Crimp A, Brown N, Shilton A
School of Engineering and Advanced Technology, Massey University, Private Bag 11-222, Palmerston North, New Zealand E-mail:
Water Sci Technol. 2018 Aug;78(1-2):165-173. doi: 10.2166/wst.2017.632.
Microalgae commonly found in waste stabilization ponds (WSPs) are able to accumulate elevated phosphorus levels within their cells in a process known as luxury uptake. However, there are few studies focused on luxury uptake in full scale WSPs. In order to comprehensively quantify the occurrence of this phenomenon, eight different WSP sites comprising seven primary facultative, six maturation and two high rate algal ponds (HRAPs) spread over several climatic regions were monitored over four seasons. Of the 15 ponds studied, 13 of these exhibited elevated levels of biomass phosphorus content at some point; however, the occurrence in HRAPs was limited. More than half of the samples tested had elevated phosphorus contents and this occurred in all climatic zones surveyed. The phosphorus content of the biomass was significantly correlated to decreasing rainfall and increasing total dissolved phosphorus. Microscopic analysis revealed that nearly all the 17 microalgal and five cyanobacterial genera identified performed luxury uptake, but at varying frequencies. This is the first time that the genera of algae responsible for luxury uptake in full scale WSPs has been studied. Chlamydomonas/Cryptomonas, Micractinium/Microcystis and Scenedesmus were the only microalgal genera found to both commonly occur in WSPs and consistently perform luxury uptake.
常见于稳定塘中的微藻能够在细胞内积累高水平的磷，这一过程被称为奢侈吸收。然而，很少有研究关注全尺寸稳定塘中的奢侈吸收现象。为了全面量化这一现象的发生情况，在四个季节里对分布在几个气候区域的八个不同的稳定塘场地进行了监测，其中包括七个一级兼性塘、六个熟化塘和两个高负荷藻塘（HRAPs）。在所研究的15个池塘中，有13个在某些时候表现出生物量磷含量升高的情况；然而，高负荷藻塘中的这种现象较为有限。超过一半的测试样本磷含量升高，且这种情况在所有调查的气候区域都有发生。生物量中的磷含量与降雨量减少和总溶解磷增加显著相关。显微镜分析表明，几乎所有鉴定出的17个微藻属和5个蓝藻属都进行了奢侈吸收，但频率各不相同。这是首次对全尺寸稳定塘中负责奢侈吸收的藻类属进行研究。衣藻属/隐藻属、微芒藻属/微囊藻属和栅藻属是仅有的既常见于稳定塘又持续进行奢侈吸收的微藻属。
