Article
Environmental Sciences
Da Kang, Ping Zheng, Wenji Li, Dongdong Xu, Wenda Chen, Chao Pan
Summary: This study investigates the stratification patterns of anammox granular sludge bed (GSB) and its relationship with microbial activity and community under different nitrogen loading rates (NLRs). Results show that the particle size distribution of GSB is significantly correlated with the nitrogen removal rate (NRR) of the anammox system. The microbial community tends to coverage at high NLR. Additionally, the particle size distribution patterns of GSB may serve as a potential auxiliary indicator to reflect microbial activity and community.
ENVIRONMENTAL RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Junxiang Xie, Tianyi An, Adams Mabruk, Yayi Wang, Jianfang Wang, Chongjun Chen, Tian C. Zhang
Summary: Different biochars were added to the reactors, resulting in faster start-up of Anammox and improved structural and functional characteristics of the granular sludge.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Chao Pan, Dongdong Xu, Ziyang Dong, Wenji Li, Da Kang, Wenda Chen, Yiyu Li, Meng Zhang, Baolan Hu, Ping Zheng
Summary: This study investigated the effects of different cooling modes on the properties of anammox granular sludge, finding that temperature decrease can improve its physical preservability and impact the preservation rate of functional bacteria. The findings, especially the induction of dormancy in AnAOB, contribute to understanding the effect of temperature decrease on AnGS and promoting the development of preservation technology for AnGS.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Environmental Sciences
Anna Christine Trego, Simon Mills, Gavin Collins
Summary: Anaerobic digestion is recognized as a sustainable method for waste management, producing methane-rich biogas. Different specialized granules, including anaerobic and aerobic granules, have opened up new opportunities in wastewater treatment and resource recovery biotechnology. Each type of granule has unique characteristics, biochemical processes, and microbial community compositions.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Victor Guzman-Fierro, Jose Sanhueza, Constanza Arriagada, Luis Pereira, Victor Campos, Juan Jose Gallardo, Marlene Roeckel
Summary: The study showed a direct association between specific nitrification activity (SNA) and the specific surface of granules, highlighting the importance of the outer layer in the nitrification process. Furthermore, specific anammox activity (SAA) varied when faced with real industrial and synthetic substrates, with SAA increasing at higher diameter ranges in industrial wastewater. Granular sedimentation rate could be used as a routine technique for controlling and starting up PN-A reactors, with organic matter potentially beneficial for granular sludge stability and nitrogen removal.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Agricultural Engineering
Dong Li, Yiwen Dong, Shuai Li, Pengfei Jiang, Jie Zhang
Summary: This article explores the use of biochar and increased HRT to enhance the recovery of stored anaerobic ammonia oxidation granular sludge. The results show that biochar accelerates the recovery process, shortening the time needed for nitrogen removal and re-granulation. It also promotes the growth of Anammox bacteria and improves the stability of the bioreactor. The optimized community structure of biochar makes the system more resistant to risks.
BIORESOURCE TECHNOLOGY
(2023)
Review
Environmental Sciences
Mabruk Adams, Junxiang Xie, Arthur wendinso Judicael Kabore, Yaofeng Chang, Jiawei Xie, Menglei Guo, Chongjun Chen
Summary: This article discusses the application of Anammox granular sludge, including its properties, influencing factors, limitations, cultivation, and research progress. The granulation of Anammox sludge is considered to be the most feasible option for large-scale Anammox application.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Agricultural Engineering
Jiarui Fan, Rui Du, Qingtao Liu, Cong Li, Yongzhen Peng
Summary: Microbial interactions between Anammox and heterotrophic bacteria were analyzed in this study. The study found that the proportion of Anammox microorganisms varied in different granule sizes and heterotrophs could stimulate Anammox activity through organic carbon. The results indicate that efficient nitrogen removal can be achieved by regulating the distribution of sludge size and organic carbon source.
BIORESOURCE TECHNOLOGY
(2022)
Review
Engineering, Environmental
Xiaochuan Ran, Mingda Zhou, Tong Wang, Weigang Wang, Sheena Kumari, Yayi Wang
Summary: This article provides an overview of nitrogen-removal granular sludge (NRGS) technology, with a focus on its characterization. The integrated nitrogen transformation pathways and performance of NRGS in treating various wastewaters are discussed. NRGS properties are categorized and corresponding characterization technologies are presented. Future prospects for understanding and applying NRGS technology are proposed.
