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Chaudhary DK, Seo D, Han S, Hong Y. Distribution of mercury in modern bottom sediments of the Beaufort Sea in relation to the processes of early diagenesis: Microbiological aspect. Mar Pollut Bull 2024; 202:116300. [PMID: 38555803 DOI: 10.1016/j.marpolbul.2024.116300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 02/23/2024] [Accepted: 03/24/2024] [Indexed: 04/02/2024]
Abstract
This study investigated the contents of total mercury (THg), trace metals, and CH4 and determined the signature microbes involved in various biogeochemical processes in the sediment of the Canadian Beaufort Sea. The THg ranged between 32 and 63 μg/kg and the trace metals such as Fe, Al, Mn, and Zn were significant in distributions. The pH, SO42-, Fe2+, and redox proxy metals were crucial factors in the spatial and vertical heterogeneity of geochemical distributions. CH4 was detected only at the mud volcano site. Microbial analyses identified Clostridium, Desulfosporosinus, Desulfofustis, and Desulftiglans as the predominant Hg methylators and sulfate reducers; Nitrosopumilus and Hyphomicrobium as the major nitrifiers and denitrifiers; Methanosarcina and Methanosaeta as keystone methanogens; and Methyloceanibacter and Methyloprofundus as signature methanotrophs. Altogether, this study expands the current understanding of the microbiological and geochemical features and could be helpful in predicting ecosystem functions in the Canadian Beaufort Sea.
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Affiliation(s)
- Dhiraj Kumar Chaudhary
- Department of Environmental Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong City 30019, Republic of Korea
| | - DongGyun Seo
- Department of Environmental Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong City 30019, Republic of Korea
| | - Seunghee Han
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Gwangju 61005, Republic of Korea
| | - Yongseok Hong
- Department of Environmental Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong City 30019, Republic of Korea.
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Tran Thi Viet N, Vu DC, Duong TH. Effect of Hydraulic retention time on performance of anaerobic membrane bioreactor treating slaughterhouse wastewater. Environ Res 2023; 233:116522. [PMID: 37392825 DOI: 10.1016/j.envres.2023.116522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/07/2023] [Accepted: 06/27/2023] [Indexed: 07/03/2023]
Abstract
Slaughterhouse wastewater is a major environmental concern in many Vietnamese cities due to its high organic content and unpleasant odor. This study aimed to evaluate performance of a submerged flat sheet Anaerobic membrane bioreactor (AnMBR) system at different hydraulic retention time (HRT, 8-48 h) treating wastewater from a slaughterhouse in Hanoi City (Vietnam) at ambient temperature. The wastewater characteristics were as follows: chemical oxygen demand (COD) of 910 ± 171 mg/L; suspended solids (SS) of 273 ± 139 mg/L; and total nitrogen (T-N) of 115 ± 31 mg/L. The AnMBR system achieved high removal efficiencies for SS (99%) and COD (>90%) at an optimum HRT of 24 h. The biomethane yield reached 0.29 NL CH4/g CODinf. Importantly, the system maintained stable operation without flux decay and membrane fouling. HRT longer than 24 h could offer the better effluent quality without an increase in transmembrane pressure (TMP); however, it led to a lower methane production rate. Shorter HRT of 8-12 h caused a high TMP over -10 kPa, posing a risk for membrane fouling and biomass loss during cleaning, thus resulting in a low methane production. Our results suggest that AnMBR can be a reliable technology for wastewater treatment, reuse and energy recover from slaughterhouse wastewater in Vietnam and other similar climate countries.
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Affiliation(s)
- Nga Tran Thi Viet
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung, Hanoi, Viet Nam.
| | - Duc Canh Vu
- Department of Urban Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
| | - Thu Hang Duong
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung, Hanoi, Viet Nam.
