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Molecular weight distribution of the recalcitrant organic matter contained in kraft mill effluents and the identification of microbial consortia responsible for an anaerobic biodegradable fraction. | LitMetric

Molecular weight distribution of the recalcitrant organic matter contained in kraft mill effluents and the identification of microbial consortia responsible for an anaerobic biodegradable fraction.

J Environ Sci Health A Tox Hazard Subst Environ Eng

Engineering and Biotechnology Environmental Group, Environmental Science Faculty & Center EULA-Chile, University of Concepción, Concepción, Chile.

Published: April 2020

AI Article Synopsis

  • * The study found that the overall removal efficiencies for chemical oxygen demand (COD) and biological oxygen demand (BOD) were 28% and 53%, respectively, with most non-biodegradable matter having molecular weights over 10,000 Da.
  • * Specific methanogenic archaea and dominant sulfate-reducing bacteria were identified in different reactor zones, indicating the microbial diversity involved in the treatment process.

Article Abstract

The objective of this research was to evaluate the distribution of the molecular weights of the recalcitrant organic matter contained in kraft mill effluents and identify microbial consortia responsible for an anaerobic biodegradable fraction. As a result, the average removal efficiencies of chemical organic demand (COD) and biological oxygen demand (BOD) during the entire period of operation were 28% and 53%, respectively. The non-biodegradable organic matter was detected at molecular weights less than 1000 Da. However, most of the organic matter was in the molecular weight fraction higher than 10000 Da with 32 ± 11.6% COD as well as color (42.3 ± 8.7%), total phenolic compounds (35.9 ± 7.9%) and adsorbable organic compounds (AOX) (13.0 ± 2.7%). Methanogenic acetoclastic archaea of the genera and were found in the surface and middle zones of the reactor. Moreover, and were identified in the low zone of the reactor. In all zones of the reactor, and were found to be the most dominant genera of sulfate-reducing bacteria (SRB).

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Source
http://dx.doi.org/10.1080/10934529.2019.1688019DOI Listing

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