Article
Environmental Sciences
Xu Guo, Chun -Yu Lai, Erica M. Hartmann, He -Ping Zhao
Summary: Nitrate/nitrite-dependent anaerobic methane oxidation (n-DAMO) is a sustainable process for simultaneous removal of nitrogen and methane. This study found that heterotrophs co-existing with denitrifying anaerobic methanotrophs play an important role in the n-DAMO process. These heterotrophs utilize methane-derived intermediates produced by the methanotrophs for denitrification and biomass growth. The findings provide new insights for optimizing the n-DAMO process for nitrogen removal from wastewater.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Rayaan Harb, Dilan Lacin, Irmak Subasi, Tuba H. Erguder
Summary: The recently discovered process of denitrifying anaerobic methane oxidation (DAMO) connects the carbon and nitrogen biogeochemical cycles by linking the anaerobic oxidation of methane to denitrification. The DAMO process shows potential for reducing the greenhouse effect through the assimilation of dissolved methane, and offers a new perspective on denitrification through methane oxidation rather than organic matter. The two main microorganisms responsible for DAMO, M. oxyfera and M. nitroreducens, exist together in nature through a syntrophic relationship and may coexist with anaerobic ammonium oxidation (Anammox) bacteria, presenting opportunities for improved nitrogen removal systems and wastewater treatment alternatives.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Tianjing Shi, Xinying Liu, Yiting Xue, Fang He, Yan Dang, Dezhi Sun
Summary: In this study, it was found that applying potential significantly influenced the denitrifying anaerobic methane oxidation (DAMO) process. The optimal potential of +0.8 V increased the nitrite removal rate by 4.5 times and facilitated the enrichment of DAMO functional bacteria. Metabolomics analysis showed that applying potential affected the regulation of key metabolites related to metabolic pathways, leading to positive effects on DAMO process. Applying electric potential could be a useful strategy in methane and nitrogen removal.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Tianjing Shi, Xinying Liu, Yiting Xue, Fang He, Yan Dang, Dezhi Sun
Summary: The study found that applying a potential of +0.8 V significantly improved the efficiency of the denitrifying anaerobic methane oxidation process, increasing the rate of nitrite conversion to nitrogen and promoting the enrichment of DAMO functional bacteria. LC-MS metabolomics analysis showed that the regulation of key metabolites by applied potential was beneficial for enhancing the DAMO process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Na Xu, Min Liao, Yuqi Liang, Jiawen Guo, Yuhao Zhang, Xiaomei Xie, Qiyan Fan, Yunqiang Zhu
Summary: A novel heterotrophic nitrification and aerobic denitrification (HNAD) bacteria, Bacillus thuringiensis strain WXN-23, was isolated from husk feed filtrate of a pig farm. It could efficiently remove nitrogen in simulated wastewater, adapt to low C/N ratio conditions, and showed a nitrogen balance efficiency of 63.5% in the form of N-2. The most optimal conditions for total nitrogen removal were shaking speed of 126.89 r/min, C/N ratio of 5.91, temperature of 32.81. C, and pH value of 8.17. The nitrification-denitrification metabolic pathway under aerobic conditions was determined, and strain WXN-23 exhibited high removal efficiencies for TN, NH4+-N, NO3--N and NO2--N in wastewater treatment.
ENVIRONMENTAL RESEARCH
(2021)
Article
Agricultural Engineering
Min Deng, Xiaoli Zhao, Yeerken Senbati, Kang Song, Xugang He
Summary: Pseudomonas sp. DM02 demonstrates efficient nitrogen removal capabilities in aquaculture wastewater treatment, with quick removal of total ammonia nitrogen and nitrates. Optimal environmental conditions and the presence of functional genes play a crucial role in water quality treatment.