Article
Engineering, Environmental
Chao Pan, Wenji Li, Dongdong Xu, Wenda Chen, Leiyan Guo, Da Kang, Baolan Hu, Ping Zheng, Meng Zhang
Summary: This study investigated the activity descent and its mechanism of anammox granular sludge (AnGS) during long-term cryopreservation. The cryopreservation process of AnGS was divided into three stages: plummeting stage, maintaining stage, and descending stage in terms of activity index. A significant positive correlation was found between the ATP pool and the three-stage activity descent of AnGS. The ATP pool was replenished through the sequential consumption of endogenous energy substances, maintaining the activity of AnGS.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Hyungmin Choi, Jinsu Kim, Jihun Park, Changsoo Lee
Summary: Even small fluctuations in wastewater's organic matter significantly affect the structure and function of anammox microbial communities. Continuous organic load at 30 mg COD/L improved nitrogen removal efficiency without compromising anammox performance. Higher levels of continuous organic load caused inhibition of anammox activity, while transient organic load's inhibitory effect was fully reversed within one day. Loading an appropriately low amount of organic matter can improve the nitrogen removal performance of anammox granular sludge without sacrificing anammox activity and granule stability under mainstream conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Zhipeng You, Ji Zhao, Han Xiang, Jimiao Wang, Ruihuan Gu, Yan Zhang, Chuanhao Shen, Deshuang Yu, Xiaoxia Wang
Summary: This study compared two methods for re-granulation of granular sludge and found that shaking with zirconia balls can increase the particle size while maintaining high nitrogen removal efficiency, while stirring with a blender can decrease the nitrogen removal efficiency but increase the abundance of indicator microorganisms.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
C. Polizzi, T. Lotti, A. Ricoveri, R. Campo, C. Vannini, M. Ramazzotti, D. Gabriel, G. Munz
Summary: This study highlights the importance of controlling mineral precipitation on granular sludge systems treating wastewaters prone to inert precipitation to ensure long-term stability. Severe mineral precipitation on the granules' surface can lead to deteriorated reactor performance and biomass activity, with potential mechanisms including substrate diffusion limitation, insufficient mixing, and biofilm erosion. Gravimetric selection proved effective in restoring process performance affected by mineral precipitation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Lei Liang, Jinghuan Luo, Xiangmin Xiao, Jianwei Wang, Meng Hong, Chao Deng, Yu-You Li, Jianyong Liu
Summary: This study found that the addition of granular activated carbon (GAC) at low phosphate concentrations can promote re-granulation of ANAMMOX-HAP granules, avoiding sludge flotation and expanding their application as an inoculum.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Boran Wu, Xiuzhong Wang, Chengxian Wang, Bin Lu, Jing Yi, Xiaohu Dai, Xiaoli Chai
Summary: A novel high-concentration powder bio-carrier (HPB) process was developed for the high-load treatment of low-strength municipal wastewater with low C/N ratio, which facilitated rapid sludge micro-granulation and enhanced nitrogen removal efficiency. The process achieved higher volumetric load and optimized microbial structure, leading to promising results for the highly efficient treatment of low-strength municipal wastewater.
Article
Ecology
Jia-Wei Zhang, Hong-Po Dong, Li-Jun Hou, Yang Liu, Ya-Fei Ou, Yan-Ling Zheng, Ping Han, Xia Liang, Guo-Yu Yin, Dian-Ming Wu, Min Liu, Meng Li
Summary: Asgard archaea, known for their potential in utilizing various organic substrates in sediment carbon cycling, have a new affiliate phylum called Hermodarchaeota which shows potential in anaerobic degradation of alkanes and aromatic compounds. Through screening metagenomic datasets, genes similar to Hermodarchaeota were identified in marine and freshwater sediments, suggesting widespread presence of Asgard archaea capable of degrading alkanes and aromatics.
