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Effects of carbon dioxide deficiency and metal toxicity on biological oxygen demand
Author(s) -
Berkun Mehmet
Publication year - 2011
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2009.00193.x
Subject(s) - respirometer , respirometry , biochemical oxygen demand , chemistry , carbon dioxide , bacterial growth , oxygen , environmental chemistry , autotroph , toxicity , microorganism , dilution , chemical oxygen demand , bacteria , environmental engineering , biology , biochemistry , environmental science , organic chemistry , wastewater , genetics , physics , thermodynamics
In this study, the effects of carbon dioxide (CO 2 ) deficiency on the biological growth under respirometric conditions, first‐ and second‐order biological oxygen demand (BOD) progressions using two different BOD measurement techniques and metal toxicity effects on the respirometric BOD are investigated. The effects of CO 2 deficiency in the growth of bacteria and related effects on the first‐ and second‐stage BOD progressions are investigated using various media with respirometers in comparison with the BOD dilution method. CO 2 deficiency causes significant retardations on the growth of bacteria and the second‐stage respirometric BOD values are suppressed. CO 2 seems to be an essential nutrient for the growth of microorganisms and for the oxygen uptake progressing rates. HgCl 2 , HgSO 4 , CuSO 4 , K 2 Cr 2 O 7 , ZnSO4 and Al 2 (SO 4 ) 3 inorganic metal compounds cause significant retardations in the respirometric BOD values obtained from a synthetic autotrophic medium. Effects are found to be dependent on the applied concentrations of these chemicals in the medium.