The design of an alum stormwater treatment system

Conference · Wed Jul 01 04:00:00 EDT 1998

OSTI ID:20014950

Herr, J L; Harper, H H

This paper summarizes the evaluation and design of an alum stormwater treatment system which was designed to improve water quality in Lake Maggiore in St. Petersburg, Florida. Lake Maggiore is a 156-hectare hyperutrophic lake located adjacent to Tampa Bay in the City of St. Petersburg, Florida which receives untreated stormwater runoff from a 927-hectare urban watershed area. Documentation of water quality problems such as algal blooms, fish kills, nuisance macrophyte growth, and high bacteria levels date back as far as the early 1950s. An environmental assessment was conducted from 1989--1991 which concluded that an acceptable improvement in the tropic status could be achieved by an 90% reduction in annual loadings of total phosphorus from stormwater runoff and baseflow. The study recommended that alum treatment of stormwater and baseflow be implemented due to the low cost and high removal efficiencies. In 1993 and 1994, a Preliminary Design Report was prepared which included the development of hydrologic and nutrient budgets for the lake, laboratory testing to determine the effectiveness of alum for removal of pollutants contained in the stormwater and baseflow, and the preparation of preliminary designs, construction cost estimates, and annual operation and maintenance costs for six separate alum treatment systems. Upon acceptance of the Preliminary Design Report, five separate alum stormwater treatment systems were designed during 1995, including both an in-line system with direct flow input into the lake and off-line systems incorporated into the water management system of an adjacent golf course. Construction was completed in January 1998 and the system was in full operation by March 1998.

• Research Organization: Environmental Research and Design, Inc., Orlando, FL (US)
• OSTI ID: 20014950
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
COST
DESIGN
FLOCCULATION
FLORIDA
HYDROLOGY
PHOSPHORUS
RUNOFF
WATER POLLUTION CONTROL
WATER TREATMENT PLANTS