The production of cyanobacterial carbon under nitrogen-limited cultivation and its potential for nitrate removal
The production of cyanobacterial carbon under nitrogen-limited cultivation and its potential for nitrate removal
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限氮培养下蓝藻碳的产生及其去除硝酸盐的潜力
DOI：
10.1016/j.chemosphere.2017.09.125
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发表时间：
2018-01-01
期刊：
影响因子：
8.8
通讯作者：
Chen, Xuechu
中科院分区：
文献类型：
--
作者：
Huang, Yingying;Li, Panpan;Chen, Xuechu
有害的蓝藻水华（Cyanohabs）是对水生生态系统的严重威胁。对这些有害微生物的有益利用将是解决这一紧迫问题的一个有希望的办法。本研究采用一种简单的方法，氮限制，培养蓝藻的目的是生产蓝藻碳反硝化。在氮限制条件下，常见的蓝藻微囊藻能够高效利用硝酸盐，并具有较高的胞内C/N比。更重要的是，有机碳很容易从其干粉中浸出;这些浸出液是可生物降解的，含有大量的溶解有机碳（DOC）和碳水化合物，但溶解总氮（DTN）和蛋白质的量较少。当应用于具有沉积物-水界面的缺氧系统时，观察到比NO（X）对bar-N的去除速率显著增加，是对照的14.2倍。本研究首先表明，氮限制培养是一种有效的方式，以诱导有机和碳水化合物积累的蓝藻，以及一个高的C/N比，这些蓝藻可以作为一个有前途的碳源反硝化。结果表明，作为碳源应用不仅是利用蓝藻的一种新途径，而且有助于去除水体中的氮，进一步限制了蓝藻的增殖。(C)2017由Elsevier Ltd.出版
Harmful cyanobacterial blooms (CyanoHABs) represent a serious threat to aquatic ecosystems. A beneficial use for these harmful microorganisms would be a promising resolution of this urgent issue. This study applied a simple method, nitrogen limitation, to cultivate cyanobacteria aimed at producing cyanobacterial carbon for denitrification. Under nitrogen-limited conditions, the common cyanobacterium, Microcystis, efficiently used nitrate, and had a higher intracellular C/N ratio. More importantly, organic carbons easily leached from its dry powder; these leachates were biodegradable and contained a larger amount of dissolved organic carbon (DOC) and carbohydrates, but a smaller amount of dissolved total nitrogen (DTN) and proteins. When applied to an anoxic system with a sediment-water interface, a significant increase of the specific NO(X) over bar-N removal rate was observed that was 14.2 times greater than that of the control. This study first suggests that nitrogen-limited cultivation is an efficient way to induce organic and carbohydrate accumulation in cyanobacteria, as well as a high C/N ratio, and that these cyanobacteria can act as a promising carbon source for denitrification. The results indicate that application as a carbon source is not only a new way to utilize cyanobacteria, but it also contributes to nitrogen removal in aquatic ecosystems, further limiting the proliferation of CyanoHABs. (C) 2017 Published by Elsevier Ltd.