Use of an Algal Turf Scrubber ® to Reduce Nutrient Loadings and ...
Use of an Algal Turf Scrubber ® to Reduce Nutrient Loadings and ...
Use of an Algal Turf Scrubber ® to Reduce Nutrient Loadings and ...
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<strong>Use</strong> <strong>of</strong> <strong>an</strong> <strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong> ®<strong>to</strong> <strong>Reduce</strong> <strong>Nutrient</strong> <strong>Loadings</strong> <strong>an</strong>d ProduceBi<strong>of</strong>uel at a Wastewater Treatment Pl<strong>an</strong><strong>to</strong>n Jamaica Bay New York CityPeter I. May, Ph.D.Biohabitats Senior Environmental ScientistRes<strong>to</strong>re America’s Estuaries, Galves<strong>to</strong>n, TexasNovember 16, 2010
What is <strong>an</strong> <strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>®?• A culture unit for attached algae• The algae remove nitrogen <strong>an</strong>d phosphorus from <strong>an</strong>ywater source• The algae is regularly recovered <strong>an</strong>d processed• Recovery <strong>of</strong> algal biomass maintains the culture units in <strong>an</strong>accelerated growth phase• <strong>Nutrient</strong>s are continuously recovered <strong>an</strong>d removed fromthe treatment unit
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>®Project His<strong>to</strong>ry<strong>an</strong>d Timeline
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>®Early Stage Development1970s – 1980s
Patterson ATS(1995-1996)St<strong>an</strong>islaus County, CA0.2 MGD x 500’
HMI Aquaculture ATS(2000-2002)Okeechobee County, FL30 MGD x 220’
S-154 ATS with WHS Pre-Treatment (2003-2004)Okeechobee County, FL1-6 MGD x 300’
Taylor Creek ATS(2007-2009)Okeechobee County, FL15 MGD x 300’
Egret Marsh ATS(2010)Indi<strong>an</strong> River County, FL10 MGD x 575’
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® SystemsPilot <strong>an</strong>d Full Scale Locations
Research Partners
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® Research• Smithsoni<strong>an</strong> Institution• US Department <strong>of</strong> Agriculture• Sta<strong>to</strong>ilhydro• University <strong>of</strong> Maryl<strong>an</strong>d• Constellation Energy• University <strong>of</strong> Florida• William <strong>an</strong>d Mary•Virginia Institute <strong>of</strong> Marine Science• University <strong>of</strong> Western Michig<strong>an</strong>• University <strong>of</strong> Ark<strong>an</strong>sas• University <strong>of</strong> Georgia
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® Design
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® DesignSystem InflowWater is surged down the sloped floway in a pulsing motion.The pulsing surge stimulates algal growth.
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® Design<strong>Algal</strong> <strong>Turf</strong> FlowayThe algal turf biomass is recovered on a 7-14 day cycle usingHydroMentia’s proprietary harvest design. The recovered algalbiomass contains excess nutrients removed from the water.
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® DesignBiomass Production<strong>Algal</strong> turf or dense mats <strong>of</strong> simple algae are cultivated on the surface <strong>of</strong>the floway. As the algae grow, they remove nutrient pollut<strong>an</strong>ts(phosphorous <strong>an</strong>d nitrogen) from the water.
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® DesignCentralized Biomass RecoveryHarvested algae is conveyed by the water via a concrete flume <strong>to</strong> acentralized recovery facility.
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® DesignCentralized Biomass Recovery System
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® DesignCentralized Biomass RecoveryThe harvested algae is removed from the water with a Flex Rake.
<strong>Algal</strong> Biomass Products
<strong>Algal</strong> Biomass ProductsBi<strong>of</strong>uel ProductionOmega 3sCompost/Org<strong>an</strong>ic FertilizerLives<strong>to</strong>ck Feed
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>®Technology Adv<strong>an</strong>tages
<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® Water TreatmentStrategic Adv<strong>an</strong>tages:• High Level Treatment Capabilities –Res<strong>to</strong>ration <strong>to</strong> Background Levels• Lower Treatment Costs• <strong>Reduce</strong>d L<strong>an</strong>d Requirements• Revenue Generating Byproducts
Lower TreatmentCosts
LOWER TREATMENT COSTS - NitrogenTypical Nitrogen Reduction Unit Costs <strong>to</strong> Comply withTMDLs in the Lower St Johns River WatershedSource: CH2MHill, 2007. LSJR Main Stream <strong>Nutrient</strong> TMDL<strong>Algal</strong> <strong>Turf</strong><strong>Scrubber</strong>®25 15-60 Assumes direct treatment <strong>of</strong> impaired surface water orUltra-AWT treatment <strong>of</strong> wastewaterSource: HydroMentia, Inc.
LOWER TREATMENT COSTS - Phosphorus[1] HydroMentia. April 2005. Single Stage <strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>Present Worth Cost & By-Product Market Analysis. (TPIN=200ppb, TPOUT=146 ppb, 27.0% Removal, 56,000 AF/yr)$70.00$62.00[2] USACE, SFWMD, HDR. Oc<strong>to</strong>ber 2003. Lake OkeechobeeWatershed Project Draft PIR, Water Quality Treatment R<strong>an</strong>king(TPIN=261 ppb, TPOUT=100 ppb, 61.6% Removal, 97,500AF/yr)50-yr Present Worth Cost ($/lb P-Removed)$60.00$50.00$40.00$30.00$20.00$10.00$28.68$0.00Treatment Wetl<strong>an</strong>d - Phosphorus<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>® - PhosphorusIn order <strong>to</strong> compare the cost <strong>of</strong> the ATS <strong>to</strong> the cost <strong>of</strong> treatmentwetl<strong>an</strong>ds, each system’s capital costs, operating costs <strong>an</strong>d amounts <strong>of</strong>phosphorus removed over a 50-year period are discounted <strong>to</strong> presentworth.
<strong>Reduce</strong>d L<strong>an</strong>dRequirements
REDUCED LAND REQUIREMENTS – Phosphorus800800Phosphorus Areal Removal Rate (lbs/acre/yr)70060050040030020010010Treatment Wetl<strong>an</strong>ds200<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>300Low <strong>Nutrient</strong> Source WaterHight <strong>Nutrient</strong> Source Water
REDUCED LAND REQUIREMENTS – Nitrogen70006500Nitrogen Areal Removal Rate (lbs/acre/yr)600050004000300020001000150Treatment Wetl<strong>an</strong>ds1000<strong>Algal</strong> <strong>Turf</strong> <strong>Scrubber</strong>5000Low <strong>Nutrient</strong> Source WaterHight <strong>Nutrient</strong> Source Water
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