Dichromate Reflux Method for Determination of Oxygen Consumed

Moore, Wendy; Kroner, R. C.; Ruchhoft, C. C.

doi:10.1021/ac60032a020

Cited by 126 publications

(57 citation statements)

References 7 publications

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“…Chemical oxygen demand was determined in a Dr. Lange spectrophotometer, the method based on the dichromate standard procedure [8]. Total carbon (TC) and organic (TOC) carbon were analyzed using a DC-190 Dohrman carbon analyzer.…”

Section: Methodsmentioning

confidence: 99%

Joint Treatment of Wastewater from Table Olive Processing and Urban Wastewater. Integrated Ozonation - Aerobic Oxidation

Rivas

Beltrán

Gimeno

2000

Chem. Eng. Technol.

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Integrated ozonation-aerobic biodegradation of table olive wastewater (diluted 1:25 with synthetic urban wastewater) is presented as a suitable technology to purify this kind of effluent. Use of ozone is recommended as a pre-treatment step since it shows a high reactivity toward phenolic compounds (found in this type of wastewater) reducing, at the same time, the alkalinity of the media for further biological processing. An ozone dose of 45 mg L ±1 (flow rate 20 L h ±1 ) for a period of 35 min has been found to achieve the following goals: decrease pH, decrease phenolic content, and increase of biodegradability. The aerobic oxidation process followed first order kinetics as measured by COD depletion profiles versus time. The Arrhenius expression k = 183exp(±2214/T) was obtained for experiments of ozonated wastewater biodegradation completed at different temperatures and neutral pH.

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Section: Methodsmentioning

confidence: 99%

Joint Treatment of Wastewater from Table Olive Processing and Urban Wastewater. Integrated Ozonation - Aerobic Oxidation

Rivas

Beltrán

Gimeno

2000

Chem. Eng. Technol.

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“…9 BOD was determined following a barometric procedure. In this case, a reaction vessel with a volume of 400 cm 3 was magnetically stirred and thermostatted at 20°C.…”

Section: Methodsmentioning

confidence: 99%

Integration of continuous biological and chemical (ozone) treatment of domestic wastewater: 1. Biodegradation and post-ozonation

Beltrán¹,

García‐Araya²,

Álvarez³

1999

J. Chem. Technol. Biotechnol.

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The continuous treatment of domestic wastewater by an activated sludge process and by an integrated biological±chemical (ozone) oxidation process were studied in this work. Chemical oxygen demand (COD), biochemical oxygen demand (BOD), absorbance at 254 nm (UV 254 ) and nitrogenous compound content were the parameters followed in order to evaluate the performance of the two processes. Experimental data showed that both UV 254 and COD reductions are improved in the combined biological±chemical oxidation procedure. Thus, reductions of 59.1% and 37.2% corresponding to COD and UV 254 , respectively were observed after the biological process (hydraulic retention time = 5 h; mixed liquor volatile suspended solids concentration = 3142 g m À3) compared with 71.0% and 78.4% obtained when a post-ozonation step (D O3 = 41.7 g m À3 ) was included. During conventional activated sludge treatment, appropriate nitri®cation levels are only achieved with high hydraulic retention time and/or biomass concentration. Ozonation after the secondary treatment, however, allows improved nitrogen content reduction with total nitrite elimination. Post-ozonation also leads to a higher biodegradability of the treated wastewater. Thus, the ultimate BOD/COD ratio goes from 0.16 after biological oxidation to 0.34 after post-ozonation with 41.7 g O 3 m À3.

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“…During a run, samples were withdrawn from the reactor at interval times to determine the COD (Moore et al, 1949) and in some cases the dissolved ozone (Bader and Hoign6, 1981). As shown in Table I, the wastewaters under study Downloaded by [New York University] at 01:55 23 July 2015 exhibited some absorbance in the UV region (254 nm) and they were slightly colored.…”

Section: Methodsmentioning

confidence: 99%

Kinetic Study of the Ozonation of Some Industrial Wastewaters

Beltrán¹,

Encinar²,

García‐Araya³

et al. 1992

Ozone: Science & Engineering

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Kinetic studies of the ozonation of two wastewaters released by distillery and tomato processing plants have been carried out. Once it has been assumed that an irreversible gas-liquid reaction is developed between ozone and the matter present in the water, the film theory concept was applied to this system for kinetic determinations. The evolution of the organic and inorganic matter with ozonation time has been followed by the chemical oxygen demand. The procedure allows the determination of the rate coefficients of ozone with the wastewaters treated. According to the results obtained, ozone is consumed through fast reactions which take place near the water-gas interface during an initial period. This period is used to determine the rate coefficients. Then, at more advanced ozonation times, the reactions become slower and hence they take place in the bulk of the water, particularly for the case of tomato wastewaters. Values of the rate coefficient allow us to establish both the kinetic regime of absorption and to compare the reactivity of ozone with the wastewaters and single compounds.

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Dichromate Reflux Method for Determination of Oxygen Consumed

Cited by 126 publications

References 7 publications

Joint Treatment of Wastewater from Table Olive Processing and Urban Wastewater. Integrated Ozonation - Aerobic Oxidation

Joint Treatment of Wastewater from Table Olive Processing and Urban Wastewater. Integrated Ozonation - Aerobic Oxidation

Integration of continuous biological and chemical (ozone) treatment of domestic wastewater: 1. Biodegradation and post-ozonation

Kinetic Study of the Ozonation of Some Industrial Wastewaters

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