Article
Biotechnology & Applied Microbiology
Georgios Manthos, Leila Abbaszadeh, Dimitris Zagklis, Michael Kornaros
Summary: In this study, a comprehensive mathematical model was developed to describe the nitrification process in mixed cultures involving isolated NOB and starved AOB, allowing for a more accurate representation of the biological dynamics during starvation conditions. The accuracy of the model was confirmed by testing its predictions against experimental data. This model provides insights into the intricate mechanisms underlying nitrification, contributing to the advancement of sustainable wastewater treatment practices.
FERMENTATION-BASEL
(2023)
Article
Engineering, Environmental
Mingzhu Yang, Shuang Qiu, Lingfeng Wang, Zhipeng Chen, Yanbing Hu, Jianhua Guo, Shijian Ge
Summary: This study investigated the effects of light irradiation on the activities and physiological characteristics of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in activated sludge. The results showed that moderate light irradiation could enhance the activity of ammonia-oxidizing bacteria, while excessive light could inhibit the activities of both types of bacteria. These findings contribute to our understanding of the physiological responses of nitrifiers to short-term light irradiation and have implications for the development of sustainable wastewater treatment technologies.
Article
Engineering, Environmental
Lingfeng Wang, Shuang Qiu, Jianhua Guo, Shijian Ge
Summary: Nitritation can be rapidly initiated using light irradiation, promoting the activity and growth of ammonia-oxidizing bacteria while suppressing nitrite-oxidizing bacteria. Optimal light energy densities can lead to high nitrite accumulation ratios, converting ammonia to nitrate. Additionally, light irradiation induces different responses of AOB and NOB, optimizing microbial structure while ensuring AOB predominance and stable nitritation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Lina Wu, Chunfang Jia, Shan Huang, Ke Yu, Anteng Luo, Yongzhen Peng
Summary: Until recently, nitrite oxidation was only known to occur in oxygen-rich conditions, but now it has been observed in low oxygen or anoxic environments in the ocean. However, this phenomenon is rarely reported in wastewater treatments and its mechanism is unknown. In this study, partial nitrification and nitrite oxidation were conducted in a low oxygen environment to remove nitrogen from landfill leachate. The results showed a decrease in nitrite concentration and an increase in nitrate concentration, and the main microorganisms involved were Nitrite-Oxidizing Bacteria (NOB).
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Qintong Li, Ryo Hasezawa, Riho Saito, Kunihiro Okano, Kazuya Shimizu, Motoo Utsumi
Summary: Recirculating aquaculture systems (RAS) play an important role in water quality management and water conservation. This study compared the community structures of micro-ecosystems in RAS systems operated at different temperatures in a marine aquarium. It was found that AOA was the primary nitrifier in the biofilters, and its abundance and diversity were higher in high-temperature samples. NOB showed similar relative abundance patterns to AOA, suggesting a cooperative relationship between the two in the marine RAS system.
Article
Environmental Sciences
Xia Jia, Yunfeng Gao, Xiaodi Li, Yonghua Zhao, Lu Wang, Chunyan Zhang
Summary: This study investigated the impacts of elevated CO2 and cadmium levels on soil nitrification in the rhizosphere of Robinia pseudoacacia L. seedlings. The results showed that elevated CO2 combined with Cd pollution generally stimulated nitrification enzyme activities and influenced bacterial community structures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Anouk F. Duque, Vania S. Bessa, Udo van Dongen, Merle K. de Kreuk, Raquel B. R. Mesquita, Antonio O. S. S. Rangel, Mark C. M. van Loosdrecht, Paula M. L. Castro
Summary: This study investigated the long-term effects of 2-fluorophenol on bacterial communities in aerobic granular sludge. The results showed that bioaugmentation with the FP1 strain successfully removed N, P, and 2-FP simultaneously, with high removal efficiencies.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Soil Science
Haiyang Liu, Hangwei Hu, Xing Huang, Tida Ge, Yongfu Li, Zhenke Zhu, Xingmei Liu, Wenfeng Tan, Zhongjun Jia, Hongjie Di, Jianming Xu, Yong Li
Summary: Chemoautotrophic canonical ammonia-oxidizers play a significant role in autotrophic nitrification during the mineralization of organic substances with low C/N ratios in paddy soils, as shown by N-15 tracing and DNA-SIP techniques.
