การศึกษาระยะเวลาที่เหมาะสมในการบำบัดน้ำเสียด้วยวิธีถังกรองไร้อากาศ

Abstract

This experimental research that aims to study and find the suitable hydraulic retention time for wastewater  treatment using anaerobic filter tank. The experiment was constructing a wastewater treatment tank which calculated from BOD - loading of filter media and used wastewater from the cookhouse of Navaminda Kasatriyadhiraj Royal Air Force Academy with BOD 400-500 milliliters/liter, set the flow rate with 150 liters/day, used the beer tank shape intermediary filter that surface area of ​​170 square meters/cubic meter with the BOD-Loading removal rate = 0.63 kg-BOD/m²/d. The hydraulic retention times were 29, 30, 31 and 32 hours, respectively.The results showed that: the hydraulic retention time of 29 hours resulted in BOD-removal = 63%, the hydraulic retention time of 30 hours resulted in BOD-removal = 66%, the hydraulic retention time of 31 hours resulted in BOD-removal = 70% and the hydraulic retention time of 32 hours resulted in BOD-removal = 72%. The most suitable hydraulic retention time for wastewater treatment using anaerobic filter tank was the retention time of 31 hours because BOD-removal = 70% and pH = 7.17, although the retention time was increased to 32 hours, the percentage of BOD-removal increases only 2%, so it not worth with the budget and increased hydraulic retention time. The results of this research was the data for the suitable size design of anaerobic filter tank which causes the cost of wastewater treatment to be reduced.