@article{
  author = {Hassani, Amir Hesam, Javid, Amir Hossein, Torabian, Ali, Hosseinian, Seyed Morteza, Hayatbakhsh, Amir},
  title = {Performance of areation systems (activated sludge) with fixed bed for the treatment of wastewater with high organic load},
  journal = {Journal of Environmental Science and Technology},
  year = {2009},
  volume = {11},
  number = {4},
  pages = {1-10},
  doi = {}
}