Application of a novel backwashing process in upflow biological aerated filter
Jinshui Yang , Weijie Liu , Baozhen Li , Hongli Yuan , Meiping Tong , Jinsong Gao
DOI:
Received May 05, 2009,Revised October 22, 2009, Accepted , Available online
Volume 22,2010,Pages 362-366
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To improve the e ciency of backwashing in upflow biological aerated filter (BAF), a novel backwashing process named air-water
siphon backwashing (AWSB) was proposed and applied on laboratory scale. The e ects of backwashing on turbidity and suspended
solid (SS) in backwashing e uent using this new backwashing process were compared with those of traditional backwashing process,
namely air-water backwashing (AWB). In AWB, the turbidity of backwashing e uent maintained 100 NUT when consumed 60 min
and 10.5 L water. However, in AWSB, it declined to 44 NUT, consumed 40 min, and 7 L water. The COD removal of BAF after
backwashing was also analyzed. The average removal rate of COD in the reactor backwashed by AWB and AWSB was 89.34% and
90.91%, respectively. Compared with AWB, the backwashing interval had been prolonged 35%. The volume of backwashing water in
that AWSB was only 66.7% of that in AWB. The results demonstrated that AWSB required less water and took shorter backwashing
time relative to AWB to achieve the same turbidity of backwashing e uent, and AWSB was more e ective in removing fouling than
that of AWB. More significant advantage of AWSB was that the backwashing interval was e ectively prolonged.