Article
Environmental Sciences
Cheng Chen, Guoyu Yin, Lijun Hou, Min Liu, Yinghui Jiang, Dongsheng Zheng, Dengzhou Gao, Cheng Liu, Yanling Zheng, Ping Han
Summary: This study investigated the effects of sulfamethoxazole (SMX) at near in situ concentration on nitrogen removal processes coupled with nitrification. The results demonstrated that SMX significantly decreased nitrogen removal rates, increased N2O production, and nitrite accumulation. The inhibition of nitrogen transformation functional genes by SMX was more pronounced in heterotrophic denitrification processes.
ENVIRONMENTAL POLLUTION
(2021)
Article
Biotechnology & Applied Microbiology
Mohammad Azari, Aisha Jurnalis, Martin Denecke
Summary: Two hybrid biofilm reactors were used for enhanced nitrogen removal based on the anammox process under intermittent aeration. IFAS-SBR showed more stable and reliable performance compared to the other reactor, with nitrogen removal efficiency reaching up to 99% based on NH4+-N concentration. The abundance of specific microbial species in the biofilm and flocs played a crucial role in system efficiency.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Soil Science
Yinghui Jiang, Guoyu Yin, Ye Li, Lijun Hou, Min Liu, Cheng Chen, Dongsheng Zheng, Han Wu, Dengzhou Gao, Yanling Zheng, Ping Han
Summary: The study investigates the effects of salinity on nitrogen transformation processes and N2O emission rates. The results show that saltwater incursion can increase the contribution of heterotrophic denitrification to N2O emission, and under high salinity, nitrification-coupled denitrification becomes the dominant pathway of N2O emission.
BIOLOGY AND FERTILITY OF SOILS
(2023)
Article
Agricultural Engineering
Mohamad-Javad Mehrani, Mohammad Azari, Burkhard Teichgraber, Peter Jagemann, Jens Schoth, Martin Denecke, Jacek Makinia
Summary: This study aimed to optimize mainstream deammonification in an integrated fixed-film activated sludge pilot plant under natural seasonal temperature variations. The effect of temperature on the performance was evaluated and the correlation of performance parameters was investigated. Optimizing intermittent aeration significantly increased the N-removal rate and N removal efficiency. This study's findings are important for enhancing the efficiency of mainstream deammonification.
BIORESOURCE TECHNOLOGY
(2022)
Article
Ecology
Ya-Fei Ou, Hong-Po Dong, Simon J. McIlroy, Sean A. Crowe, Steven J. Hallam, Ping Han, Jens Kallmeyer, Rachel L. Simister, Aurele Vuillemin, Andy O. Leu, Zhanfei Liu, Yan-Ling Zheng, Qian-Li Sun, Min Liu, Gene W. Tyson, Li-Jun Hou
Summary: Methanogenic archaea, which produce methane, play a significant role in Earth's climate change. These diverse microorganisms are commonly found in oxygen-depleted environments and can be classified into two subgroups based on their use of b-type cytochromes. Those with b-type cytochromes have a wider range of substrates and higher growth yields. A recent discovery includes new metagenome-assembled genomes of methanogenic archaea with methyl-coenzyme M reductase genes found in anoxic sediments, highlighting the presence of a novel archaeal order, Ca. Methylarchaeales, within the phylum Thermoproteota. These microorganisms possess the genes necessary for methyl-reducing methanogenesis and the Wood-Ljundahl pathway. Importantly, they also encode a cytochrome b-containing heterodisulfide reductase and methanophenazine-reducing hydrogenase complex. These findings suggest that members of the Ca. Methylarchaeales are capable of energy conservation through membrane-bound electron transport chains. Phylogenetic and likelihood estimation analyses indicate that methanogens with cytochrome b-containing electron transfer complexes likely evolved before the diversification of Thermoproteota or Ca. Halobacteriota in the early Archean Eon. Surveys of public sequence databases indicate the global distribution of Ca. Methylarchaeales in anoxic sediments and their potential importance in the methane cycle.
