authored by matthew s love, pe coauthored by jeffrey s lowe, pe reclaimed water storage: a dirty...

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?