Oxygen transfer limitation of a respirometer

Chandran, Kartik; Accashian, John V.; Smets, Barth F.

doi:10.2175/106143096x128081

Cited by 2 publications

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“…Attempts have been made to eliminate some of the technical disadvantages of the standard BOD method and to develop alternative techniques (respirometers) to provide a more realistic approach to the measurement of oxygen demand in treatment plants (Tebbutt & Berkun 1976; Arthur 1984). The experimental procedures that have gained popularity and that are intimately related to the BOD principle are the manometric and electrolytic respirometers to monitor the progression of biodegradation reactions in terms of oxygen uptake (Young & Baumann 1976; Larson & Perry 1980; Suschka & Ferreira 1986; Chandran et al . 1996; Ellis et al .…”

Section: Introductionmentioning

confidence: 99%

Effects of carbon dioxide deficiency and metal toxicity on biological oxygen demand

Berkün

2011

Water & Environment J

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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.

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Section: Introductionmentioning

confidence: 99%

Effects of carbon dioxide deficiency and metal toxicity on biological oxygen demand

Berkün

2011

Water & Environment J

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Az91d合金射出成形品の金属組織，機械的性質および熱的性質に及ぼすグラファイト添加の影響

Hideshima

Maeda

Fukuta

et al. 2022

J. Japan Inst. Metals and Materials

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Magnesium chips were coated with a high concentration of graphite using a binder, and then used as the raw material for thixomolding. The microstructure of the magnesium injection-molded product with the addition of graphite exhibited a dispersion of needle-like graphite. No significant voids were observed at interfaces between the graphite and matrix. The addition of more than 0.5 mass％ graphite decreased the proof stress and tensile strength of the injection-molded products. The Young's modulus of graphite-added products showed a tendency to decrease with increasing addition of graphite, which was consistent with the lower limit of the rule of composites. Compared to AZ91D, the thermal conductivity of the 6.9 mass％ graphite-added product was increased, and the coefficient of linear thermal expansion was decreased. Both were within the ranges where the rules of mixtures were satisfied.

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Oxygen transfer limitation of a respirometer

Cited by 2 publications

References 0 publications

Effects of carbon dioxide deficiency and metal toxicity on biological oxygen demand

Effects of carbon dioxide deficiency and metal toxicity on biological oxygen demand

Az91d合金射出成形品の金属組織，機械的性質および熱的性質に及ぼすグラファイト添加の影響

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