Journal
FUEL
Volume 310, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.122263
Keywords
Olive mill wastewater; High-rate process; Thermophilic anaerobic digestion; Upflow packed bed reactor; Anaerobic inoculum acclimatization
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Funding
- European Union
- Greek national funds through the Regional Operational Program Western Greece 2014-2020 [DER60021057]
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The study focuses on developing a high-rate thermophilic anaerobic digester for treating olive mill wastewater, converting it to biogas to remove organic load amounts and achieve stable treatment conditions. The system shows high potential and can valorize olive mill wastewater without the need for co-digestion.
Olive mill wastewater is the main by-product derived from olive mills using the three-phase extraction process, displaying a serious environmental risk due to its notable content in organics and phenolics. This work focused on a high-rate thermophilic anaerobic digester development, able to remove high organic load amounts, by converting it to biogas. The proposed system is an upflow packed bed reactor with recycling stream and biomass carriers appropriate for inoculum colonization. An anaerobic inoculum was acclimatized under thermophilic conditions and subsequently added into the reactor. Its performance examination against twice-centrifuged olive mill wastewater of 40 g COD/L followed, testing several runs of gradually decreased hydraulic retention time, reaching steady-state conditions until the minimum of 4.2 days, while optimum performance was achieved at 5.6 days. The production of 9.51 +/- 0.37 NLCH4 /L-Feed is considered quite promising for the high-rate anaerobic treatment plants development for olive mill wastewater valorization, without the need of co-digestion.
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