Oxygen demand theoretical

If the composition of the waste stream is known, then the theoretical oxygen demand can be calculated from the appropriate stoichiometric equations. As a first level of approximation, we can assume that this theoretical oxygen demand would be equal to the COD. Then, experience with domestic sewage indicates that the average ratio of COD to BOD will be on the order 1.5 to 2. The following example will help to clarify these relationships. [Pg.309]

Solution First, calculate the theoretical oxygen demand from the equation that represents the overall oxidation of the acetone ... [Pg.309]

Environmental Aspects. Airborne particulate matter (187) and aerosol (188) samples from around the world have been found to contain a variety of organic monocarboxyhc and dicarboxyhc acids, including adipic acid. Traces of the acid found ia southern California air were related both to automobile exhaust emission (189) and, iadirecfly, to cyclohexene as a secondary aerosol precursor (via ozonolysis) (190). Dibasic acids (eg, succinic acid) have been found even ia such unlikely sources as the Murchison meteorite (191). PubHc health standards for adipic acid contamination of reservoir waters were evaluated with respect to toxicity, odor, taste, transparency, foam, and other criteria (192). BiodegradabiUty of adipic acid solutions was also evaluated with respect to BOD/theoretical oxygen demand ratio, rate, lag time, and other factors (193). [Pg.246]

Several methods have been developed to estimate the oxygen demand in waste water treatment systems. Commonly used laboratory methods are biochemical oxygen demand (BOD), chemical oxygen demand (COD), total oxygen demand (TOD), total organic carbon (TOC), and theoretical oxygen demand (ThOD). [Pg.340]

Approximating the molar density of the waste stream to be that of pure water (i.e. 56 krnol rn 3), then theoretical oxygen demand... [Pg.584]

Since the publication of the third edition, additional data have been critically reviewed. New or additional data included in this edition are bioconcentration factors, aquatic mammalian toxicity values, degradation rates, corresponding half-lives in various environmental compartments, ionization potentials, aqueous solubility of miscellaneous compounds, Henry s law constants, biological, chemical, and theoretical oxygen demand values for various organic compounds. Five additional tables have been added Test Method Number Index, Dielectric Values of Earth Materials and Fluids, Lowest Odor Threshold Concentrations of Organic Compoimds in Water, and Lowest Threshold Concentrations of Organic Compounds in Water. [Pg.10]

ThOD Theoretical oxygen demand. DSA Dimeric sodium acrylate,... [Pg.127]

Theoretical Oxygen Demand (ThOD) — tire cumulative amount of oxygen needed to completely oxidize a given material. The ThOD is the upper limit for BOD, values, although it is seldom achieved. A comparison of the BOD, and ThOD values for a given chemical provides an indication of the biodegradability of that chemical. [Pg.201]

Baker, J.R., Milke, M.W. and Mihelcic, J.R. (1999) Relationship between chemical and theoretical oxygen demand for specific classes of organic chemicals. Water Res., 33 (2), 327-334. [Pg.278]

Baker JR, Milke MW, Mihelcic JR (1999) Relationship Between Chemical and Theoretical Oxygen Demand for Specific Classes of Organic Chemicals, Wat. Res. [Pg.136]

ThOD theoretical oxygen demand. (Reproduced with pemnission of Springer Verlag, Ref. [55].)... [Pg.243]

Also the traditional BOD5 tests (e.g. the EU C.5 test) may demonstrate whether a substance is readily biodegradable. In this test, the relative biochemical oxygen demand in a period of 5 days is compared to the theoretical oxygen demand (ThOD) or, when this is not available, the chemical oxygen demand (COD). The test is completed within five days and consequently, the pass level defined in the proposed hazard classification criteria at 50% is lower than in the ready biodegradability tests. [Pg.495]

TABLE 4.9 Comparison of the Experimental and Theoretical Oxygen Demand with Estimates from Total Organic Carbon Reading for Some Representative Compounds in Water"... [Pg.132]

What would be the theoretical oxygen demand of a wastewater stream from an integrated steel mill which contains ... [Pg.450]

Theoretical oxygen demand, ThOD The theoretical oxygen demand is the amount of oxygen required to completely oxidise a given chemical compound, calculated from its chemical formula. [Pg.451]

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