Evaluation of a upflow anaerobic sludge blanket reactor with partial recirculation of effluent used to treat wastewaters from pulp and paper plants |
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| Authors: | Buzzini A P Pires E C |
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| Institution: | 1. Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutions, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China;2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China;1. Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), A. João Dagnone 1100, 13563-120, São Carlos, SP, Brazil;2. Department of Marine Science, Federal University of São Paulo, A. Saldanha da Gama, 89, Ponta da Praia, 11030-400, Santos, SP, Brazil;1. Department of Civil Engineering, Universidade Federal de Viçosa, Av. P.H. Rolfs, 36570-900, Brazil;2. Department of Forest Engineering, Universidade Federal de Viçosa, Av. P.H. Rolfs, 36570-900, Brazil;3. Department of Agricultural Engineering, Universidade Federal de Viçosa, Av. P.H. Rolfs, 36570-900, Brazil;4. Chemical Department, Universidade Federal de Viçosa, Av. P.H. Rolfs, 36570-900, Brazil;1. Renewable Energy and Environment Laboratory, Faculty of Science, University Ibn Tofail, Kenitra, Morocco;2. Agroressource, Polymer and Process Engineering Laboratory, Faculty of Sciences, Ibn Tofail, University, Kenitra, Morocco |
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| Abstract: | The main purpose of this study was to evaluate the performance of a UASB reactor treating diluted black liquor from a Kraft pulp mill, which simulates an unbleached Kraft plant wastewater, under different operational conditions, including partial recycling of the effluent. The reactor's performance was evaluated from the standpoint of COD, pH, volatile acid concentration, alkalinity, concentration of methane in the biogas, and microbiological examinations of the sludge. Without recirculation the reduction of the HRT from 36 to 30h did not significantly affect the average COD removal efficiency. The parameter displaying the greatest variation was the average concentration of effluent volatile acids, which increased by 16%. With recirculation the reduction of the HRT from 30 to 24h increased the average COD removal efficiency from 75% to 78%. In this case, the average effluent alkalinity also showed an increase. The use of partial recirculation of the effluent did not improve significantly the COD removal under the operational conditions tested in this work, but it was possible to operate the reactor with lower hydraulic retention time without disintegration of the granules. |
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