3rd UF Water Institute Symposium Abstract

Submitter's Name Yu Qiao
Session Name Posters - Innovative Biological, Physical, and Chemical Nutrient Reduction & Recovery Technologies
Category Innovative biological, physical, and chemical nutrient reduction & recovery technologies
Poster Number 27
Author(s) Qiao Yu,  Florida State University (Presenting Author)
  Ozone Pre-Treatment to Enhance Anaerobic Degradation of Refractory Landfill Leachate Organics.
  When conventional biological treatment alone is not adequate for treatment of low-flow, high-strength wastewaters (e.g, landfill leachate), Advanced Oxidation Processes (AOPs) have been investigated as a precursor to biological treatment. These processes involve generating the hydroxyl radical (∙OH), a nonselective, highly reactive oxidizing species. Ozonation alone, and O3+H2O2 can both favor the production of ∙OH, and can increase the biodegradability of landfill leachate. This research studied the effectiveness of O3 and O3-H2O2 as a precursor to anaerobic biological treatment of landfill leachate. The main reasons anaerobic biological treatment instead of aerobic biological system was conducted in this research are due to its higher organic loading, good process stability, lower nutrient requirements, and lower operating costs compared with aerobic system. An incubation of leachate with anaerobic sludge in an oxygen-free reactor was used as the anaerobic biological treatment method in this research. Three chemicals: Tris(2-chloroethyl) phosphate (TCEP), Tris(2-butoxyethyl) phosphate (TBEP), and 17-b-Estradiol (E2) were chosen as representative refractory organic contaminants found in municipal landfill leachate. Molecular structures of the three compounds are shown below: TCEP TBEP E2 Different dosages of O3 and O3+H2O2 were added to the leachate that contained mg/L concentrations of the three chemicals mentioned above. Leachate samples mixed with sludge were taken from the reactors after days of incubation to quantify the degradation of the three contaminants. The aim of this research was to quantify the impact of advanced oxidation pretreatment on further anaerobic biological treatment, and to assess the impact on co-metabolism of 3 contaminants. The varying degree of anaerobic degradation with and without pre-ozonation treatment will be presented.