Evaluation of the effect of salinity on deoxygenation kinetics in the BOD test.

Authors

  • Manuela de Abreu Farias Universidade Federal de Santa Catarina (UFSC); Florianópolis (SC), Brasil.
  • Claudinei José Rodrigues Instituto Chico Mendes de Conservação da Biodiversidade - ICMBio http://orcid.org/0000-0001-6325-0793
  • Alondra Beatriz Alvarez Perez Universidade Federal de Santa Catarina (UFSC); Florianópolis (SC), Brasil.

DOI:

https://doi.org/10.18316/rca.v13i1.3756

Keywords:

BOD, Coefficient of Deoxygenation, Kinetics, Salinity.

Abstract

The biochemistry demand of oxygen (BOD) is a typical parameter used to estimate the superficial water pollution. Its determination is based on the oxygen consume during an aerobic biodegradation of compounds organics. The objective of this work was evaluate the influence of salinity on the reduction of deoxygenation coefficient (k) on BOD essay and the consequences for a BOD5 analysis. The results showed that the present of salinity affected the results of BOD in a more significant form during the period of latency. The least squares method was the most efficient method to obtain the k and L0 parameters. The addition of 15 g·L-1 of NaCl to simulate the effect of salinity on the sample, reduced the coefficient k by 41,7 % and the BOD5 by 26 %. Therefore, salinity was an interfering on the assay, underestimating the BOD5 result, should be considered in analysis of samples originated from ambients exposed to variation in salinity.

Author Biographies

Manuela de Abreu Farias, Universidade Federal de Santa Catarina (UFSC); Florianópolis (SC), Brasil.

Graduanda em Química

Claudinei José Rodrigues, Instituto Chico Mendes de Conservação da Biodiversidade - ICMBio

Químico responsável pelo Laboratório de Análise de Águas da Estação Ecológica de Carijós e Analista Ambiental do Instituto Chico Mendes de Conservação da Biodiversidade – ICMBio; Florianópolis (SC), Brasil. 

Alondra Beatriz Alvarez Perez, Universidade Federal de Santa Catarina (UFSC); Florianópolis (SC), Brasil.

Graduanda em Engenharia Sanitária e Ambiental

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Published

2019-04-30

Issue

Vol. 13 No. 1 (2019)

Section

Artigos

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