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CITftOF SAN BERNARDI. - REQUEA FOR COUNCIL AC"'N
Date: February 18, 1986
Subject: Installation of a Foul Air Scrubber
at the San Bernardino Wastewater
Treatment Plant
Mayor & Council Meeting of
March 3, 1986 @ 2:00 p.m.
From: Frank A. Schuma
Dept: Planning
Synopsis of Previous Council action:
None
Recommen1ed motion:
Adopt the Negative Declaration for the installation of one foul air scrubber
(Phase I, Unit I) at the Wastewater Treatment Plant located at 299 Blood Bank
Road. The scrubber will remove.odorous components from the foul air which is
ventilated from each wastewater process.
Signature
Phone:
5057
3
Contact person:
Frank A. Schuma
Supporting data attached: Project de,,-c,,-~ptio~,_ "."fety consi~-=_ Ward:
erations, mitigation measures, location map
FUNDING REQUIREMENTS: Amount: 0 Source:
Finance:
Cou nc it Notes:
75.0262
Agenda Item No.0t.
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.ACHMENT "A"
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Phasing
The project shall be phased and consist of up to five (5) foul air scrubbers
at the San Bernardino Wastewater Treatment Plant.
Phase I - Installation of one foul air scrubber
Phase II - With acceptable results (per NPDES requirements) of Phase I,
continue with the installation of two additional foul air scrubbers.
Phase III - Again, with acceptable results (per NPDES requirements) of Phase II,
continue with the installation of final two foul air scrubbers.
Description of Project
The five (5) foul air scrubbers are planned to remove odors from the foul
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air which is ventilated from inside the Unit 1 primary clarifier, preaerator,
north gravity thickener and Units 2N and 2S primary clarifiers.
The foul air scrubbers should each consist of a fiberglass enclosure ap-
proximately 5 to 10 feet in diameter and 20 to 40 feet in height. The fiber-
,
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glass enclosure should contain a plastic media bed approximately 5 to 15 feet
deep. Liquid sodium hydroxide, sodium hypochlorite chlorinated water or other
agents reactive with hydrogen sulfide will be recirculated to the top of the
plastic media bed. The liquid will cascade down through the clastic media
while the foul air is forced up through the media. Odorous compounds should
be removed by the subsequent chemical reactions which may occur between the
liquid and odorous compound. A portion of the recirculating liquid can be
wasted continuously or intermittently. The recirculating liquid can be
replaced with fresh liquid chemical solution so that a sufficient volume of
reactive material is always present in the solution to ensure that the
chemical reactions with the odorous compounds in the foul air occur with
maximum efficiency.
Each foul air scrubber can be equipped with at least one ventilation
supply fan, one liquid recirculation pump, one chemical feed pump and one
chlorine solution pump.
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A TTACHHENT "B"
Human Safety Potential
The foul air scrubbers are being considered to minimize the risk of
public exposure to offensive odors which do not achieve adequate dilution by
natural atmospheric processes before they reach the property boundary of the
Wastewater Treatment Plant. This could encourage community acceptance of the
existing wastewater treatment facility which has been surrounded by facilities
ut i I i zed by the general pub Ii c.
The certain types of foul air scrubbers may increase the quantities of
sodi um and fi lterab 1 e res i due di scharged in the plant effl uent duri ng norma 1
..
oprations. It is possible that each scrubber could discharge up to 450 pounds
of sodium per day into the plant effluent. It is possible that each scrubber
could discharge up to 950 pounds of filterable residue per day into the plant
effluent.
Sodium and filterable residue are currently regulated by NPDES Permit No.
85-71 for the San Bernardino Wastewater treatment facility. The San Bernar-
dino Water Department staff requested an increase in the NPDES effluent
discharge limitation for sodium from the previous limit of 85 mg/l to 95
mg/l. An increase in the NPOES effluent discharge limitation for filterable
residue from the previous limit of 535 mg/l to 545 mg/l was also requested.
The staff of the Regional Water Quality Control Board refused the City's
request for the increase, and approved NPOES Permit No. 85-71 using the
previous limitations of 85 mg/l for sodium and 535 mg/l for filterable
residue.
However, the staff of the Regional Board has agreed to consider
relaxing the discharge limitations for sodium and filterable residue if actual
scrubber operational data so dictates.
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ATTACHMENT "C"
Mitigation Measures
Construction can be performed by San Bernardino Water Department per-
sonnel. Potential negative impacts during construction can be minimized by
carefully schedul i ng the work duri ng dayl i ght hours, and the use of modern
construction equipment which are fitted with proper noise and emission con-
trols. Construction dust can be minimized by keeping the construction site
watered.
Operational impacts from noise and exhaust emissions from the four air
scrubbers can be mitigated by proper design of the mechanical equipment and
"
enclosures.
Adverse impacts caused by the increased sodium and filterable residue in
the plant effluent discharge can be mitigated by careful operation and moni-
'.
tori~g of the foul air scrubbers. The San Bernardino Water Department staff
will continue to work with the Regional \4ater Quality Control Board to ensure
that the. increased sodium and filterable residue concentrations in the plant
discharge are within the acceptable public health objectives established for
the Santa Ana River Basin.
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