Search results for " Hybrid reactors"

showing 3 items of 3 documents

Hybrid activated sludge/biofilm process for the treatment of municipal wastewater in a cold climate region: a case study.

2011

A hybrid activated sludge/biofilm process was investigated for wastewater treatment in a cold climate region. This process, which contains both suspended biomass and biofilm, usually referred as IFAS process, is created by introducing plastic elements as biofilm carrier media into a conventional activated sludge reactor. In the present study, a hybrid process, composed of an activated sludge and a moving bed biofilm reactor was used. The aim of this paper has been to investigate the performances of a hybrid process, and in particular to gain insight the nitrification process, when operated at relatively low MLSS SRT and low temperatures. The results of a pilot-scale study carried out at the…

Environmental EngineeringWaste managementSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleSewageMoving bed biofilm reactorNorwayBiomassPilot ProjectsCold ClimateWaste Disposal FluidMixed liquor suspended solidsQuaternary Ammonium CompoundsActivated sludgePilot plantWastewaterBiofilmsActivated sludge Biofilm Hybrid reactors MBBR Nitrification Wastewater treatmentEnvironmental scienceNitrificationSewage treatmentWater Pollutants ChemicalWater Science and TechnologyWater science and technology : a journal of the International Association on Water Pollution Research
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MUNICIPAL WASTEWATER TREATMENT IN A HYBRID ACTIVATED SLUDGE BIOFILM REACTOR: A PILOT PLANT EXPERIENCE

2008

A hybrid activated sludge/biofilm process (IFAS) was investigated. This process which contains both suspended and attached biomass, is created by introducing plastic elements as biofilm carriers material into a classical activated sludge system. This process is suitable for upgrading existing activated sludge wastewater treatment plants which are no longer able to comply with the effluent standards, and in particular in those cases where the existing plant does not nitrify or only nitrify during summer. However, the IFAS processes are relatively new and there are still uncertainties with respect to their design. A main task is to find a rational approach to the design of nitrification in hy…

Wastewater treatment Activated sludge Hybrid reactors Biofilm Nitrification
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Influence of operative conditions in a hybrid activated sludge/biofilm process for the treatment of municipal wastewater in a cold climate region: a …

2012

In the last years the idea to combine suspended and attached bomass by introducing suspended carriers into the aeration tank for biofilm attachment and growth was proposed. The increase of the overall sludge age in the system leads to a favourable environment for the growth of nitrifying bacteria, so that nitrification may be maintained throughout the winter. The main aim of the study was to investigate a hybrid MBBR process, mostly in terms of nitrification, when operating with different values of the sludge retention time (SRT), and highlighting the influence of temperature on the process. Based on experience in practice it was hypothesized that nitrification could be maintained at far lo…

Settore ICAR/03 - Ingegneria Sanitaria-AmbientaleBiofilm Hybrid reactors MBBR Nitrification Wastewater treatment
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