Treatment of swine wastewater in aerobic granular reactors: comparison of different seed granules as factors
Lin LIU, Qiyu YOU, Valerie GIBSON, Xu HUANG, Shaohua CHEN, Zhilong YE, Chaoxiang LIU
Treatment of swine wastewater in aerobic granular reactors: comparison of different seed granules as factors
The granulation process, physic-chemical properties, pollution removal ability and bacterial communities of aerobic granules with different feed-wastewater (synthetic wastewater, R1; swine wastewater, R2), and the change trend of some parameters of two types of granules in long-term operated reactors treating swine wastewater were investigated in this experiment. The result indicated that aerobic granulation with the synthetic wastewater had a faster rate compared with swine wastewater and that full granulation in R1 and R2 was reached on the 30th day and 39th day, respectively. However, although the feed wastewater also had an obvious effect on the biomass fraction and extracellular polymeric substances of the aerobic granules during the granulation process, these properties remained at a similar level after long-term operation. Moreover, a similar increasing trend could also be observed in terms of the nitrogen removal efficiencies of the aerobic granules in both reactors, and the average specific removal rates of the organics and ammonia nitrogen at the steady-state stage were 35.33 mg·g−1 VSS and 51.46 mg·g−1 VSS for R1, and 35.47 mg·g−1 VSS and 51.72 mg·g−1 VSS for R2, respectively. In addition, a shift in the bacterial diversity occurred in the granulation process, whereas bacterial communities in the aerobic granular reactor were not affected by the seed granules after long-term operation.
aerobic granules / livestock wastewater / sequencing batch reactor / biological wastewater treatment / bacterial community
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