School of Engineering and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand; Department of Chemical Engineering and Environmental Technology, Valladolid University, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
Department of Chemical Engineering and Environmental Technology, Valladolid University, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
Bioresour Technol. 2015 Feb;177:110-7. doi: 10.1016/j.biortech.2014.10.134. Epub 2014 Nov 18.
This study investigated the generation of N2O by microcosms withdrawn from 7-L high rate algal ponds (HRAPs) inoculated with Chlorella vulgaris and treating synthetic wastewater. Although HRAPs microcosms demonstrated the ability to generate algal-mediated N2O when nitrite was externally supplied under darkness in batch assays, negligible N2O emissions rates were consistently recorded in the absence of nitrite during 3.5-month monitoring under 'normal' operation. Thereafter, HRAP A and HRAP B were overloaded with nitrate and ammonium, respectively, in an attempt to stimulate N2O emissions via nitrite in situ accumulation. Significant N2O production (up to 5685±363 nmol N2O/g TSS h) was only recorded from HRAP B microcosms externally supplied with nitrite in darkness. Although confirmation under full-scale outdoors conditions is needed, this study provides the first evidence that the ability of microalgae to synthesize N2O does not affect the environmental performance of wastewater treatment in HRAPs.
本研究调查了从接种普通小球藻并处理合成废水的 7-L 高效藻塘（HRAP）中提取的微宇宙中 N2O 的生成情况。尽管 HRAP 微宇宙在黑暗条件下外源提供亚硝酸盐的批式实验中表现出生成藻类介导的 N2O 的能力，但在 3.5 个月的“正常”运行监测期间，在没有亚硝酸盐的情况下，始终记录到可忽略不计的 N2O 排放速率。此后，分别对 HRAP A 和 HRAP B 进行硝酸盐和铵盐超负荷处理，试图通过原位积累亚硝酸盐刺激 N2O 排放。仅从黑暗中外源提供亚硝酸盐的 HRAP B 微宇宙中记录到显著的 N2O 生成（高达 5685±363 nmol N2O/g TSS h）。尽管需要在全规模户外条件下进行验证，但本研究首次提供了证据，证明微藻合成 N2O 的能力不会影响 HRAP 中废水处理的环境性能。