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Hu L, He X, He J, Zhu J. Adsorption and photocatalytic conversion of ethyl mercaptan to diethyl disulfide on Fe 2O 3-loaded HNbMoO 6 nanosheet. Environ Sci Pollut Res Int 2022; 29:75417-75430. [PMID: 35653023 DOI: 10.1007/s11356-022-21146-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Ethyl mercaptans which commonly exist in natural gas need to be removed due to their toxic, odorous, and corrosive properties. Herein, a novel Fe2O3-modified HNbMoO6 nanosheet catalyst (Fe2O3@e-HNbMoO6) was prepared by an exfoliation-impregnation method for the ethyl mercaptans removal. In the heterojunction catalyst, e-HNbMoO6 can be excited by visible light to generate the photogenic charge and has certain adsorption property for ethyl mercaptan with hydrogen bonding (Nb-OH or Mo-OH as the hydrogen bonding donor); Fe2O3 plays the role of accelerating photogenerated electrons and holes, and enhancing the adsorption of ethyl mercaptan with another hydrogen bonding (Fe-OH as the hydrogen bonding donor and receptor). Results showed that the adsorption capacity of Fe2O3@e-HNbMoO6 is 69.9 μmol/g for ethyl mercaptan. In addition, the photocatalytic conversion efficiency of ethyl mercaptan to diethyl disulfide is nearly 100% and it is higher than that of the other Nb-Mo based photocatalysts, such as LiNbMoO6, Fe1/3NbMoO6, Ce1/3NbMoO6, TiO2-HNbMoO6, e-HNbMoO6, CeO2@e-HNbMoO6, and Ag2O@e-HNbMoO6. Under the experimental conditions, the photocatalytic conversion efficiency is greater than the adsorption efficiency over Fe2O3@e-HNbMoO6, and there is no ethyl mercaptan output in the process of adsorption and photocatalytic conversion. Fe2O3@e-HNbMoO6 heterojunction catalyst has practical value and reference significance for purifying methane gas and enhancing photocatalytic conversion of ethyl mercaptan.
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Affiliation(s)
- Lifang Hu
- School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, China.
- Institute of Environment-friendly Materials and Occupational Health, Anhui University of Science and Technology, Wuhu, 241003, China.
| | - Xin He
- School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, China
| | - Jie He
- School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, China
| | - Jichao Zhu
- Analytical and Testing Center, Anhui University of Science and Technology, Huainan, 232001, China
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Ganesan S, Limphattharachai S, Chawengkijwanich C, Liu Y, Janjaroen D. Influence of salinity on biofilm formation and COD removal efficiency in anaerobic moving bed biofilm reactors. Chemosphere 2022; 304:135229. [PMID: 35688188 DOI: 10.1016/j.chemosphere.2022.135229] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 05/15/2022] [Accepted: 06/02/2022] [Indexed: 05/12/2023]
Abstract
Anaerobic digestion is widely used for wastewater treatment, but this approach often relies on microbial communities that are adversely affected by high-salinity conditions. This study investigated the applicability of an anaerobic moving bed biofilm reactor (AMBBR) to treating high-salinity wastewater. The removal performance and microbial community were examined under salinity conditions of 1000-3000 mg/L, and a soluble chemical oxygen demand (sCOD) removal efficiency of up to 8% ± 2.74% was achieved at high-salinity. Scanning electron microscopy showed that microorganisms successfully attached onto the polyvinyl alcohol gel carrier, and the extracellular polymeric substances on the biofilm increased at higher salt concentrations. The AMBBR also maintained traditionally accepted levels of total alkalinity and volatile fatty acids for stable wastewater processing under these operating conditions. High-throughput sequencing indicated that Desulfomicrobium and three methanogenic groups were the dominant contributors to sCOD removal. Overall, the results showed that the AMBBR can successfully treat fish factory wastewater under varying salinity conditions.
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Affiliation(s)
- Sunantha Ganesan
- Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Supanun Limphattharachai
- Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand.
| | | | - Yuanyuan Liu
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China.
| | - Dao Janjaroen
- Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand; Research Network of NANOTEC-CU on Environment, Bangkok, 10330, Thailand; Research Unit Control of Emerging Micropollutants in Environment, Chulalongkorn University, Bangkok, Thailand.
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Massey BT, Wald A. Small Intestinal Bacterial Overgrowth Syndrome: A Guide for the Appropriate Use of Breath Testing. Dig Dis Sci 2021; 66:338-347. [PMID: 33037967 DOI: 10.1007/s10620-020-06623-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/16/2020] [Indexed: 02/07/2023]
Abstract
The increased availability of noninvasive breath tests, each with limitations, has led to widespread testing for small intestinal bacterial overgrowth (SIBO) in patients with non-specific gastrointestinal complaints. The lactulose breath test (LBT) is based upon an incorrect premise and therefore incorrect interpretations which has resulted in the over-diagnosis of SIBO and the excessive use of antibiotics in clinical practice. Despite limitations, the glucose breath test (GBT) should be exclusively employed when considering SIBO in appropriately chosen patients. This review suggests guidelines for the optimal use and appropriate interpretation of the GBT for suspected SIBO. The LBT should be discarded from future use, and the literature based upon the LBT should be discounted accordingly.
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Affiliation(s)
- Benson T Massey
- Division of Gastroenterology and Hepatology, Medical College of Wisconsin, 900 North 92nd Street, Milwaukee, WI, USA
| | - Arnold Wald
- Division of Gastroenterology and Hepatology, University of Wisconsin School of Medicine and Public Health, 1685 Highland Ave, Madison, WI, 53705-2281, USA.
