Aquatic environment

Application of a novel backwashing process in upflow biological aerated filter

Jinshui Yang , Weijie Liu , Baozhen Li , Hongli Yuan , Meiping Tong , Jinsong Gao


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.

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