p-nitrophenol removal in a sequential anaerobic migrating blanket reactor (AMBR)/aerobic completely stirred tank reactor (CSTR) system

SPONZA D. T., Kuscu O.

PROCESS BIOCHEMISTRY, vol.40, no.5, pp.1679-1691, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 5
  • Publication Date: 2005
  • Doi Number: 10.1016/j.procbio.2004.06.063
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1679-1691
  • Keywords: anaerobic migrating blanket reactor, compartmentalization, p-nitrophenol, p-aminophenol, anaerobic/aerobic sequential, WASTE-WATER, SLUDGE, DEGRADATION, BIOTRANSFORMATION, TOXICITY
  • Dokuz Eylül University Affiliated: Yes


In this study, the anaerobic treatability of p-nitrophenol (p-NP) was investigated in an anaerobic/aerobic sequential reactor system. During the anaerobic stage the target compound is modified via degradation and then the intermediate product is more readily biodegradable by the aerobic phase. Lab-scale anaerobic migrating blanket reactor (AMBR) and a completely stirred tank reactor (CSTR) were used sequentially to investigate the treatability of p-nitrophenol using glucose as primary substrate in continuous fed mode. The COD removal efficiency of synthetic wastewater containing no p-NP was between 90 and 95% after 45 days of the start-up period. The effects of increasing p-NP concentrations on bicarbonate alkalinity, volatile fatty acid accumulation, and methane gas percentage were obtained in AMBR reactor while, NO2-N, NO3-N, NH4-N were monitored as final metabolic products in aerobic CSTR reactor. COD and p-NP removal efficiencies of 94 and 95%, were obtained respectively, in AMBR reactor at a loading rate of 3.85 g p-NP/m(3)/day. The maximum methane production rate and methane percentage (approximately 1000 ml/day and 50%, respectively) was obtained at this loading rate. p-NP was transformed to p-aminophenol (p-AP) in the anaerobic phase. Mineralization of p-AP and phenol was determined in the oxidative aerobic stage. The total p-NP and COD removal efficiencies were found as 96 and 97% at loading rate of 3.85 g p-NP/m(3)/day in whole (anaerobic/aerobic) sequential reactor system, respectively. (c) 2004 Elsevier Ltd. All rights reserved.