Process design for nitrogen removal using nitrifying biofilm and denitrifying suspended growth in a Biofilm Airlift Suspension reactor

1997 ◽  
Vol 36 (1) ◽  
Keyword(s):  
Nitrogen Removal ◽  
Process Design ◽  
Suspended Growth

Process design for nitrogen removal using nitrifying biofilm and denitrifying suspended growth in a biofilm airlift suspension reactor

1997 ◽  
Vol 36 (1) ◽  
pp. 119-128 ◽  
Author(s):  
W. A. J. van Benthum ◽  
M. C. M. van Loosdrecht ◽  
J. J. Heijnen
Keyword(s):  
Nitrogen Removal ◽  
Process Design ◽  
Oxygen Depletion ◽  
Liquid Oxygen ◽  
Biofilm Growth ◽  
Reactor Configuration ◽  
Suspended Growth ◽  
Nitrogen Concentrations ◽  
Pre Treatment ◽  
Set Up

Operation of a Biofilm Airlift Suspension (BAS) reactor was possible with nitrifying biofilm growth and heterotrophic suspended growth, simultaneously converting ammonium and acetate. Control of the location of heterotrophic growth, either in suspension or in layers over the nitrifying biofilms, was established by manipulation of the hydraulic retention time. Two process configurations (based on the BAS reactor) are identified, for nitrogen removal from wastewater by integration of nitrification in biofilms and denitrification in suspension. The first set-up consists of a conventional nitrifying BAS reactor, coupled with a suspended biomass reactor (without biomass retention). The second process configuration is a single BAS reactor which is sequentially aerated and non-aerated, by cyclically recirculating the offgas. Process design schemes for these configurations are presented and the design aspects are evaluated. Three limiting processes are identified: gas-liquid oxygen transfer, the hydraulic capacity of the settler and the minimal time needed for oxygen depletion of the gas phase during offgas recirculation. It was found that the two-reactor configuration is mainly suitable for pre-treatment of concentrated ammonia containing wastewaters. The one-reactor configuration can be applied to obtain low nitrogen concentrations in the effluent.

Spatial distribution of ammonia-oxidizing bacteria in the biofilm and suspended growth biomass of the full- and partial-bed biological aerated filtersA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (11) ◽  
pp. 1859-1866 ◽  
Author(s):  
S. Fatihah ◽  
T. Donnelly
Keyword(s):  
Spatial Distribution ◽  
Nitrogen Removal ◽  
Environmental Engineering ◽  
Ammonia Oxidizing Bacteria ◽  
Removal Process ◽  
Suspended Growth

The extent of comparable nitrogen removal in the full- and partial-bed biological aerated reactors needs further microbiological evidence, specifically the existence of ammonia-oxidizing bacteria (AOB). The nitrogen removal process in such systems is typically initiated by chemoliautotrophic ammonia-oxidizing bacteria converting ammonia to nitrite and traces of oxidized nitrogen gases. The formation of a dense biofilm as a result of higher turbulence would account for the higher number of AOB cells enumerated in the biofilm samples from the partial-bed reactor (4.3 × 105 ± 1.9 × 105No. of AOB cells/mL sample) as compared with those from the full-bed reactor (1.5 × 105 ± 8.0 × 104No. of AOB cells/mL sample).

scholarly journals Advances in wastewater nitrogen removal by biological processes: state of the art review

2016 ◽  
Vol 11 (2) ◽  
pp. 250 ◽  
Author(s):  
Andrea G. Capodaglio ◽  
Petr Hlavínek ◽  
Massimo Raboni
Keyword(s):  
Nitrogen Removal ◽  
Process Design ◽  
State Of The Art ◽  
High Strength ◽  
Biological Processes ◽  
Digested Sludge ◽  
Biofilm Reactors ◽  
Technological Advances ◽  
Denitrification Reactor ◽  
Biological Nitrogen

The paper summarizes the state-of-the-art of the most recent advances in biological nitrogen removal, including process design criteria and technological innovations. With reference to the Modified Ludzck Ettinger (MLE) process (pre-denitrification and nitrification in the activated sludge process), the most common nitrogen removal process used nowadays, a new design equation for the denitrification reactor based on specific denitrification rate (SDNR) has been proposed. In addition, factors influencing SDNR (DO in the anoxic reactor; hydrodynamic behavior) are analyzed, and technological solutions are proposed. Concerning technological advances, the paper presents a summary of various “deammonification” processes, better known by their patent names like ANAMMOX®, DEMON®, CANON®, ANITA® and others. These processes have already found applications in the treatment of high-strength wastewater such as digested sludge liquor and landfill leachate. Among other emerging denitrification technologies, consideration is given to the Membrane Biofilm Reactors (MBfRs) that can be operated both in oxidation and reduction mode.

Operation of suspended-growth shortcut biological nitrogen removal (SSBNR) based on the minimum/maximum substrate concentration

2010 ◽  
Vol 44 (5) ◽  
pp. 1419-1428 ◽  
Author(s):  
Seongjun Park ◽  
Wookeun Bae ◽  
Bruce E. Rittmann ◽  
Seungjin Kim ◽  
Jinwook Chung
Keyword(s):  
Nitrogen Removal ◽  
Substrate Concentration ◽  
Biological Nitrogen Removal ◽  
Suspended Growth ◽  
Biological Nitrogen

A Hybrid Suspended Growth/RBC Nitrogen Removal Process At Wallingford, Connecticut

2009 ◽  
Vol 2009 (4) ◽  
pp. 1255-1276
Author(s):  
Kenneth A. Bradstreet ◽  
Terry Smith ◽  
Daniel Sullivan ◽  
Kim Maloney
Keyword(s):  
Nitrogen Removal ◽  
Removal Process ◽  
Suspended Growth
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