Techno-economic analysis of the olive oil mill wastewater steam reforming process: A case-study.

Steam reforming of olive oil mill wastewater (OMW) has been object of study in several works; however, there are no references to industrial installations to treat and valorize this effluent until now. In this way, to understand the economic impact of applying this technology in the olive oil industry, techno-economic analyses of this process in a traditional reactor (TR) or in a sorption-enhanced reactor (SER – with in situ CO 2 removal) were performed. This study focused on key aspects of the process units, such as the reaction and heating/cooling zones. These analyses also considered the effect of different water contents in the OMW composition (60–90 wt.%) and the impact of the operating pressure (1–4 bar), at 400 ºC. To determine the outlet stream composition of the process and the heat released or required in the reaction, the software Aspen Plus V.10® was used. The investment cost of the heat exchanger was estimated by the Aspen Exchanger Design & Rating software tool. It was observed that the content of water in the feed, the operating pressure, the mode of operation (6 or 12 months) and the reactor configuration used affect the economic benefit of the project over time: lower content of water in the feed, lower operating pressure, operating throughout the whole year and the utilization of a SER allows to obtain a most profitable scenario. [Display omitted] • A techno-economic analysis for the olive oil mill wastewater steam reforming process is performed. • The application of a Heat Exchanger Network for the energy integration of the process is proposed. • The re-utilization of the water generated in the process of the olive oil production is proposed. • It is observed that the operation during the whole year and low water content in the feed rise the project profitability. • For the best scenario, the IRR and NPV are equal to 74 % and 18 M€. [ABSTRACT FROM AUTHOR]