An evaluation of the performance and optimization of a new wastewater treatment technology: the air suction flow-biofilm reactor
MetadataShow full item record
This item's downloads: 149 (view details)
Cited 4 times in Scopus (view citations)
Forde, P., Kennelly, C., Gerrity, S., Collins, G., & Clifford, Eoghan. (2015). An evaluation of the performance and optimization of a new wastewater treatment technology: the air suction flow-biofilm reactor. Environmental Technology, 36(9), 1188-1204. doi: 10.1080/09593330.2014.982724
In this laboratory study, a novel wastewater treatment technology, the air suction flow-biofilm reactor (ASF-BR) - a sequencing batch biofilm reactor technology with a passive aeration mechanism - was investigated for its efficiency in removing organic carbon, nitrogen and phosphorus, from high-strength synthetic wastewaters. A laboratory-scale ASF-BR comprising 2 reactors, 350 mm in diameter and 450 mm in height, was investigated over 2 studies (Studies 1 and 2) for a total of 430 days. Study 1 lasted a total of 166 days and involved a 9-step sequence alternating between aeration, anoxic treatment and settlement. The cycle time was 12.1 h and the reactors were operated at a substrate loading rate of 3.60 g filtered chemical oxygen demand (CODf)/m(2) media/d, 0.28 g filtered total nitrogen (TNf)/m(2) media/d, 0.24 g ammonium-nitrogen (NH4-N)/m(2) media/d and 0.07 g ortho-phosphate (PO4-P)/m(2) media/d. The average removal rates achieved during Study 1 were 98% CODf, 88% TNf, 97% NH4-N and 35% PO4-P. During Study 2 (264 days), the unit was operated at a loading rate of 2.49 g CODf/m(2) media/d, 0.24 g TNf/m(2) media/d, 0.20 g NH4-N/m(2) media/d and 0.06 PO4-P/m(2) media/d. The energy requirement during this study was reduced by modifying the treatment cycle in include fewer pumping cycles. Removal rates in Study 2 averaged 97% CODf, 86% TNf, 99% NH4-N and 76% PO4-P. The excess sludge production of the system was evaluated and detailed analyses of the treatment cycles were carried out. Biomass yields were estimated at 0.09 g SS/g CODf, removed and 0.21 g SS/g CODf, removed for Studies 1 and 2, respectively. Gene analysis showed that the use of a partial vacuum did not affect the growth of ammonia-oxidizing bacteria. The results indicate that the ASF-BR and passive aeration technologies can offer efficient alternatives to existing technologies.
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. Please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.
The following license files are associated with this item: