Ho Que Nguyen, Hidaka Taira, Rahman Mukhlis A, Yoshida Naoko
Department of Civil Engineering, Nagoya Institute of Technology Nagoya Japan
Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto University Katsura Nishikyo Kyoto 615-8540 Japan.
RSC Adv. 2024 Aug 22;14(36):26484-26493. doi: 10.1039/d4ra04672b. eCollection 2024 Aug 16.
Microbial fuel cells (MFCs) are a promising technology that directly converts organic matter (OM) in wastewater into electricity while simultaneously degrading contaminants. However, MFCs are insufficient for the removal of nitrogenous compounds. Therefore, the post-treatment of MFCs is essential. This study was the first to use natural zeolite adsorption integrated with photosynthesis (ZP) for post-treating MFCs. In this system, no external energy was required; instead, natural light was used to promote the growth of photosynthetic microorganisms, thereby enhancing contaminants removal through the photosynthesis process. To assess the effectiveness of the method, comparisons were conducted under two conditions: dark (no photosynthesis) and light (with photosynthesis). In darkness, extending hydraulic retention time (HRT) enhanced COD and BOD removal by 19.8% and 28.9%, respectively. When exposed to natural light, improvements were even more notable, with COD and BOD removal reaching 32% and 40%, respectively. In both conditions, the method effectively removed NH , achieving 60% efficiency in darkness and 84.5% in light. This study showed that the adsorption capacity of the zeolite reached saturation when the cumulative liquid volume per unit weight of the zeolite exceeded 0.2 L g. The key functional photosynthetic microbes were investigated using 16S rRNA and 18S rRNA. This revealed the presence of microorganisms such as , , , and , which likely play a role in enhancing the efficiency of photosynthesis in removing contaminants. The study findings indicated that the integration of MFCs-ZP represents an eco-friendly approach capable of resource recovery from wastewater while also meeting discharge standards.
微生物燃料电池（MFCs）是一项很有前景的技术，可将废水中的有机物（OM）直接转化为电能，同时降解污染物。然而，MFCs在去除含氮化合物方面存在不足。因此，MFCs的后处理至关重要。本研究首次采用天然沸石吸附与光合作用相结合（ZP）的方法对MFCs进行后处理。在该系统中，无需外部能源；相反，利用自然光促进光合微生物的生长，从而通过光合作用过程提高污染物的去除率。为评估该方法的有效性，在两种条件下进行了比较：黑暗（无光合作用）和光照（有光合作用）。在黑暗中，延长水力停留时间（HRT）分别使化学需氧量（COD）和生化需氧量（BOD）的去除率提高了19.8%和28.9%。当暴露在自然光下时，改善更为显著，COD和BOD的去除率分别达到32%和40%。在两种条件下，该方法都能有效去除氨氮，黑暗中去除效率达到60%，光照下达到84.5%。本研究表明，当每克沸石的累积液体体积超过0.2 L g时，沸石的吸附容量达到饱和。使用16S rRNA和18S rRNA对关键的功能性光合微生物进行了研究。结果表明存在诸如 、 、 和 等微生物，它们可能在提高光合作用去除污染物的效率方面发挥作用。研究结果表明，MFCs-ZP的结合是一种生态友好的方法，既能从废水中回收资源，又能达到排放标准。
