Article
Agricultural Engineering
Liting Deng, Mingming Zhao, Ruixin Bi, Ayodeji Bello, Ugochi Uzoamaka Egbeagu, Jizhou Zhang, Shanshan Li, Yanhui Chen, Yue Han, Yu Sun, Xiuhong Xu
Summary: In this study, the influence of biochar on nitrification of cattle manure composting was explored by analyzing the ammonia-oxidizing microorganisms (AOMs) at multiple levels and aspects. The addition of biochar increased the diversity and copy numbers of AOMs, altered the transcription of amoA genes, and reduced ammonooxygenase (AMO) activity. Different microbial taxa, such as Crenarchaeota and Nitrosomonas, played crucial roles in mediating nitrogen transformation processes influenced by biochar.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Shuo Xiang, Yutong Han, Chao Jiang, Mengyan Li, Lecheng Wei, Jiashen Fu, Liang Zhu
Summary: In this study, a composite biologically active filter (BAF) was used to pretreat algae-laden synthetic raw water, demonstrating stable and effective treatment even at high algae concentrations. Zeolite primarily adsorbed NH4+-N, GAC enriched functional microorganisms for nitrification and organics biodegradation, while SBC enhanced the chemical and microbial removal ability of the BAF system. The structure and distribution of biofilm on each filter varied, with GAC accumulating the most MC-degrading microbes and SBC exhibiting the highest microbial community richness and diversity. Overall, the composite BAF with zeolite-GAC-SBC is suitable for algae-laden raw water pretreatment, allowing for application in drinking water pretreatment plants.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Jing Chen, Shuo Zhao, Yating Gan, Jing Wu, Jingcheng Dai, Dazhong Yan
Summary: DDT contamination inhibits soil ammonia oxidation, but it recovers over time. DDT affects the diversity and community composition of ammonia-oxidizing archaea, but has no significant effect on ammonia-oxidizing bacteria.
ENVIRONMENTAL POLLUTION
(2023)
Article
Agronomy
Heng Wang, Jian Hou, Bo Zhou, Xiaoyang Han
Summary: Drought reduces soil NH4+-N concentration and increases NO3--N concentration in tea yields. Drought duration and frequency of dry-wet watering inhibit the activity of AOA, but increase the activity of AOB. Water supply mode affects the relative abundance of AOA and AOB, but not their community structure at the genus level. Ammonia oxidation is primarily driven by AOA and AOB in weakly acidic and neutral soil. This study provides insights into soil nitrogen transformation and ammonia-oxidizing microorganisms under different water supply modes.
Article
Environmental Sciences
Maosheng Zheng, Guangli Mu, Anqi Zhang, Jiawen Wang, Fang Chang, Junfeng Niu, Xinwei Wang, Tian Gao, Zhirong Zhao
Summary: This study investigated the behaviors and performances of comammox bacteria, ammonia-oxidizing bacteria, and archaea during the nitrification process under different oxygen concentrations. The results showed that comammox bacteria became the dominant ammonia-oxidizers under low oxygen conditions, while the growth of archaea and ammonia-oxidizing bacteria was inhibited. Furthermore, different species of comammox bacteria showed different preferences for oxygen concentrations.
Article
Environmental Sciences
Shengjun Li, Lai Peng, Chenguang Yang, Shaoxian Song, Yifeng Xu
Summary: This review summarizes recent research on cometabolic biodegradation of antibiotics by AOMs, highlighting the significant roles of ammonia oxidizing bacteria, archaea, and complete ammonia oxidizers in nitrification and antibiotic removal. The study also suggests that antibiotics may have inhibitory or stimulating effects on AOMs, affecting microbial activity, community abundance, and ammonia monooxygenase subunit A gene expression level.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Ning Guo, Mengmeng Liu, Zhuhui Yang, Daoji Wu, Feiyong Chen, Jinhe Wang, Zhaoliang Zhu, Lin Wang
Summary: This study investigates the mechanism of 8-lactam antibiotic removal in a nitrifying sludge system. It finds that the removal of the antibiotic is synergistically carried out by ammonia-oxidizing bacteria, ammonia-oxidizing archaea, and heterotrophs through co-metabolism and hydrolysis. The study highlights the important roles of heterotrophs and antibiotic resistance genes in antibiotic biodegradation.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Pattaraporn Kunapongkiti, Chaiwat Rongsayamanont, Wuttichai Mhuantong, Preeyaporn Pornkulwat, Nampetch Charanaipayuk, Tawan Limpiyakorn
Summary: This study aimed to understand the limits of ammonia and organic loading rates for nitritation in a specific type of cell reactor and to investigate the microorganisms involved in nitrogen transformation. The results showed that nitritation was achieved at a certain ammonia loading rate, but was limited by increased chemical oxygen demand. Amplicon sequencing revealed the presence of various bacterial taxa, with ammonia-oxidizing bacteria being the dominant microorganisms. The study provides valuable insights for the application of nitritation entrapped cell reactors in wastewater treatment processes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Jian Zhao, Shangbiao Fang, Gang Liu, Weixiao Qi, Yaohui Bai, Huijuan Liu, Jiuhui Qu
Summary: Biodegradation plays a significant role in removing organic micropollutants during riverbank filtration processes. Ammonia-oxidizing microorganisms (AOM) have been found to be important in the removal of micropollutants, although their distribution and role in degradation are still unknown. This study explored the behavior of selected micropollutants and the distribution of AOM in riverbank filtration. The results showed that the selected micropollutants were effectively removed primarily through biodegradation and adsorption. The relative abundance of AOM increased from the inlet to the outlet, and inhibition of AOM led to a corresponding inhibition of micropollutant removal.
