Article
Ecology
Ali Mahmoodi, Mohammad Reza Alizadeh Kiapi, Hamidreza M. Nick
Summary: Adding nitrate or nitrite to seawater injections can mitigate the production of hydrogen sulfide in an oil reservoir. However, excessive or insufficient treatment may lead to increased production. The location of the hydrogen sulfide generation zone and its distance from production wells also play a significant role in production levels.
ECOLOGICAL MODELLING
(2023)
Article
Engineering, Environmental
Moein Jahanbani Veshareh, Jan Dolfing, Hamidreza M. Nick
Summary: The study highlights the importance of understanding souring rate, nitrate reduction rate, and pathways for efficient souring management. Incorporating thermodynamic dependent kinetic parameters such as growth yield and F-T significantly affects sulfate-reducing microorganisms. Experimental data shows that considering variable F-T can lead to better modeling in nitrate-based souring treatment.
Article
Biotechnology & Applied Microbiology
Moein J. Veshareh, Kasper U. Kjeldsen, Alyssa J. Findlay, Hamidreza M. Nick, Hans Roy, Angeliki Marietou
Summary: Microbial sulfate reduction is the main source of hydrogen sulfide in offshore oil reservoirs, with nitrate, nitrite, and perchlorate being potential inhibitors. Nitrate inhibits sulfide accumulation by promoting sulfate reduction and sulfide oxidation, while nitrite is the most efficient inhibitor. Further field scale studies are needed to confirm the effectiveness of perchlorate as a souring mitigation agent.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Energy & Fuels
Shuyuan Deng, Bo Wang, SanBao Su, Shanshan Sun, Yuehui She, Fan Zhang
Summary: This study investigated the field application of a bio-inhibitor (nitrate and nitrite injection) for souring control in an oilfield. The results showed that the bio-inhibitor effectively removed H2S from the injected water, leading to cost-effective treatments for souring control.
Article
Green & Sustainable Science & Technology
A. Mahmoodi, H. M. Nick
Summary: Seawater flooding as a secondary or tertiary oil recovery method may face challenges of scale deposition and reservoir souring. This study finds that scale formation has a minor impact on reservoir souring, but reservoir souring and nitrate treatment significantly influence scale formation. Moreover, more efficient nitrate treatment leads to a closer proximity of the hydrogen sulfide generation zone to the production well.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
Bo Wang, Shuyuan Deng, Sanbao Su, Shanshan Sun, Chao Chen, Hao Xu, Hongfei Ma, Ibrahim M. Banat, Yuehui She, Fan Zhang
Summary: Researchers simulated the inhibition of hydrogen sulfide (H2S) in the laboratory using water samples from injection wells in the Jianghan reservoir. The addition of NO3- and NO2- effectively reduced the levels of H2S and elemental sulfur. Nitrate-reducing bacteria (NRBs) suppressed the activity of sulfate-reducing bacteria (SRBs) through nitrite accumulation and competition for organic substrates. Sulfur-oxidizing bacteria were accumulated for souring control when SRBs activity could not be suppressed.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Erisvaldo B. de Jesus, Luiz R. P. de Andrade Lima
Summary: The study simulated the effect of molybdate ions in treating souring using different injection strategies, finding that the origin and composition of injection water influences the development and activity of sulfate-reducing bacteria, and that adding molybdate during secondary recovery is an effective way to prevent reservoir acidification.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Civil
Keith E. Schilling, Elliot Anderson, Matthew T. Streeter, Chuck Theiling
Summary: This study calculated the mass balance of annual and seasonal NO3-N concentration and load reductions for Lake Red Rock, a flood-control reservoir in Iowa. It was found that the reservoir removed an average of 7,379 Mg of NO3-N per year, accounting for 12.4% of the inputs. The annual NO3-N reduction in flood-control reservoirs in the Midwest is logarithmically related to the average annual water retention time.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Yunmeng Pang, Jianlong Wang, Shengjie Li, Guodong Ji
Summary: This study revealed that the addition of sulfide (S2-) enhanced the coupling of denitrification with sulfide oxidation, leading to a shift in nitrate reduction pathways in freshwater lake sediments. The enrichment of Thiobacillus, a sulfide-oxidizing denitrifier, was found to play a key role in driving sulfide-driven denitrification, with differences observed in lakes with varying inherent organic carbon and sulfate levels. Additionally, internal sulfate release was seen to promote cooperation between sulfide-oxidizing denitrifiers and sulfate reducers in freshwater environments.
