Ammonia recovery from organic nitrogen in synthetic dairy manure with a microbial fuel cell
Ammonia recovery from organic nitrogen in synthetic dairy manure with a microbial fuel cell
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DOI：
10.1016/j.chemosphere.2023.138388
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发表时间：
2023-03-20
期刊：
影响因子：
8.8
通讯作者：
Qin, Mohan
中科院分区：
文献类型：
--
作者：
Burns, McKenzie;Qin, Mohan
畜牧业和农田农业部门的压力越来越大，导致人们认识到动物废物管理和氨基肥料供应方面的问题。生物电化学系统（BES）是一种新时代的技术，提供了一种解决这些问题的方法。微生物燃料电池（Microbial fuel cell，MFC）是BES的一种，传统上用于微生物降解有机物发电，但也可用于从废物中回收营养物质，同时处理。本研究以简单氨基酸甘氨酸为有机氮源，研究了一种用于从合成牛粪有机氮中回收氨的MFC。我们使用五种不同的合成肥料组合物来确定它们对MFC性能的影响，并且发现当与没有有机N的基础条件相比时，有机N条件下的性能牺牲最小。MFC在所有有机氮条件下实现了大于90%的COD去除。在有机氮条件下，氮（N）的去除率达到40%和60%之间，这表明有机氮可以用作氨矿化的基质，并进一步作为肥料回收。此外，我们发现MFC主要由Bacteroidota，Firmicutes，Proteobacteria和Halobacterota的产电生物组成，Bacteroidota和Firmicutes中的生物能够矿化N。最后，我们发现，在orgN是稀缺的，唯一的N源提供的条件下，微生物优先降解有机物从其他死亡的生物体，特别是作为N源。这增加了MFC系统中的N浓度，并为从有机N回收氨而操作的MFC引入了重要的操作限制。
Increasing pressures on the animal and cropland agriculture sectors have led to the realization of problems with animal waste management and ammonia-based fertilizer supply. Bioelectrochemical systems (BES) are a new-age technology that offer a way to address these problems. Microbial fuel cells (MFCs), one type of BES, are tradi-tionally used for electricity generation from microbial degradation of organic matters, but can also be used to recover nutrients from wastes simultaneous with treatment. This research investigated an MFC for ammonia recovery from the organic nitrogen (orgN) fraction of synthetic dairy manure, using the simple amino acid glycine as the orgN source. We used five different synthetic manure compositions to determine their effects on MFC performance, and found minimal sacrifices in performance under orgN conditions when compared to the base condition without orgN. The MFC achieved greater than 90% COD removal in all orgN conditions. Nitrogen (N) removal efficiencies of between 40% and 60% were achieved in orgN conditions, indicating that organic nitrogen can be used as the substrate for ammonia mineralization and further recovery as fertilizer. In addition, we found the MFC was largely populated by electrogenic organisms from the phyla Bacteroidota, Firmicutes, Proteobacteria, and Halobacterota, with organisms in both Bacteroidota and Firmicutes capable of N minerali-zation present. Lastly, we found that in conditions where orgN is scarce and the only N source provided, microbes preferentially degraded organic matter from other dead organisms, especially as an N source. This increases the concentration of N in the MFC system and introduces important operational constraints for MFCs operated for ammonia recovery from orgN.