Article
Ecology
Elizabeth A. Mcdaniel, Matthew Scarborough, Daniel Girma Mulat, Xuan Lin, Pranav S. Sampara, Heather M. Olson, Robert P. Young, Elizabeth K. Eder, Isaac K. Attah, Lye Meng Markillie, David W. Hoyt, Mary S. Lipton, Steven J. Hallam, Ryan M. Ziels
Summary: Syntrophic acetate oxidation (SAO) is an important pathway for the conversion of acetate into methane through cross-feeding interactions between SAO bacteria (SAOB) and methanogenic archaea. This study enriched a thermophilic SAO community from an anaerobic digestion system and investigated the metabolic characteristics and genome information of the community members. The results revealed the differences in electron donors and the thermodynamic conditions for ATP production, highlighting the importance of flexibility in electron partitioning in the SAO process.
Article
Microbiology
Barbora Oudova-Rivera, Andrew T. Crombie, J. Colin Murrell, Laura E. Lehtovirta-Morley
Summary: Ammonia oxidizers play a crucial role in the global nitrogen cycle, but their activity can have adverse effects on human-impacted environments. This study examined the inhibition of ammonia oxidation by alcohols to expand our knowledge of inhibitors for ammonia oxidizers.
FEMS MICROBIOLOGY LETTERS
(2023)
Article
Engineering, Environmental
Hiroki Tsukamoto, Hop V. Phan, Toshikazu Suenaga, Shohei Yasuda, Megumi Kuroiwa, Shohei Riya, Atsushi Ogata, Tomoyuki Hori, Akihiko Terada
Summary: This study validated a microaerophilic activated sludge system for efficient ammonia retention and organic carbon removal from nitrogenous wastewater. The system controlled dissolved oxygen concentrations and solids retention times to mitigate N2O emissions and suppress ammonia-oxidizing microorganisms, achieving successful nitrogen management.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Plant Sciences
Hai Zhu, Jingsong Yang, Yanli Li, Xiaoyuan Liu, Huifang Jin, Jifu Li, Rongjiang Yao
Summary: This study investigated the effect of soil salinity on nitrification and ammonia-oxidizing microorganisms. The results showed that increased salinity inhibited nitrification and suppressed the abundance of both AOA and AOB. The community structure of AOB was significantly altered by soil salinity, while the effect on AOA was not significant. Ammonia-oxidizing bacteria adapted to soil salinity through the replacement of salt-intolerant species with salt-tolerant species.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2022)
Article
Engineering, Environmental
Xiangyu Yang, Fucheng Guo, Tao Liu, Qiang He, Jan Vymazal, Yi Chen
Summary: This study investigated the impacts of engineered nanomaterials (ENMs) on ammonia-oxidizing microorganisms (AOMs) in constructed wetlands (CWs). It was found that the abundance and contribution of AOA increased under exposure to ENMs, but AOB remained the primary executant of ammoxidation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Limin Fan, Liping Qiu, Gengdong Hu, Chao Song, Shunlong Meng, Dandan Li, Jiazhang Chen
Summary: This study investigated ammonia-oxidizing bacterial communities in water and surface sediments of three tilapia ponds and found that the abundance and diversity of these bacterial communities were influenced by monthly variations in the water and sediment differences among the ponds. The main factors affecting the bacterial communities in the water were total nitrogen, nitrate, total phosphorus, and sulphate, while total phosphorus was the main influencing factor in the sediments.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Environmental
Michael B. Waak, Timothy M. LaPara, Cynthia Halle, Raymond M. Hozalski
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2018)
Article
Engineering, Environmental
Ben Ma, William A. Arnold, Raymond M. Hozalski
Article
Ecology
Patrick L. Brezonik, R. William Bouchard, Jacques C. Finlay, Claire G. Griffin, Leif G. Olmanson, Jesse P. Anderson, William A. Arnold, Raymond Hozalski
ECOLOGICAL APPLICATIONS
(2019)
Article
Multidisciplinary Sciences
Patrick L. Brezonik, Jacques C. Finlay, Claire G. Griffin, William A. Arnold, Evelyn H. Boardman, Noah Germolus, Raymond M. Hozalski, Leif G. Olmanson
Article
Microbiology
Michael B. Waak, Raymond M. Hozalski, Cynthia Halle, Timothy M. LaPara
Article
Engineering, Environmental
Raymond M. Hozalski, Timothy M. LaPara, Xiaotian Zhao, Taegyu Kim, Michael B. Waak, Tucker Burch, Michael McCarty
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Engineering, Environmental
Ben Ma, Timothy M. LaPara, Taegyu Kim, Raymond M. Hozalski
Summary: This study investigated the abundance and composition of ammonia-oxidizing microorganisms (AOMs) in full-scale and pilot-scale biofilters. The results showed that AOB had the highest relative abundance, followed by comammox Nitrospira and AOA. The abundance of AOB in the pilot-scale biofilters was influenced by influent ammonia concentration and temperature, while AOA and comammox Nitrospira were not correlated with these parameters. The biofilters affected AOM abundance but had a minor influence on the composition of AOB and Nitrospira sublineage II communities.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Taegyu Kim, Xiaotian Zhao, Timothy M. LaPara, Raymond M. Hozalski