ENVIRONMENTAL POLLUTION
(2021)
Article
Engineering, Environmental
Duk-Min Kim, Woong-Lim Lim, Dae-Gyu Im, Jung-Woo Hwang, Soonyoung Yu, Seong-Taek Yun, Jeong-Hee Kim
Summary: The fractionation behaviors of Cu and Zn isotopes were studied in groundwater contaminated with petroleum and treated by oxidation. The study assessed the isotopes of Cu, Zn, SSO4, and H2O2 in wells contaminated with total petroleum hydrocarbons (TPH) and treated with H2O2 in 2021 and 2022. The results suggested the occurrence of sulfate reduction and precipitation of Cu sulfides, while the Zn isotopic fingerprint of sulfide precipitation may have been masked by sorption. The use of Cu isotopes in redox reactions proved advantageous due to the wider range of Cu isotopes.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Wei Wang, Lei Zhao, Miao Yu, Tian -Ming Yin, Duu-Jong Lee, Nan-Qi Ren, Chuan Chen
Summary: This study investigated the effects of feeding gas type and N/S ratio on a novel SDMO system through batch tests. The results showed that increasing the N/S ratio decreased the nitrate removal efficiency but increased the DAMO/AD contribution. Using biogas as a feeding gas enhanced nitrate removal efficiency, and different H2S contents had varied effects on the microorganism community structure and functional genes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yu-Lin Han, Xian-Zhong Zhang, Hong-Bo Liu, Bruce E. Rittmann, He-Ping Zhao
Summary: This study presents a new technology that combines sulfate reduction with simultaneous nitrification and autotrophic denitrification. The integrated process effectively removes nitrogen and organics from saline wastewater with a low COD/N ratio, while minimizing the energy consumption, footprint, and sludge yield. By integrating an anaerobic membrane bioreactor (AnMBR) with a membrane aerated biofilm reactor (MABR), highly efficient sulfate reduction, autotrophic denitrification, and nitrification are achieved. The separate operation of the MABR achieves over 90% total nitrogen removal when the N/S ratio is controlled at 0.4 gN/gS.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Changzi Guo, Xuli Zhang, Wanqin Zhao, Yi Han, Liying Pei, Yinping Hou, Dangcong Peng
Summary: A sulfide autotrophic denitrification microbial fuel cell (MFC) was established to study the removal of nitrogen and sulfur and electricity generation. The results showed that simultaneous desulfurization and nitrate removal were feasible. Higher sulfide concentration favored electricity generation. Nitrate concentration had less effect on sulfide removal and electricity production. Lower external resistance improved nitrate removal efficiency. The microbial community structure differed between the anode and cathode chambers. This research provides a new idea and method for sulfur-and nitrogen-containing wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Microbiology
Danika Nicoletti, Mohita Sharma, Lisa M. Gieg
Summary: The study found that nitrate and nitrite can be used to inhibit oilfield souring, but may increase corrosion risk. Microbial communities on two FPSO vessels had similar compositions but different responses to nitrate and nitrite.
Article
Biotechnology & Applied Microbiology
Felix Kogler, Fabian S. F. Hartmann, Dirk Schulze-Makuch, Andrea Herold, Hakan Alkan, Nicole Dopffel
Summary: Molybdate has been proposed as an alternative SRM inhibitor for controlling microbial souring in the petroleum industry, but its efficiency and potential risks of souring should be carefully considered during field operations.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Biotechnology & Applied Microbiology
Federico Aulenta, Matteo Tucci, Carolina Cruz Viggi, Jan Dolfing, Ian M. Head, Amelia-Elena Rotaru
Summary: Direct interspecies electron transfer (DIET) via electrically conductive minerals can accelerate the anaerobic oxidation of petroleum hydrocarbons at contaminated sites, paving the way for the development of more effective bioremediation approaches.
