Treatment of tapioca processing wastewater in a sequencing batch reactor: Mechanism of granule formation and performance. (15th July 2018)

• Record Type: Journal Article
• Authors: Truong, Hong Thi Bich; Nguyen, Phuoc Van; Nguyen, Phuong Thi Thanh; Bui, Ha Manh
• Is Part Of: Journal of environmental management. Volume 218(2018)
• Page Start: 39
• Page End: 49
• Publication Date: 2018-07-15
• Subjects: Aerobic granular sludge -- Granulation -- Sequencing batch reactor -- Tapioca processing wastewater; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.04.041
• Languages: English
• ISSNs: 0301-4797

Abstract

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%. Graphical abstract: Image 1 Highlights: The mature granules had average size of 2.5 mm, sludge volume index around 50 mL g −1 . The granule structure consisted of anoxic core and outer aerobic layer. Chemical oxygen demand removal efficiency was 90–93%. Nitrification and denitrification occurred simultaneously in the reactor. NH4 + -N and total nitrogen removal efficiencies were 86.6–92.5%, 49.7–66.1%, respectively.