The cathodic microalgae-based MFC converts the nutrients within wastewater and produces oxygen as oxygen supply for cathodic reactions, leading to the reduction of aeration cost. Continuous energy supplies are secured via the studied technology to solve overloaded nutrient and toxic substances discharge into environment, in a sustainable approach. Electricity and biomass produced are sellable as bioenergy and bioproducts, having the potential to generate more income compared to traditional MFC. As result, Chlorella sp. G29-5 has the best performance of nutrient removal, growth and electricity generation compared to other microalgae strains, using immobilized fructose sludge as anode. Immobilized anaerobic inoculum showed higher efficiency on electricity generation compared to suspended anaerobic inoculum. This technology has fully utilized bacteria from sludge and swine manure as microalgae nutrient and generating electricity as output. Cost estimation of other MFC has been included as a reference compared to the current technologies. The capital cost per power generated for this study is $490.46/mW, which is comparatively higher than other systems without concerning the extra income of microalgae biomass generated and nutrient recovered. Replacing expensive catalyst with microalgae is potential to reduce production cost required for MFC and treat wastewater, benefitting the wastewater treatment and power sectors. Consumption of nutrients by microalgae leads to efficient COD removal and aids in controlling severe soil and water pollution.

Graphic abstract

中文翻译：

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使用固定化微藻微生物燃料电池进行生物修复的经济潜力

基于阴极微藻的 MFC 转化废水中的营养物质并产生氧气作为阴极反应的氧气供应，从而降低曝气成本。通过所研究的技术确保持续的能源供应，以可持续的方式解决排放到环境中的过量营养物质和有毒物质。生产的电力和生物质可以作为生物能源和生物产品出售，与传统的 MFC 相比，有可能产生更多的收入。结果，小球藻sp. 与其他微藻菌株相比，G29-5 具有最佳的养分去除、生长和发电性能，使用固定化果糖污泥作为阳极。与悬浮厌氧接种物相比，固定化厌氧接种物显示出更高的发电效率。该技术充分利用污泥和猪粪中的细菌作为微藻营养，发电作为输出。与当前技术相比，其他 MFC 的成本估算已被包括在内作为参考。本研究产生的每单位电力的资本成本为 490.46 美元/mW，在不考虑微藻生物质产生和养分回收的额外收入的情况下，相对于其他系统更高。用微藻代替昂贵的催化剂有可能降低 MFC 和处理废水所需的生产成本，使废水处理和电力部门受益。微藻对养分的消耗可有效去除 COD，并有助于控制严重的土壤和水污染。

图形摘要