Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China; Heavy Metal Pollution Control Key Laboratory of Ordinary Higher College in Hunan Province, PR China.
Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China; Heavy Metal Pollution Control Key Laboratory of Ordinary Higher College in Hunan Province, PR China.
Bioresour Technol. 2015 Aug;190:299-306. doi: 10.1016/j.biortech.2015.04.080. Epub 2015 Apr 29.
The interactions between the soluble extracellular polymeric substances (S-EPS), bound EPS (B-EPS) of algae and heavy metal, would affect the removal of ammonium (NH4(+)-N) and orthophosphate (PO4(3-)-P) from wastewater by algae-based techniques. This study investigated the role of Cd(2+)-mediated EPS from Chlorella vulgaris on NH4(+)-N and PO4(3-)-P removal. The results showed that the removal efficiencies of NH4(+)-N and PO4(3-)-P still separately remained 62.6% and 64.9% under 1.0mg/L Cd(2+), compared to those without Cd(2+), mainly attributing to enhanced S-EPS and B-EPS contents of the algae. The increased of PS (polysaccharides) and PN (proteins, e.g., tryptophan-like and tyrosine-like components) led to accelerated interactions of Cd(2+) with PS and PN in EPS fractions, especially for B-EPS, due to a higher detected distribution of Cd(2+) (e.g., about 55.4% in B-EPS). Thus, algae-based techniques are stable treatment methods for wastewater in which NH4(+)-N and PO4(3-)-P coexist with heavy metals.
藻类的可溶性胞外聚合物（S-EPS）、结合态 EPS（B-EPS）与重金属之间的相互作用，会影响基于藻类的技术从废水中去除铵（NH4(+)-N）和正磷酸盐（PO4(3-)-P）。本研究探讨了 Cd(2+)介导的小球藻 EPS 在 NH4(+)-N 和 PO4(3-)-P 去除中的作用。结果表明，在 1.0mg/L Cd(2+)条件下，NH4(+)-N 和 PO4(3-)-P 的去除率仍分别保持在 62.6%和 64.9%，高于无 Cd(2+)条件，这主要归因于藻类中 S-EPS 和 B-EPS 含量的增加。PS（多糖）和 PN（蛋白质，如色氨酸样和酪氨酸样成分）的增加导致 EPS 各部分中 Cd(2+)与 PS 和 PN 的相互作用加速，特别是对于 B-EPS，因为检测到更多 Cd(2+)的分布（例如，B-EPS 中约有 55.4%）。因此，对于同时含有 NH4(+)-N 和 PO4(3-)-P 与重金属的废水，基于藻类的技术是一种稳定的处理方法。