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Navarro RR, Otsuka Y, Matsuo K, Sasaki K, Sasaki K, Hori T, Habe H, Nakamura M, Nakashimada Y, Kimbara K, Kato J. Combined simultaneous enzymatic saccharification and comminution (SESC) and anaerobic digestion for sustainable biomethane generation from wood lignocellulose and the biochemical characterization of residual sludge solid. Bioresour Technol 2020; 300:122622. [PMID: 31891856 DOI: 10.1016/j.biortech.2019.122622] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/10/2019] [Accepted: 12/12/2019] [Indexed: 06/10/2023]
Abstract
Simultaneous enzymatic saccharification and comminution (SESC) was used for large-scale anaerobic digestion of wood lignocellulose to generate methane and unmodified lignin. During SESC, 10% aqueous mixture of powdered debarked wood from various species was subjected to bead milling with hydrolytic enzymes to generate particles below 1 μm. This slurry was directly used as a cosubstrate for anaerobic digestion in a 500 L stirred-tank reactor. Temperature and hydraulic retention time (HRT) were maintained at 50 °C and 30 days, respectively. At stable operation periods, an average yield of 224 L of methane per kg of cedar was attained. Comparable yields were achieved with red pine, elm, oak, and cedar bark. High-throughput microbial analysis established the presence of a relevant community to support the elevated level of methane production. The stability of the unmodified lignin in anaerobic digestion was also confirmed, allowing for its recovery as an important by-product.
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Affiliation(s)
- Ronald R Navarro
- Microbial Technology Laboratory, Department of Forest Resource Chemistry, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan
| | - Yuichiro Otsuka
- Microbial Technology Laboratory, Department of Forest Resource Chemistry, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan
| | - Kenji Matsuo
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
| | - Kei Sasaki
- Departmemt of Food, Agriculture and Bio-Recycling, Faculty of Engineering, Hiroshima Kokusai Gakuin University, 6-20-1 Nakano Aki-ku, Hiroshima 739-0321, Japan
| | - Ken Sasaki
- Departmemt of Food, Agriculture and Bio-Recycling, Faculty of Engineering, Hiroshima Kokusai Gakuin University, 6-20-1 Nakano Aki-ku, Hiroshima 739-0321, Japan
| | - Tomoyuki Hori
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan
| | - Hiroshi Habe
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan
| | - Masaya Nakamura
- Microbial Technology Laboratory, Department of Forest Resource Chemistry, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan
| | - Yutaka Nakashimada
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
| | - Kazuhide Kimbara
- Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University, Naka-ku, Hamamatsu 432-8561, Japan
| | - Junichi Kato
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
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Kim K, Choi D, Im S. Understanding the effect of methane gas sensitivity using ultrasonic sensors and multi-matching layers inside a natural gas vehicle tank. Ultrasonics 2019; 99:105970. [PMID: 31394480 DOI: 10.1016/j.ultras.2019.105970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/24/2019] [Accepted: 07/26/2019] [Indexed: 06/10/2023]
Abstract
This research paper is the experimental study to investigate the effect of ultrasound sensitivity in the pure methane gas space as the pressure and sensor distance increases. We offer the solution to overcome the low sensitivity characteristics of ultrasonic sensors in the methane gas space. This proposal shows the physical characteristics analyzed with self-induced vibration, beam pattern, amplitude, attenuation, and Gaussian distribution validation in CH4 gas space. An ultrasonic sensor is designed with PbTio3 material of an MS-50 PTZ. The signal processing analysis system (APAS) is composed of the mechanical and controlling sections including three mass flow controllers, an air cylinder, safety valves, three pressure regulators, a CVC, ultrasound sensors, and two gas tanks (air and CH4). The experiment is performed in a wide range of the initial conditions, i.e., supplying voltage of 25 V, current of 0.2 A, pulse rate of 7 Hz, measuring distance of 0.32 to 1.02 m, resonance frequency of 57.3 Hz, ambient temperature of 296 K, and pressure increases of 1, 2, 3 and 4 bar. The ultrasonic sensitivity of a sensor (T: EVA and R: EVA) significantly enhanced the acoustic impedance in a methane gas space as pressure increases. It is verified that the sensitivity effect of an ultrasonic sensor used with ethylene vinyl acetate (EVA) matching layer is higher in the methane gas space than a chemical wood (CW) matching layer. Consequently, the effect of gas sensitivity computed by a GDA including the width (W), area (A), and height (H) is enhanced by an EVA sensor in comparison to other Models.
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Affiliation(s)
- Kwonse Kim
- Mechanical Engineering Department, Mississippi State University, Starkville, MS 39762, USA
| | - Dooseuk Choi
- Mechanical & Automotive Engineering Division, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungnam 31080, Republic of Korea
| | - Seokyeon Im
- Automotive Engineering Department, Tongmyong University, 428, Sinseon-ro, Nam-gu, Busan 48520, Republic of Korea.
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