Integrated Fixed-Film Activated Sludge (Ifas) Technology for WWTP Upgrades

Pehrson, Richard; McDowell, Curtis S.

doi:10.2175/193864702784164190

Cited by 1 publication

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“…Real estate and infrastructure constraints have led to a growing interest in integrated fixed-film activated sludge (IFAS) processes. Carriers used in IFAS systems have ranged from sponge cuboids to small, spherical particles to rope-type fabric (Jones et al, 1999;Muller, 1998;Ochoa et al, 2002;Pehrson and McDowell, 2002).…”

Section: Introductionmentioning

confidence: 99%

Oxygen Uptake Rate Tests to Evaluate Integrated Fixed Film Activated Sludge Processes

Maas¹,

Parker²,

Legge³

2008

Water Environment Research

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A modified oxygen uptake rate (OUR) test for characterizing the performance of integrated fixed-film activated sludge (IFAS) processes was developed while monitoring the startup of a full-scale demonstration facility. Data on total biofilm solids, in-basin nitrification rates, and batch nitrification rates were compared to the OUR test. The data was used to investigate dynamic changes in the physical and microbiological parameters during and after plant startup. Nitrification of the carriers was observed to follow different trends than the biofilm total solids during process startup. The process reached high nitrification rates within weeks, whereas the biofilm total solids required more than 50 days to attain a quasisteady-state. This study illustrated that parameters in addition to biofilm total solids are required to assess activity in nitrifying IFAS processes and oxygen uptake rates can be a useful tool in this regard. Water Environ. Res., 80, 2276Res., 80, (2008.

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Section: Introductionmentioning

confidence: 99%