HomeMy WebLinkAboutCity of Oviedo West Mithcell Hammock Water Treatment Facility ��� °• �Rr CITY OF OVIEDO
WEST MITCHELL HAMMOCK WATER TREATMENT FACILITY
ALTERNATI E PROCESS D IAG RAM
Air Ground High
Pretreatment Quality Transfer Storage Service
(pH Adjustment) Aeration Control Pumping Tank Pumping
Hydrogen
Sulfide Sodium - Chlorine _ Venturi
Off-Gas Hydroxide \, Flow
tMeter
Well -- Chlorine —
Pumping Carbon — - "'•""'�"` Sodium
Dioxide Sodium
Hydroxide Ammonia �� Hydroxide To
Meter Mixer Meter Chlorine Distribution
Saubber scrubber I System
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Soil Formation
Approximate Depth=300'
Upper Floridan Aquifer
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CITY OF OVIEDO
FORCED DRAFTAERATION
TREATMENT OBJECTIVES:
1 Produce a stable and
aesthetically pleasing water that
exceeds regulations using
proven technology.
1 Remove hydrogen sulfide to
acceptable levels.
1 To reduce corrosion and improve
taste.
OPERATION PRINCIPLES:
1 Hydrogen sulfide exists as a gas
and can be removed by aeration.
/ Aeration occurs as air and water
pass through the aerator in
opposite directions (e.g., counter
currently)
1 Uses packing material to achieve
intimate contact between water and
air streams.
/ Hydrogen sulfide removal is
enhanced by pretreating feed water
with carbonic acid to reduce pH to
6.0 - 6.5.
BENEFIT~ TO CITY:
/ Pilot plants provide site-specific
cost and performance
information.
1 A reduction of corrosion,
turb~dity, and taste and odor in
the City's distribution system.
/ Process optimization.
~ Prowides design engineering
information.
PARTICI~ANTS:
1 Jac~b's Air Water Systems
Tampa, FL
1 University of Central Florida,
College of Engineering,
Environmental Systems
Engineering Institute, Orlando,
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and Odor Control Process'
' Orange Courrty Eastem Regional Water Treatment Facllity, Floride
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OVIEDO
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~-~.,~ ODOR CONTROL
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TREATMENT OBJECTIVE: w
TYPES OF SYSTEMS TESTED, continued:
1 Capture and treat odorous water treatment plant off-gas prior to 3. Catalvzed Carbon
release and dispersion to the atmosphere. Since there are several ~ Odorous hydrogen sulfide off-gas is directed through a series of
different technologies available today to treat odorous process
' chambers containing catalyzed granular activated carbon canisters.
s new 1NTP.
streams, several are being evaluated for the City ~ Off-gas passes radially through the carbon where H2S is converted
to sulfuric acid (HZSO4) and elemental sulfur (S°).
TYPES OF SYSTEMS TESTED: 1 Loosely adsorbed sulfuric acid is washed off during periodic water
1 Technologies under evaluation include physical, chemical and regeneration cycles, partially restoring the capacity of the carbon.
biological type systems. 4. Biofiltration
1. Granular Hvdroqen Sulfide Reactant 1 Engineered environment consisting of natural organic (compost) or
1 A static granular media process, inorganic (lava rock) media.
1 Odorous H2S gas is sequestered within a reactive media. 1 Provides a complete ecosystem for select microorganisms to
1 Proprietary chemical composition and removal mechanism. proliferate and metabolize H2S.
/ Spent media is composed largely of iron pyrite. 1 Microorganisms thrive in a warm, moist, and nutrient rich
1 Relatively constant treated off-gas concentration until media environment. Forced-draft aeration provides added benefit by
exhaustion and breakthrough. acting as a humidifier to achieve maximum off-gas water vapor
1 After media is exhausted new media is inserted. content.
2. Packed Tower Scrubber ~ENEFITS TO THE CITY:
/ Two-stage counter-current treatment process (e.g., upward off-gas 1 Controlled emissions of odorous hydrogen sulfide off-gas.
flow and downward liquid flow). / Maintain good neighbor policy with surrounding businesses and
1 Hydrogen sulfide is transferred from off-gas stream to chemical residential communities.
scrubbing liquid. / Reduces costs associated with maintaining exposed metal surfaces
1 Uses low density media to maximize scrubbing liquid/off-gas and the neighboring structures.
/ interface.
First stage utilizes sodium hydroxide at pH above 10 promoting PARTICIPANTS: *
disassociation of odorous HZS to non-odorous bisulfite (HS-). ~ The Sulfatreat Company, St. Louis, Missouri
/ Second stage utilizes sodium hydroxide and an oxidant, typically 1 Jacobs Air Water Systems, Tampa, Florida
sodium hypochlorite (e.g., bleach), to convert disassociated ions to ~ Biorem Technologies, Ontario, Canada
destroy the remaining odor. / Moss Kelly, Inc., Lake Mary, Florida
/ US Filter Westates Carbon, Baytown, Texas
* Mention of trade names does not constitute endorsement by City andlor Boyle Engineering Corporation.
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TREATMENT OBJECTIVES:
/ Satisfy multiple water quality
objectives, particularly removal of:
CITY OF OVIEDO
MEMBRANE SOFTENING
-~ Chlorides
- . Hardness or mineral content.
- Carbon content (TOC)1 disinfection
~ by-product precursors.
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OPERATION PRINCIPLES:
1 P
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essure-driven process that
parates contaminants from water
~ing a semi-permeable membrane.
iw groundwater is pretreated using
rtridge filters and chemical
Idition to protect membranes from
ispended solids accumulation and
ineral scale.
etreated feedwater passed through
~nembrane array.
~ncentrate water is treated and
:her re-used or discharged as a
~ste stream.
BENEFIT~ TO CITY:
1 Mem~arane softening provides
PARTICIPANTS:
long-term regulatory compliance.
1 Best available technology for
disinfection by-product precursor
rempval (TOC).
1 Pilot testing enhances full-scale
desi~n.
/ Harn RIO, Venice, Florida
1 Dow FilmTec, Jupiter, Florida
1 Osmonics, Minnetonka, Minnesota
1 KOCH Fluid Systems, Venice
Florida
1 SAE~IAN Industries, Seoul, Korea
/ University of Central Florida,
College of Engineering,
Environmental Systems
Engineering Institute, Orlando, FL
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Figure 1: Proposed water treatment process
integration of inembrane softening.
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Figure 2: Single element membrane cut•away.
Figure 3: Full-scale membrane soRening treatment facility.
City of Oviedo - - - - - - - - - - - - - - - - - - - - -
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