| Abstrakt: |
Waste biorefineries have significant potential to utilize microbial electrolysis cells (MECs) to convert waste into energy carriers and bioproducts with added value, potentially resulting in a carbon- and energy-negative system. Various feedstocks (such as sodium acetate, glucose, glycerol, and wastewater) are used in MEC for biohydrogen production. This study used the three different wastewaters as substrates in the MEC for biohydrogen production. The remaining dried microalgal biomass was then analyzed to identify value-added compounds. Under conditions of 18±3°C, domestic wastewater (DWW) produced maximum biohydrogen (22.78±0.25 mL/L). Combined domestic wastewater and algal extracted supernatant (CDAES) resulted in a higher yield (30.82±0.25 mL/L), and modified wastewater (MWW) exhibited the highest production (40.86±0.25 mL/L). The biohydrogen production values in this study exceed those reported in the latest research, considering the applied voltage of 0.5 V. Scanning electron microscope (SEM) images confirmed the formation of rod-shaped and round-shaped microbial communities on the anode surface. The cultivation conditions for Chlorella sorokinianain a multi-cultivator system were set (23–26°C, 98 μmol m−2s−1, pH 7.0 ± 0.5, and CO20.04 %). The Gas Chromatography-Mass Spectrometry (GC-MS) analysis of dried algal biomass has revealed eighteen bioactive compounds with diverse applications in pharmacy, food, and cosmetics. Thus, the algal extracted supernatant incorporated into wastewater demonstrated an innovative and economical feedstock for MEC. Additionally, bioactive compounds play a prominent role in the success of integration technologies, opening a new avenue for research. |
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