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233 results on '"Parameswaran, Prathap"'

1. Adsorptive recovery of volatile fatty acids from wastewater fermentation broth

Author

Singh, Ramkrishna, Palar, Skye, Kowalczewski, Amy, Swope, Caitlin, Parameswaran, Prathap, and Sun, Ning

Subjects
Chemical Engineering, Engineering, Adsorption, Ion-exchange resin, Volatile fatty acids, Wastewater, Resin reuse, Fermentation broth, Physical Chemistry (incl. Structural), Environmental Engineering, Physical chemistry, Chemical engineering, Environmental engineering
Abstract

This work developed an adsorptive separation and recovery process for anaerobically generated volatile fatty acids (VFAs) from swine wastewater fermentation. Batch adsorption studies were conducted using several weak anion exchange resins and synthetic adsorbent resins to identify a suitable candidate. Relite RAM2 with a tertiary amine functional group showed the highest adsorption (over 98%) of hexanoic acid. Under the different pH values (1.8–7.5) and extraction temperatures (30–50 °C), the highest adsorption was observed at a pH of 3.2, which is below the pKa of hexanoic acid, at all the evaluated temperatures. A full factorial design was used to optimize the resin and VFA concentrations, wherein over 99% adsorption could be achieved when the ratio of VFA to resin was below 0.23 (g/g) for model solution (VFAs in water). The adsorption equilibrium could be achieved within 30 min of contact time and 0.5% w/v NaOH was identified as a suitable desorption agent. Under the optimal conditions, 65–72% of VFAs present in fermentation broth was adsorbed, which was increased to 72–76% by using fresh resins. The VFAs adsorption and recovery efficiency were maintained for 9 successive cycles without requiring extensive resin washing and regeneration for both model solution and fermentation broth. Overall, the work presents a comprehensive study for resin adsorption to recover VFAs and provides a potential industrial-relevant process to recover VFAs from fermentation broth.

Published
2023

32. Development of a graduate-level capstone course for interdisciplinary researchers: design approaches and lessons learned.

Author

Shamir, Mirit, Hutchinson, Stacy L., Hock, Gaea A., Hansen, Ryan Robert, Aguilar, Jonathan, Hendricks, Nathan P., Parameswaran, Prathap, Sanderson, Matthew R., Cors, Rebecca, and Derby, Melanie

Subjects
INTERDISCIPLINARY research, CAPSTONE courses, GRADUATE students, SUSTAINABILITY, TEACHING methods
Abstract

Compared to undergraduate capstone courses, there are limited discussions about interdisciplinary capstone requirements, structures, challenges, and experiences for graduate students. This paper will detail the interdisciplinary NSF Research Traineeship (NRT) Capstone course structure that can be beneficial to the implementation of an interdisciplinary capstone course at the graduate level. The NRT capstone is a two-credit course, and part of the NRT program at our university. The NRT prepares master's and doctoral students from engineering and social sciences to solve the grand challenges of creating resilient food, energy, and water (FEW) systems in rural communities. Resilience/sustainability problems are complex and often require professionals with different expertise and backgrounds to work as a team to generate an emergent solution; thus, an interdisciplinary curriculum provides students with the skills needed to work in an interdisciplinary environment. The NRT Capstone Course is a project-based, cross-listed course that has been developed and cotaught by faculty from the Colleges of Engineering, Agriculture, and Arts and Sciences at our university. The NRT Capstone curriculum builds on knowledge students gained from a prerequisite interdisciplinary course about system thinking, called Integrated FEW Systems. In the capstone, students work on an interdisciplinary team based on their research interests. Teams are formed with students from at least two disciplines. In spring 2021, we had three teams, and each team was comprised of five or six M.S. and/or Ph.D. students. The course format, team teaching strategies, and grading structures encouraged an interdisciplinary approach to investigating their research question(s). Students attended faculty-guided lectures designed to provide training in communication, team collaboration, research, and final research product preparation. Course grades were project-based and included individual assignments and team assignments. Student teams were charged with writing an interdisciplinary conference or journal article. Teams developed an outline, and received written and verbal feedback from faculty after submission, identified an appropriate target journal, and wrote a draft research paper. At least two faculty members served as mentors to each team. To complement the teamwork, students individually wrote a literature review relevant to the interdisciplinary research topic. Teams incorporated the individual literature reviews into the team research paper. Student teams also met for 50-minute workdays every other week where they collaborated with their team members on the final research product. Teams presented their final research products during the course's final exam block; presentations were in person, masked and distanced, with some faculty attending virtually. The products of the first NRT Capstone class, taught in spring 2021, included one team's interdisciplinary journal paper, recently published in a Frontiers journal. Following the course, another team is working on finalizing their paper to be submitted to a different Frontiers journal. The third team is restructuring its research findings to present their outcomes and is a work in progress. Feedback through an end-of-course survey highlighted that what students valued most about their Capstone Course experience was real, hands-on interdisciplinary teamwork. Their feedback also provided ideas for fine-tuning future course activities. [ABSTRACT FROM AUTHOR]

