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      Performance of an Anaerobic Baffled Reactor (ABR) in treatment of cassava wastewater

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          Abstract

          The performance of an anaerobic baffled reactor (ABR) was evaluated in the treatment of cassava wastewater, a pollutant residue. An ABR divided in four equal volume compartments (total volume 4L) and operated at 35ºC was used in cassava wastewater treatment. Feed tank chemical oxygen demand (COD) was varied from 2000 to 7000 mg L -1 and it was evaluated the most appropriated hydraulic retention time (HRT) for the best performance on COD removal. The ABR was evaluated by analysis of COD (colorimetric method), pH, turbidity, total and volatile solids, alkalinity and acidity. Principal component analysis (PCA) was carried to better understand data obtained. The system showed buffering ability as acidity decreased along compartments while alkalinity and pH values were increased. There was particulate material retention and COD removal varied from 83 to 92% for HRT of 3.5 days.

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          Application of chemometrics in river water classification.

          Boguslaw Buszewski, Radosław Zbytniewski, Tomasz Kowalkowski … (2006)
          The main aim of this work is focused on water quality classification of the Brda river (Poland) and evaluation of pollution data obtained by the monitoring measurement during the period 1994-2002. The study presents the application of selected chemometric techniques to the pollution monitoring dataset, namely, cluster analysis, principal component analysis, discriminant analysis and factor analysis. The obtained results allowed to determine natural clusters and groups of monitoring locations with similar pollution character and identify important discriminant variables. Chemometric analysis confirmed the classification of water purity of the Brda river made by the Inspection of Environmental Protection but the results showed more differentiation between monitored locations. This enables better evaluation of the water quality in a monitored region. On the basis of the chemometric approach, it was also found that some locations were under the high influence of municipal contamination, and some others under the influence of agriculture (discharges from fields) within the observed time period.
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            The effects of air pollution and meteorological parameters on respiratory morbidity during the summer in São Paulo City.

            Milena Carvalho, T M F O Gonçalves, M R D O Latorre … (2005)
            Effects of meteorological variables and air pollutants on child respiratory morbidity are investigated during two consecutive summers (December-March 1992/1993 and 1993/1994) at the Metropolitan Area of São Paulo (MASP), Brazil. The MASP, with almost 17 million inhabitants, is considered the most populous region in South America. Due to warmer temperatures, increased rainfall and consequent low levels of air pollutants during the summer compared to winter, less attention has been paid to epidemiological studies during this season, especially in tropical urban areas such as São Paulo. In the present work, principal component analysis (PCA) is applied to medical end environmental data to identify patterns relating child morbidity, meteorological variables and air pollutants during the summer. The following pollutant concentrations are examined: SO2, inhalable particulate matter (PM10), and O3. The meteorological variables investigated are air temperature, water vapor (water vapor density) and solar radiation. Although low correlation between respiratory morbidity and environmental variables are, in general, observed for the entire dataset, the PCA method indicates that child morbidity is positively associated with O3 for the 1992/1993 summer. This pattern is identified in the third principal component (PC3), which explains about 19% of the total variance of all data in this summer. However, the 1993/1994 summer shows a more complex association between both groups, suggesting stronger ties with meteorological variables. Marked changes in synoptic conditions from the end of January to end of March of the 1993/1994 summer seem to have played an important role in modulating respiratory morbidity. A detailed examination of meteorological conditions in that period indicates that prefrontal (postfrontal), hot (cold) and dry (wet) days favored the observed decrease (increase) of respiratory morbidity.
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              Performance characteristics of the anaerobic baffled reactor

              A. Bachmann (1985)
              Article 0 comments Cited 10 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Braz J Microbiol
                Journal ID (iso-abbrev): Braz. J. Microbiol
                Journal ID (publisher-id): bjm
                Journal ID (pmc): bjm
                Title: Brazilian Journal of Microbiology
                Publisher: Sociedade Brasileira de Microbiologia
                ISSN (Print): 1517-8382
                ISSN (Electronic): 1678-4405
                Publication date (Print): Jan-Mar 2009
                Publication date (Electronic): 1 March 2009
                Volume: 40
                Issue: 1
                Pages: 48-53
                Affiliations
                [1 ]Departamento de Engenharia e Tecnologia de Alimentos, Instituto de Biociências Letras e Ciências Exatas de São José do Rio Preto, Universidade Estadual Paulista São Paulo, São José do Rio Preto, SP, Brasil;
                [2 ]Departamento de Física, Instituto de Biociências Letras e Ciências Exatas de São José do Rio Preto, Universidade Estadual Paulista, São José do Rio Preto, SP, Brasil.
                Author notes
                *Corresponding Author. Mailing address: Departamento de Engenharia e Tecnologia de Alimentos, Instituto de Biociências Letras e Ciências Exatas de São José do Rio Preto, Universidade Estadual Paulista Cep 15054-000, São Paulo, Brasil. E-mail: fernanda.m.ferraz@ 123456gmail.com
                Article
                Publisher ID: S1517-83822009000100007
                DOI: 10.1590/S1517-83822009000100007
                PMC ID: 3768494
                PubMed ID: 24031316
                SO-VID: fdb3faa6-0401-4a76-8e4c-e46e07d7164a
                Copyright © © Sociedade Brasileira de Microbiologia
                License:

                All the content of the journal, except where otherwise noted, is licensed under a Creative Commons License

                History
                Date received : 18 January 2008
                Date revision received : 15 March 2008
                Date accepted : 25 February 2009
                Categories
                Subject: Industrial Microbiology
                Subject: Research Paper

                Keywords: anaerobic baffled reactor (abr),anaerobic digestion,cassava wastewater,cod removal,principal component analysis (pca)
                Data availability:
                Keywords: anaerobic baffled reactor (abr), anaerobic digestion, cassava wastewater, cod removal, principal component analysis (pca)

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