Enhanced aerobic sludge granulation in sequencing batch reactor by Mg2+ augmentation.
Two sequencing batch reactors (SBRs) were concurrently operated to investigate the effect of Mg(2+) augmentation on aerobic granulation. Augmentation with 10mg/l Mg(2+) in R2 significantly decreased the sludge granulation (defined as that over 15% of granules were larger than 0.6mm) time from 32 days to 18 days, at the same time, the mean diameter of the granules in R2 was 2.9 mm after the granulation, which was consistently larger than that (1.8mm) in R1. Mg(2+)-fed granules were denser and more compact, showed better settling and had higher polysaccharide contents, but it did not result in a difference in microbial morphology. The results demonstrated that Mg(2+) enhanced the sludge granulation process in the sequencing batch reactor.
Li
Xiao-Ming
XM
College of Environmental Science and Engineering, Hunan University, Hunan Changsha 410082, China. xmli@hnu.cn
Liu
Qian-Qian
QQ
Yang
Qi
Q
Guo
Liang
L
Zeng
Guang-Ming
GM
Hu
Jin-Mei
JM
Zheng
Wei
W
D001420:Bacteria, Aerobic / Q000166:cytology* / Q000187:drug effects / Q000502:physiology*; D019149:Bioreactors / Q000382:microbiology*; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D008274:Magnesium / Q000008:administration & dosage*; D010316:Particle Size; D012722:Sewage / Q000382:microbiology*
D012722:Sewage; D008274:Magnesium