缓释氧复合材料不同投加方式对沉积物-水界面污染物迁移的影响

郭鹏飞; 董子义; 王颖; 付军; 王京刚; 刘娴静

doi:10.13205/j.hjgc.202105001

缓释氧复合材料不同投加方式对沉积物-水界面污染物迁移的影响

doi: 10.13205/j.hjgc.202105001

1. 北京化工大学化学工程学院, 北京 100029;
2. 北京师范大学环境学院, 北京 100048;
3. 中日友好环境保护中心, 北京 100029

基金项目:

国家水体污染控制与治理科技重大专项（2018ZX07110004）。

详细信息

作者简介:
郭鹏飞(1996-),男,硕士研究生,主要研究方向为水污染控制工程。15561109362@163.com

通讯作者:
王颖(1978-),女,副教授,主要研究方向为水污染控制与水质净化新技术。yingwang@bnu.edu.cn

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出版历程
- 收稿日期: 2020-07-24
- 网络出版日期: 2022-01-17

EFFECTS OF DIFFERENT DOSING METHODS OF SLOW-RELEASE OXYGEN COMPOSITE MATERIALS ON THE MIGRATION OF POLLUTANTS AT THE SEDIMENT-WATER INTERFACE

1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. College of Environment, Beijing Normal University, Beijing 100048, China;
3. Sino-Japan Friendship Centre for Environmental Protection, Beijing 100029, China

摘要

摘要: 为改善湖泊沉积物-水界面生境，开发了一种可原位供氧同时削减内源氮释放的缓释氧材料。发现以m（CaO₂）：m（白土）：m（水泥）=2：1：1制备的缓释氧材料具有较好的释氧和pH缓冲能力。通过模拟实验比较缓释氧材料不同投加方式（表层投加和泥内投加）对释氧和沉积物中污染物释放的影响。结果表明：1）表层投加缓释氧材料使得上覆水中DO浓度和pH值明显升高，而在泥内投加可以使pH值维持在7.5以内，同时DO浓度缓慢增加，延长了释氧周期；2）缓释氧材料对沉积物中NH₄⁺-N释放有显著的抑制作用，且表层投加方式明显高于泥内投加，以空白组作参比，静态培养31 d后，泥内加入缓释氧材料对NH₄⁺-N的抑制率为53.4%，而表层投加对NH₄⁺-N的抑制率达到81.1%，投加释氧材料有利于提高上覆水DO水平，促进硝化细菌的生长，从而抑制NH₄⁺-N的释放；3）缓释氧材料有利于微生物生长，促进了微生物腐殖化作用，从而对沉积物中类陆源腐植酸的释放略有促进，而对类酪氨酸蛋白释放略有抑制；4）缓释氧材料可促进沉积物中Fe/Al-P向Ca-P转化，对DIP的释放略有抑制，但由于pH增加导致沉积物中DOC以及重金属As和Cr的释放略有增加。
- 缓释氧材料 /
- 氧剖面 /
- 氮磷释放 /
- DOM /
- 重金属 /
- 分级磷
Abstract: In order to improve the lake sediment-water interface habitat, a slow-release oxygen material that can supply oxygen in situ and reduce the release of endogenous nitrogen was developed. The slow-release oxygen material prepared with CaO₂:white clay:cement=2:1:1 (mass ratio) had good oxygen release and pH buffering capability. The simulation experiment compared the effects of different dosing methods of slow-release oxygen materials (surface dosing and in-mud dosing) on the release of oxygen and the release of pollutants in the sediments. The results showed that:1) the DO concentration and pH value of the overlying water were significantly increased by surface dosing, and in-mud dosing could maintain the pH value within 7.5, while the DO concentration increased slowly, prolonging the oxygen release period; 2) slow-release oxygen materials had a significant inhibitory effect on release of NH₄⁺-N in the sediment, and surface dosing was significantly effective than in-mud dosing. Taking the blank group as the reference, after 31 days of static culture, the inhibition rate of NH₄⁺-N by adding slow-release oxygen material into the mud was 53.4%, and that of the surface dosing was 81.1%. Adding oxygen-releasing materials increased the level of DO in the overlying water and promoted the growth of nitrifying bacteria, thereby inhibiting the release of NH₄⁺-N; 3) slow-release oxygen materials were beneficial to microorganisms growth which promoted the humification of microorganisms, thereby slightly promoted the release of terrestrial-like humic acids in the sediments, while slightly inhibited the release of tyrosine-like proteins; 4) slow-release oxygen materials could promote the conversion of Fe/Al-P to Ca-P in the sediment which slightly inhibited the release of DIP, but the release of DOC and arsenic and chromium in the sediment increased slightly, due to the increase of pH.
- oxygen release material /
- oxygen profile /
- nitrogen and phosphorus release /
- DOM /
- heavy metals /
- graded phosphorus

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