Abstract：
Algae-mediated nitrogen removal from low carbon vs. nitrogen (C/N) wastewater techniques has garnered significant attention due to its superior autotrophic assimilation properties. This study investigated the ammonium-N removal potential of four algae species from low C/N synthetic wastewater. Results showed that 95 % and 99 % of ammonium-N are eliminated at initial concentrations of 11.05 ± 0.98 mg/L and 42.51 ± 2.20 mg/L with little nitrate and nitrite accumulation. The compositions of secreted algal-derived dissolved organic matter varied as C/N decreased and showed better bioavailability for nitrate-N removal by Pseudomonas sp. SZF15 without pre-oxidation, achieving an efficiency of 99 %. High-throughput sequencing revealed that the aquatic microbial communities, dominated by Scenedesmus, Kalenjinia, and Micractinium, remain relatively stable across different C/N, aligning with the underlying metabolic pathways. These findings may provide valuable insights into the sustainable elimination of multiple nitrogen contaminants from low C/N wastewater.
摘要：
藻类介导的低碳脱氮与氮（C/N）废水技术由于其优越的自养同化性能而受到广泛关注。本研究调查了四种藻类从低C/N合成废水中去除氨氮的潜力。结果表明，在初始浓度为11.05±0.98mg/L和42.51±2.20mg/L时，95％和99％的铵N被消除，硝酸盐和亚硝酸盐的积累很少。分泌的藻类衍生的溶解有机物的组成随C/N的降低而变化，并显示出假单胞菌去除硝酸盐氮的更好的生物利用度。没有预氧化的SZF15，达到99%的效率。高通量测序揭示了水生微生物群落,以Scenedesmus为主，Kalenjinia,还有钆,在不同的C/N下保持相对稳定，与潜在的代谢途径保持一致。这些发现可能为可持续消除低C/N废水中的多种氮污染物提供有价值的见解。
