Details

Autor(en) / Beteiligte

• Truong, Hong Thi Bich
• Nguyen, Phuoc Van
• Nguyen, Phuong Thi Thanh
• Bui, Ha Manh

Titel

Treatment of tapioca processing wastewater in a sequencing batch reactor: Mechanism of granule formation and performance

Ist Teil von

• Journal of environmental management, 2018-07, Vol.218, p.39-49

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• 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%. [Display omitted] •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.