生物炭强化黄铁矿基质生物滞留设施径流脱氮效能研究
Study on runoff nitrogen removal efficiency of biochar amended pyrite substrate bioretention facility
罗梵霄 1马海元 1黄璁 2曲丹 3许峥 2秦然 1柴宏祥1
作者信息
- 1. 重庆大学三峡库区生态环境教育部重点实验室,重庆 400045
- 2. 中国电建集团华东勘测设计研究院有限公司,杭州 311122
- 3. 北京林业大学环境科学与工程学院水体污染源控制技术北京市重点实验室,北京 100083
- 折叠
摘要
黄铁矿生物滞留设施作为具有同步脱氮除磷功能的新兴雨水净化措施,具有广泛的应用前景.针对黄铁矿生物滞留系统在径流高氮负荷条件下脱氮性能较低的问题,开发了一种基于生物炭改良的黄铁矿生物滞留系统,研究了通过生物炭改良的黄铁矿硫自养反硝化的生物滞留系统对模拟雨水径流的脱氮效能及COD、TP去除情况并对系统中反应后黄铁矿的表面通过SEM进行表征.结果表明,生物炭黄铁矿混合基质生物滞留系统可实现更为高效的反硝化脱氮,对NO3--N和TN的平均去除率分别可达64.2％和68.1％,相比于黄铁矿生物滞留系统提升了 76.15％和45.44％.该系统对COD需求低,通过利用生物炭的电子穿梭与蓄电池机制,在面对低C/N比径流时仍然能够有效地进行反硝化.同时通过生物炭的保水性能够有效地降低黄铁矿的氧化程度,从而提升生物滞留设施的寿命.
Abstract
Pyrite bioretention systems,as an emerging stormwater treatment facility with sim-ultaneous nitrogen and phosphorus removal,have a wide range of potential applications.To ad-dress the problem of low nitrogen removal performance of pyrite bioretention systems under high nitrogen loading of runoff,a biochar-modified pyrite bioretention system was developed,and the nitrogen removal performance of the biochar-modified bioretention system with autotrophic denitri-fication of pyrite on simulated stormwater runoff,as well as the removal of COD and TP,was in-vestigated,and the surface of the reacted pyrite in the system was characterized by SEM.The re-sults showed that the bioretention system with mixed substrate of biochar and pyrite could achieve more efficient denitrification and nitrogen removal,with an average removal rate of 71.2％for NOx--N and 75.6％for TN,and the system had low COD demand and was able to carry out deni-trification efficiently when faced with a low C/N ratio of rainfall by the electron shuttling and stor-age battery mechanism of biochar.At the same time,the water-holding capacity of biochar can ef-fectively reduce the degree of oxidation of pyrite,thereby extending the life of the bioretention sys-tem.
关键词
生物滞留系统/雨水径流/黄铁矿/生物炭/自养反硝化Key words
Bioretention systems/Stormwater runoff/Pyrite/Biochar/Autotrophic denitrifica-tion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据