MICROBIAL BIOTECHNOLOGY
(2021)
Article
Engineering, Environmental
Ying Xu, Thomas Curtis, Jan Dolfing, Yonghong Wu, Bruce E. Rittmann
Summary: Research findings suggest that the regulation of N-acyl-homoserine-lactones (AHLs) via quorum sensing signaling can optimize phosphorus (P) entrapment in microbial aggregates, promoting microbial growth and enhancing the community of polyphosphate-accumulating organisms (PAOs) to increase both intra-and extra-cellular P capture.
Article
Microbiology
Varada Khot, Jackie Zorz, Daniel A. Gittins, Anirban Chakraborty, Emma Bell, Maria A. Bautista, Alexandre J. Paquette, Alyse K. Hawley, Breda Novotnik, Casey R. J. Hubert, Marc Strous, Srijak Bhatnagar
Summary: CANT-HYD is a tool for identifying and predicting the hydrocarbon degradation potential of microbial genomes and metagenomes. It utilizes a HMM database containing 37 marker genes to identify understudied or overlooked hydrocarbon degradation potential. Additionally, it can predict hydrocarbon utilization in diverse environments by analyzing large metagenomic datasets.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Agricultural Engineering
Ying Xu, Philip G. Kerr, Jan Dolfing, Bruce E. Rittmann, Yonghong Wu
Summary: This study presents an approach for developing periphytic biofilm with AHLs stimulation and La loading to achieve efficient and stable phosphorus recovery from wastewater. The combination of AHLs stimulation and La loading achieved 99.0% P entrapment and a method for separate recovery of P and La from biofilms was developed.
BIORESOURCE TECHNOLOGY
(2022)
Editorial Material
Soil Science
Yonghong Wu, Pengfei Sun, Jan Dolfing, Chengrong Chen
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2022)
Article
Genetics & Heredity
Jianwei Zhang, Jan Dolfing, Wenjing Liu, Ruirui Chen, Jiabao Zhang, Xiangui Lin, Youzhi Feng
Summary: This study identified indicator microbiomes for soil fertility and crop production based on a continuous 20-year field study. The results highlight the potential of microorganisms in informing and maximizing the functions of future agroecosystems.
ENVIRONMENTAL MICROBIOME
(2022)
Article
Multidisciplinary Sciences
Xiyang Dong, Chuwen Zhang, Yongyi Peng, Hong-Xi Zhang, Ling-Dong Shi, Guangshan Wei, Casey R. J. Hubert, Yong Wang, Chris Greening
Summary: The authors investigate metagenomes and metatranscriptomes of diazotrophs from deep sea cold seep sediments, revealing greater phylogenetic and functional diversity than hitherto known.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Dong Wu, Jue Zhao, Yinglong Su, Mengjie Yang, Jan Dolfing, David W. Graham, Kai Yang, Bing Xie
Summary: This study investigated the presence of antibiotic resistance genes (ARGs) in the Taipu River catchment, a water source for a major drinking water reservoir in Shanghai. The results showed a significant decrease in ARG abundances downstream towards the reservoir, while the assembly of waterborne bacteria was influenced by temperature and dissolved oxygen conditions. The putative resistant pathogens carried mixtures of ARGs with high transmission probability, particularly with the dominant taxa in the microbial assembly.
Article
Engineering, Environmental
Yue Yi, Jan Dolfing, Ge Jin, XiaoYu Fang, WenHao Han, LaiYan Liu, YueQin Tang, Lei Cheng
Summary: In this study, the influence of ammonia on different methanogenic pathways was evaluated by culturing Methanosarcina barkeri with acetate, H2/CO2, and methanol. Aceticlastic methanogenesis was more sensitive to increased ammonia concentrations than hydrogenotrophic and methylotrophic methanogenesis. The results reveal the varying ammonia tolerances of M. barkeri under different methanogenic pathways, providing insights into the role of the thermodynamic potential of methanogenesis in ammonia stress tolerance and shedding light on the mechanism of ammonia inhibition on anaerobic digestion.