SOIL BIOLOGY & BIOCHEMISTRY
(2021)
Article
Soil Science
Xian-Fang Wang, Jie Li, Gang Li, Gui-Long Zhang, Zhi-Wen Wang, Yan-Cai Zhi, Meng-Li Wu, Xin Lai, Dian-Lin Yang, Tian-Zhi Ren
Summary: This study found that the application of biochar can significantly enhance soil nitrite oxidation, especially the abundance of Nitrobacter bacteria. The combination of biochar and nitrogen fertilizer also has the potential to alter the community composition of Nitrobacter.
APPLIED SOIL ECOLOGY
(2022)
Article
Environmental Sciences
Mohamad-Javad Mehrani, Dominika Sobotka, Przemyslaw Kowal, Jianhua Guo, Jacek Makinia
Summary: This study extended the conventional two-step nitrification model by incorporating complete ammonia oxidation (comammox) and heterotrophic nitrification on soluble microbial products. A new calibration protocol was proposed and the impact of initial biomass concentrations and growth rates on model accuracy was investigated using response surface methodology. The extended model was accurately calibrated and validated, providing a better understanding of the effects of initial biomass composition on two-step nitrification modeling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Md Mahbubul Alam, Arvid Masud, Brianna Scharf, Ian Bradley, Nirupam Aich
Summary: This study demonstrates that NHs have unique effects on microbial community growth and function, which cannot be predicted solely from parent materials.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Nan Zhang, Yuecheng He, Xiang Yi, Yunan Yan, Wenlai Xu
Summary: The experiment successfully started the autotrophic shortcut nitrification system with high removal efficiency of nitrite and ammonium nitrogen; the richness of main denitrifying bacteria phylum Proteobacteria increased, while the richness of ammonia oxidizing bacteria Nitrosomonas and nitrite oxidizing bacteria Nitrospira showed significant changes.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Zihao Wang, Yongzhen Peng, Jianwei Li, Jinjin Liu, Qiong Zhang, Xiyao Li, Liang Zhang
Summary: This study proposes a feasible and economical strategy to rapidly achieve nitritation of municipal wastewater by aggressively discharging excess sludge during the seasonal warming period, which leads to the establishment and maintenance of stable nitritation. The results provide potential applications for municipal wastewater treatment.
Article
Agricultural Engineering
Yuan Sui, You-Wei Cui, Ji-Lin Huang, Meng-Jiao Xu
Summary: The feast/famine ratio was found to regulate the population succession of autotrophic ammonia oxidizing bacteria (AOB) and heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria, providing a solution for enriching HN-AD bacteria in halophilic aerobic granular sludge (HAGS) systems.
BIORESOURCE TECHNOLOGY
(2024)
Article
Biodiversity Conservation
Manman Chen, Hong Pan, Mingjie Sun, Wei He, Meng Wei, Yanhong Lou, Hui Wang, Quangang Yang, Haojie Feng, Yuping Zhuge
Summary: Organic fertilizer application increased N2O emissions from nitrification, dominated by the Nitrosospira cluster 3 lineage of AOB, while chemical N fertilizer stimulated N2O production from denitrification, dominated by the nirK lineage of Rhizobiales. The study highlights the different effects of organic and chemical fertilizers on N2O microbial emission pathways in agricultural soils.
