4th UF Water Institute Symposium Abstract

Submitter's Name Andrea Cumming
Session Name Poster Session: Water quality protection and treatment
Poster Number 66
Author(s) Paul Biscardi,  University of Central Florida (Presenting Author)
  Steven Duranceau,  University of Central Florida
  Evaluation of Coagulation and Adsorptive Treatment Technologies for Phosphorus Removal from the Middle St. Johns River Basin
  Background: Nutrient pollution is a widespread issue affecting Florida surface water. Phosphorus pollution, in particular can induce algae blooms and other water quality changes that can detrimentally affect the environment. A high priority and challenge for the stakeholders of water resources is to effectively identify and control phosphorus loading from non-point sources and in polluted surface water in order to reduce eutrophication and improve water quality. The Problem: The St. Johns River has been identified by the St Johns River Water Management District (SJRWMD) as “impaired for nutrients”. Geographically, the impairment is located within the upstream reaches of the Middle St Johns River basin in Lake Harney to the downstream reaches of the Lower St Johns River basin. The SJRWMD has initiated efforts to develop nutrient reduction projects that will address the impairment of the St. Johns River. The Study: Several innovative uses of adsorptive materials (including reuse of industrial by-products) are being considered for use in nutrient treatment of surface water. Isotherm models and column testing were conducted for four solid adsorbents including dried alum sludge, fly ash, Bold & GoldTM (UCF), and SorbtiveMEDIATM (Imbrium Systems Inc). Additionally, jar testing of two liquid coagulants aluminum chlorohydrate (ACH) and poly aluminum chloride (PACl) was conducted to determine their effectiveness for total phosphorus removal. Toxicity testing using Microtox was also included to evaluate secondary water quality impacts from these technologies. The Benefit: This study provides detailed insight into the potential for phosphorus treatment using various by-product materials as well as several proprietary technologies and the flexibility of their applications in the environment.