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Performance of p-nitrophenol (p-NP) fed sequential anaerobic migrating blanket reactor (AMBR)/aerobic completely stirred tank reactor (CSTR) system under increasing organic loading conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
18139 42713 2007 9 PDF Available
Title
Performance of p-nitrophenol (p-NP) fed sequential anaerobic migrating blanket reactor (AMBR)/aerobic completely stirred tank reactor (CSTR) system under increasing organic loading conditions
Abstract

In this study the anaerobic treatability of p-nitrophenol (p-NP) was investigated in an anaerobic/aerobic sequential reactor system under increasing organic loadings during operation period of 186 days. Lab-scale anaerobic migrating blanket reactor (AMBR)/completely stirred tank reactor (CSTR) system consisted of effective volumes of 13.5 and 9 L, respectively. Synthetic wastewater was obtained from constant p-NP concentration of 40 mg/L and a glucose concentration giving 3000 mg/L COD as primary substrate. The studies were carried out in continuous mode and the effluent of the AMBR reactor was used as the feed for the CSTR reactor. The AMBR/CSTR reactor system was operated at organic loading rates (OLRs) increasing from 0.31 to 3.25 kg/m3 day. COD and p-NP removal efficiencies were decreased from 92% to 79% and from 94% to 86%, respectively, when the COD loading rates were increased from 0.31 to 3.25 kg/m3 day in AMBR. The total COD and p-NP removal efficiencies were 94% and 91% in whole (AMBR/CSTR) reactor system, at a COD loading rate of 3.25 kg/m3 day, respectively. The total gas and methane gas production increased with increased OLRs. The daily total and methane gas productions were 12.25 and 3.8 L/day at OLR of 3.25 kg/m3 day, respectively. Methane gas percentage was also found as 31% at this loading rate.In this study, pH, total volatile fatty acid (TVFA) and bicarbonate alkalinity (BA)/total volatile fatty acid (TVFA) ratios variations in the effluent and in the all compartment of the AMBR were suitable for optimal anaerobic treatment at all OLRs. The pH, TVFA and BA/TVFA ratios in the effluent and in all the compartments of the AMBR were obtained between 7.2–7.64, 290–353 mg/L and 0.06–0.13, respectively, at OLR of 3.25 kg/m3 day. A 79–92% of the p-NP transformed to p-amino phenol (p-AP) in anaerobic phase. The generation of phenol and ammonia (NH4-N) was observed during the anaerobic degradation. A complete mineralization of p-AP (E = 100%) was found in the aerobic phase. The p-AP, phenol and NH4-N were converted to nitrite (NO2-N), nitrate (NO3-N) and CO2 as end products in the aerobic step.

Keywords
Anaerobic migrating blanket reactor; Compartmentalization; p-Nitrophenol; p-Aminophenol; Anaerobic/aerobic sequential
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Performance of p-nitrophenol (p-NP) fed sequential anaerobic migrating blanket reactor (AMBR)/aerobic completely stirred tank reactor (CSTR) system under increasing organic loading conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 40, Issue 5, 3 April 2007, Pages 1026–1034
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us