Effect of nitrogen to phosphorus ratio on the treatment of eutrophic water body by Hydrocotyle vulgaris L. floating bed

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jul.2023, Vol.46 No.7: 978-985

DOI: 10.3969/j.issn.1003-5060.2023.07.018

Authors

LIU Xin $ ^{1} $, HU Shuheng $ ^{1} $, ZHANG Zerui $ ^{2} $, XIE Xiaoyun $ ^{1} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: This paper selected Hydrocotyle vulgaris L. as the floating bed plants and the eutrophic water body as treatment subject to explore the impact of different nitrogen to phosphorus ratios on plant growth and pollution index purifying effect in the water body. The experiments showed that when the nitrogen to phosphorus ratio was 15.96, the Hydrocotyle vulgaris L. grew most luxuriantly, gained 45% of weight, had lower Chl-a concentration and slightly decreased conductivity, and had better nitrogen removal ability in $ NH_{4}^{+}-N $, $ NO_{2}^{-}-N $ and $ NO_{3}^{-}-N $ state. The total phosphorus (TP) concentration decreased faster at the nitrogen to phosphorus ratios of 15.96 and 24.17, the degradation rates were 96.45% and 97.88%, respectively, and the degradation of total organic carbon (TOC) in the Hydrocotyle vulgaris L. plant group was basically higher than that in the control group. High-throughput sequencing showed that the samples with the nitrogen to phosphorus ratios of 15.96 and 24.17 were enriched in common microbial genera Novosphingobium, Mucilaginibacter, Simplicispira, Sideroxydans and Limnobacter, with higher relative abundance and similarity, showing that the nitrogen to phosphorus ratio influenced the abundance of the dominant genera.

Keywords: Hydrocotyle vulgaris L. floating bed; eutrophication; nitrogen to phosphorus ratio; wastewater treatment; microbial flora

作者信息

刘鑫 $ ^{1} $，胡淑恒 $ ^{1} $，张择瑞 $ ^{2} $，谢霄云 $ ^{1} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 合肥工业大学机械工程学院，安徽合肥 230009)

摘要和关键词

摘要: 文章选取铜钱草为浮床植物, 以富营养化水体为处理对象, 探究不同氮磷比对植物生长情况和水体中各污染指标净化效果的影响。试验结果表明: 氮磷比为 15.96 时, 铜钱草生长最茂盛, 质量增加 45%, 叶绿素 a 质量浓度较低, 电导率略有下降, 对 $ NH_{4}^{+}-N, NO_{2}^{-}-N $ 和 $ NO_{3}^{-}-N $ 状态下氮的去除能力较强; 氮磷比分别为 15.96、24.17 时总磷 (total phosphorus, TP) 质量浓度下降速率较快, 降解率分别为 96.45%、97.88%, 且铜钱草植物组总有机碳 (total organic carbon, TOC) 降解情况基本均高于对照组。高通量测序结果表明, 氮磷比为 15.96、24.17 的样本富集共同微生物菌属 Novosphingobium、Mucilaginibacter、Simplicispira、Sideroxydans 和 Limnobacter, 其相对丰度较高, 相似性较强, 说明氮磷比影响优势菌属的菌群丰度。

关键词: 铜钱草浮床；富营养化；氮磷比；污水治理；微生物菌群

Funding

国家水体污染控制与治理科技重大专项资助项目（2012ZX07103-004）

合肥工业大学学报(自然科学版)

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