Microbial-algal symbiotic system drives reconstruction of nitrogen, phosphorus, and methane cycles for purification of pollutants in aquaculture water

文献类型： 外文期刊

第一作者： Gao, Jun

作者： Gao, Jun;Mang, Qi;Li, Quanjie;Sun, Yi;Xu, Gangchun;Mang, Qi

作者机构：

关键词： Bacillus subtilis; Chlorella pyrenoidosa; Cross feeding; Environmental microorganisms; Element cycles

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.0； 五年影响因子：9.5 ）

ISSN： 0960-8524

年卷期： 2025 年 430 卷

页码：

收录情况： SCI

摘要： Intensive aquaculture's excessive nitrogen, phosphorus, and methane emissions caused environmental degradation. This study explored how algae-bacteria symbiotic systems (ABSS) enhanced water purification by regulating element cycles. We established a Chlorella pyrenoidosa-Bacillus subtilis symbiotic system. At a 1:1 bacteria-to-algae ratio, chlorophyll a and cell dry weight were highest. C. pyrenoidosa supplied organic acids, carbohydrates, and amino acids to B. subtilis, which reciprocated with amino acids, purines, and vitamins. ABSS significantly reduced total nitrogen, ammonia nitrogen (NH4+-N), nitrite (NO2--N), nitrate (NO3--N), phosphate (PO43--P), total phosphorous, dissolved organic carbon, and chemical oxygen demand in aquaculture water. It reshaped microbial communities and enriched key genus (Limnohabitans, Planktophila, Polaromonas, Methylocystis) and upregulating genes linked to organic phosphate mineralization, methane oxidation, and nitrate reduction. These changes strengthened nitrogen-phosphorus-methane cycle coupling, boosting water purification. ABSS offers an eco-engineering solution for aquaculture pollution by optimizing microbial interactions and nutrient cycling.

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