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Treatment of tapioca processing wastewater in a sequencing batch reactor: Mechanism of granule formation and
Hong Thi Bich Truong1, Phuoc Van Nguyen2, Phuong Thi Thanh Nguyen2
1Institute for Environment and Resources, Vietnam National University-Ho Chi Minh City, 142 To Hien Thanh Street, District 10, Ho Chi Minh City, 700000, Viet Nam; Department of Chemistry, Biology and Environment, Pham Van Dong University, 509 Phan Dinh Phung Street, Quang Ngai City, 570000, Viet Nam.
Abstract:
The formation of aerobic granular sludge was carried out in a sequencing batch reactor (SBR) for tapioca processing wastewater treatment. The effect of organic loading rates (OLRs) in the range of 2.5-10.0 kg COD m-3 day-1 on the granulation was investigated. The size and settleability of the aerobic granular sludge increased with increasing OLR from 2.5 to 7.5 kg COD m-3 day-1. The mature granules had an average size of 2.5 mm and good settleability with the sludge volume index (SVI) lower than 50 mL g-1. The granules had a layered structure consisting of anoxic sludge core with nematodes and an outer aerobic layer surrounded by stalked ciliates. Removal efficiencies of chemical oxygen demand (COD) and NH4+-N reached 90.0%-93.0% and 86.6%-92.5%, respectively. Simultaneous nitrification and denitrification at the OLR of 7.5 kg COD m-3 day-1 resulted in the improvement of total nitrogen (TN) removal efficiency to 66.1%.
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