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Biodegraded peat and ultrafine calcium carbonate result in retained metals and higher microbial diversities in boreal acid sulfate soil

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Soil Ecology Letters 2020年第2期2卷 120-130页

作者： Eva Hogfors-Ronnholm Stephan Christel tom lillhonga Sten Engblom Peter Osterholm Mark Dopson Research and Development Novia University of Applied SciencesVaasa 65200Finland Centre for Ecology and Evolution in Microbial Model Systems(EEMiS) Linnaeus UniversityKalmar 39231Sweden Department of Geology and Mineralogy Abo Akademi UniversityTurku 20500Finland

To efficiently mitigate bacterial mediated acid and metal discharge from acid sulfate soils,ironand sulfur-oxidizing microorganisms that catalyze the iron sulfide dissolution should be *** organic carbon source could further be introduced into the soil to promote the growth of iron-and sulfur-reducing *** this study,acid sulfate soil was amended with a mobile form of ultrafine calcium carbonate alone or in combination with fractions of peat,sodium acetate,or sodium *** introduction of ultrafine calcium carbonate resulted in a raised pH that appeared to inactivate the acidophiles,but did not reactivate iron-or sulfurreducing *** addition of organic matter resulted in higher microbial diversities and retention of metals,although acid-tolerant and acidophilic microbes still dominated.A low abundance of an iron-reducing bacteria was identified in the all treatments with both peat fractions and pure organic carbon *** results indicated that biodegraded peat could be used as an energy source for at least iron-reducing bacteria in the acid sulfate soil at the same time as it retains metals in the *** findings are of value for further developing mitigation methods for the sustainable use of acid sulfate soils.

关键词： 16S rRNA gene Microbial community Organic material Mitigation

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On-Line Measurement of the Chemical Oxygen Demand in Wastewater in a Pulp and Paper Mill Using Near Infrared Spectroscopy

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Spectral Analysis Review 2014年第4期2卷 19-25页

作者： John Dahlbacka Josefina Nystrom Torgny Mossing Paul Geladi tom lillhonga Unit for Research and Development Novia University of Applied SciencesVaasaFinland Department of Forest Biomaterials and Technology Swedish University of Agricultural SciencesUmeaSweden

Although near infrared (NIR) spectroscopy has been evaluated for numerous applications, the number of actual on-line or even on-site industrial applications seems to be very limited. In the present paper, the attempts to produce online predictions of the chemical oxygen demand (COD) in wastewater from a pulp and paper mill using NIR spectroscopy are described. The task was perceived as very challenging, but with a root mean square error of prediction of 149 mg/l, roughly corresponding to 1/10 of the studied concentration interval, this attempt was deemed as successful. This result was obtained by using partial least squares model regression, interpolated reference values for calibration purposes, and by evenly distributing the calibration data in the concentration space. This work may also represent the first industrial application of online COD measurements in wastewater using NIR spectroscopy.

关键词： Chemical Oxygen Demand (COD) Industrial Wastewater Near Infrared Spectroscopy (NIR) Multivariate Calibration On-Line Measurement

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