Denitrifying polyphosphate accumulating organisms population and nitrite reductase gene diversity shift in a DEPHANOX-type activated sludge system fed with municipal wastewater

2011 ◽  
Vol 111 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Ilias Zafiriadis ◽  
Spyridon Ntougias ◽  
Christos Nikolaidis ◽  
Anastasios G. Kapagiannidis ◽  
Alexander Aivasidis
Keyword(s):  
Activated Sludge ◽  
Nitrite Reductase ◽  
Municipal Wastewater ◽  
Gene Diversity ◽  
Activated Sludge System ◽  
Nitrite Reductase Gene ◽  
Reductase Gene ◽  
Polyphosphate Accumulating Organisms

Agricultural soil denitrifiers possess extensive nitrite reductase gene diversity

2017 ◽  
Vol 19 (3) ◽  
pp. 1189-1208 ◽  
Author(s):  
Sara Coyotzi ◽  
Andrew C. Doxey ◽  
Ian D. Clark ◽  
David R. Lapen ◽  
Philippe Van Cappellen ◽  
...  
Keyword(s):  
Nitrite Reductase ◽  
Agricultural Soil ◽  
Gene Diversity ◽  
Nitrite Reductase Gene ◽  
Reductase Gene

scholarly journals Salinity Decreases Nitrite Reductase Gene Diversity in Denitrifying Bacteria of Wastewater Treatment Systems

2004 ◽  
Vol 70 (5) ◽  
pp. 3152-3157 ◽  
Author(s):  
Sachiko Yoshie ◽  
Naohiro Noda ◽  
Satoshi Tsuneda ◽  
Akira Hirata ◽  
Yuhei Inamori
Keyword(s):  
Wastewater Treatment ◽  
Marine Bacteria ◽  
Nitrite Reductase ◽  
Gene Diversity ◽  
Denitrifying Bacteria ◽  
Treatment System ◽  
Saline Wastewater ◽  
Nitrite Reductase Gene ◽  
Reductase Gene ◽  
Wastewater Treatment Systems

ABSTRACT Investigation of the diversity of nirK and nirS in denitrifying bacteria revealed that salinity decreased the diversity in a nitrate-containing saline wastewater treatment system. The predominant nirS clone was related to nirS derived from marine bacteria, and the predominant nirK clone was related to nirK of the genus Alcaligenes.

Molecular Cloning and Characterization of Nitrite Reductase Gene from Sugarbeet

2011 ◽  
Vol 37 (8) ◽  
pp. 1406-1414
Author(s):  
Xiao-Yan SHI ◽  
Yan-Da ZENG ◽  
Shi-Long LI ◽  
Yu-Bo WANG ◽  
Feng-Ming MA ◽  
...  
Keyword(s):  
Molecular Cloning ◽  
Nitrite Reductase ◽  
Nitrite Reductase Gene ◽  
Reductase Gene

scholarly journals A novel nitrite reductase gene from the cyanobacterium Plectonema boryanum.

1995 ◽  
Vol 177 (21) ◽  
pp. 6137-6143 ◽  
Author(s):  
I Suzuki ◽  
H Kikuchi ◽  
S Nakanishi ◽  
Y Fujita ◽  
T Sugiyama ◽  
...  
Keyword(s):  
Nitrite Reductase ◽  
Plectonema Boryanum ◽  
Nitrite Reductase Gene ◽  
Reductase Gene

Treatment of municipal wastewater in a CIRCOX® airlift reactor with integrated denitrification

1997 ◽  
Vol 36 (1) ◽  
pp. 173-181 ◽  
Author(s):  
C. T. M. J. Frijters ◽  
D. H. Eikelboom ◽  
A. Mulder ◽  
R. Mulder
Keyword(s):  
Activated Sludge ◽  
Municipal Wastewater ◽  
Loading Rate ◽  
Airlift Reactor ◽  
Loading Rates ◽  
Activated Sludge System ◽  
Conversion Rates ◽  
Substrate Conversion ◽  
Airlift Pump ◽  
Interesting Alternative

In this study it was investigated whether the CIRCOX® airlift technology with integrated denitrification was suitable to treat municipal wastewater. The standard CIRCOX® reactor was extended with an anoxic compartment. The sludge on carrier is circulated alternately over the anoxic and oxic compartments by means of an airlift pump. The study was performed in two pilot reactors, a standard CIRCOX® reactor and a CIRCOX® reactor with integrated denitrification. Concerning BOD conversion and nitrification, no differences between the two systems were observed. It was shown that both BOD and nitrogen were removed efficiently. In the effluent, mean soluble BOD concentrations of 7 mg/l were attained at varying COD loading rates. Nitrification was complete in both reactors at temperatures above 15°C and at COD conversion rates of more than 2.5 kg COD/m3/d. Nitrification rates below 15°C were higher as compared to a low loaded activated sludge system. Substrate conversion rates were found to be constant throughout the denitrifying reactor. Denitrification matched the rates theoretically feasible. This could be achieved by controlling the recirculation and the aeration in relation to the loading rate. It can be concluded that the denitrifying CIRCOX® airlift technology seems to be an interesting alternative to treat municipal wastewater.

Sign in / Sign up

Export Citation Format

Share Document