The sediment–water interface is not only an important location for substrate conversion in a mariculture system, but also a major source of eutrophication. This study aimed to clarify the characteristics of inorganic nitrogen (ammonia, nitrite and nitrate) removal by Marichromatium gracile YL28 in the presence of both organic nitrogen and inorganic nitrogen. The results showed that, in the presence of peptone or urea, seaweed oligosaccharides (SOS) effectively enhanced the ammonia removal capacity of YL28 (6.42 mmol/L) and decreased the residual rate by 54.04% or 8.17%, respectively. With increasing peptone or urea concentrations, the removal of both ammonia and nitrate was gradually inhibited, and the residual rates of ammonia and nitrate reached 22.56–34.36% and 12.03–15.64% in the peptone system and 20.65–24.03% and 12.20–13.21% in the urea system, respectively. However, in the control group the residual rates of ammonia and nitrate reached 11.97% and 5.12%, respectively. In addition, the concentrations of peptone and urea did not affect nitrite removal, and YL28 displayed better cell growth and nitrogen removal activity in the presence of bait and SOS. Overall, the ability of YL28 to remove inorganic nitrogen was enhanced in the presence of organic nitrogen.

沉积物-水界面不仅是海水养殖系统中底物转化的重要场所，还是富营养化的主要来源。这项研究的目的是阐明用微球藻染色去除无机氮（氨，亚硝酸盐和硝酸盐）的特征。在有机氮和无机氮共同存在下的YL28。结果表明，在蛋白ept或尿素存在下，海藻寡糖（SOS）可以有效提高YL28的脱氨能力（6.42 mmol / L），并使残留率分别降低54.04％或8.17％。随着蛋白or或尿素浓度的增加，氨和硝酸盐的去除逐渐受到抑制，蛋白system系统中氨和硝酸盐的残留率分别达到22.56–34.36％和12.03–15.64％，以及20.65–24.03％和12.20–13.21％在尿素系统中。然而，在对照组中，氨和硝酸盐的残留率分别达到了11.97％和5.12％。此外，蛋白ept和尿素的浓度不会影响亚硝酸盐的去除，在诱饵和SOS存在下，YL28和YL28表现出更好的细胞生长和脱氮活性。总体而言，在有机氮存在下，YL28去除无机氮的能力得到增强。