مشخصات پژوهش

صفحه نخست /Evaluation of Autothermal ...
عنوان
Evaluation of Autothermal Thermophilic Aerobic Digester Performance for the Stabilization of Municipal Wastewater Sludge
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Sludge stabilization, ATAD system, organic compounds, municipal waste water, sludge
چکیده
Background and Objective: Sludge stabilization process in terms of operational, environmental and economic indexes is the most important stage of treatment and its disposal. This study was aimed to determine the performance of Autothermal Thermophilic Aerobic Digestion (ATAD) system as one of the low-cost and biocompatible methods of sludge treatment. Materials and Methods: This study has been done using a laboratory scale Autothermal Thermophilic Aerobic Digestion (ATAD). The reactor was consisted of two polyethylene tanks with a final capacity of 100 L for each tank. Both tanks with all fittings were installed on a metal frame. The variables of study were temperature, dissolved oxygen, pH, volatile organic compounds, total solids, COD and the number of Ascaris eggs and fecal coliforms per gram of dry matter of the sludge. The temperature was measured hourly and the pH and dissolved oxygen were measured and controlled twice per day. One-way ANNOVA was applied to analyze reasults. Results: According to the results, the temperature of sludge increased from 11.7-61.2EC by biological reactions. Pathogen organisms were reduced from 80×106 to 503 in number during 72 h. After 6 days pathogen organisms and Ascaris eggs were removed completely. Volatile organic compounds and COD were reduced 42 and 38.3% respectively during the 6 days. Conclusion: It is concluded that the performance of ATAD in removing organic compounds from wastewater sludge were desirable. Resulted sludge from stabilization process were appropriate for use in agriculture as a soil supplement and met the indexes of class A sludge according to EPA’s standards (CFR 40 Part 503).
پژوهشگران رضا شکوهی (نفر اول)، علیرضا رحمانی (نفر دوم)، قربان عسگری (نفر سوم)، عبداله درگاهی اودلو (نفر چهارم)، یاسر وزیری خوشمهر (نفر پنجم)، محمد عطارعباسی (نفر ششم به بعد)