Summary: In this study, microbial communities in premise plumbing systems were investigated during long-term stagnation, flushing, and post-flush stagnation. Buildings supplied with chlorinated groundwater had the lowest bacterial concentrations, while buildings supplied with untreated groundwater had consistent bacterial concentrations and microbial community diversity. Buildings supplied with chloraminated surface water had high concentrations of total bacteria, Legionella spp., and NTM during long-term stagnation, but these concentrations decreased after flushing and the microbial community diversity quickly recovered during post-flush stagnation. The results suggest that buildings supplied with disinfected surface water are more prone to microbial water quality deterioration during stagnation and flushing with chloraminated water has short-lived effects.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Jiaqi Li, William A. Arnold, Raymond M. Hozalski
Summary: The temporal and spatial variations in N-nitrosodimethylamine (NDMA) precursor levels in the Crow River in Minnesota, USA, were investigated through monthly sampling at 12 locations over 18 months. The NDMA precursors were quantified using the NDMA formed under low chloramine dose uniform formation conditions (NDMA(UFC)) and occasionally the high dose formation potential (NDMA(FP)). The results showed that NDMA precursor levels exhibited temporal variation but relatively little spatial variation, with an increase observed after lime-softening treatment.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Stephanie M. M. Berg, Raymond M. M. Hozalski, Camilla Kuo-Dahab, CheFei Chen, Todd J. J. Elliott, Grant J. J. Goedjen, Huan He, Eric R. R. Noe, Roger G. G. Scharf, William A. A. Arnold
Summary: Advanced drinking water treatment methods, such as biological activated carbon (BAC) filtration, ozonation, and advanced oxidation processes (AOPs), can effectively remove trace organic contaminants. Compared to conventional methods, a pilot-scale lime-softening drinking water treatment plant using BAC alone or in combination with ozone/AOP treatment units showed improved removal of various contaminants.
Article
Engineering, Environmental
Eric R. Noe, Jiaqi Li, William A. Arnold, Raymond M. Hozalski
Summary: This study investigates the effectiveness of preoxidation with ozone, free chlorine, or both on the removal of NDMA precursors in different types of water samples. The results show that ozone preoxidation effectively decreases NDMA concentrations in all water samples, and the combination of free chlorine and ozone is more effective at removing NDMA precursors in recarbonated water.
ENVIRONMENTAL ENGINEERING SCIENCE
(2023)
Article
Environmental Sciences
Charuka S. Meegoda, Michael B. Waak, Taegyu Kim, Raymond M. Hozalski, Cynthia Halle
Summary: In Norway, placing water treatment plant intakes within the lake hypolimnion is considered a hygienic barrier against fecal pathogens. However, this study found that this practice may not provide sufficient protection against opportunistic pathogens like Legionella.
Article
Engineering, Environmental
Sara BinAhmed, Raymond M. Hozalski, Santiago Romero-Vargas Castrillon
Summary: The study revealed that higher feedwater temperatures lead to decreased organic fouling of reverse osmosis membranes. More severe fouling was observed at higher temperatures, but with higher water permeance resulting in a greater flux of foulants to the membrane. The development of fouling layer within an initial 2 hours dramatically decreased flux, with subsequent losses being small and independent of temperature due to weak, often repulsive foulant-foulant interactions hindering further foulant deposition.
ACS ES&T ENGINEERING
(2021)
Article
Environmental Sciences
Raymond M. Hozalski, Ben Ma, Ashley N. Evans, Sarah E. Page, Zhong Zhang, William A. Mitch, Caroline Russell, Sigrid Peldszus, Michele Van Dyke, Peter M. Huck
Summary: This study investigated the effects of filter media type and backwashing conditions on N-nitrosodimethylamine (NDMA) precursor production across biofilters. The results showed that backwashing with nonchloraminated filtrate reduced NDMA precursor production, especially in the GAC-sand biofilters, which also produced significantly lower NDMA concentrations compared to the anthracite-sand biofilters. Biological activity was found to be crucial in promoting precursor increase through biofilters, with a linear correlation between ATP concentration and NDMA(SDS) concentration changes across the biofilters. Additionally, the study highlighted the importance of particle-associated NDMA precursors in biofilm or biofilm-associated compounds as significant contributors to NDMA precursors in the filtrate.
Article
Water Resources
Rebecca Nestingen, Brooke C. Asleson, John S. Gulliver, Raymond M. Hozalski, John L. Nieber
JOURNAL OF SUSTAINABLE WATER IN THE BUILT ENVIRONMENT
(2018)