The aim of this study is to improve the aerotank efficiency using H2O2 and mechanical mixing to adjust dissolved oxygen content and aeration time. Two types of experiments were conducted: batch experiment and continuous flow experiment. In batch experiments, the H2O2 concentration was changed from 0 to 250 mg/L and aeration time was changed from 6 to 12 hours. The optimal concentration of H2O2 and optimal aeration time were 100 mg/L and 8 hours respectively. The oxygen uptake rate (OUR) was used for the evaluation of sludge activity. Continuous flow experiments were conducted to assess the effect of dissolved oxygen concentration on the treatment efficiency. The oxygen concentration varied with the aeration velocity and aeration method. The results show that the most appropriate aeration velocity for aerotank was 1 L/min. The effective aeration method was to supply the gas continuosly from the bottom of the tank. With the optimal operational conditions, the COD removal efficiency of the aerotank in this study was about 85%.
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. Liu I (1999). Environmental Engineers’ handbook. CRC Press LLC.
. Nguyen Ngoc Truc Ngan, Le Van Tuan, Pham Khac Lieu, Duong Van Hieu, Hoang Thi Nhu Ý, Le Thi Hoai Thuong, Shigeo Fujii, Truong Quy Tung (2015). Hydrogen peroside as an extrea oxygen sourse for activated slugde. Journal of Science and Technology 53 (3A), 97 - 102.
. Tay, J.H., Liu, Q.S., Liu, Y., (2004). The effect of upflow air velocity on the structure of aerobic granules cultivated in a sequencing batch reactor. Water Sci. Technol. 49 (11 - 12), 35-40.
. Houtmeyers, J. et al, (1977). Hydrogen Peroxide as a Supplemental Oxygen Source for Activated Sludge: Microbiological Investigations, European. J. Appl. Microbiol, 4, pp. 295-305.
. Tarasov A. L. et al, (2004). Utilization of H2O2 as the Oxygen Source by Bacteria of the Genera Pseudomonas and Rhodococcus. Microbiology, 73, 4, pp. 392-397.
. Barbusiński K. and Filipek K (2000). Aerobic Sludge Digestion in the Presence of Chemical Oxidizing Agents - Part I. Hydrogen Peroxide. Polish Journal of Environmental Studies, 9(3), pp. 139-143.
. Furukawa K., Lieu P.K., Tokitoh H., and Fujii T (2006). Development of single-stage nitrogen removal using anammox and partial nitritation (SNAP) and its treatment performance. Water Science & Technology 53 (6) pp. 83-90.
. APHA, AWWA, WEF (1999). Standard methods for the examination of water and wastewater. 20th edition, Washington DC, USA.
. Đỗ Khắc Uẩn, Văn Thị Thu Hà, Võ Thị Mỹ Hạnh (2013). Nghiên cứu ảnh hưởng của thời gian sục khí đến hiệu quả xử lý nước thải sinh hoạt bằng công nghệ SBR. Tạp chí khoa học và công nghệ ĐH Đà Nẵng, Số 10 (71).
. Pham Khac Lieu, Hoang Thi My Hang, Ton That Huu Dat (2013). Performance of H202 - assisted submerged aerates biofilter of landfill leachate treatment. Journal of Science and Teachnology, 51 (3B), 28 - 34.
. A.S. Smoljanichenko (2010). Improving the efficiency of the aeration process in biological wastewater treatment. Izvestija Proceedings of Rostov State University of Civil Engineering. 14 321 - 322.