BIORESOURCE TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Hualei Yang, Xuechu Chen, Chunsong Zhang, Mingming Zhao, Xinmeng Zhao, Danielle C. Perry, Jianwu Tang
Summary: Coastal wetlands are important for nitrogen removal and carbon sequestration, and CH4 emissions can enhance denitrification through DAMO reaction.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Biotechnology & Applied Microbiology
Jing Ding, Fan Qin, Changxin Li, Mingfang Tang, G. Daniel Sheng
Summary: The study examined the survival characteristics of DAMO microbes in Taihu Lake and found that DAMO bacteria and archaea displayed niche differentiation and different survival strategies. The abundance and association network of DAMO microbes varied among different nutrient regions, with DAMO bacteria acting as connectors in the mildly eutrophic region. The study expands our understanding of the ecological functions of DAMO microbes in freshwater environments.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Biotechnology & Applied Microbiology
Jin Qu, Ruojin Zhao, Yinyan Chen, Yiyi Li, Peng Jin, Zhanwang Zheng
Summary: A novel bacteria strain LT-01 with cold tolerance was isolated in this study, showing high efficiency in nitrogen removal at low temperatures, which indicates its potential application in sewage treatment in cold regions.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2022)
Review
Environmental Sciences
Yunmeng Pang, Jianlong Wang
Summary: This paper discusses the issue of nitrate pollution in water and wastewater, as well as the use of various electron donors for biological denitrification. Depending on the types of electron donors, denitrification can be classified into heterotrophic and autotrophic denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Bohui Wei, Xiao Luo, Wenkai Ma, Pengyi Lv
Summary: In this study, a cold-resistant Rhizobium strain W57 was isolated and identified, showing significant de-nitrogenation efficiency at 15℃. The nitrogen metabolic pathways and enzyme activities were determined for strain W57. The findings suggest that W57 has potential application in cold sewage treatment.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
Hoang Dung Nguyen, Sandhya Babel
Summary: This study critically reviews the nitrogen removal process and influencing factors in various MFC configurations, highlighting shortcut nitrification-autotrophic denitrification and heterotrophic anodic denitrification as promising options, although further evaluation on efficiency and gas emissions is needed. The selection of MFC configuration depends on the nature of the wastewater.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Yumeng Xie, Xiangli Tian, Yang Liu, Kun Zhao, Yongmei Li, Kai Luo, Bo Wang, Shuanglin Dong
Summary: The nitrogen removal performance and mechanisms of Bacillus subtilis H1 isolated from a mariculture environment were investigated. The results showed that strain H1 efficiently removed different forms of nitrogen and the nitrogen assimilation and dissimilation pathways were clarified. These findings demonstrate the potential application of B. subtilis H1 in treating mariculture wastewater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Environmental Sciences
Jing Ding, Raymond Jianxiong Zeng
Summary: The current research summarizes the progress on DAMO archaea and the catalyzed nitrate-dependent anaerobic methane oxidation, including aspects such as laboratory enrichment, environmental distribution, and metabolic mechanism. It is shown that appropriate inocula and enrichment parameters are crucial for DAMO activity, but there is a lack of studies on the environmental distribution and physiological metabolism of DAMO archaea.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Fabio Manca, Carla Wegscheidl, Rhianna Robinson, Suzette Argent, Christopher Algar, Daniele De Rosa, Matthew Griffiths, Fiona George, David Rowlings, Louis Schipper, Peter Grace
Summary: This study trialed different designs of woodchip bioreactors to quantify their NO3- removal performance in sugar cane farms in North Queensland. The results showed that the bioreactors were effective at reducing NO3- runoff to the Great Barrier Reef, with the beds exhibiting a higher NO3- removal rate compared to the wall.
Article
Engineering, Environmental
Kunlun Yang, Chuchen Zhou, Cheng Li, Shuo Dou, Xiaogang Li, Xin Wang, Xinhua Xu
Summary: The introduction of Si doping in Fe oxide composites inhibits crystal growth, reduces particle size, and decreases aggregation of Fe oxide, leading to increased surface area and exposed hydroxyl groups to enhance Sb(V) removal capacity. Optimal SFOC10 with Fe/Si molar ratio of 10:1 showed the highest surface area, maximum Sb(V) removal capacity, and better phase stability during cyclic adsorption-desorption process, making it effective for removing Sb(V) from real textile wastewater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Hu Zhou, Cheng-cheng Ji, Jing-Qiang Li, Yun-Xia Hu, Xin-Hua Xu, Yue An, Li-Hua Cheng
Summary: This study investigated the membrane fouling mechanism in microalgal FO dewatering process and found that algal broth resulted in the fastest flux decline. A competitive adsorption phenomenon between cells and soluble algal products was observed in the feed solution of Chlorella vulgaris. The XDLVO theory was effective in predication of fouling potential for individual and combined feed solutions.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Environmental
Zhen Cao, Hao Li, Gregory Lowry, Xiaoyang Shi, Xiangcheng Pan, Xinhua Xu, Graeme Henkelman, Jiang Xu
Summary: This study demonstrates the rapid dechlorination and relatively fast defluorination abilities of SNZVI nanoparticles synthesized via a modified post-sulfidation method, providing a new potential for groundwater remediation of fluorinated contaminants. The presence of Cl atoms in florfenicol increases the surface chemical reactivity for defluorination, highlighting the importance of understanding the mechanistic insights for developing new materials. The results suggest that SNZVI could be a promising technology for in situ groundwater treatment due to its enhanced reactivity and high efficiency compared to Fe-0-based technologies.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Yuxiang Zhao, Jiajie Hu, Weiling Yang, Jiaqi Wang, Zhongjun Jia, Ping Zheng, Baolan Hu
Summary: The discovery of complete ammonia oxidizer (comammox) was a breakthrough in nitrification research. Comammox bacteria can metabolize urea and have higher nitrite tolerance, indicating potential niche differentiation when using different nitrogen sources. Using nitrite can increase the relative abundance of comammox, while using urea can increase the quantity of comammox.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Weijian Xu, Xinyi Hu, Yutao Shen, Hao Yu, Yinghong Zhu, Yanning Tong, Chaofeng Shen, Xinhua Xu, Liping Lou
Summary: This study found that high-temperature BC promotes electron release and [H] generation, enhancing electron utilization efficiency and promoting the dechlorination reaction of PCB1 on both nZVI/Pd particles and BC surfaces.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Jiasheng Zhou, Zimo Lou, Zheni Wang, Chuchen Zhou, Cheng Li, Shams Ali Baig, Xinhua Xu
Summary: The functionalization of Pd/GAC with CTAB enhances the degradation rate of 2,4-DCBA, but excessive CTAB loading can decrease the removal efficiency of dechlorinated products. Density functional theory (DFT) calculations support that CTAB improves the adsorption capacity of the catalyst and selective adsorption behavior of 2,4-DCBA, leading to accelerated degradation rates.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Yuxiang Zhao, Jiaqi Wang, Yan Liu, Ping Zheng, Baolan Hu
Summary: In high pH conditions, a bioreactor was able to achieve efficient removal of sulfide, with Thiobacillus acting as the dominant species and showing close interactions with other bacteria. The results indicate that microbial interaction can enhance desulfurization efficiency.