Published
2022

38. Author Correction: Global diversity and biogeography of bacterial communities in wastewater treatment plants (Nature Microbiology, (2019), 4, 7, (1183-1195), 10.1038/s41564-019-0426-5)

Author

Wu, Linwei, Ning, Daliang, Zhang, Bing, Li, Yong, Zhang, Ping, Shan, Xiaoyu, Zhang, Qiuting, Brown, Mathew Robert, Li, Zhenxin, Van Nostrand, Joy D., Ling, Fangqiong, Xiao, Naijia, Zhang, Ya, Vierheilig, Julia, Wells, George F., Yang, Yunfeng, Deng, Ye, Tu, Qichao, Wang, Aijie, Acevedo, Dany, Agullo-Barcelo, Miriam, Alvarez, Pedro J.J., Alvarez-Cohen, Lisa, Andersen, Gary L., de Araujo, Juliana Calabria, Boehnke, Kevin F., Bond, Philip, Bott, Charles B., Bovio, Patricia, Brewster, Rebecca K., Bux, Faizal, Cabezas, Angela, Cabrol, Léa, Chen, Si, Criddle, Craig S., Etchebehere, Claudia, Ford, Amanda, Frigon, Dominic, Sanabria, Janeth, Griffin, James S., Gu, April Z., Habagil, Moshe, Hale, Lauren, Hardeman, Steven D., Harmon, Marc, Horn, Harald, Hu, Zhiqiang, Jauffur, Shameem, Johnson, David R., Keller, Jurg, Keucken, Alexander, Kumari, Sheena, Leal, Cintia Dutra, Lebrun, Laura A., Lee, Jangho, Lee, Minjoo, Lee, Zarraz M.P., Li, Mengyan, Li, Xu, Liu, Yu, Luthy, Richard G., Mendonça-Hagler, Leda C., de Menezes, Francisca Gleire Rodriguez, Meyers, Arthur J., Mohebbi, Amin, Nielsen, Per H., Oehmen, Adrian, Palmer, Andrew, Parameswaran, Prathap, Park, Joonhong, Patsch, Deborah, Reginatto, Valeria, de los Reyes, Francis L., Rittmann, Bruce E., Noyola, Adalberto, Rossetti, Simona, Sidhu, Jatinder, Sloan, William T., Smith, Kylie, de Sousa, Oscarina Viana, Stahl, David A., Stephens, Kyle, Tian, Renmao, Tiedje, James M., Tooker, Nicholas B., De los Cobos Vasconcelos, Daniel, Wagner, Michael, Wakelin, Steve, Wang, Bei, and Weaver, Joseph E.

Subjects
microbiome, activated sludge, wastewater treatment plants, bacterial communities
Abstract

In the version of this Article originally published, the name of the author 'Mathew Robert Brown' was incorrectly written as 'Mathew Brown' in the main author list and as 'Matthew Brown' in the Global Water Microbiome Consortium list. In addition, in the Global Water Microbiome Consortium list, the names of the authors 'Kevin F. Boehnke', 'Janeth Sanabria' and 'Adalberto Noyola' were incorrectly written as 'Kevin Boehnke', 'Janeth Sanabria Gómez' and 'Adalberto Noyola Robles', respectively. The names have now been corrected and the author initials in the author contributions section updated accordingly.

