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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 7, 2014, pp. 1881-1896
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Bioline Code: st14184
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 7, 2014, pp. 1881-1896
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Experimental evaluation of anaerobic digestion for coffee wastewater treatment and its biomethane recovery potential
Beyene, A.; Yemane, D.; Addis, T.; Assayie, A.A. & Triest, L.
Abstract
The objective of this study was to evaluate the
performance of anaerobic digestion (AD) as an ecofriendly
technology for coffee wastewater (CWW) management.
First, we have characterized the CWW and found
that it is suitable for microbial degradation with pH
adjustment. Then, we designed a simple anaerobic batch
reactor (ABR) and evaluated its potential for energy yield
and efficiency to remove pollutants. The experiment was
carried out by operating the anaerobic digestion (AD) for
70 days. The ABR was found to be efficient for the
removal of organic load (90 %), nutrients (82 %) and
suspended solids (95 %) from coffee processing waste. The
increased removal efficiency of pollutants was dependent
on the hydraulic retention time of the system. We also
estimated that the coffee waste has a potential to produce a
theoretical energy yield of 4–10 million KJ/day and an
organic fertilizer (digestate) of 18.8–25.2 kg VSS/day. As
a result, the AD would be a more sensible consideration as
an eco-friendly treatment option for the coffee waste. The
use of AD for CWW treatment not only reduces emission
of greenhouse gases to the environment but also circumvents
the rising demand for fuel wood and charcoal that
causes a severe deforestation in the coffee growing regions
of the world.
Keywords
Anaerobic digestion; Biogas potential; Coffee wastewater; Organic fertilizer
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