National Institute of Water and Atmospheric Research Ltd. (NIWA), PO Box 8602, Christchurch, New Zealand; School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.
School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.
Water Res. 2014 Dec 1;66:53-62. doi: 10.1016/j.watres.2014.08.010. Epub 2014 Aug 21.
When wastewater treatment high rate algal ponds (HRAP) are coupled with resource recovery processes, such as biofuel production, short hydraulic retention times (HRTs) are often favoured to increase the microalgal biomass productivity. However, short HRT can result in increased nutrient load to the HRAP which may negatively impact on the performance of the microalgae. This paper investigate the effects of high (NH4-N mean concentration 39.7 ± 17.9 g m(-3)) and moderate ((NH4-N mean concentration 19.9 ± 8.9 g m(-3)) nutrient loads and short HRT on the performance of microalgae with respect to light absorption, photosynthesis, biomass production and nutrient removal in pilot-scale (total volume 8 m(3)) wastewater treatment HRAPs. Microalgal biomass productivity was significantly higher under high nutrient loads, with a 133% and 126% increase in the chlorophyll-a and VSS areal productivities, respectively. Microalgae were more efficient at assimilating NH4-N from the wastewater under higher nutrient loads compared to moderate loads. Higher microalgal biomass with increased nutrient load resulted in increased light attenuation in the HRAP and lower light absorption efficiency by the microalgae. High nutrient loads also resulted in improved photosynthetic performance with significantly higher maximum rates of electron transport, oxygen production and quantum yield. This experiment demonstrated that microalgal productivity and nutrient removal efficiency were not inhibited by high nutrient loads, however, higher loads resulted in lower water quality in effluent discharge.
当废水处理高效藻类塘（HRAP）与资源回收过程（如生物燃料生产）相结合时，通常会选择较短的水力停留时间（HRT）来提高微藻生物质生产力。然而，较短的 HRT 会导致 HRAP 中养分负荷增加，从而可能对微藻的性能产生负面影响。本文研究了高（NH4-N 平均浓度 39.7±17.9 g m(-3)) 和中等（NH4-N 平均浓度 19.9±8.9 g m(-3)) 养分负荷以及短 HRT 对微藻在光吸收、光合作用、生物量生产和营养物质去除方面性能的影响，研究在中试规模（总容积 8 m(3)) 废水处理 HRAP 中进行。在高养分负荷下，微藻生物质生产力显著提高，叶绿素-a 和 VSS 比生产率分别提高了 133%和 126%。与中等负荷相比，微藻在高养分负荷下更有效地从废水中同化 NH4-N。较高的微藻生物量会导致 HRAP 中的光衰减增加，以及微藻的光吸收效率降低。高养分负荷还导致光合作用性能得到改善，电子传递、氧气产生和量子产率的最大速率显著提高。本实验表明，高养分负荷并没有抑制微藻的生产力和养分去除效率，但较高的负荷会导致出水水质下降。
