scholarly journals Analyzing the roles of cyclic dimeric guanosine monophosphate (c-di-GMP) on the formation of autotrophic granules and autotrophic biofilm in integrated fixed-film activated sludge (IFAS) reactor

2022 ◽  
pp. 102304
Author(s):  
Kai Zhang ◽  
Jun Li ◽  
Jing Zhang ◽  
Zhaoming Zheng ◽  
Mengxia Sun
Keyword(s):  
Activated Sludge ◽  
Guanosine Monophosphate ◽  
Fixed Film

Dynamic modeling of nitrogen removal for a three-stage integrated fixed-film activated sludge process treating municipal wastewater

2017 ◽  
Vol 41 (2) ◽  
pp. 237-247 ◽  
Author(s):  
Paul Moretti ◽  
Jean-Marc Choubert ◽  
Jean-Pierre Canler ◽  
Pierre Buffière ◽  
Olivier Pétrimaux ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Dynamic Modeling ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Activated Sludge Process ◽  
Fixed Film

Shelter From The Storm: Integrated Fixed Film Activated Sludge Protects Nitrifiers From Toxic Upsets

2010 ◽  
Vol 2010 (17) ◽  
pp. 679-685 ◽  
Author(s):  
Hyun-su Kim ◽  
Claudia Gunsch ◽  
J. Gellner ◽  
J. Boltz ◽  
Robert G. Freudenberg ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Fixed Film

Enhancing the stability and efficiency of the anammox process in plug-flow integrated fixed-film activated sludge (IFAS) reactors through alternating anoxic/aerobic (A3) conditions

2019 ◽  
Vol 5 (6) ◽  
pp. 1102-1112
Author(s):  
Chao Liu ◽  
Wenlong Liu ◽  
Lei Wu ◽  
Yongzhen Peng
Keyword(s):  
Activated Sludge ◽  
Plug Flow ◽  
Fixed Film ◽  
The Stability ◽  
Anammox Process

The breakthrough of this study was the development of plug-flow integrated fixed-film activated sludge (IFAS) reactors operated with alternating anoxic/aerobic (A3) conditions for enhanced anammox processes.

Full-scale evaluation of an integrated fixed-film activated sludge (IFAS) process for enhanced nitrogen removal

1996 ◽  
Vol 33 (12) ◽  
pp. 155-162 ◽  
Author(s):  
Clifford W. Randall ◽  
Dipankar Sen
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Plug Flow ◽  
Treatment Plant ◽  
Nitrification Rate ◽  
A Value ◽  
Fixed Film ◽  
Control Section ◽  
The Media ◽  
Retrofit Design

One of the two trains of the 37,000 m3/d Annapolis, Maryland step aeration activated sludge treatment plant was modified for single-sludge anoxic-aerobic operation, and then fixed-film media were integrated into the aerobic zone to enhance nitrification. Rope-like Ringlace media was selected for integration, and 30,000 meters were installed in a volume of 475 m3 for a pilot demonstration. The purpose of the integrated fixed-film media was to upgrade the short hydraulic retention time (HRT) basin (6 hrs nominal) for efficient, year-round nitrogen removal without construction to increase basin volume. An engineering study had concluded that upgrading the facility for year round complete nitrification, without nitrogen removal, would cost US$24 million. The modified train was operated for 12 months, six in the plug-flow MLE configuration, and six in a step-feed configuration. The integrated Ringlace media increased the nitrification rate per unit volume to 225% of that observed in the control section, attaining a value of 1.75 kg/d NH3-N per linear meter at 15°C. The media also increased denitrification in the aerobic media section to the extent that between 30 and 88% of the nitrates formed in the section were denitrified within it, permitting a potential 25% or more reduction in the volume of the anoxic zone. An IFAS retrofit design was developed which incorporated step-feed operation, and reduced the projected construction cost to US$9.2 million.

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