Published
2019

39. Role of bicarbonate as a pH buffer and electron sink in microbial dechlorination of chloroethenes

Author

Delgado Anca G, Parameswaran Prathap, Fajardo-Williams Devyn, Halden Rolf U, and Krajmalnik-Brown Rosa

Subjects
Acetogen, Alkalinity, Bicarbonate competition, Dehalococcoides, pH range, Trichloroethylene, Microbiology, QR1-502
Abstract

Abstract Background Buffering to achieve pH control is crucial for successful trichloroethene (TCE) anaerobic bioremediation. Bicarbonate (HCO3−) is the natural buffer in groundwater and the buffer of choice in the laboratory and at contaminated sites undergoing biological treatment with organohalide respiring microorganisms. However, HCO3− also serves as the electron acceptor for hydrogenotrophic methanogens and hydrogenotrophic homoacetogens, two microbial groups competing with organohalide respirers for hydrogen (H2). We studied the effect of HCO3− as a buffering agent and the effect of HCO3−-consuming reactions in a range of concentrations (2.5-30 mM) with an initial pH of 7.5 in H2-fed TCE reductively dechlorinating communities containing Dehalococcoides, hydrogenotrophic methanogens, and hydrogenotrophic homoacetogens. Results Rate differences in TCE dechlorination were observed as a result of added varying HCO3− concentrations due to H2-fed electrons channeled towards methanogenesis and homoacetogenesis and pH increases (up to 8.7) from biological HCO3− consumption. Significantly faster dechlorination rates were noted at all HCO3− concentrations tested when the pH buffering was improved by providing 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) as an additional buffer. Electron balances and quantitative PCR revealed that methanogenesis was the main electron sink when the initial HCO3− concentrations were 2.5 and 5 mM, while homoacetogenesis was the dominant process and sink when 10 and 30 mM HCO3− were provided initially. Conclusions Our study reveals that HCO3− is an important variable for bioremediation of chloroethenes as it has a prominent role as an electron acceptor for methanogenesis and homoacetogenesis. It also illustrates the changes in rates and extent of reductive dechlorination resulting from the combined effect of electron donor competition stimulated by HCO3− and the changes in pH exerted by methanogens and homoacetogens.

Published
2012
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40. Global diversity and biogeography of bacterial communities in wastewater treatment plants

