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Ishizawa H, Ogata Y, Hachiya Y, Tokura KI, Kuroda M, Inoue D, Toyama T, Tanaka Y, Mori K, Morikawa M, Ike M. Enhanced biomass production and nutrient removal capacity of duckweed via two-step cultivation process with a plant growth-promoting bacterium, Acinetobacter calcoaceticus P23. CHEMOSPHERE 2020; 238:124682. [PMID: 31524619 DOI: 10.1016/j.chemosphere.2019.124682] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 08/14/2019] [Accepted: 08/25/2019] [Indexed: 05/27/2023]
Abstract
Plant growth-promoting bacteria (PGPB) are considered a promising tool to improve biomass production and water remediation by the aquatic plant, duckweed; however, no effective methodology is available to utilize PGPB in large hydroponic systems. In this study, we proposed a two-step cultivation process, which comprised of a "colonization step" and a "mass cultivation step," and examined its efficacy in both bucket-scale and flask-scale cultivation experiments. We showed that in the outdoor bucket-scale experiments using three kinds of environmental water, plants cultured through the two-step cultivation method with the PGPB strain, Acinetobacter calcoaceticus P23, yielded 1.9 to 2.3 times more biomass than the control (without PGPB inoculation). The greater nitrogen and phosphorus removals compared to control were also attained, indicating that this strategy is useful for accelerating nutrient removal by duckweed. Flask-scale experiments using non-sterile pond water revealed that inoculation of strain P23 altered duckweed surface microbial community structures, and the beneficial effects of the inoculated strain P23 could last for 5-10 d. The loss of the duckweed growth-promoting effect was noticeable when the colonization of strain P23 decreased in the plant. These observations suggest that the stable colonization of the plant with PGPB is the key for maintaining the accelerated duckweed growth and nutrient removal in this cultivation method. Overall, our results suggest the possibility of an improved duckweed production using a two-step cultivation process with PGPB.
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Affiliation(s)
- Hidehiro Ishizawa
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yuka Ogata
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yoshiyuki Hachiya
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Ko-Ichiro Tokura
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masashi Kuroda
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Daisuke Inoue
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tadashi Toyama
- Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan
| | - Yasuhiro Tanaka
- Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan
| | - Kazuhiro Mori
- Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan
| | - Masaaki Morikawa
- Division of Biosphere Science, Graduate School of Environmental Science, Hokkaido University, Kita-10 Nishi-5, Kita-ku, Sapporo, 060-0810, Japan
| | - Michihiko Ike
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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Inoue D, Fukuyama A, Ren Y, Ike M. Rapid enrichment of polyhydroxyalkanoate-accumulating bacteria by the aerobic dynamic discharge process: Enrichment effectiveness, polyhydroxyalkanoate accumulation ability, and bacterial community characteristics in comparison with the aerobic dynamic feeding process. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.biteb.2019.100276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhang Y, Kuroda M, Nakatani Y, Soda S, Ike M. Removal of selenite from artificial wastewater with high salinity by activated sludge in aerobic sequencing batch reactors. J Biosci Bioeng 2019; 127:618-624. [DOI: 10.1016/j.jbiosc.2018.11.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 11/01/2018] [Accepted: 11/02/2018] [Indexed: 10/27/2022]
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Angell IL, Hanssen JF, Rudi K. Prokaryote species richness is positively correlated with eukaryote abundance in wastewater treatment biofilms. Lett Appl Microbiol 2017; 65:66-72. [PMID: 28418627 DOI: 10.1111/lam.12746] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 04/10/2017] [Accepted: 04/11/2017] [Indexed: 12/13/2022]
Abstract
Biological treatment represents a key step in nutrient removal from wastewater. Until now these process has mainly been considered prokaryotic, with the interactions between prokaryotes and eukaryotes not being properly explored. We therefore investigated the co-occurrence of eukaryotes and prokaryotes in biological nitrogen removal biofilms. We found that biofilms in the nitrifying reactor contained the highest diversity and abundance of both prokaryotes and eukaryotes, with nearly three times higher prokaryote species richness than for the denitrifying reactor. The positive associations between eukaryote abundance and prokaryote diversity could potentially be explained by mutualism - and/or predator/prey interactions. Further mechanistic insight, however, is needed to determine the main diversifying mechanisms. In summary, eukaryote and prokaryote interactions seem to play a fundamental yet underexplored role in biological wastewater treatment. SIGNIFICANCE AND IMPACT OF THE STUDY Eukaryote and prokaryote interactions may play an important role in wastewater treatment. This study found that prokaryote species richness was nearly three times higher in the aerobe nitrification than in an anaerobe denitrification reactor, coinciding with the highest level of eukaryotes. This knowledge can be important in process control, and potentially in the development of novel approaches based on nitrate accumulating denitrifying eukaryotes.
