scholarly journals Ammonia-Oxidizing Archaea (AOA) Play with Ammonia-Oxidizing Bacteria (AOB) in Nitrogen Removal from Wastewater

Archaea ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Zhixuan Yin ◽  
Xuejun Bi ◽  
Chenlu Xu
Keyword(s):  
Nitrogen Removal ◽  
Current Knowledge ◽  
Ammonia Oxidizing Bacteria ◽  
Low Oxygen ◽  
Factors Affecting ◽  
Future Studies ◽  
Ammonia Oxidizing Archaea ◽  
Removal Processes ◽  
Number Of Publications ◽  
Wastewater Treatment Systems

An increase in the number of publications in recent years indicates that besides ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA) may play an important role in nitrogen removal from wastewater, gaining wide attention in the wastewater engineering field. This paper reviews the current knowledge on AOA and AOB involved in wastewater treatment systems and summarises the environmental factors affecting AOA and AOB. Current findings reveal that AOA have stronger environmental adaptability compared with AOB under extreme environmental conditions (such as low temperature and low oxygen level). However, there is still little information on the cooperation and competition relationship between AOA and AOB, and other microbes related to nitrogen removal, which needs further exploration. Furthermore, future studies are proposed to develop novel nitrogen removal processes dominated by AOA by parameter optimization.

scholarly journals Overlooked nitrogen-cycling microorganisms in biological wastewater treatment

2021 ◽  
Vol 15 (6) ◽  
Author(s):  
Shaoyi Xu ◽  
Xiaolong Wu ◽  
Huijie Lu
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Cycling ◽  
Nitrogen Removal ◽  
Ammonia Oxidation ◽  
Current Knowledge ◽  
N Cycling ◽  
Anammox Bacteria ◽  
Kinetic Properties ◽  
Ammonia Oxidizing Bacteria ◽  
Removal Processes

AbstractNitrogen-cycling microorganisms play key roles at the intersection of microbiology and wastewater engineering. In addition to the well-studied ammonia oxidizing bacteria, nitrite oxidizing bacteria, heterotrophic denitrifiers, and anammox bacteria, there are some other N-cycling microorganisms that are less abundant but functionally important in wastewater nitrogen removal. These microbes include, but not limited to ammonia oxidizing archaea (AOA), complete ammonia oxidation (comammox) bacteria, dissimilatory nitrate reduction to ammonia (DNRA) bacteria, and nitrate/nitrite-dependent anaerobic methane oxidizing (NOx-DAMO) microorganisms. In the past decade, the development of high-throughput molecular technologies has enabled the detection, quantification, and characterization of these minor populations. The aim of this review is therefore to synthesize the current knowledge on the distribution, ecological niche, and kinetic properties of these “overlooked” N-cycling microbes at wastewater treatment plants. Their potential applications in novel wastewater nitrogen removal processes are also discussed. A comprehensive understanding of these overlooked N-cycling microbes from microbiology, ecology, and engineering perspectives will facilitate the design and operation of more efficient and sustainable biological nitrogen removal processes.

scholarly journals The survival and dispersal of Taenia eggs in the environment: what are the implications for transmission? A systematic review

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Famke Jansen ◽  
Pierre Dorny ◽  
Sarah Gabriël ◽  
Veronique Dermauw ◽  
Maria Vang Johansen ◽  
...  
Keyword(s):  
Systematic Review ◽  
Current Knowledge ◽  
Intermediate Hosts ◽  
Egg Survival ◽  
Future Studies ◽  
Bovine Cysticercosis ◽  
Factors Influencing ◽  
Geographical Regions ◽  
Route Of Transmission ◽  
Wastewater Treatment Systems

