生态环境学报 ›› 2023, Vol. 32 ›› Issue (3): 590-598.DOI: 10.16258/j.cnki.1674-5906.2023.03.016
收稿日期:
2022-11-21
出版日期:
2023-03-18
发布日期:
2023-06-02
作者简介:
张广毅(1985年生),男,副教授,博士,研究方向为水污染控制、微生物腐蚀、生物电化学。E-mail: Zhanggy@zzu.edu.cn
基金资助:
ZHANG Guangyi1(), ZHANG Jiatao1, WANG Xiaowei2
Received:
2022-11-21
Online:
2023-03-18
Published:
2023-06-02
摘要:
针对沉积物中沉积磷(P)通过微生物活动再释放,致使湖泊富营养化反复的问题,采集郑州大学眉湖上覆水和沉积物,搭建一个沉积式微生物燃料电池(Sediment Microbial Fuel Cell,SMFC)系统,研究了通过SMFC限制沉积磷向上覆水体释放的方法。实验周期内监测SMFC的电压和阳极电极电位、上覆水温度pH、沉积物磷的Standards Measurements and Testing(SMT)法分级提取;并在实验开始与结束收集阳极微生物样进行微生物群落及基因分析;首次使用氧化锆薄膜扩散梯度技术(Zr-Oxide Diffusive Gradients in Thin-films,Zr-Oxide DGT)可视化了SMFC沉积物中不稳定磷亚毫米分辨率的浓度分布。结果表明:SMFC阳极电极电位从-100 mV升至230 mV;上覆水pH从7.15升至7.46;SMFC沉积物烧失量(Loss on Ignition,LOI)从18.31%±0.7%降至13.09%±1.10%,低于对照组的14.29%±2.10%;SMFC显著促进了孔隙水磷向沉积物磷的矿化过程,在沉积物垂向方向上,NaOH-P和HCl-P出现了明显的区域性增加;根据沉积物DGT磷的二维(2D)图像,SMFC使沉积物DGT磷的浓度最低降至初始值的66%;基于京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)数据库的功能基因分析,SMFC使磷相关功能基因丰度显著增加。证明SMFC对于沉积物磷和水相磷分布有显著影响,通过基质竞争、提高阳极电位等方式减弱固相磷的溶解,促进水相磷向沉积相磷的转化,可用于富营养化水体原位底泥磷稳定化。该文深入研究了SMFC固磷作用机理,为修复水体内源磷污染提供了一种新思路。
中图分类号:
张广毅, 张嘉涛, 王晓伟. 湖泊底泥微生物燃料电池中磷形态分布及释放研究[J]. 生态环境学报, 2023, 32(3): 590-598.
ZHANG Guangyi, ZHANG Jiatao, WANG Xiaowei. Phosphorus Speciation Distribution and Release in Lake Sediment Microbial Fuel Cells[J]. Ecology and Environment, 2023, 32(3): 590-598.
图4 实验结束时SMFC(a)和对照组(b)的沉积物垂向磷分布
Figure 4 Phosphorus fractionation in the vertical sediments of SMFC (a) and the control (b) at the end of the experiments
图5 实验开始和结束时SMFC和对照组沉积物的DGT磷的二维分布
Figure 5 Two-dimensional distribution of DGT-P in SMFC and control group sediment at the beginning and end of the experiment
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