Coupling digestion in a pilot-scale UASB reactor and electrochemical oxidation over BDD anode to treat diluted cheese whey

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• 作者：Αthanasia Katsoni (1)
  Dionissios Mantzavinos (2)
  Evan Diamadopoulos (1)
  
• 关键词：Agro ; industrial effluent ; Anaerobic process ; Co ; digestion ; Electrochemical oxidation ; Integrated treatment ; Toxicity ; Transformation by ; products
• 刊名：Environmental Science and Pollution Research
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：21
• 期：21
• 页码：12170-12181
• 全文大小：1,185 KB
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• 作者单位：Αthanasia Katsoni (1)
  Dionissios Mantzavinos (2)
  Evan Diamadopoulos (1)
  
  1. Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, 73100, Chania, Greece
  2. Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, 26504, Patras, Greece
  
• ISSN：1614-7499

文摘

The efficiency of the anaerobic treatment of cheese whey (CW) at mesophilic conditions was investigated. In addition, the applicability of electrochemical oxidation as an advanced post-treatment for the complete removal of chemical oxygen demand (COD) from the anaerobically treated cheese whey was evaluated. The diluted cheese whey, having a pH of 6.5 and a total COD of 6?g/L, was first treated in a 600-L, pilot-scale up-flow anaerobic sludge blanket (UASB) reactor. The UASB process, which was operated for 87?days at mesophilic conditions (32?±-?°C) at a hydraulic retention time (HRT) of 3?days, led to a COD removal efficiency between 66 and 97?%, while the particulate matter of the wastewater was effectively removed by entrapment in the sludge blanket of the reactor. When the anaerobic reactor effluent was post-treated over a boron-doped diamond (BDD) anode at 9 and 18?A and in the presence of NaCl as the supporting electrolyte, complete removal of COD was attained after 3-?h of reaction. During electrochemical experiments, three groups of organochlorinated compounds, namely trihalomethanes (THMs), haloacetonitriles (HANs), and haloketons (HKs), as well as 1,2-dichloroethane (DCA) and chloropicrin were identified as by-products of the process; these, alongside free chlorine, are thought to increase the matrix ecotoxicity to Artemia salina.