Rapid aerobic granulation in an SBR treating piggery wastewater by seeding sludge from a municipal WWTP |
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| Authors: | Jun Liu Jun Li Xiaodong Wang Qi Zhang Helen Littleton |
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| Institution: | 1 College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;2 College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China;3 Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China;4 WEF Municipal WWT Design Committee, Richboro, PA 18954, USA |
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| Abstract: | Aerobic sludge granulation was rapidly obtained in the erlenmeyer bottle and sequencing batch reactor (SBR) using piggery wastewater. Aerobic granulation occurred on day 3 and granules with mean diameter of 0.2 mm and SVI30 of 20.3 mL/g formed in SBR on day 18. High concentrations of Ca and Fe in the raw piggery wastewater and operating mode accelerated aerobic granulation, even though the seed sludge was from a municipal wastewater treatment plant (WWTP). Alpha diversity analysis revealed Operational Taxonomic Units, Shannon, ACE and Chao 1 indexes in aerobic granules were 2013, 5.51, 4665.5 and 3734.5, which were obviously lower compared to seed sludge. The percentages of major microbial communities, such as Proteobacteria, Bacteroidetes and Firmicutes were obviously higher in aerobic granules than seed sludge. Chloroflexi, Planctomycetes, Actinobacteria, TM7 and Acidobacteria showed much higher abundances in the inoculum. The main reasons might be the characteristics of raw piggery wastewater and granule structure. |
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| Keywords: | Rapid aerobic granulation Piggery wastewater Microbial community Granular structure |
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