Author

Wu, Linwei, Ning, Daliang, Zhang, Bing, Li, Yong, Zhang, Ping, Shan, Xiaoyu, Zhang, Qiuting, Brown, Mathew, Li, Zhenxin, Van Nostrand, Joy D., Ling, Fangqiong, Xiao, Naijia, Zhang, Ya, Vierheilig, Julia, Wells, George F., Yang, Yunfeng, Deng, Ye, Tu, Qichao, Wang, Aijie, Zhang, Tong, He, Zhili, Keller, Jurg, Nielsen, Per H., Alvarez, Pedro J.J., Criddle, Craig S., Wagner, Michael, Tiedje, James M., He, Qiang, Curtis, Thomas P., Stahl, David A., Alvarez-Cohen, Lisa, Rittmann, Bruce E., Wen, Xianghua, Zhou, Jizhong, Acevedo, Dany, Agullo-Barcelo, Miriam, Andersen, Gary L., de Araujo, Juliana Calabria, Boehnke, Kevin, Bond, Philip, Bott, Charles B., Bovio, Patricia, Brewster, Rebecca K., Bux, Faizal, Cabezas, Angela, Cabrol, Léa, Chen, Si, Etchebehere, Claudia, Ford, Amanda, Frigon, Dominic, Gómez, Janeth Sanabria, Griffin, James S., Gu, April Z., Habagil, Moshe, Hale, Lauren, Hardeman, Steven D., Harmon, Marc, Horn, Harald, Hu, Zhiqiang, Jauffur, Shameem, Johnson, David R., Keucken, Alexander, Kumari, Sheena, Leal, Cintia Dutra, Lebrun, Laura A., Lee, Jangho, Lee, Minjoo, Lee, Zarraz M.P., Li, Mengyan, Li, Xu, Liu, Yu, Luthy, Richard G., Mendonça-Hagler, Leda C., de Menezes, Francisca Gleire Rodriguez, Meyers, Arthur J., Mohebbi, Amin, Oehmen, Adrian, Palmer, Andrew, Parameswaran, Prathap, Park, Joonhong, Patsch, Deborah, Reginatto, Valeria, de los Reyes, Francis L., Noyola, Adalberto, Rossetti, Simona, Sidhu, Jatinder, Sloan, William T., Smith, Kylie, de Sousa, Oscarina Viana, Stephens, Kyle, Tian, Renmao, Tooker, Nicholas B., De los Cobos Vasconcelos, Daniel, Wakelin, Steve, Wang, Bei, Weaver, Joseph E., West, Stephanie, Wilmes, Paul, Woo, Sung Geun, Wu, Jer Horng, University of Oklahoma (OU), Tsinghua University [Beijing] (THU), College of Resource and Environment Southwest University, Newcastle University [Newcastle], Northeastern Normal University, Washington University in Saint Louis (WUSTL), University of Vienna [Vienna], Northwestern University [Evanston], Shandong University, Chinese Academy of Sciences [Beijing] (CAS), The University of Hong Kong (HKU), Sun Yat-Sen University [Guangzhou] (SYSU), University of Queensland [Brisbane], Aalborg University [Denmark] (AAU), Rice University [Houston], Stanford University, Michigan State University System, The University of Tennessee [Knoxville], University of Washington [Seattle], University of California [Berkeley] (UC Berkeley), University of California (UC), Arizona State University [Tempe] (ASU), University of California [Berkeley], and University of California

Subjects
[SDV.BIO]Life Sciences [q-bio]/Biotechnology, Biodiversity, microbiome, Applied Microbiology and Biotechnology, Global Water Microbiome Consortium, Wastewater treatment plants, RNA, Ribosomal, 16S, activated sludge, 0303 health sciences, Geography, Sewage, Ecology, [SDE.IE]Environmental Sciences/Environmental Engineering, Microbiota, Bacterial, 6. Clean water, Wastewater, Medical Microbiology, Sewage treatment, Infection, Sequence Analysis, Microbiology (medical), DNA, Bacterial, 16S, [SDE.MCG]Environmental Sciences/Global Changes, Immunology, BACTÉRIAS, Theoretical ecology, Microbiology, Water Purification, 03 medical and health sciences, Microbial ecology, Genetics, 14. Life underwater, 030304 developmental biology, Ribosomal, Bacteria, 030306 microbiology, Species diversity, Cell Biology, DNA, Sequence Analysis, DNA, bacterial communities, [SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology, Activated sludge, 13. Climate action, Biological dispersal, RNA, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract

International audience; Microorganisms in wastewater treatment plants (WWTPs) are essential for water purification to protect public and environmental health. However, the diversity of microorganisms and the factors that control it are poorly understood. Using a systematic global-sampling effort, we analysed the 16S ribosomal RNA gene sequences from ~1,200 activated sludge samples taken from 269 WWTPs in 23 countries on 6 continents. Our analyses revealed that the global activated sludge bacterial communities contain ~1 billion bacterial phylotypes with a Poisson lognormal diversity distribution. Despite this high diversity, activated sludge has a small, global core bacterial community (n = 28 operational taxonomic units) that is strongly linked to activated sludge performance. Meta-analyses with global datasets associate the activated sludge microbiomes most closely to freshwater populations. In contrast to macroorganism diversity, activated sludge bacterial communities show no latitudinal gradient. Furthermore, their spatial turnover is scale-dependent and appears to be largely driven by stochastic processes (dispersal and drift), although deterministic factors (temperature and organic input) are also important. Our findings enhance our mechanistic understanding of the global diversity and biogeography of activated sludge bacterial communities within a theoretical ecology framework and have important implications for microbial ecology and wastewater treatment processes.

Published
2018

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