City of Plantation's Indirect Potable Reuse Pilot Project: Approaches to Meeting Extreme Nutrient LimitsCisterna, Richard Edition: Vol. - No.
American Water Works Association / 01-Nov-2009 / 40 pages

This powerpoint presentation begins by providing a brief overview of the City of Plantation, Florida's search for alternative water sources. After considering several alternative strategies, Plantation decided on indirect potable reuse -aquifer recharge, which required consideration of several important factors including: nutrient control; aquatic organism impact; micro-constituents; recharge modeling; sustainability; public outreach; and, cost. The Plantation pilot plant is presented with information concerning it's membrane bioreactors (MBR) and conventional treatment schemes including: total nitrogen (TN) and total phosphorus (TP) removal ofMBR and reverse osmosis (RO) Pilot Units; and, TN and TP removal ofDeep Bed Filter and RO Pilot Units. Presentation conclusions concerning nutrient removal include:both pilots met stringent TN and TP limits;RO membranes are necessary to meet TP limit; and,membranes alone (UF/RO) with no chemical addition metTN and TP limits. Micro-constituent removal by RO membranes is presented, along with toxicity to aquatic organisms. Presentation summary includes the following: the pilot demonstrated to meet stringent nutrientlimits at different test conditions;RO membranes are necessary for surface waterdischarge due to stringent TP limits; almost all micro-constituents were removed byRO system;RO permeate could be toxic, re-stabilization/re-mineralizationis necessary; and,the observed toxicity to aquatic organisms was likelycaused by chloramines. Other forms of RO pretreatmentshould be evaluated. Includes figures.

Keywords: Reverse Osmosis; Membranes; Nutrients; Toxicity; Potable Reuse; Recharge; Pilot Plants; Reactors; Discharge; Costs; Phosphorus; Pretreatment; Florida; Nitrogen

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