Article
Soil Science
Shuntao Chen, Dengzhou Gao, Jinbo Zhang, Christoph Muller, Xiaofei Li, Yanling Zheng, Hongpo Dong, Guoyu Yin, Ping Han, Xia Liang, Min Liu, Lijun Hou
Summary: Saltmarsh plants play a crucial role in regulating nitrogen dynamics in estuarine and coastal wetlands. They enhance the availability of ammonium (NH4+) for plant uptake while reducing NH4+ immobilization and autotrophic nitrification rates. The invasive plant Spartina alterniflora has a greater impact on soil nitrogen transformations compared to the native Phragmites australis. The findings provide valuable insights into the ecological management of invasive plants in estuarine and coastal ecosystems.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Soil Science
Dongyao Sun, Xiufeng Tang, Jun Li, Min Liu, Lijun Hou, Guoyu Yin, Cheng Chen, Qiang Zhao, Uli Klumper, Ping Han
Summary: The study evaluated the impact and specificity of various specific nitrification inhibitors on comammox Nitrospira in pure and mixed cultures. It was found that chlorate specifically inhibited the ammonia and nitrite oxidation activity of comammox Nitrospira, allowing for the quantification of comammox activity in wetlands and providing insights into the ecological roles of comammox bacteria in coastal environments.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Engineering, Environmental
Xia Liang, Baoli Wang, Dengzhou Gao, Ping Han, Yanling Zheng, Guoyu Yin, Hongpo Dong, Yali Tang, Lijun Hou
Summary: This study quantitatively assessed the contributions of nitrification and denitrification to nitrous oxide (N2O) production in a eutrophic lake. The results showed that denitrification accounted for approximately 90% of the lake's N2O production during summer and autumn, with a significant portion being simultaneously eliminated through N2O reduction. Surprisingly, nitrification acted as a key process promoting N2O production and contributing to the lake as a source of N2O emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Xiufeng Tang, Jun Li, Dongyao Sun, Linfa Fang, Lijun Hou, Min Liu, Ping Han
Summary: This study investigated the nitrification process in typical inland and coastal wetlands in northern China and found a high diversity of ammonia oxidizers. Through simulating the freezing-thawing state and conducting microcosm incubation, researchers discovered that ammonia-oxidizing archaea and comammox Nitrospira clade B were able to recover their activities after the freeze-thaw cycle, indicating their resistance to freeze-thaw conditions.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2023)
Article
Engineering, Environmental
Ping Han, Ana B. Rios-Miguel, Xiufeng Tang, Yaochun Yu, Li-Jun Zhou, Lijun Hou, Min Liu, Dongyao Sun, Mike S. M. Jetten, Cornelia U. Welte, Yujie Men, Sebastian Lucker
Summary: This study investigated the metabolic capacity of comammox Nitrospira inopinata and Nitrospira kreftii to transform benzimidazole fungicides. The comammox bacteria were found to actively transform all the tested fungicides, except for thiabendazole. The identified transformation products suggested hydroxylation, S-oxidation, and glycosylation as the major biotransformation pathways.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Multidisciplinary Sciences
Jie Zhou, Yanling Zheng, Lijun Hou, Zhirui An, Feiyang Chen, Bolin Liu, Li Wu, Lin Qi, Hongpo Dong, Ping Han, Guoyu Yin, Xia Liang, Yi Yang, Xiaofei Li, Dengzhou Gao, Ye Li, Zhanfei Liu, Richard Bellerby, Min Liu
Summary: In the face of increasing atmospheric CO2 levels, the acidification of estuarine and coastal waters is greatly intensified by land-derived nutrient inputs, coastal upwelling, and complex biogeochemical processes. This study shows that acidification can decrease nitrification rates but stimulate the production of the greenhouse gas N2O. The findings highlight the molecular mechanisms behind the effects of acidification on nitrification and N2O emission, contributing to predictions of estuarine and coastal ecosystem responses to climate change and human activities.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Qiang Zhao, Dongyao Sun, Xiufeng Tang, Lijun Hou, Min Liu, Ping Han
Summary: This study investigated the geographical distribution of Nitrospira along the coastal wetlands of China and found that its abundance is higher than that of ammonia-oxidizing bacteria. The distribution composition of Nitrospira varies due to environmental factors, and network analysis showed that cooperation plays a dominant role in the population relationship. These findings deepen our understanding of the role of Nitrospira in nitrogen cycling.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Xiufeng Tang, Ye Li, Min Liu, Lijun Hou, Ping Han
Summary: This study investigated the communities of ammonia oxidizers in urban groundwater in Shanghai, China. It found that complete ammonia oxidizer (comammox Nitrospira) dominated over classical ammonia oxidizers and that temperature was an important factor affecting their community. It also revealed that clade A comammox Nitrospira can be enriched by urea substrate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Engineering, Environmental
