Reduction of waste biosolids by RAS-ozonation: Model validation and sensitivity analysis for biosolids reduction and nitrification |
| |
| Affiliation: | 1. Laboratoire de Génie Chimique, U.M.R. 5503 CNRS/INP/UPS, Université de Toulouse, 4, Allée Emile Monso, 31432 Toulouse Cedex 4, France;2. Laboratoire PROMES, UPR CNRS 8521, Université de Perpignan, Via Domitia, 66100 Perpignan, France;1. Centro de Estudos de Fenómenos de Transporte, Departamento de Engenharia Mecânica, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias s/n Porto, 4200-465, Portugal;2. Centro de Matemática - UM, Departamento de Matemática, Universidade do Minho Guimarães, 4800-058, Portugal;3. Institute for Polymers and Composites/I3N, University of Minho, Campus de Azurém Guimarães, 4800-058, Portugal;4. Departamento de Engenharia Mecânica, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias s/n Porto, 4200-465, Portugal;5. Universidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, Sorocaba, Brasil;1. Department of Cardiology, LSUHSC-Shreveport, 1501 Kings Hwy, Shreveport, LA 71103, USA;2. LSUHSC-Shreveport, 1501 Kings Hwy, Shreveport, LA 71103, USA;3. Division of Pharmaceutical Evaluation & Policy, University of Arkansas for Medical Sciences, Little Rock, AR, USA;4. Department of Medicine, LSUHSC-Shreveport, 1501 Kings Hwy, Shreveport, LA 71103, USA |
| |
| Abstract: | Biosolids reduction model by return activated sludge ozonation was validated by simulating nitrification data compiled from our pilot-scale and the literature studies. Then, a global sensitivity analysis (GSA) was performed to identify influential and non-influential parameters for biosolids reduction efficiency, change in specific nitrification activity (SNA), and alteration to expected nitrification stability. In general, the model outputs were sensitive to operational and ozone reaction parameters, but not to biochemical parameters. For operational parameters, mainly temperature and initial solids retention time (SRT) influenced all model outputs. For biosolids reduction, increase in the degradability of the influent COD decreased the reduction efficiency. For SNA, the changes were highly dependent on the influent TKN/COD ratio. Our findings also imply that the stability of the nitrification process in ozonated systems should be enhanced at constant MLVSS for warm temperatures, but could be reduced at temperatures below 12 °C and aerated SRTs below 10 days. |
| |
| Keywords: | Activated sludge ASM3 model Biosolids reduction Global sensitivity Nitrification Ozonation Sludge |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
