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Home My WebLink AboutCity 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 ` * Meter i Soil Formation Approximate Depth=300' Upper Floridan Aquifer ~~~Et~~-F~~kt ~~ °, `~;,~ ~k~ ~'i ;~ ,~~ ~ 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, ,.o 0.9 0.8 o., o.s n 0.5 ~.4 0.3 0.2 0.1 0~ 2 pH l ~ of pH and Odor Control Process' ' Orange Courrty Eastem Regional Water Treatment Facllity, Floride ~ ~~~ CITY OF ~ ``~ ~/l~~ OVIEDO ~, ~ ~ ,~~~ ;~ ~-~.,~ ODOR CONTROL - 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. ~ ~ ~~ ~ ~ ~"~ ~~~~'1i0-FLprr1r ~; ~ ~~ ~ ~ ~~: ,i ~~~ , ~ 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. «_~ F _ . .'6,~'~~~'~? ~"6~~,} ~~. ~ ~ OPERATION PRINCIPLES: 1 P s~ u / R c a s 1 P a / C 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 ~~o~~~ ~ ~~ , ~~~oo~x ~--~ ~F~~i I C~~ROL FEFRi(~ YSlfu L _ I unXELP wnRR rI Xp9ma J ~4h (omauNl Mrsl[ N 3Wm I q~l~l vp~SO: i0 Oi51RIBMON ~ ~ ~ Figure 1: Proposed water treatment process integration of inembrane softening. ~ Figure 2: Single element membrane cut•away. Figure 3: Full-scale membrane soRening treatment facility. City of Oviedo - - - - - - - - - - - - - - - - - - - - - 1 I I I Mitche Hammock Water Plant 1 Alternative Configuration 1 - 1 FUTURE 1 WETLANDS SITE STORAGE I I PROPOSED PROPERTY BDRY WETLANDS 1 1 I I CRESTED 1 - I I P�A : � I N I I I 1 4. EMI AL _ _ _ OR GE ' 0 R UN ! TOR I MCCGE . G A N! f� G I . ANK m cn T E - fl n z I i I r 1 1 ,1 0 I s v .. ................... I 1 AOO�SS 1 I - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - �