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Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

Paper ID Volume ID Publish Year Pages File Format Full-Text
33344 44971 2013 8 PDF Available
Title
Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water
Abstract

Septic tanks are used for the removal of organic particulates in wastewaters by physical accumulation instead of through the biological production of biogas. Improved biogas production in septic tanks is crucial to increase the potential of this system for both energy generation and organic matter removal. In this study, the effect on the biogas production and biogas quality of coupling a 20 L lab-scale septic tank with a microbial electrolysis cell (MEC) was investigated and compared with a standard septic tank. Both reactors were operated at a volumetric organic loading rate of 0.5 gCOD/L d and a hydraulic retention time between 20 and 40 days using black water as an input under mesophilic conditions for a period of 3 months. The MEC-septic tank was operated at an applied voltage of 2.0 ± 0.1 V and the current experienced ranged from 40 mA (0.9 A/m2 projected electrode area) to 180 mA (5 A/m2 projected electrode area). The COD removal was of the order of 85% and the concentration of residual COD was not different between both reactors. Yet, the total phosphorous in the output was on average 39% lower in the MEC-septic tank. Moreover, the biogas production rate in the MEC-septic tank was a factor of 5 higher than in the control reactor and the H2S concentration in the biogas was a factor of 2.5 lower. The extra electricity supplied to the MEC-septic tank was recovered as extra biogas produced. Overall, it appears that the combination of MEC and a septic tank offers perspectives in terms of lower discharge of phosphorus and H2S, nutrient recuperation and a more reliable supply of biogas.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A septic tank assisted with a MEC is proposed for the treatment of black water. ► The MEC-septic tank enhanced biogas production and quality. ► Lower P concentrations in the effluent and lower H2S in the biogas were observed. ► The system offers perspectives for a better biogas supply and nutrient recovery.

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Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water
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Publisher
Database: Elsevier - ScienceDirect
Journal: New Biotechnology - Volume 30, Issue 5, 25 June 2013, Pages 573–580
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