Fixed-Film Activated Sludge Articles on Environmental XPRT

Ammonia Stripping And Integrated Fixed-Film Activated Sludge

The Keystone Sanitary Landfill (KSL) is located at the Keystone Industrial Park in Dunmore and Throop Boroughs, Pennsylvania. The 618 acre landfill site was originally permitted for 5,000 tons of trash per day, and recently received a permit to develop more cells to extend the operation for another 25 years at 5,000 tons per day. Landfill leachate, an inevitable by-product of landfilling, is ...

Jan. 1, 2005

Fate of selected pharmaceutically active compounds in the integrated fixed film activated sludge process

The potential for integrated fixed film activated sludge (IFAS) processes to achieve enhanced transformation of pharmaceuticals relative to conventional activated sludge (CAS) processes was assessed. Previous studies have focused on direct comparisons of parallel reactors with and without fixed film carriers and little information is available on the impacts of how varying operating parameters ...

Mar. 16, 2017

By IWA Publishing

Linking nitrification characteristic and microbial community structures in integrated fixed film activated sludge reactor by high-throughput sequencing

The primary goal of this study is to investigate ammonia removal, abundance of nitrifying bacteria and microbial community structures in a laboratory-scale integrated fixed film activated sludge (IFAS) reactor. The results of Illumina MiSeq sequencing based on 16S rRNA genes showed Proteobacteria and Bacteroidetes were the dominant phyla in both biofilm and suspended sludge ...

Jun. 24, 2016

By IWA Publishing

Conversion from Contact Stabilization to Nitrification using Integrated Fixed Film Activated Sludge (IFAS) in The Colony, Texas

ABSTRACT In early 2005, the City of The Colony, Texas, began construction of major modifications to its wastewater treatment plant to increase plant capacity and modify their existing contact stabilization basins. Due to the limitations of the existing process, the facility was not able to consistently nitrify ammonia. New ammonia limits of 3 mg/L wouldneed to be met in addition to ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Kinetics and Nitrifying Populations in Nitrogen Removal Processes at a Full-Scale Integrated Fixed Film Activated Sludge (IFAS) Plant

This study evaluated the nitrification rates and kinetics in an Integrated Fixed-Film Activated Sludge (IFAS) plant with two-stage nitrification process at Broomfield, CO. Batch tests were conducted at site with both fixed-film media and suspended mixed liquor from the two nitrification stages. The nitrification rates for mixed liquor only was 2.64 for stage 1 and 2.0 for stage 2 in unit of ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Understanding the contribution of biofilm in an integrated fixed-film-activated sludge system (IFAS) designed for nitrogen removal

The objective of this study is to improve knowledge on the integrated fixed-film-activated sludge (IFAS) system designed for nitrogen removal. Biofilm growth and its contribution to nitrification were monitored under various operating conditions in a semi-industrial pilot-scale plant. Nitrification rates were observed in biofilms developed on free-floating media and in activated sludge operated ...

May 18, 2015

By IWA Publishing

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

The combination of biofilm and suspended growth processes is, to date, relatively novel and there is a need to develop tools to monitor the performance of IFAS systems. The recent start-up of a full-scale demonstration Integrated Fixed Film Activated Sludge (IFAS) process in Ontario was monitored for approximately 100 days, providing an opportunity to investigate analytical tools to assess ...

Jan. 1, 2005

Application of cigarette filter rods as biofilm carrier in an integrated fixed-film activated sludge reactor

Bio-carriers are an important component of integrated fixed-film activated sludge (IFAS) processes. In this study, the capability of cigarette filter rods (CFRs) as a bio-carrier in IFAS processes was evaluated. Two similar laboratory-scale IFAS systems were operated over a 4-month period using Kaldnes-K3 and CFRs as IFAS media. The process performance was studied by using chemical oxygen demand ...

Apr. 11, 2013

By IWA Publishing

Questions and Answers About Integrated Fixed-Film/Activated Sludge (IFAS) in a BNR Pilot Plant

Integrated Fixed-film/Activated Sludge (IFAS) is an increasingly popular technology that promises to greatly improve the performance of activated sludge wastewater treatment systems. However, many questions remain about the fundamental behaviors and performance of these hybrid systems. Their future development will require a better understanding of the biokinetic behaviors and distribution of ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Two Year Case Study of Integrated Fixed Film Activated Sludge (IFAS) At Broomfield, Co WWTP

The City & County of Broomfield wastewater treatment plant secondary treatment processes were upgraded to a new biological nutrient removal process described as Integrated Fixed Film Activated Sludge (IFAS) back in 2003 using a moving bed plastic carrier element to help grow the biomass. This allows the existing aerobic reactors to maintain nitrification during year round operation while ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Eight Years of Successful Cold Weather Nitrification with Integrated Fixed-Film/Activated Sludge

