List of Articles Activated sludge Open Access Article Abstract Page Full-Text 1 - A Survey on Efficiency of Natural Wastewater Treatment Systems and Activated Sludge for Municipal Wastewater Treatment Reza Shokoohi Abdollah Dargahi Amir Karami 10.30495/jest.2018.15742.2426 Open Access Article Abstract Page Full-Text 2 - 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 Open Access Article Abstract Page Full-Text 3 - Evaluating the performance of extended aeration process in treatment of hospital wastewater and determining its kinetic coefficients- Case study: Wastewater Treatment Plant of Quds Hospital in Sanandaj Meghdad Pirsaheb Abdollah Dargahi AliAkbar Zinatizadeh Razieh Khamutian Mojgan Mashirpanahi Hafez Golestanifar Open Access Article Abstract Page Full-Text 4 - Evaluation of the performance of Hospital Waste Water Treatment with Activated Sludge and Extended Aeration System using Activated Carbon for the Removal of Lambda-cyhalothrin Pesticide M. Mamaghanifar L. Yadegarian H. Ghafourian Open Access Article Abstract Page Full-Text 5 - Comparison of Biosorption of Heavy Metal Zinc by four different Microbial Biomas (Activated sludge) in Industerial Waste Water in order to Biological Refinement Azita Khosravan Javid Amini Samira Sarsalary Elham Rohanian Open Access Article Abstract Page Full-Text 6 - Optimization of Aeration for Improving Performance of Hospital Wastewater Treatment Plant Zahra Hezarian ehsan derikvand afshin takdastan 10.22034/ap.2023.1989523.1158 Open Access Article Abstract Page Full-Text 7 - Antibiotics, release routes, and their novel removal approaches from the aquatic environments Fateme Kargar Akram Bemani Mohammad Hoseein Sayadi Najmeh Ahmadpour 10.30495/wej.2023.31580.2378