Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/99424
Type: Artigo de periódico
Title: Kinetic Studies On A Uasb Reactor Subjected To Increasing Cod Concentration
Author: Paula Jr. D.R.
Foresti E.
Abstract: This paper shows the response of a UASB reactor subjected to increasing influent COD concentrations. The study was carried out using a 10.5 1 UASB reactor continuously operated during ten months, and fed with synthetic wastes prepared daily using glucose, ammonium acetate, methanol and nutrient solution. The flow rate of 16 1.d-1 was held constant throughout the experiment, corresponding to a hydraulic retention time (θ) of 15.6 h. Four intermediate sampling ports besides the influent and effluent ones allowed a study of the reactor behaviour along its vertical profile. For average values of the initial COD concentrations ranging from 1780 to 9700mg. 1-1, corresponding to volumetric loading rates (Bv) of 2.7 to 14.8 kg COD. m-3.d-1, COD removal efficiencies varying from 98 to 80% were achieved. It could be concluded that the step-increase of the influent COD affected the reactor performance in two different ways. First, the reactor could assimilate the shockloads due to the step-increase of the influent COD and B(V), beyond the transient periods following changes in the operation parameters. Second, the overall efficiency decreased gradually with the step-increase of the initial COD and B(V). Kinetic studies indicate that the overall kinetic parameters are probably affected by the step-increase of influent COD concentrations.This paper shows the response of a UASB reactor subjected to increasing influent COD concentrations. The study was carried out using a 10.5 1 UASB reactor continuously operated during ten months, and fed with synthetic wastes prepared daily using glucose, ammonium acetate, methanol and nutrient solution. The flow rate of 16 1.d-1 was held constant throughout the experiment, corresponding to a hydraulic retention time (θ) of 15.6 h. Four intermediate sampling ports besides the influent and effluent ones allowed a study of the reactor behaviour along its vertical profile. For average values of the initial COD concentrations ranging from 1780 to 9700 mg. 1-1, corresponding to volumetric loading rates (BV) of 2.7 to 14.8 kg COD .m-3. d-1, COD removal efficiencies varying from 98 to 80% were achieved. It could be concluded that the step-increase of the influent COD affected the reactor performance in two different ways. First, the reactor could assimilate the shock loads due to the step-increase of the influent COD and BV, beyond the transient periods following changes in the operation parameters. Second, the overall efficiency decreased gradually with the step-increase of the initial COD and BV. Kinetic studies indicate that the overall kinetic parameters are probably affected by the step-increase of influent COD concentrations.
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Rights: fechado
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0026802356&partnerID=40&md5=f367f7377bc65894a21ab1a6cc6f3535
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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