In 1997 the North Buffalo Water Reclamation Facility in the City of Greensboro could not consistently meet their winter permit limit for ammonia-nitrogen. They decided to try a full scale demonstration of Integrated Fixed Film/Activated Sludge (IFAS) using a new fabric media called BioWeb. IFAS technology adds a high surface area synthetic media directly into the aeration basins of a conventional ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Demonstration Of An Integrated Fixed Film Activated Sludge (Ifas) System For Enhanced Nitrification Using A New Free Moving Media

Between October 1995 and June 1998, a study was conducted at the Waterdown STP to evaluate IFAS options for reducing the cost of retrofitting larger plants in the province of Ontario for year-round nitrification. Cord media options were evaluated first, but significant detractors to this approach were encountered such as worm growth and flow short circuiting. As a result, a free-floating plastic ...

Jun. 21, 2007

Integrated fixed-film activated sludge ANITA™Mox process – a new perspective for advanced nitrogen removal

ANITA™Mox is a Veolia process using moving-bed biofilm reactor (MBBR) technology tested and validated in full-scale for energy- and cost-effective autotrophic N-removal from sidestream effluent using anammox (ANaerobic AMMonium OXidation) bacteria. In order to increase the ANITA™Mox process performances under different operating conditions (e.g. mainstream and sidestream ...

Mar. 13, 2014

By IWA Publishing

Bio-augmentation of fixed film filters

Once regarded as the main process option for the waste water treatment for small communities, circular biological filters, so common on the outskirts of towns for many years, provided a reliable low cost and low profile method of treating household waste water. Quiet and robust, their simple engineering and structural design could be easily maintained by a daily visit from an operator, who, on ...

Nov. 1, 2008

By Greener Waste Technology

Environmental performance of an integrated fixed-film activated sludge (IFAS) reactor treating actual municipal wastewater during start-up phase

The present study summarizes the start-up performance and lessons learned during the start-up and optimization of a pilot-scale plant employing integrated fixed film activated sludge (IFAS) process treating actual municipal wastewater. A comprehensive start-up was tailored and implemented to cater for all the challenges and problems associated with start-up. After attaining desired suspended ...

Aug. 4, 2015

By IWA Publishing

A pilot-scale study on PVA gel beads based integrated fixed film activated sludge (IFAS) plant for municipal wastewater treatment

In the present study, a pilot-scale reactor incorporating polyvinyl alcohol gel beads as biomass carrier and operating in biological activated sludge mode (a combination of moving bed biofilm reactor (MBBR) and activated sludge) was investigated for the treatment of actual municipal wastewater. The results, during a monitoring period of 4 months, showed effective removal of chemical oxygen ...

Sep. 10, 2015

By IWA Publishing

Validating the Colloid model to optimise the design and operation of both moving-bed biofilm reactor and integrated fixed-film activated sludge systems

The paper presents a systematic study of simulations, using a previously calibrated Colloid model, from which it was found that: (i) for pure moving-bed biofilm reactor (MBBR) processes with tertiary nitrification conditions (no influent chemical oxygen demand (COD)), dissolved oxygen = 5 mg/L and residual NH4-N > 4 mgN/L, a nitrification rate of 1.2 gN/(m2d) was obtained ...

Apr. 10, 2014

By IWA Publishing

Enhancing nitrogen removal efficiency and reducing nitrate liquor recirculation ratio by improving simultaneous nitrification and denitrification in integrated fixed-film activated sludge (IFAS) process

An integrated fixed-film activated sludge (IFAS) process (G1) and an activated sludge anoxic–oxic process (G2) were operated at nitrate liquor recirculation ratio (R) of 100, 200 and 300% to investigate the feasibility of enhancing nitrogen removal efficiency (RTN) and reducing R by improving simultaneous nitrification and denitrification (SND) in the IFAS process. The results ...

Oct. 30, 2015

By IWA Publishing

Minimizing aerobic and post anoxic volume requirements in tertiary integrated fixed-film activated sludge (IFAS) and moving bed biofilm reactor (MBBR) systems using the aquifas model

Research was undertaken to calibrate and verify the Aquifas semi-empirical and biofilm 1D models against a full scale Integrated Fixed-Film Activated Sludge (IFAS) system. The model was then used to evaluate and identify alternatives to upgrade the performance of tertiary IFAS system and Moving (mobile) Bed Biofilm Reactor (MBBR) systems that could minimize volume required for nitrogen removal. ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Addressing digester foaming by fixing activated sludge system and gaining capacity in both

The City of Richland Wastewater Treatment Facility digesters have experienced Nocardiainduced digester foaming problems from the time they went into operation in 1985. Because of the persistent foam, most or all of the thickened waste activated sludge (TWAS) was often not sent to the digesters but directly to the belt filter press to be dewatered separately from the digested sludge. It was ...

Oct. 13, 2007

By Water Environment Federation (WEF)

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