List of Articles فاضلاب های با بار آلودگی بالا Open Access Article Abstract Page Full-Text 1 - Performance of areation systems (activated sludge) with fixed bed for the treatment of wastewater with high organic load Amir Hesam Hassani Amir Hossein Javid Ali Torabian Seyed Morteza Hosseinian Amir Hayatbakhsh