ats507wr.ppt/1 - UF Water Institutewaterinstitute.ufl.edu/symposium/downloads/presentations/... ·...
Transcript of ats507wr.ppt/1 - UF Water Institutewaterinstitute.ufl.edu/symposium/downloads/presentations/... ·...
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Project Objectives
• Model Fate and Transport of Microcontaminants in AWT Effluent
• Evaluate Advanced Wastewater Treatment through Pilot Testing
• Determine AWT Effluent ToxicityChronicAcute
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DEETTriclosanEthynyl estradiol
Bisphenol-a surfactants
Reuse Also Means Environmental StewardshipProject Addresses Microcontaminant Concerns Related to Human Health and Environmental Impact
“They're in the Water... They Make Fish Change Sex...Endocrine Disruptors-What are they doing to you?”
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Fate and Transport of Microcontaminants is Being Modeled
Simulated Injection of Microconstituents
Biodegradation of Organics
Photolysis of Organics
Sorptionof Organics
Trace Organic Concentrations Estimated at Extraction Wells
AWT Facility
Aquatic Organism Impacts
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MBReffluent
RO brine
RO effluent
Primary Clarification
MBR
Aeration BasinSecond
Clarification
RO UV
Microcontaminants are Being Tracked Through Two AWT Configurations
Sampling locations of MBR train:
UFeffluent
RO brine
RO effluent
Primary Clarification
UF
Aeration BasinSecond
Clarification
RO UV
Sampling locations of UF train:
TertiaryClarification
Denitrification Filter
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RO effluentRO brine
Preliminary Results for AWT Removal of Microcontaminants Show Promise
Microcontaminants in RO effluent are below detection limits!
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Microcontaminant Concentrations and Effluent Toxicity are Being Correlated to Aquatic Organism Impact
• Hormonal Response Through Tissue Bioassays
• Acute Fish Toxicity
• Acute Water Flea Toxicity
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Results of Hormonal Response Through Tissue Bioassays (E-Screen)
RO effluent didn’t produce a significant response in MCF-7 cells, a breast cancer cell line that proliferates in response to estrogenic activity.
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MBR effluent RO effluent blank
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Results of Pilot AWT EffluentToxicity Tests - test organisms
EPA 821-R-02-013 Test Method 1002.0
fathead minnow, Pimephales promelas
waterflea, Ceriodaphnia dubia
EPA 821-R-02-013 Test Method 1000.0
http://www.state.sd.us/DENR/DES/Surfacewater/cerdaph.gif
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100% 75% 25% 12.5% 6.25% 0% (control)
MBR effluent concentrations relative to organism media
Surv
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P. promelas on 10/29/07P. promelas on 11/26/07 (dechlorinated)P. promelas on 1/14/08 (no chloramine added)C. dubia on 10/29/07C. dubia on 11/26/07 (dechlorinated)C. dubia on 1/14/08 (no chloramine added)
MBR effluent shows minimal acute toxicity
No significant survival differences were observed on all test days, except for C. Dubia in 100% MBR effluent without de-chlorination on 10/29/07.
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100% 75% 25% 12.5% 6.25% 0% (control)
RO effluent concentrations
Surv
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P. promelas on 10/29/07P. promelas on 11/26/07 (dechlorinated)P. promelas on 1/14/08 (no chloramine added)C. dubia on 10/29/07C. dubia on 11/26/07 (dechlorinated)C. Dubia on 1/14/08 (no chloramine added)
RO effluent increases organism sensitivity to chlorine
De-chlorination on 11/27/07 significantly increased the survival of P. Promelas and C. Dubia. No significant survival differences were observed in P. Promelas or C. Dubia after complete removal of chloramine on 1/14/08.
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Summary
• The developed fate and transport model may be a valuable tool to track microcontaminants in wastewater effluents
• Reverse osmosis treatment shows promise for microcontaminant removal
• Chlorine residual plays significant role in AWT effluent acute toxicity to indicator organisms.
• Non-chlorinated AWT effluents show no signs of acute toxicity.
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Project Team
Microcontaminant Research and Project Management -South Florida Water Management District and Carollo Engineers
Pilot Plant Design, Operation, and Sampling -City of Plantation and Hazen and Sawyer
Laboratory Work -Univ. of Florida at Gainesville (hormonal bioassays and toxicity), University of Wisconsin (hormonal bioassays), Montgomery-Watson Harza (trace organics), Golder (toxicity), Carollo (particle analysis)
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Project TeamMicrocontaminant Fate and Transport Modeling -
DHI Water and Environment
Expert Advisory Panel -Dr. Jorg Drewes, Membrane Treatment ProcessesDr. Shane Snyder, Water Quality and ToxicologyDr. Erin Snyder, Toxicology