期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 70, 期 10, 页码 3219-3227出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c08100
关键词
anaerobic co-digestion; olive washing water; olive oil washing water; olive mill solid waste; Raphidocelis subcapitata; nutrient removal; wastewater treatment; circular economy
资金
- Ramon y Cajal Program from the Spanish Ministry of Economy and Competitiveness [RYC-2011-08783]
- Regional Government of Andalucia
- Junta de Andalucia
- Consejeria de Economia Innovacion, Ciencia y Empleo [RNM-1970]
This study evaluates and comprehensively utilizes the byproducts of the two-phase olive oil elaboration process, by using olive washing water and olive oil washing water as a culture medium to grow microalgae, and then conducting anaerobic co-digestion of the microalgal biomass and olive mill solid waste. It achieves the full valorization and circular utilization of all the byproducts generated in the two-phase olive oil process.
This study evaluates the comprehensive valorization of the byproducts derived from the two-phase olive oil elaboration process [i.e., olive washing water (OWW), olive oil washing water (OOWW), and olive mill solid waste (OMSW)] in a closed-loop process. Initially, the microalga Raphidocelis subcapitata was grown using a mixture of OWW and OOWW as the culture medium, allowing phosphate, nitrate, sugars, and soluble chemical oxygen demand removal. In a second step, the microalgal biomass grown in the mixture of washing waters was used as a co-substrate together with OMSW for an anaerobic co-digestion process. The anaerobic co-digestion of the combination of 75% OMSW-25% R. subcapitata enhanced the methane yield by 7.0 and 64.5% compared to the anaerobic digestion of the OMSW and R. subcapitata individually. This schedule of operation allowed for integration of all of the byproducts generated from the two-phase olive oil elaboration process in a full valorization system and the establishment of a circular economy concept for the olive oil industry.
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