Journal
HELIYON
Volume 5, Issue 12, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.heliyon.2019.e03023
Keywords
Bioengineering; Environmental chemistry; Environmental engineering; Microbiology; Aerobic granular sludge; Dry storage; Stability loss; Microbial community; Recovery
Categories
Funding
- Natural Science Foundation of Science and Technology Department of Jiangxi Province [20181BAB216026]
- National Innovation and Entrepreneurship Training Program for College Students [201810407005]
- Opening Project of Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology [CJSP2018001]
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Aerobic granular sludge (AGS) was imbedded in agar and stored at 4 degrees C for 30 days, and then the stored granules were recovered in a sequencing batch reactor fed real wastewater within 11 days. Variations in microbial community compositions were investigated during dry storage and recovery of AGS, aiming to elucidate the mechanism of granular stability loss and recovery. The storage and recovery of AGS involved microbial community evolution. The dominant bacterial genera of the mature AGS were Zoogloea (relative abundance of 22.39%), Thauera (16.03%) and Clostridium_sensu_stricto (11.17%), and those of the stored granules were Acidovorax (26.79%), Macellibacteroides (12.83%) and Pseudoxanthomonas (5.69%), respectively. However, the dominant genera were Streptococcus (43.64%), Clostridium_sensu_stricto (12.3.6%) and Lactococcus (11.47%) in the recovered AGS. Methanogens were always the dominant archaeal species in mature AGS (93.01%), stored granules (99.99%) and the recovered AGS (94.84%). Facultative anaerobes and anaerobes proliferated and dominated in the stored granules, and their metabolic activities gradually led to granular structure destruction and property deterioration. However, the stored granules served as carriers for the microbes originated from the real septic tank wastewater during recovery. They proliferated rapidly and secreted a large number of extracellular polymeric substances which helped to recover the granular structure in 11 days.
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