ECOLOGICAL INDICATORS
(2021)
Article
Agricultural Engineering
Yinping Xiang, Meiying Jia, Rui Xu, Jialu Xu, Lele He, Haihao Peng, Weimin Sun, Dongbo Wang, Weiping Xiong, Zhaohui Yang
Summary: This study investigated the impact of the non-antibiotic pharmaceutical carbamazepine on antibiotic resistance genes (ARGs) during anaerobic digestion. The results showed that carbamazepine induced the enrichment of ARGs and increased the abundance of bacteria carrying these genes. It also facilitated microbial aggregation and intercellular communication, leading to an increased frequency of ARGs transmission. Moreover, carbamazepine promoted the acquisition of ARGs by pathogens and elevated their overall abundance.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Weixin Zhao, Tianyi Hu, Hao Ma, Dan Li, Qingliang Zhao, Junqiu Jiang, Liangliang Wei
Summary: This review summarizes the effects and potential mechanisms of biochar on microbial behavior in AD systems. The addition of biochar has been found to promote microbial colonization, alleviate stress, provide nutrients, and enhance enzyme activity. Future research directions include targeted design of biochar, in-depth study of microbial mechanisms, and improved models.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Christina Karmann, Anna Magrova, Pavel Jenicek, Jan Bartacek, Vojtech Kouba
Summary: This review assesses nitrogen removal technologies in reject water treatment, highlighting the differences in environmental impacts and economic benefits. Partial nitritation-anammox shows potential for economic benefits and positive environmental outcomes when operated and controlled properly.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Wei-Hao Huang, Ying-Ju Chang, Duu-Jong Lee
Summary: This study modified pinecone biochar with layered double hydroxide (LDH) to enhance its adsorption capacity for heavy metal and phosphate ions. The LDH-biochar showed significantly improved adsorption capacities for Pb2+ and phosphate, and a slight increase for Cu2+ and Co2+. The LDH layer enhanced the adsorption through various mechanisms.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Chao Song, Fanfan Cai, Shuang Yang, Ligong Wang, Guangqing Liu, Chang Chen
Summary: This paper developed a machine learning model to predict the biochemical methane potential during anaerobic digestion. Model analysis identified lignin content, organic loading, and nitrogen content as key attributes for methane production prediction. For feedstocks with high cellulose content, early methane production is lower but can be improved by prolonging digestion time. Moreover, lignin content exceeding a certain value significantly inhibits methane production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sang Min Lee, Ju Young Lee, Ji-Sook Hahn, Seung-Ho Baek
Summary: This study successfully developed an efficient platform strain using Yarrowia lipolytica for the bioconversion of renewable resources into adipic acid, achieving a remarkable increase in production level.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sefkan Kendir, Matthias Franzreb
Summary: This study presents a novel approach using magnetic separation to efficiently harvest freshwater microalgae, Chlorella vulgaris. By combining pH-induced calcium phosphate precipitation with cheap natural magnetite microparticles, harvesting efficiencies up to 98% were achieved in the model medium.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Ishaq Kariim, Ji-Yeon Park, Wajahat Waheed Kazmi, Hulda Swai, In-Gu Lee, Thomas Kivevele
Summary: The impact of reaction temperature, residence time, and ethanol: acetone on the energy compositions and yield enhancement of biocrudes was investigated. The results showed that under appropriate conditions, biocrudes with high energy and low oxygen content can be obtained, indicating a high potential for utilization.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xu Yang, Mahmoud Mazarji, Mengtong Li, Aohua Li, Ronghua Li, Zengqiang Zhang, Junting Pan
Summary: This study investigated the impact of magnetite on the nitrogen cycle of pig manure biostabilisation. The addition of magnetite increased N2O emissions and decreased NH3 emissions during composting. It also increased the total nitrogen content but should be considered for its significant increase in N2O emissions in engineering practice.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Ty Shitanaka, Haylee Fujioka, Muzammil Khan, Manpreet Kaur, Zhi-Yan Du, Samir Kumar Khanal
Summary: The market value of microalgae has exponentially increased in the past two decades, thanks to their applications in various industries. However, the supply of high-value microalgal bioproducts is limited due to several factors, and strategies are being explored to overcome these limitations and improve microalgae production, thus increasing the availability of algal-derived bioproducts in the market.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Martin Kerner, Thorsten Wolff, Torsten Brinkmann
Summary: The efficiency of using enriched CO2 from flue gas for large-scale production of green microalgae has been studied. The results show that the use of membrane devices and static mixers can effectively improve the CO2 recovery rate and maintain the suitable pH and temperature during cultivation, achieving a more economical and sustainable microalgae production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Bing Wang, Peng Zhang, Xu Guo, Xu Bao, Junjie Tian, Guomin Li, Jian Zhang
Summary: The addition of zeolite in the co-composting of chicken manure and straw significantly reduced the emissions of ammonia and N2O, and increased the nitrate content. Zeolite also promoted the abundance of nitrification genes and inhibited the expression of denitrification genes.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rohit Dey, Franziska Ortiz Tena, Song Wang, Josef Martin Messmann, Christian Steinweg, Claudia Thomsen, Clemens Posten, Stefan Leu, Matthias S. Ullrich, Laurenz Thomsen
Summary: This study investigated the operation of a 1000L microalgae-based membrane photobioreactor system for continuous secondary wastewater treatment. The research focused on a green microalgae strain called Desmodesmus sp. The study aimed to understand key trends and optimization strategies by conducting experiments in both summer and winter seasons. The findings showed that maintaining low cell concentrations during periods of light inhibition was beneficial for nutrient uptake rates. Effective strategies for enhancing algae-based wastewater treatment included cell mass recycling and adjusting dilution rates based on light availability.
BIORESOURCE TECHNOLOGY
(2024)