
I. DESIGN INPUTS
A. Air Flow (max) 650 cfm
B. Ambient Air Temperatures 0/1100 F
C. Foul Air Temperature 50/105 F
II. SCOPE OF SUPPLY One (1) Mist Eliminator Assembly, including:
A. One (1) Vessel:
1. System Footprint (Approx): 1.5' W x 2.25' L x 4' H
2. Rectangular, flat-bottom tank
3. Material of construction: Rotomolded white plastic
4. Air inlet/outlet connections: 8" dia round
5. Operating under negative pressure
6. One (1) 8" threaded top internal access port, with lid
7. One (1) '/2" dia PVC condensate drain assembly, with ball valve
B. Media:
1. 11ft' of plastic, random dump media
2. 3.5° dia round
3. Void fraction 95%
4. Dry weight: <3 Ibs/ft3
5. Loaded in vessel at the factory
C. Interconnecting Ductwork:
1 . One (1) 10" dia x 10' long flexible ductwork piece
2. For connecting mist eliminator discharge to AiraCarb mobile system inlet
3. Flexible duct to include quick-connect ends
4. Shipped loose for assembly by others on-site
46' ANUA
•• Box 77457, Greensboro,
IV. Supplied by Others:
A. Off-loading, storage, assembly, or installation of supplied equipment
B. Taxes, duties, permits. or bonds
C. Field services
V. Warranty:
A. All equipment is warranted against manufacturers defect for 12 months after start-up,
or 18 months after delivery (whichever occurs first)
VI. Pricing/Terms:
A. The price for the AiraCarbT''.' free-standing mist eliminator assembly, per this scope of
supply, is $4,130.00 (USD).
B. Price shown is FOB factory, including shipping to jobsite by LTL ground.
C. Pricing is valid for 60 days from date of proposal
D. Lead time for the system is as follows:
1. Equipment delivery: 5-7 weeks after executed contract.
E. Payment terms:
1. 100% at delivery of equipment
OM' A►N UA►
•• Box 77457, Greensboro,
Terms & Conditions
The following terms and conditions apply to all sales by ANUA International, LLC except to the
extent that it agrees in writing to otherwise.
Seller: ANUA International, LLC
Buyer: Any party who enters into a contract with Seller by which Seller agrees to produce or
assemble goods for Buyer.
Price: The price stated in Seller's quotation, unless Seller otherwise agrees in writing. However,
the price does not include sales. use. excise or other taxes or customer duties, costs of
nonstandard packaging or insurance. Buyer shall pay such taxes and costs directly or
reimburse Seller.
Shipment: Unless otherwise expressly stated herein. the goods are shipped in Ex Works ANUA
facility (EXW. Greensboro, NC) condition according to Incoterms 2010. Title and risk of loss
shall pass to Buyer upon delivery to the carrier. Unless otherwise directed by Buyer before the
date of shipment, Seller may select any reasonable method of shipment.
Delay: Delivery dates are approximate, dating from the receipt of all engineering and
manufacturing information.
Force Majeure: Seller shall have no liability to Buyer for Seller's delay or default in delivery due
to strikes. secondary boycotts. riots. wars. accidents, fires, floods, explosions, vandalism.
government embargoes. priorities or regulations, transportation delays, shortage of labor. fuel,
materials. supplies. power transportation facilities or tooling capacity or other similar causes
beyond Seller's reasonable control. Under no circumstances shall Seller have any liability for
penalties or other consequential damages of any kind resulting in whole or part from Seller's
delay in delivering or failure to deliver any products to Buyer as agreed.
Milestone Payment
Unit Shipped 100%
Payments received after 7 business days shall be subject to an interest charge of the lower of
1.5% per month or the highest interest rate permissible by law. plus collection and attorney's
fees. Buyer shall make no set-off deduction without Seller's written consent.
v1 A►N UA►
•• Box 77457, Greensboro,