ENVIRONMENTAL RESEARCH
(2021)
Article
Anatomy & Morphology
Shah Dehrai Bibi, Shams Ali Baig, Iftikhar Zeb, Maroof Ali, Dilawar Farhan Shams, Javed Nawab, Ina Yosifova Aneva, Hidayat Hussain, Xinhua Xu
Summary: This study investigated indoor soot particles released from firewood, cow dung, and bagasse burning in selected rural areas of Khyber Pakhtunkhwa province in Pakistan. Results showed diverse compositions and surface areas of soot particles from different fuel sources, suggesting potential environmental and health implications. The findings indicate that current household fuel combustion practices significantly contribute to increased particulate matter in the atmosphere and may enhance climate change and related disasters in northern Pakistan.
MICROSCOPY RESEARCH AND TECHNIQUE
(2021)
Article
Environmental Sciences
Jiajie Hu, Yuxiang Zhao, Xiangwu Yao, Jiaqi Wang, Ping Zheng, Chuanwu Xi, Baolan Hu
Summary: The study revealed the significant role of comammox Nitrospira in soil nitrification, especially in acid soils, showing a positive correlation between their abundance and nitrification potential, dominating in most soil samples.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Yuanli Liu, Cheng Li, Zimo Lou, Chuchen Zhou, Kunlun Yang, Xinhua Xu
Summary: The study proposed a combination of PFS and PAC to remove ppb-level Sb(V) from textile wastewater, achieving a maximum removal efficiency of 95.0%, reducing turbidity, and increasing active adsorption sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Environmental Sciences
Jiaqi Wang, Xiangwu Yao, Zhongjun Jia, Lizhong Zhu, Ping Zheng, Boran Kartal, Baolan Hu
Summary: This study investigated the influence of nitrogen input on the abundance and activity of denitrifying methanotrophs. The results showed that nitrogen input increased the abundance of these microorganisms and enhanced their contribution to methane emission reduction.
ENVIRONMENTAL POLLUTION
(2022)
Article
Microbiology
Meng Zhou, Zishu Liu, Jiaqi Wang, Yuxiang Zhao, Baolan Hu
Summary: In this study, soil samples were collected at a coking site to investigate the degradation of polycyclic aromatic hydrocarbons (PAHs) using a combination of molecular ecology networking, metagenomics, and genome assembly. The dominant and persistent microbe, Sphingomonas, was identified and its adaptation strategies and genomic features were analyzed. The study revealed that Sphingomonas plays a crucial role in the degradation of PAHs and demonstrated its competitive advantage in the soil environment.
Article
Environmental Sciences
Jiaqi Wang, Mingyue He, Yufen Li, Fang Ma, Ping Zheng, Baolan Hu
Summary: This study successfully achieved rapid enrichment of denitrifying methanotrophs using a series hollow-fiber membrane biofilm reactor for 90 days. The results showed that the series reactor effectively counteracted the inhibitory effect of dissolved oxygen on denitrifying methanotrophic archaea, resulting in a high growth rate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Zishu Liu, Yuxiang Zhao, Baofeng Zhang, Jiaqi Wang, Lizhong Zhu, Baolan Hu
Summary: Soil is the major reservoir of antibiotic resistance genes (ARGs), particularly multidrug efflux pump genes, which have raised concerns due to their high prevalence in natural soil ecosystems. This study examined the influence of soil pH on the selection and composition of multidrug efflux pump genes in soil resistomes. The findings indicate that acidic soil environments significantly enrich multidrug efflux pump genes, reflecting the benefits of high soil proton activity on these genes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Zhen Cao, Hao Li, Shuangyu Zhang, Yunxuan Hu, Jiang Xu, Xinhua Xu
Summary: The amount of NaBH4 used in the liquid-phase reduction method can significantly impact the properties of SNZVI, such as the S/Fe molar ratio and Fe-0 content. These properties are correlated to the reactivity and selectivity of SNZVI in trichloroethylene dechlorination reactions.
ENVIRONMENTAL SCIENCE-NANO
(2021)