Wastewater resource recovery facilities are major energy consumers in a community, as well as major contributors for greenhouse gas emission. Although anaerobic digestion is widely employed in wastewater treatment to reduce the amount of solid organic waste and the sludge produced, the use of the produced biogas is mostly limited to heating and electricity generation, while the nutrient rich digestate still requires further treatment. In this work, we propose a waste-to-value platform based on a microalgae-methanotroph coculture, which can convert anaerobic digestion-generated biogas into value-added products, while simultaneously removing nutrients from digestate. The platform takes advantage of the synergistic interactions within a microalgae-methanotroph coculture to achieve significantly improved productivity of microbial biomass and enhanced nutrient recovery performance. Using Chlorella sorokiniana–Methylococcus capsulatus (Bath) as the model coculture, we demonstrate that the coculture offers a highly promising platform for waste-to-value technologies, which can efficiently recover energy (from CH₄) and carbon (from both CH₄ and CO₂) to produce microbial biomass, while removing nutrients from wastewater to produce treated clean water. Compared to microalgae monoculture, the coculture achieved 120% improvement in biomass production, 71 and 164% improvement in total nitrogen and total phosphorous removal, respectively, when the same amount of biogas was provided.

废水资源回收设施是社区的主要能源消耗者，也是温室气体排放的主要贡献者。尽管厌氧消化广泛用于废水处理中，以减少固体有机废物和产生的污泥的量，但产生的沼气的使用主要限于加热和发电，而营养丰富的消化物仍需要进一步处理。在这项工作中，我们提出了一个基于微藻-甲烷营养共培养的废物转化价值平台，该平台可以将厌氧消化产生的沼气转化为增值产品，同时从消化物中去除营养。该平台利用了微藻-甲烷营养共培养物中的协同相互作用，从而显着提高了微生物生物量的生产率并提高了养分的回收性能。使用小球藻–荚膜甲基球菌（浴）作为模型的共培养，我们证明了共培养为废物转化为价值的技术提供了非常有前途的平台，该技术可以有效地回收能量（来自CH ₄）和碳（来自CH ₄和CO ₂）以生产微生物生物质，同时从废水中去除养分以产生经过处理的清洁水。与微藻单培养相比，当提供相同数量的沼气时，共培养的生物量产量分别提高了120％，总氮和总磷去除分别提高了71％和164％。