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X-WR-CALNAME;VALUE=TEXT:UMCES Events
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DTSTART:20201101T020000
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DTSTART:20210314T020000
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UID:calendar.22556.field_date_time.0@www.umces.edu
DTSTAMP:20260405T170613Z
CREATED:20210510T131206Z
DESCRIPTION:May 21\, 2021 1:00pm to 2:00pm    \n    \n      \n\n\n    \n\n 
              \nInstitute of Marine & Environmental Technology\n      \n\n
 \n\n\n  \n\n    \n\n              \n\n\n      \n  \n\n    \n\n            
   \n\n\nTitle: Bahamian oolitic aragonite sand impact on water quality and
  mitigation of phosphate and phosphorus removal and recovery in recirculat
 ion aquaculture systems\n\n\n\nSpeaker: Steven Rodgers (Ph.D. Candidate)\n
 \n\n\nAbstract:\n\n\n\nRecirculating aquaculture systems (RAS) require man
 agement of water conditions to ensure animal health and limit nutrient dis
 charges.  Oolitic aragonite sand (OAS) forms from whiting events off the c
 oast of the Bahamian Islands is a sustainable\, renewable and effective in
  controlling water quality.  Cyanobacteria mediate the precipitation of ar
 agonite by capturing CO2\, internally forming CO32-\, which reacts with Ca
 2+ in seawater forming CaCO3 precipitations. \n\n\n\nStudies in freshwater
 \, brackish and marine waters maintained stable pH and alkalinities.  Init
 ially\, OAS removed phosphate rapidly\, slowing afterwards. The OAS remove
 d phosphate at rates of 716\, 705 and 215 mg PO4/ kg OAS for freshwater\, 
 brackish and marine water\, respectively. A system with daily P additions 
 showed a removal capacity of 77.8 mg P /kg OAS.  Treatment of phosphorus e
 xposed OAS with 1.0% and 2.0% citric acid solutions show phosphate removal
 s ranging from 17.3% to 93.5%. The citric acid increases the OAS surface a
 rea 1.66 times to 4.628 m2/g OAS\, confirmed by SEM. Microbiome analysis s
 how similar bacterial phyla exist on the naïve OAS and the OAS used in dif
 ferent salinities.\n\n\n\nUnder anaerobic conditions\, the control of syst
 em conditions were favorable for denitrification and anammox processes to 
 occur. In freshwater\, a loss of 215.8 gram of nitrogen (a loss of 90.5%) 
 of the added nitrogen to the system occurred. In marine conditions\, a los
 s of 253.04 g nitrogen\, representing an 87.6% loss\, occurred.  Microbiom
 e analysis identified phyla known to function as denitrifiers\, though lac
 king known phyla for anammox bacteria. Losses of nitrogen in both saliniti
 es is likely due to denitrification\, as oppose to anammox. \n\n\n\nOAS in
  RAS holding Eastern and Pacific oysters\, showed dissimilar responses.  T
 he water quality remained in acceptable ranges for oyster growth.  The sur
 vival in Eastern oysters (≥80%) contrasted with the Pacific oysters (≤56%)
 .  Weight increases occurred only with the Eastern oysters.  Both species 
 shows increases in shell length\, width and height\, but unchanged or decr
 eases in weight.  Reduced somatic growth and limited shell development occ
 urred\, perhaps due stresses from nitrogen spikes in the systems. OAS show
 s no positive advantage with oyster growth. \n\n\n\nHost: Dr. Allen Place
 \n\n\n\nIf you would like to attend virtually\, please email imetdirectors
 office@umces.edu
DTSTART;TZID=America/New_York:20210521T130000
DTEND;TZID=America/New_York:20210521T140000
LAST-MODIFIED:20210510T131206Z
SUMMARY:Virtual IMET Defense: Steven Rodgers (Ph.D. Candidate)
URL;TYPE=URI:https://www.umces.edu/events/virtual-imet-defense-steven-rodge
 rs-phd-candidate
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