AbstractTaenia spp. are responsible for a substantial health and economic burden in affected populations. Knowledge of the fate of the eggs of Taenia spp. in the environment and of other factors facilitating the transmission of eggs to intermediate hosts is important for the control/elimination of infections caused by Taenia spp. The aim of this systematic review was to summarize current knowledge of the factors influencing the survival and dispersal of Taenia spp. eggs in the environment. Publications retrieved from international databases were systematically reviewed. Of the 1465 papers initially identified, data were ultimately extracted from 93 papers. The results of this systematic review indicate that survival is favoured at moderate temperatures (0–20 °C). Humidity seems to affect the survival of Taenia spp. eggs more than temperature. Under field circumstances, Taenia spp. eggs have been found to survive for up to 1 year. Taenia spp. eggs are commonly found on vegetables (0.9–30%) and in soil and water samples (0–43%), with their presence posing a risk to the consumer. Invertebrates may act as transport hosts, transferring the infection to an intermediate host, but the importance of this route of transmission is still open to question. Wastewater treatment systems are not capable of entirely eliminating Taenia spp. eggs. Access to surface water and the use of sewage sludge as fertilizer on pastures are important risk factors for bovine cysticercosis. Although information on the survival and spread of Taenia spp. eggs is available, in general the data retrieved and reviewed in this article were old, focused on very specific geographical regions and may not be relevant for other areas or not specific for different Taenia spp. Furthermore, it is unknown whether egg survival differs according to Taenia sp. Future studies are necessary to identify sustainable methods to identify and inactivate parasite eggs in the environment and reduce their spread.

scholarly journals Spatial Distribution and Factors Shaping the Niche Segregation of Ammonia-Oxidizing Microorganisms in the Qiantang River, China

2013 ◽  
Vol 79 (13) ◽  
pp. 4065-4071 ◽  
Author(s):  
Shuai Liu ◽  
Lidong Shen ◽  
Liping Lou ◽  
Guangming Tian ◽  
Ping Zheng ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Organic Carbon ◽  
Ammonia Oxidation ◽  
Current Knowledge ◽  
Organic Carbon Content ◽  
Ammonia Oxidizing Bacteria ◽  
Niche Segregation ◽  
Qiantang River ◽  
Ammonia Oxidizing Archaea ◽  
Microbial Groups

ABSTRACTAmmonia oxidation is performed by both ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB). However, the current knowledge of the distribution, diversity, and relative abundance of these two microbial groups in freshwater sediments is insufficient. We examined the spatial distribution and analyzed the possible factors leading to the niche segregation of AOA and AOB in the sediments of the Qiantang River, using clone library construction and quantitative PCR for both archaeal and bacterialamoAgenes. pH and NH4+-N content had a significant effect on AOA abundance and AOA operational taxonomy unit (OTU) numbers. pH and organic carbon content influenced the ratio of AOA/AOB OTU numbers significantly. The influence of these factors showed an obvious spatial trend along the Qiantang River. This result suggested that AOA may contribute more than AOB to the upstream reaches of the Qiantang River, where the pH is lower and the organic carbon and NH4+-N contents are higher, but AOB were the principal driver of nitrification downstream, where the opposite environmental conditions were present.

scholarly journals A Review of Ammonia-Oxidizing Archaea and Anaerobic Ammonia-Oxidizing Bacteria in the Aquaculture Pond Environment in China

2021 ◽  
Vol 12 ◽  
Author(s):  
Shimin Lu ◽  
Xingguo Liu ◽  
Chong Liu ◽  
Guofeng Cheng ◽  
Runfeng Zhou ◽  
...  
Keyword(s):  
Water Treatment ◽  
Nitrogen Removal ◽  
Pond Water ◽  
Ammonia Oxidizing Bacteria ◽  
Pond Aquaculture ◽  
Environmentally Sustainable ◽  
Aquaculture Pond ◽  
Ammonia Oxidizing Archaea ◽  
Aquaculture Water ◽  
Sediment Layers

