Formation of soluble microbial products and their contribution as electron donors for denitrification
Formation of soluble microbial products and their contribution as electron donors for denitrification
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可溶性微生物产物的形成及其作为反硝化电子供体的贡献
DOI：
10.1016/j.cej.2017.06.063
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发表时间：
2017-10
影响因子：
15.1
通讯作者：
Ma Fang
中科院分区：
文献类型：
--
作者：
Yang Jixian;Zhang Xuening;Sun Yilu;Li Ang;Ma Fang
可溶性微生物产物（SMP）是二级出水中主要的可溶性化学需氧量（sCOD），对出水水质有重要影响。然而，SMP也可以作为一种新的有机碳源，在缺氧条件下为反硝化提供电子。本工作研究了SMP作为电子供体在不同条件下（盛宴，盛宴-饥荒，饥荒）反硝化过程中的贡献。由于有机碳供应充足，只有一部分利用相关产物可以作为反硝化的电子供体。大多数与生物质有关的产品仍留在水中。在饱食-饥饿条件下，以进水TOC和SMP为电子供体，氮（硝酸盐和亚硝酸盐）的去除率分别为86.4和55.2mgN/L。SMP对总氮（TN）去除和总氮（硝酸盐和亚硝酸盐）还原的贡献率分别为33.6%和39.0%。在饥饿条件下，只有SMP可以作为唯一的电子给体。计算出氮（硝酸盐和亚硝酸盐）减少量约为128.7 mg N/L。硝酸盐和总氮的去除率分别为91.4%和51.7%。作为缺氧条件下的电子受体，硝酸盐或亚硝酸盐可以刺激胞外聚合物水解产生SMP。
Soluble microbial products (SMP) cause major soluble chemical oxygen demands (sCOD) in secondary effluent and significantly affect effluent quality. However, SMP can be also treated as new organic carbon resource, which can provide electrons for denitrification under anoxic conditions. This work investigated contribution of SMP as electron donors during denitrification under different conditions (feast, feast–famine, and famine). Only fraction of utilization-associated products could be adopted as electron donors for denitrification in feast condition because of sufficient organic carbon supply. Most biomass-associated products remained in water. In feast-famine condition, the nitrogen (nitrate and nitrite) reduction using influent TOC and SMP as electron donors were 86.4 and 55.2 mg N/L respectively. SMP accounted for 33.6% and 39.0% of total nitrogen (TN) removal and total nitrogen (nitrate and nitrite) reduction, respectively. Only SMP can be adopted as sole electron donors in famine condition. Approximately 128.7 mg N/L of nitrogen (nitrate and nitrite) reduction was calculated. Nitrate and TN removal were 91.4% and 51.7%, respectively. As electron acceptors under anoxic conditions, nitrate or nitrite can stimulate SMP generation from hydrolysis of extracellular polymeric substances.
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影响因子：
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作者：
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通讯作者：
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影响因子：
12.8
作者：
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