Rapid Start-Up of the Aerobic Granular Reactor under Low Temperature and the Nutriment Removal Performance of Granules with Different Particle Sizes

The start-up of the aerobic granular sludge (AGS) process under low temperature is challenging. In this study, the sequencing batch reactor (SBR) was fed with synthetic wastewater and the temperature was controlled at 15 ℃. The main components in the synthetic wastewater were sodium acetate and ammo...

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Published inWater (Basel) Vol. 13; no. 24; p. 3590
Main Authors Liang, Dongbo, Li, Jun, Zheng, Zhaoming, Zhang, Jing, Wu, Yaodong, Li, Dongyue, Li, Peilin, Zhang, Kai
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2021
Subjects
Acetic acid
aerobic granules
Ammonium
Ammonium chloride
Bacteria
Batch reactors
Chemical oxygen demand
different particle size
Effluents
Experiments
Granular materials
Low temperature
mainstream wastewater
Microorganisms
Nitrogen
Nitrogen dioxide
Nutrient removal
Reactors
Sedimentation & deposition
Sludge
sludge characteristics
Sodium acetate
Trace elements
Wastewater treatment
Water treatment
China
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Summary:The start-up of the aerobic granular sludge (AGS) process under low temperature is challenging. In this study, the sequencing batch reactor (SBR) was fed with synthetic wastewater and the temperature was controlled at 15 ℃. The main components in the synthetic wastewater were sodium acetate and ammonium chloride. The influent chemical oxygen demand (COD) and NH4+-N concentrations were 300 and 60 mg/L, respectively. The AGS was successfully cultivated in 60 days by gradually shortening the settling time. During the stable operation stage (61–100 d), the average effluent COD, NH4+-N, NO2−-N, and NO3−-N concentrations were 47.2, 1.0, 47.2, and 5.1 mg/L, respectively. Meanwhile, the nitrite accumulation rate (NAR) reached 90.6%. Batch test showed that the smaller AGS had higher NH4+-N removal rate while the larger AGS performed higher NAR. The NH4+-N removal rates of R1 (1.0–2.0 mm), R2 (2.0–3.0 mm), and R3 (>3 mm) granules were 0.85, 0.61, and 0.45 g N/(kg VSS·h), respectively. Meanwhile, the NAR of R1, R2, and R3 were 36.2%, 77.2%, and 94.9%, respectively. The obtained results could provide important guidance for the cultivation of AGS in low-temperature wastewater treatment.
ISSN:2073-4441
2073-4441
DOI:10.3390/w13243590