Wet air oxidation and activated sludge treatment of phenolic wastewater

Lin, Sheng H.; Chuang, Tien-Deng

doi:10.1080/10934529409376054

Cited by 19 publications

(14 citation statements)

References 8 publications

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“…2.2.1 Partitioned first order kinetics model. Partitioned first order kinetics model is to divide a reaction into rapid reaction step and slow reaction step, with each step being fitted by first order kinetics formula [9,10] . Assuming that oxygen gas was excessive and organic matter oxidation rate presented a first order relation with concentration, then d , d Thereinto, k i (i=1,2) is the rate constant of each step, C is the organic matter concentration, detected by TOC (mg/L).…”

Section: Dynamics Characteristics Of Wao Of Non-ionic Surfactantsmentioning

confidence: 99%

Study on dynamics characteristics of wet air oxidation of non-ionic surfactants

Zeng

Tang

Zhao

et al. 2008

Sci. China Ser. B-Chem.

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Wet air oxidation is an effective method to deal with highly concentrated nondegradable emulsification wastewater which contains non-ionic surfactants. This article illustrates our investigation on dynamic characteristics of wet air oxidation of typical non-ionic surfactants like polyether, phenol ether and widely used alcohol ether. The experimental results indicated that the oxidation rate of polyether, phenol ether and alcohol ether obviously ascended as the temperature rose. A good oxidation effect was available at 240℃. The TOC removal rate could reach 88.0%, 94% and 91.5%, after 125 min reaction. Alcohol ether was prone to an easier oxidation compared with polyether and phenol ether when the temperature was 220℃ or below. The oxidation rate of alcohol ether was higher than that of polyether at 160℃, while the oxidation rate of polyether was higher than that of phenol ether between 180℃ and 220℃. During the later period of the reaction at 240℃, the rate of phenol ether was higher than that of alcohol ether, which was still higher than that of polyether. Partitioned first order kinetics model analysis showed that the apparent activation energy of alcohol ether was lower than that of both polyether and phenol ether in the leading stage and lagging stage, and it was easy to acquire a higher oxidation rate for alcohol ether at low temperature. Three parameter general dynamics model analyses showed that the reason why the oxidation rate of polyether was lower than that of alcohol ether was that the oxidation of polyether was more apt to be converted to intermediate production than that of alcohol ether, whereas between 200℃ and 220℃, the direct oxidation rate of polyether and the oxidation rate of intermediate product were obviously lower than that of alcohol ether. The apparent activation energy of direct and indirect oxidation of polyether was 43.37 and 60.45 kJ⋅mol −1 , respectively, while the corresponding apparent activation energy of alcohol was 38.74 and 58.09 kJ·mol −1 , respectively.polyether, phenol ether, alcohol ether, wet air oxidation, dynamics characteristicThe emulsification wastewater from machinery industry is a kind of highly concentrated nondegradable organic wastewater, and always contains massive non-ionic surfactants. The emulsification wastewater concerned in this article mainly contained polyoxyethylene polyoxypropylene ether (a segmented copolymer formed by addition reaction of propylene oxide and epoxy ethane using propanediol as the initiative reactant, and its general formula is HO(C 2 H 4 O) a (C 3 H 6 O) b (C 2 H 4 O) c H, called polyether or GPE for short below, thereinto b is at least 15. Its average molecular weight is about 3000, trade name is GPE2035, and its COD contribution ratio of COD of the wastewater is 53.0%) and polyoxyethylene nonyl phenyl ether ( , thereinto R is C 9 , n is 10, called phenolic ether or TX10 for short below. The contribution ratio of COD is 25.2%).

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Section: Dynamics Characteristics Of Wao Of Non-ionic Surfactantsmentioning

confidence: 99%

Study on dynamics characteristics of wet air oxidation of non-ionic surfactants

Zeng

Tang

Zhao

et al. 2008

Sci. China Ser. B-Chem.

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“…Phenols and chlorophenols. A wastewater containing high concentrations of phenol and phenolic compounds was treated using a combination of wet air oxidation (WAO) followed by aerobic biological treatment (Lin and Chuang, 1994).The success of the combined process was a function of the strength of the incoming wastewater and some multicomponent wastes with high initial COD concentrations were not effectively treated. The extent and rate of adsorption and biodegradation of2-chlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol by activated sludge was evaluated (Parker et al, 1994b).…”

Section: Fate and Effects Of Xenobioticsmentioning

confidence: 99%

Activated sludge and other aerobic suspended culture processes

Cowan¹,

Alagappan²,

Ellis³

et al. 1997

Water Environment Research

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PROCESS MODELING AND KINETICS Models. Kappeler and Gujer (1994b) introduced a simulation model, ANTISCUM, formulated to describe scumming due to actinomycetes. The model was capable of predicting scumming for the conditions under which it is often found; small concentrations of surfactants and substantial concentrations of hydrophobic substrate, both of which may lead to proliferation of AClinomyceles.

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“…For integrated WAO-biological treatment process, more detailed studies concerning the WAO pretreatment step are necessary for the design of a rational and efficient integrated process. The WAO process has been subjected to numerous investigations by researchers in the past decades as a pretreatment step before the biological treatment [29][30][31][32].…”

Section: Applicationmentioning

confidence: 99%