Article
Multidisciplinary Sciences
Sichu Wang, Pengfei Sun, Junzhuo Liu, Ying Xu, Jan Dolfing, Yonghong Wu
Summary: Periphytic biofilms (PB) at the soil-water interface contribute significantly to methane emissions from rice paddies, but the mechanisms underlying this process are not well understood. This study evaluated the environmental drivers affecting the distribution of methanogenic and methanotrophic communities in rice fields along an edaphoclimatic gradient. The study found that the composition and relative abundance of these communities at the soil-water interface were weakly driven by spatial distance, soil organic carbon, soil total nitrogen, and pH. The study also identified the role of extracellular polymeric substance released by PB in reducing inter/intra-generic interactions and enhancing resilience to edaphic environment changes.
Article
Agricultural Engineering
Nina Yan, Biao Hu, Zhiyu Zheng, Haiying Lu, Jingwen Chen, Xiaomei Zhang, Xizhi Jiang, Yonghong Wu, Jan Dolfing, Lei Xu
Summary: A method of preparing magnetic, recyclable biochar with minimal pore blockage was developed by loading ultrafine magnetite onto ball milled biochar and then milling it for a second time. The deposited magnetite did not significantly wrap the biochar, resulting in a decreased sorption performance. However, the extra milling step restored the surface functional groups and specific surface areas, leading to a 93.8% recovery adsorption of 84.6 +/- 2.5 mg/L on methylene blue. The recyclability of the material was not affected, and the adsorption was driven by multiple interactions. This twice-milled magnetic biochar is highly efficient for sustainable removal of aqueous contaminants.
BIORESOURCE TECHNOLOGY
(2023)
Article
Soil Science
Yuanyuan Bao, Jan Dolfing, Ruirui Chen, Zhongpei Li, Xiangui Lin, Youzhi Feng
Summary: Soil fertility affects microbial-driven plant residue decomposition and soil organic carbon formation. The composition and efficiency of bacterial communities are significantly influenced by soil fertility levels. High fertile soils select for fast but inefficient bacteria, while low fertile soils select for slow but efficient ones.
SOIL & TILLAGE RESEARCH
(2023)
Article
Ecology
Yongyi Peng, Zijian Lu, Donald Pan, Ling-Dong Shi, Zhao Zhao, Qing Liu, Chuwen Zhang, Kuntong Jia, Jiwei Li, Casey R. J. Hubert, Xiyang Dong
Summary: Through the study of active and extinct stages in the Haima cold seeps area, we found that deep sea cold seep sediments harbor novel, abundant, and diverse bacterial and archaeal viruses. The dynamics of host-virus interactions are determined by diverse antiviral defense systems across different microbial genomes. Cold seep viruses are predicted to have various adaptive strategies to persist in this environment. Extremely low nucleotide diversity is observed in cold seep viral populations, influenced by factors such as microbial host, sediment depth, and cold seep stage. Most cold seep viral genes are under strong purifying selection with trajectories depending on the activity of the cold seeps. This work sheds light on the environmental adaptation mechanisms and evolutionary patterns of viruses in the sub-seafloor biosphere.
Review
Microbiology
Maria Westerholm, Magdalena Calusinska, Jan Dolfing
Summary: This review summarizes discoveries in syntrophic propionate degradation research and highlights the importance of understanding the metabolic capabilities and cooperation mechanisms of syntrophic propionate-oxidizing bacteria (SPOB) for biotechnological applications and biogenic methane emissions. The review discusses the gene repertoire, metabolic pathways, and electron transfer mechanisms of SPOB, as well as the environmental conditions governing propionate oxidation in different ecosystems.
FEMS MICROBIOLOGY REVIEWS
(2022)
Article
Multidisciplinary Sciences
Sichu Wang, Pengfei Sun, Guangbin Zhang, Neil Gray, Jan Dolfing, Sofia Esquivel-Elizondo, Josep Penuelas, Yonghong Wu
Summary: This study evaluated the contribution of periphytic biofilm (PB) to CO2 and CH4 emissions from rice paddies and found that PB played a significant role in carbon fluxes. PB fixed CO2 and promoted aerobic CH4 oxidation during its growth phase, while it increased soil organic carbon availability and methanogenic microbial community growth during the decay phase, leading to increased CH4 emissions.