alexa <p>Performance of Anaerobic Bioreactors under Diurnally Cyclic Air Temperatures: A Spectral Analysis Approach to Biogas Production</p> | OMICS International | Abstract
ISSN: 2155-9821

Journal of Bioprocessing & Biotechniques
Open Access

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Research Article

Performance of Anaerobic Bioreactors under Diurnally Cyclic Air Temperatures: A Spectral Analysis Approach to Biogas Production

EA Echiegu1, AE Ghaly2*and VV Ramakrishnan2
1Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria
2Department of Process Engineering and Applied Sciences, Dalhousie University, Halifax, Nova Scotia, Canada
Corresponding Author : Abdel E Ghaly
Process Engineering Department
Dalhousie University, Halifax Nova Scotia, Canada
Tel: (902) 494-6014
Email: [email protected]
Received December 11, 2013; Accepted December 18, 2013; Published December 27, 2013
Citation: Echiegu EA, Ghaly AE, Ramakrishnan VV (2013) Performance of Anaerobic Bioreactors under Diurnally Cyclic Air Temperatures: A Spectral Analysis Approach to Biogas Production. J Bioprocess Biotech 4:143 doi: 10.4172/2155-9821.1000143
Copyright: © 2013 Echiegu EA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

The effects of two diurnally cyclic temperature ranges (20-40°C and 15-25°C) and four levels of hydraulic retention times (25, 20, 15, and 10 d) on the performance of anaerobic reactors operated on screened dairy manure were evaluated. The reactor temperature exhibited a lag relative to the chamber air temperature. For the 20-40°C temperature cycle, the average lags period at the maximum and minimum chamber temperatures 3.75 and 4.37 h, respectively. For the 15-25°C temperature cycle, the average lag periods at maximum and minimum chamber temperatures were 3.61 and 4.34 h, respectively. The effluent solids content were not adversely affected by the reactor diurnally cyclic temperature. The effluent total solids and methane content of the biogas diurnally cyclic patterns were out of phase with the diurnally cyclic pattern of the reactor temperature by about 12 hours under most operating conditions. The reductions in total solids and methane yield were all significantly affected by the diurnal temperature range and hydraulic retention time. Biogas production from a healthy digester operating under a diurnally cyclic temperature environment follow a sinusoidal pattern which can be described by a Fourier equation of the form. However, where the operating conditions are not favourable, the production followed a sinusoidal pattern which may be embedded in some harmonic and noise.

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