Abstract
A device (prototype) with a working volume of 200 L was used to deplete olive mill wastewater (OMW) of polyphenols. The OMW transformed into feedstock by means of the device was then used for feeding a lab-scale photobioreactor, just for testing the production of bioH2. The main novelty of this prototype consists in the combination of several adsorbent matrices and the exploitation of their synergic action. In this investigation, three matrices have been used: active carbon, Azolla and zeolite. The device was operated at an olive oil company located in the heart of the Chianti zone (Province of Florence, Italy). The efficiency of polyphenol removal obtained using the device was ≥96%. The multi-matrix effluent (MMeff) generated was then used to obtain three different culture broths containing 25%, 50% and 100% of MMeff, respectively. The diluted (with water) culture broths were suitable for hydrogen generation, with the highest hydrogen production rate (12.7 mL H2/Lculture/h) being obtained using 50% MMeff. The hydrogen yields were: 334 mL H2/L of MMeff, when feeding the photofermenter with pure effluent (100%); 1308 mL H2/L of MMeff, with the half-diluted effluent (50%, v/v); and 432 mL H2/L of MMeff, with the highest-diluted effluent (25%, v/v).
Highlights
Approaches to the use of waste materials as feed for efficient hydrogen production processes have been widely studied [1,2]
The pretreatment process consisted of phases of sequential adsorption performed using the new prototype, in which three different matrices worked together to adsorb PPs
Compared to photofermentation involving the use of raw olive mill wastewater (OMW), the amount of photofermentative hydrogen production was doubled by exploiting the effluent of the clay pretreatment process
Summary
Approaches to the use of waste materials as feed for efficient hydrogen production processes have been widely studied [1,2]. Pre-treated olive mill wastewater (OMW) has been proposed as a precursor for obtaining a suitable feedstock for the photo-production of hydrogen [3,4,5]. The content of these latter biomolecules is the primary cause of the phytotoxic and antimicrobial effects of OMW. Their inhibitory effect on bacterial growth makes the direct biological treatment of OMW challenging, as discussed by El Hajjouji et al [8]
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