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A pilot scale experiment was carried out in tertiary wastewater treatment using hydraulic automatic floating filter. The hydraulic automatic floating media filter has been working with 120 cm depth of polystyrene bed. Wastewater from secondary biological treatment of WWTP was treated in the pilot filter with filtration velocity of 4 m/h. | Vietnam Journal of Science and Technology 55 (4C) (2017) 291-296 ADVANCED WASTEWATER TREATMENT BY HYDRAULIC AUTOMATIC FLOATING MEDIA FILTER Tran Thanh Son*, Pham Van Duong Hanoi Architectural University. Department of Water Supply and Sewerage. km 10, Nguyen Trai street, Thanh Xuan district, Ha Noi city, Viet Nam * Email:shonlaanh@yahoo.com Received: 30 June 2017; Accepted for publication: 17 October 2017 ABSTRACT A pilot scale experiment was carried out in tertiary wastewater treatment using hydraulic automatic floating filter. The hydraulic automatic floating media filter has been working with 120 cm depth of polystyrene bed. Wastewater from secondary biological treatment of WWTP was treated in the pilot filter with filtration velocity of 4 m/h. Oxygen concentration was remained constantly at level 2.0 mg/l by using an ejector. Headloss development and evaluation of SS, COD, NH4+ removals during filtration were objectives of the study. The experiment results showed that concentrations of SS, COD and NH4+ in effluent wastewater were kept lower than 5 mg/l, 30 and 0.5 mg/l respectively for almost filtration cycle. Effects of treatment in SS, COD and NH4+ were 88.27 %, 68.54 % and 5.59 %, respectively. Keywords: headloss, COD removal, SS removal, NH4+ removal, hydraulic automatic floating media filter. 1. INTRODUCTION Primary and secondary wastewater treatment is able to remove the majority of organic substances (BOD) and Suspended Solids (SS). However, in many cases this level of wastewater treatment does not meet National Technical Regulation of wastewater discharge. Thus, additional treatment steps have been implemented to wastewater treatment plant (WWTP) for further removal of organic substances and solids or nutrient and/ or toxic substances [1]. In this concept, filtration facility is used as tertiary treatment. In advanced wastewater treatment, rapid sand filters are widely used for removal of organic substances (BOD) and suspended solids (SS) [2]. .
