Post on 23-Dec-2015
transcript
Authored by Matthew S Love, PE
Coauthored by Jeffrey S Lowe, PE
RECLAIMED WATER STORAGE:A DIRTY LITTLE SECRET
Injection Well, RIBs and Surface Water Discharge
Storage & Disposal Options:
Storage Tanks
Storage Ponds
What’s The Problem With Ponds?
Algae
Florida Fine Sands (Sugar Sands)
Wildlife (Fish, Turtles, Duckweed)
Regardless The Process?
FacilityCapacity(MGD)
Type of Process
Pond Storage
NWRFManatee County
7.5MTMADF
Carrousel232 MGUnlined
SEWRFManatee County
11MTMADF
Carrousel352 MGUnlined
SWWRFManatee County
15AADF
Conventional144 MGUnlined
EWRFCity of Venice
6MTMADF
Bardenpho35 MGLined
NWRF
SEWRF
SWWRF
EWRF
Steps Taken To Clean Up The Pond
• Algal Enumeration & Particle Size Distribution
• Pilot Testing of Filtration Equipment
• Process Improvements
• Intake Structure Improvements
Algal Enumerations80% - Blue-Green Algae or
Cyanobacteria (< 10 micron)20% - Yellow-Green Algae, Green Algae,
Diatoms & Flagellates
Algal Zone in Top 18”
N & P
Particle Distribution – The Typical Florida Sands
80% < 275 microns 60% < 200 microns 25% < 150 microns 10% < 75 microns
Residential Irrigation < 200 micron
Micro-irrigation < 75 micron
Targeted 25 micron
Average Capture of 65% Solids
Pilot Testing Different TechnologiesSalsnes Filter
Gravity Filter
Synthetic Mesh Media
Applications in Pretreatment, Fisheries, Pulp and Paper
Pilot Testing Different TechnologiesAmiad Filter
Pressure Filter with Stainless Steel Media
Needed Pressure Required Upgrades to Remote Pump Stations
Can Not Return Waste Backwash Water Directly to Ponds
Pilot Testing Different TechnologiesNova Disk Filter
Gravity Filter with Stainless Steel MediaMet Removal Targets at 25 microns
NWRFSWWRF
ProcessImprovements
BIOLOGICALTREATMENT
TERTIARYFILTRATION
DISINFECTION
RCW STORAGE
POND
RCW DISTRIBUTION
RCWSYSTEM
WASTEWATER PERMIT COMPLIANCE ZONE
Intake Structure ImprovementsPassive Wedge Wire Screens
Concrete Apron & Sump
Decreased Grating Size: 2” to 1” Opening
Questions?