Oxygen demand biological

Data on biological oxygen demand versus time are modeled by the following equation [Pg.322]

Although this is a dynamic experiment where data are collected over time, it is considered as a simple algebraic equation model with two unknown parameters. [Pg.322]

Using an initial guess of kj=350 and k2=l the Gauss-Newton method converged in five iterations without the need for Marquardt s modification. The estimated parameters are k,= 334.27 2.10% and k2=0.38075 5.78%. The model-calculated values are compared with the experimental data in Table 17.1. As seen the agreement is very good in this case. [Pg.323]

The quadratic convergence of the Gauss-Newton method is shown in Table 17.2 where the reduction of the LS objective function is shown for an initial guess of k =l00 andk2=0.1. [Pg.323]

Bmnauer-Emmett-TeUer (adsorption equation) twice daily t-butyloxycarbonyl biochemical (biological) oxygen demand boiling point becquerel... [Pg.565]

Toxic or malodorous pollutants can be removed from industrial gas streams by reaction with hydrogen peroxide (174,175). Many Hquid-phase methods have been patented for the removal of NO gases (138,142,174,176—178), sulfur dioxide, reduced sulfur compounds, amines (154,171,172), and phenols (169). Other effluent treatments include the reduction of biological oxygen demand (BOD) and COD, color, odor (142,179,180), and chlorine concentration. [Pg.481]

Sewer Disposal. Photoprocessing and printing wastes tend to be aqueous solutions that ate combined with other plant effluents and sent to the local sewer plant for treatment. The parameters of concern include silver, pH, and biological oxygen demand (BOD). BOD is a measure of how well a waste material degrades in the environment. Lower values ate preferred. Silver-bearing waste streams ate typically treated on-site, and the treated effluent is released to the drain. The printer usually receives a small cash credit for silver recovered. [Pg.57]

Refs. 22, 23. BOD = Biological oxygen demand. COD = Chemical oxygen demand. TSS liihle 1. (Continued) Total suspended solids. O and G = oil and grease. ... [Pg.289]

The biological oxygen demand (BOD) in aqueous streams for both butanals is 1.62 wt/wt for five days (42). The NFPA Hazard classification (42) ... [Pg.382]

EinaHy, the ecotoxicological studies, designed to assess the impact of the substance on the environment, embrace acute toxicity tests to fish and Daphnia, and a battery of tests for the biodegradabiUty of the substance and its biological oxygen demand characteristics. [Pg.301]

The production of reduced products like methane and ammonia by the gut microbial flora has important environmental consequences, as such compounds contribute to the chemical and biological oxygen demand. The detection of dissolved oxygen in the gut of piglets led to tests to show whether methane and other reduced products could be oxidized in the pig gut. The production of C-labelledCOj from C-labelledmethane has been demonstrated however, it is calculated that at most only a very small proportion of methane produced is likely to be oxidized using O 2 as electron acceptor. Methane may also be oxidized anaerobically, but only an extremely small amount of methane is likely to... [Pg.100]

Industrial wastewater Process effluent treatment to meet environmental discharge standards Reduction of total organic halogens (TOX), biological oxygen demand (BOD), and chemical oxygen demand (COD)... [Pg.416]

BOD Biological Oxygen Demand COD Chemical Oxygen Demand... [Pg.564]

Biological Oxygen Demand (BOD)—Limit BOD to 25 ppm, particularly if suspended solids exceed 25 ppm. [Pg.392]

BOD Biological oxygen demand expressed as ppm or mg/1, it is used as a measure of pollution. [Pg.530]

Sewage and organic industrial wastes This type of pollution adversely affects the oxygen content of water (BOD, biological oxygen demand). [Pg.151]

More stringent limits are imposed upon discharges to natural waters as exemplified in Table 16.16. In both cases the BOD, the biological oxygen demand, represents the demand for oxygen in order to decompose the organics in the effluent. [Pg.507]

Activated sludge processes are frequently used to reduce the biological oxygen demand of an aqueous effluent before discharge. [Pg.904]

Best practicable control technology currently available (BPT) and best conventional control technology (BCT) guidelines for the control of conventional pollutants (biological oxygen demand, total suspended solids, and pH)... [Pg.884]

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