National Institute of Water and Atmospheric Research Ltd. (NIWA), Hamilton, New Zealand; School of Science, University of Waikato, New Zealand.
School of Science, University of Waikato, New Zealand; Environmental Research Institute, University of Waikato, New Zealand.
J Environ Manage. 2023 Jan 15;326(Pt A):116705. doi: 10.1016/j.jenvman.2022.116705. Epub 2022 Nov 12.
Filamentous algae nutrient scrubber (FANS) operating parameters can strongly influence algal biomass productivity and nutrient removal. However, few studies to date have investigated the effects of FANS operating parameters such as initial standing crop, harvesting frequency and influent flow rate on biomass productivity and nutrient removal performance, especially for FANS that cultivate a single species of algae. Therefore, the overall aim of this study was to investigate how operating parameters affect the biomass productivity and nutrient removal performance of Oedogonium sp. - a promising species for unialgal FANS. The initial standing crop had a significant effect on biomass productivity, with productivities being highest (8.6 ± 0.5 g DW biomass mday) when the initial standing crop was 60-70 g DW m. However, the daily nutrient removal rate was highest (0.47 ± 0.06 g N m dayand 1.24 ± 0.13 g P m day) at the highest initial standing crop (100-110 DW m). Biomass productivity was highest with a three-day growth period, regardless of size of the initial standing crop. Therefore, a four-day harvesting interval was selected as the optimal harvesting regime to promote exponential growth and high biomass production. Influent flow rate had a significant effect on biomass productivity, which was highest (9.3 ± 1.7 g DW m day) for the 1 L min flow rate. This flow rate also gave the highest instantaneous nutrient removal rate (0.05 ± 0.02 g N m and 0.14 ± 0.05 g P m). Current results suggest that an optimum initial standing crop of 70-80 g DW m, harvesting frequency of four days and influent flow rate of 1 L min (16.7 L min m width) were optimal for Oedogonium sp. cultivated on FANS to maximize their biomass production and nutrient removal under controlled laboratory conditions. These results contribute to understanding the impacts of operating parameters on optimizing unialgal Oedogonium sp. FANS biomass production and nutrient removal performance.
丝状藻类营养洗涤器（FANS）的操作参数会强烈影响藻类生物质生产力和养分去除效率。然而，迄今为止，很少有研究调查 FANS 操作参数（如初始存量、收获频率和进水流量）对生物质生产力和养分去除性能的影响，特别是对于培养单一藻类物种的 FANS。因此，本研究的总体目标是调查操作参数如何影响 Oedogonium sp. 的生物质生产力和养分去除性能，Oedogonium sp. 是 FANS 培养的一种很有前途的单一藻类物种。初始存量对生物质生产力有显著影响，当初始存量为 60-70 g DW m 时，生产力最高（8.6±0.5 g DW 生物质 mday）。然而，在最高初始存量（100-110 DW m）时，日养分去除率最高（0.47±0.06 g N m day 和 1.24±0.13 g P m day）。无论初始存量大小，三天的生长周期都会使生物质生产力达到最高。因此，选择四天的收获间隔作为最佳收获方案，以促进指数生长和高生物质生产。进水流量对生物质生产力有显著影响，在 1 L min 的流量下，生产力最高（9.3±1.7 g DW m day）。该流量还产生了最高的瞬时养分去除率（0.05±0.02 g N m 和 0.14±0.05 g P m）。目前的结果表明，在控制实验室条件下，对于在 FANS 上培养的 Oedogonium sp.，最佳初始存量为 70-80 g DW m、四天的收获频率和 1 L min 的进水流量（16.7 L min m 宽度），以最大限度地提高其生物质生产和养分去除效率。这些结果有助于了解操作参数对优化单一藻类 Oedogonium sp. FANS 生物质生产和养分去除性能的影响。
