Abstract
ABSTRACT The hydrogen is a fuel with a high energy density. Studies have sought to verify the potential of different residues and configurations of reactors in the production of biohydrogen. This study evaluated the influence of the organic loading rate on the production of biohydrogen from cassava starch wastewater (CSW) in anaerobic sequencing batch biofilm reactors (AnSBBR) operated in a fed-batch. In the tests, the organic loading rates of 9.0; 13.5 and 18.0 gCT L−1 d−1 were used, at cycle times (CT) of 4; 4 and 2 h (tests I, II and III, respectively). The reactor was inoculated with sludge from a pilot anaerobic reactor used in the treatment of CSW, heat treated (heated at 90°C for 15 min). With the increase of the organic load (condition I to II) with the same cycle time (CT: 4 h), there were increases in the hydrogen molar productivity (PrM) and hydrogen yield in relation to applied total carbohydrate (RMCA) and removed (RMCR). However, with the increase in the organic loading rate in which the CT was reduced from 4 to 2 h (condition II to III), there was a decrease in PrM and RMCA and RMCR. The best performance of the reactor was verified in condition II (organic loading rate: 13.5 gTC L− 1 d−1; CT: 4 h), in which the PrM was 35.8 molH2 m−3 d−1 and RMCA and RMCR were 2.24 and 3.67 molH2 kgTC−1, respectively.
Highlights
The hydrogen is considered a promising substitute for fossil fuels because it has a high energy density, but the techniques normally employed in its production, such as fossil fuel reform and water electrolysis, require high energy consumption
The aim of this study was to evaluate the influence of the organic loading rate on the production of biohydrogen, from the cassava starch wastewater in anaerobic sequencing batch biofilm reactors (AnSBBR) operated in a fed-batch
The final volume was obtained after the correction for the normal conditions of temperature and pressure (NCTP) (Equation 1), where: Pr corresponds to atmospheric pressure; Vr is the volume of gas at the test conditions; Tr is the temperature at which the reactor was subjected (°C); PNCTP is the atmospheric pressure at NCTP (760 mmHg); VNCTP is the volume of gas in the NCTP; TNCTP represents the temperature in the NCTP (273 K - 0oC)
Summary
The hydrogen is considered a promising substitute for fossil fuels because it has a high energy density, but the techniques normally employed in its production, such as fossil fuel reform and water electrolysis, require high energy consumption. According to Manssouri et al (2013) and Lovato et al (2015), the agroindustrial effluents have the potential for the production of biohydrogen in anaerobic reactor, due to its composition rich in carbohydrates. The wastewater from cassava processing industries is treated in anaerobic lagoons, which results in the release of greenhouse gases into the atmosphere and wide area requirements. According to Thanwised et al (2012), this effluent rich in starch is a promising substrate for biotechnological processes, being able to obtain up to 10 m3 of biogas from 1 m3 of the wastewater. The cassava starch wastewater (CSW) is rich in organic matter of easy degradation, it can be considered a substrate with high potential for the biological production of hydrogen (energy generation), contributing to the sustainability of the starch production process
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