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| Reactivation of aerobic granular sludge cultivated by low-strength wastewater after room-temperature storage |
| ZOU Jin-te1, HE Hang-tian2, PAN Ji-yang2, TAO Ya-qiang2, LI Jun1 |
1. Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;
2. College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China |
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Abstract To investigate the feasibility of room-temperature storage of aerobic granular sludge (AGS) cultivated by real and low-strength wastewater, the variations of AGS characteristics, specific oxygen uptake rate (SOUR), removal efficiency and microbial community were explored. The experimental results show that after 60days storage using tap water at room-temperature, the structure of AGS was still intact and did not disintegrate obviously. The mixed liquor suspended solids (MLSS) slightly decreased from 4960mg/L to 4740mg/L, but the settling property maintained well (SVI:24.2mL/g). The decrease in SOUR was very slight (16%), especially for the SOUR of nitrifying bacteria. The abundance of microbial community changed at the phylum and genus level. After restarting the reactor, AGS morphology recovered quickly and the granule size increased after long-term operation (200~250μm). The sludge settling property has always maintained well (SVI<20mL/g), and the SOUR recovered soon after 20days operation. The COD removal efficiency was completely recovered after 11days operation (around 53mg/L in the effluent). The NH4+-N removal efficiency was also completely recovered after 5 days operation (around 0.7mg/L in the effluent). AGS storage at room-temperature has significant value in practical application due to its convenient operation and fast recovery of reactor stable operation.
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Received: 24 April 2018
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