The excessive ammonia produced in pond aquaculture processes cannot be ignored. In this review, we present the distribution and diversity of ammonia-oxidizing archaea (AOA) and anaerobic ammonia-oxidizing bacteria (AnAOB) in the pond environment. Combined with environmental conditions, we analyze the advantages of AOA and AnAOB in aquaculture water treatment and discuss the current situation of pond water treatment engineering involving these microbes. AOA and AnAOB play an important role in the nitrogen removal process of aquaculture pond water, especially in seasonal low temperatures and anoxic sediment layers. Finally, we prospect the application of bioreactors to purify pond aquaculture water using AOA and AnAOB, in autotrophic nitrogen removal, which can reduce the production of greenhouse gases (such as nitrous oxide) and is conducive to the development of environmentally sustainable pond aquaculture.

Numerical modeling of nitrogen removal processes in biofilters with simultaneous nitritation and anammox

2013 ◽  
Vol 67 (3) ◽  
pp. 549-556
Author(s):  
Shun Shi ◽  
Wendong Tao
Keyword(s):  
Nitrogen Removal ◽  
Ammonium Concentration ◽  
Ammonia Oxidizing Bacteria ◽  
Ammonium Oxidation ◽  
Nitrite Oxidation ◽  
Ammonium Removal ◽  
Natural Treatment Systems ◽  
Natural Treatment ◽  
Removal Processes ◽  
Startup Period

This study developed a simple numerical model for nitrogen removal in biofilters, which was designed to enhance simultaneous nitritation and anaerobic ammonium oxidation (anammox). It is the first attempt to simulate anammox together with two-step nitrification in natural treatment systems, which may have different kinetic parameters and temperature effects from conventional bioreactors. Prediction accuracy was improved by adjusting kinetic coefficients over the startup period of the biofilters. The maximum rates of nitritation and nitrite oxidation increased linearly over time during the startup period. Simulations confirmed successful enhancement of simultaneous nitritation and anammox (SNA) in the biofilters, with anammox contributing 35% of ammonium removal. Effluent ammonium concentration was affected by influent ammonium concentration and the maximum nitritation rate, and was insensitive to the maximum nitrite oxidation rate and anammox substrate factor. Ammonium removal via SNA was likely limited by biomass of aerobic ammonia oxidizing bacteria in the biofilters. The developed model is a promising tool for studying the dynamics of nitrogen removal processes including SNA in natural treatment systems.

scholarly journals Diversity, Physiology, and Niche Differentiation of Ammonia-Oxidizing Archaea

2012 ◽  
Vol 78 (21) ◽  
pp. 7501-7510 ◽  
Author(s):  
Roland Hatzenpichler
Keyword(s):  
Nitrous Oxide ◽  
Current Knowledge ◽  
Aerobic Oxidation ◽  
Niche Differentiation ◽  
Future Research ◽  
Ammonia Oxidizing Bacteria ◽  
Relative Importance ◽  
Ammonia Monooxygenase ◽  
Content Type ◽  
Ammonia Oxidizing Archaea

ABSTRACTNitrification, the aerobic oxidation of ammonia to nitrate via nitrite, has been suggested to have been a central part of the global biogeochemical nitrogen cycle since the oxygenation of Earth. The cultivation of several ammonia-oxidizing archaea (AOA) as well as the discovery that archaeal ammonia monooxygenase (amo)-like gene sequences are nearly ubiquitously distributed in the environment and outnumber their bacterial counterparts in many habitats fundamentally revised our understanding of nitrification. Surprising insights into the physiological distinctiveness of AOA are mirrored by the recognition of the phylogenetic uniqueness of these microbes, which fall within a novel archaeal phylum now known asThaumarchaeota. The relative importance of AOA in nitrification, compared to ammonia-oxidizing bacteria (AOB), is still under debate. This minireview provides a synopsis of our current knowledge of the diversity and physiology of AOA, the factors controlling their ecology, and their role in carbon cycling as well as their potential involvement in the production of the greenhouse gas nitrous oxide. It emphasizes the importance of activity-based analyses in AOA studies and formulates priorities for future research.

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