Javid Gholami-Shiri, Mohammad Azari, Shabnam Dehghani, Martin Denecke
Summary: High energy consumption, operational costs, and environmental concerns in municipal wastewater treatment have led to the exploration of autotrophic nitrogen removal to decrease costs and environmental footprints. While the feasibility of partial nitrification/anammox process for municipal wastewater treatment is supported, its application in temperate climates for high-rate nitrogen removal has not been widely confirmed.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Shaofeng Zhou, Wenwen An, Cuifen Gan, Meiying Xu
Summary: Bacteria generate and release extracellular reactive oxygen species (eROS), which significantly contribute to the natural ROS pool and play a crucial role in metabolic interactions of bacteria with their environment. Understanding the behavior of eROS-generating bacteria and its environmental implications is of great importance in the cycling of biogeochemical elements, transformation of organic matter, and regulation of antibiotic resistance genes.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Ji-Dong Gu, Tim Ford, Bryce Mitton, Ralph Mitchell
Summary: Plastics and microplastics are widely present and accumulating in the environment, leading to increasing public attention. In addition to packaging plastics, materials from industries such as electronics, space and aviation are also accumulating, but receiving less attention. The production of degradable and biodegradable plastics is seen as a way to reduce environmental impacts, but enhancing the non-degradability of functional polymers is also a feasible option. Microbial colonization and deterioration pose significant challenges to these materials.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Justyna Bohacz, Michal Mozejko
Summary: This study evaluated the keratinolytic activity of 37 strains of Trichophyton ajelloi and found that pigmented strains isolated from loamy soil were more efficient in degrading native feather keratin, while non-pigmented strains isolated from chernozem showed better abilities. The keratinolytic activity increased over time, as evidenced by the increase in extracellular keratinase activity and release of soluble proteins and peptides. Protease activity peaked in the first 7 days and again on day 28 of culture. The release of ammonium and sulfate ions, associated with an increase in pH, reached its maximum on day 21. Three pigment-producing strains were among the most active in releasing large amounts of ammonium and sulfate ions. The biodegradation of feather waste by Trichophyton ajelloi strains can be used to produce fertilizers suitable for plants with high sulfur requirements.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Joseph M. Suflita, Brenda J. Little
Summary: This article reviews the major achievements of the International Biodeterioration & Biodegradation Society (IBBS) on its 50th anniversary and provides recommendations for addressing new challenges and developments based on personal experiences.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Zhenyan Lin, Tuo Jin, Xin Xu, Xiao Yin, Dan Zhang, Mengjiao Geng, Chunyu Pang, Gongwen Luo, Lizhi Xiong, Jianwei Peng, Jiangchi Fei
Summary: The incomplete recycle of residual mulch film (RMF) in recent years has led to an increase in plastic fragments in soil, posing a serious threat to the soil ecological environment. In this study, seven potential plastic-degrading microorganisms were screened and identified from film-mulched vegetable fields. The degradation ability experiments showed that both single strains and mixed strains demonstrated varying levels of degradation of RMF.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Tiina Belt, Michael Altgen, Muhammad Awais, Martin Nopens, Lauri Rautkari
Summary: This study investigated the degradation of heat-treated wood by brown rot fungi and found that the decay increased the hygroscopicity of wood in the decaying state. Furthermore, it was observed that heat-treated samples were more susceptible to fungal decay compared to untreated samples, which may be related to the increase in moisture content.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Marta Cicardi, Davide Bernasconi, Luca Martire, Linda Pastero, Giulia Caneva, Sergio E. Favero-Longo
Summary: This study investigated the phenomenon of Centimetric circular areas Uncolonized by Microbial Biofilms (CUMBs) on natural and heritage stone surfaces. The analysis revealed a compatibility in distribution and size between CUMBs and lichen thalli, suggesting a lichen origin for some CUMBs. Microscopic analysis also showed similar modifications in marble layers beneath CUMBs and lichens, indicating a possible alteration of stone properties by lichens.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
