GROUND WATER RECHARGE IN SOUTH FLORIDA: A PILOT STUDY OF HIGH-LEVEL WASTEWATER TREATMENT TECHNOLOGIES

摘要

The City of Sunrise's Southwest Wastewater Treatment Facility (SWWWTF) was investigating the option for upgrading the plant to meet advanced wastewater treatment (AWT) levels advanced technologies in order to treat wastewater to the level required for groundwater recharge through the use of rapid infiltration basins or trenches. The objective of this pilot study was to determine if these AWT technologies could be used to convert the City's SWWWTF to treat the raw wastewater to a level required for groundwater recharge in Broward County. Chapter 27 Water Quality Standards of the Code of Broward County, Florida, requires for any discharge to the groundwater must meet Total Phosphates (PO4-P) concentration of less than 10 μg/L (parts per billion). This pilot study specifically evaluated the multiple treatment trains combining BNR-MBR technology, reverse osmosis (RO), and chemical phosphorus removal at pilot scale and performed cost analysis for commercial "scale-up" application of treatment alternatives to full-scale wastewater reuse application. Pilot results indicated that the control stream removed orthophosphate to the levels of 10 μg/L 15% of the time and 100 μg/L 75% of the time. Stream A removed orthophosphate to less then 8 μg/L 100% of the time. Stream B effluent showed orthophosphate levels of 10 μg/L 35% and 100 μg/L 96% of the time on single sample basis and levels of 15 μg/L on an average basis. This data was then incorporated to develop an economic evaluation of a full-scale treatment process, along with the regulatory requirements associated with the proposed treatment processes.