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Affiliation(s)
- I L Angell
- Department of Chemistry, Biotechnology and Food Science, Norweigan University of Life Sciences, Ås, Norway
| | - J F Hanssen
- Department of Chemistry, Biotechnology and Food Science, Norweigan University of Life Sciences, Ås, Norway
| | - K Rudi
- Department of Chemistry, Biotechnology and Food Science, Norweigan University of Life Sciences, Ås, Norway
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Yuan L, Zhi W, Liu Y, Smiley E, Gallagher D, Chen X, Dietrich AM, Zhang H. Degradation of cis- and trans-(4-methylcyclohexyl) methanol in activated sludge. JOURNAL OF HAZARDOUS MATERIALS 2016; 306:247-256. [PMID: 26745518 DOI: 10.1016/j.jhazmat.2015.12.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 11/30/2015] [Accepted: 12/11/2015] [Indexed: 06/05/2023]
Abstract
Crude (4-methylcyclohexyl)methanol (MCHM) caused extensive contamination of drinking water, wastewater, and the environment during the 2014 West Virginia Chemical Spill. However, information related to the environmental degradation of cis- and trans-4-MCHM, the main components of the crude 4-MCHM mixture, remains largely unknown. This study is among the first to investigate the degradation kinetics and transformation of 4-MCHM isomers in activated sludge. The 4-MCHM loss was mainly due to biodegradation to form carbon dioxide (CO2), plus acetic, propionic, isobutyric, and isovaleric acids with little contribution from adsorption. The biodegradation of 4-MCHM isomers followed the first-order kinetic model with half-lives higher than 0.50 days. Nitrate augmented the degradation of 4-MCHM isomers, while glucose and acetate decreased their degradation. One 4-MCHM-degrading bacterium isolated from activated sludge was identified as Acinetobacter bouvetii strain EU40 based on 16S rRNA gene sequences. This study will enhance the prediction of the environmental fate of 4-MCHM in water treatment systems.
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Affiliation(s)
- Li Yuan
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA; College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Wei Zhi
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA
| | - Yangsheng Liu
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Elizabeth Smiley
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA
| | - Daniel Gallagher
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA
| | - Xi Chen
- Department of Earth and Environmental Engineering, Columbia University, New York 10027, USA
| | - Andrea M Dietrich
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA
| | - Husen Zhang
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA.
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Changes in bacterial community structure in a full-scale membrane bioreactor for municipal wastewater treatment. J Biosci Bioeng 2016; 122:97-104. [PMID: 26811223 DOI: 10.1016/j.jbiosc.2015.12.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 11/27/2015] [Accepted: 12/21/2015] [Indexed: 11/23/2022]
Abstract
This study investigated changes in the structure and metabolic capabilities of the bacterial community in a full-scale membrane bioreactor (MBR) treating municipal wastewater. Microbial monitoring was also conducted for a parallel-running conventional activated sludge (CAS) process treating the same influent. The mixed-liquor suspended solid concentration in the MBR reached a steady-state on day 73 after the start-up. Then the MBR maintained higher rates of removal of organic compounds and nitrogen than the CAS process did. Terminal restriction fragment length polymorphism analysis revealed that the bacterial community structure in the MBR was similar to that in the CAS process at the start-up, but it became very different from that in the CAS process in the steady state. The bacterial community structure of the MBR continued to change dynamically even after 20 months of the steady-state operation, while that of the CAS process was maintained in a stable condition. By contrast, Biolog assay revealed that the carbon source utilization potential of the MBR resembled that of the CAS process as a whole, although it declined transiently. Overall, the results indicate that the bacterial community of the MBR has flexibility in terms of its phylogenetic structure and metabolic activity to maintain the high wastewater treatment capability.
