Indirect Potable Reuse Pilot Test

Client: City of Hollywood
Location: Hollywood, FL

In response to Florida’s Ocean Outfall legislation, the City of Hollywood retained Hazen and Sawyer to investigate options for reuse required under the law. The legislation requires 60 percent (21 mgd) of the baseline flow that previously was discharged through the outfall to be reused for a beneficial purpose. After a review of the legislation, discussions with regulatory agencies and consideration of available options for reuse applications, Floridan Aquifer recharge was identified as the most cost-effective and environmentally-friendly alternative to satisfy the regulation.

Pilot testing developed a treatment approach that minimizes the need for reverse osmosis treatment, potentially greatly reducing capital and operating costs.

The goal of the pilot test (schematic seen here) was to demonstrate acceptable emerging contaminant oxidation using alternative treatment technologies that are more cost-effective and have a smaller carbon footprint.

The test protocol included several process components in two flow streams. Pictured here is the UV-AOP component of the pilot system.

The ozone component of the pilot system.

The ion exchange component of the pilot system.

The BAC filter component of the pilot system.

The ultrafiltration component of the pilot system.

Project Outcomes and Benefits

  • Developed a treatment approach that minimized the need for reverse osmosis treatment that is typically used for indirect potable reuse, potentially greatly reducing capital and operating costs.
  • Demonstrated acceptable emerging contaminant oxidation using treatment technologies alternative to MF/RO/UV-AOP that are more cost effective and have a smaller carbon footprint.
  • Produced water that satisfied primary and secondary drinking water standards with the exception of certain constituents present in the Floridan Aquifer, such as chloride.
  • Included the following process components in two flow streams - diverted secondary effluent from the wastewater treatment plant clarifier, chlorine addition, deep bed media filtration, ultrafiltration, ion exchange (TOC, Ammonia, Phosphate), ozone, UV-AOP, and BAC filters.
  • Monitored several emerging contaminants that may be regulated in the future.
  • Pilot test found that both process schemes are viable options for recharge in Broward County and to the state reuse requirement.

For more information on this project, or to discuss a similar project in your area, contact Enrique Vadiveloo at evadiveloo@hazenandsawyer.com