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Sakai K, Miyake S, Iwama K, Inoue D, Soda S, Ike M. Polyhydroxyalkanoate (PHA) accumulation potential and PHA-accumulating microbial communities in various activated sludge processes of municipal wastewater treatment plants. J Appl Microbiol 2014; 118:255-66. [DOI: 10.1111/jam.12683] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 10/26/2014] [Accepted: 10/26/2014] [Indexed: 11/27/2022]
Affiliation(s)
- K. Sakai
- Division of Sustainable Energy and Environmental Engineering; Osaka University; Suita Osaka Japan
| | - S. Miyake
- Division of Sustainable Energy and Environmental Engineering; Osaka University; Suita Osaka Japan
| | - K. Iwama
- Division of Sustainable Energy and Environmental Engineering; Osaka University; Suita Osaka Japan
| | - D. Inoue
- Department of Health Science; Kitasato University; Sagamihara-Minami Kanagawa Japan
| | - S. Soda
- Division of Sustainable Energy and Environmental Engineering; Osaka University; Suita Osaka Japan
| | - M. Ike
- Division of Sustainable Energy and Environmental Engineering; Osaka University; Suita Osaka Japan
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Hashimoto K, Matsuda M, Inoue D, Ike M. Bacterial community dynamics in a full-scale municipal wastewater treatment plant employing conventional activated sludge process. J Biosci Bioeng 2014; 118:64-71. [DOI: 10.1016/j.jbiosc.2013.12.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 11/20/2013] [Accepted: 12/10/2013] [Indexed: 10/25/2022]
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Ayano H, Miyake M, Terasawa K, Kuroda M, Soda S, Sakaguchi T, Ike M. Isolation of a selenite-reducing and cadmium-resistant bacterium Pseudomonas sp. strain RB for microbial synthesis of CdSe nanoparticles. J Biosci Bioeng 2014; 117:576-81. [DOI: 10.1016/j.jbiosc.2013.10.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 10/03/2013] [Accepted: 10/08/2013] [Indexed: 10/26/2022]
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Valentín-Vargas A, Toro-Labrador G, Massol-Deyá AA. Bacterial community dynamics in full-scale activated sludge bioreactors: operational and ecological factors driving community assembly and performance. PLoS One 2012; 7:e42524. [PMID: 22880016 PMCID: PMC3411768 DOI: 10.1371/journal.pone.0042524] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 07/10/2012] [Indexed: 11/27/2022] Open
Abstract
The assembling of bacterial communities in conventional activated sludge (CAS) bioreactors was thought, until recently, to be chaotic and mostly unpredictable. Studies done over the last decade have shown that specific, and often, predictable random and non-random factors could be responsible for that process. These studies have also motivated a “structure–function” paradigm that is yet to be resolved. Thus, elucidating the factors that affect community assembly in the bioreactors is necessary for predicting fluctuations in community structure and function. For this study activated sludge samples were collected during a one-year period from two geographically distant CAS bioreactors of different size. Combining community fingerprinting analysis and operational parameters data with a robust statistical analysis, we aimed to identify relevant links between system performance and bacterial community diversity and dynamics. In addition to revealing a significant β-diversity between the bioreactors’ communities, results showed that the largest bioreactor had a less dynamic but more efficient and diverse bacterial community throughout the study. The statistical analysis also suggests that deterministic factors, as opposed to stochastic factors, may have a bigger impact on the community structure in the largest bioreactor. Furthermore, the community seems to rely mainly on mechanisms of resistance and functional redundancy to maintain functional stability. We suggest that the ecological theories behind the Island Biogeography model and the species-area relationship were appropriate to predict the assembly of bacterial communities in these CAS bioreactors. These results are of great importance for engineers and ecologists as they reveal critical aspects of CAS systems that could be applied towards improving bioreactor design and operation.
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Affiliation(s)
- Alexis Valentín-Vargas
- Department of Biology, University of Puerto Rico at Mayagüez, Mayagüez, Puerto Rico, United States of America.
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Le Nguyen A, Sato A, Inoue D, Sei K, Soda S, Ike M. Bacterial community succession during the enrichment of chemolithoautotrophic arsenite oxidizing bacteria at high arsenic concentrations. J Environ Sci (China) 2012; 24:2133-2140. [PMID: 23534210 DOI: 10.1016/s1001-0742(11)61028-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To generate cost-effective technologies for the removal of arsenic from water, we developed an enrichment culture of chemolithoautotrophic arsenite oxidizing bacteria (CAOs) that could effectively oxidize widely ranging concentrations of As(III) to As(V). In addition, we attempted to elucidate the enrichment process and characterize the microbial composition of the enrichment culture. A CAOs enrichment culture capable of stably oxidizing As(lII) to As(V) was successfully constructed through repeated batch cultivation for more than 700 days, during which time the initial As(III) concentrations were increased in a stepwise manner from 1 to 10-12 mmol/L. As(III) oxidation activity of the enrichment culture gradually improved, and 10-12 mmol/L As(III) was almost completely oxidized within four days. Terminal restriction fragment length polymorphism analysis showed that the dominant bacteria in the enrichment culture varied drastically during the enrichment process depending on the As(III) concentration. Isolation and characterization of bacteria in the enrichment culture revealed that the presence of multiple CAOs with various As(III) oxidation abilities enabled the culture to adapt to a wide range of As(III) concentrations. The CAOs enrichment culture constructed here may be useful for pretreatment of water from which arsenic is being removed.
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Affiliation(s)
- Ai Le Nguyen
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Inoue D, Yamazaki Y, Tsutsui H, Sei K, Soda S, Fujita M, Ike M. Impacts of gene bioaugmentation with pJP4-harboring bacteria of 2,4-D-contaminated soil slurry on the indigenous microbial community. Biodegradation 2011; 23:263-76. [DOI: 10.1007/s10532-011-9505-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Accepted: 08/06/2011] [Indexed: 10/17/2022]
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