摘要
生物炭常被用来制作沉积物原位覆盖材料,以减少沉积物内源污染的释放。研究模拟了白洋淀清淤后铺洒生物炭以及活性炭对上覆水的降浊效果,共在白洋淀中设立6个围隔(搅动空白;铺洒空白;生物炭薄;生物炭厚;活性炭薄;活性炭厚),通过人力搅动的形式模拟清淤过程,搅动结束后迅速铺洒不同厚度的活性炭与生物炭并于0 min、1 min、2 min、5 min、10 min、20 min、60 min、120 min、540 min后测定围隔内表层、中层以及底层的悬浮颗粒物质量浓度。结果表明:生物炭投加后在第2分钟达到极大值,而活性炭投加后第1分钟即达到极值。无论生物炭或者活性炭,短期内(120 min)都没有降浊效果,反而是悬浮颗粒物的污染源。但在540 min时,与搅动空白对比,仅活性炭有一定的降浊效果。投加活性炭的水体浊度下降趋势优于投加生物炭的水体。无论生物炭还是活性炭,铺加层越厚,水体越浑浊。研究结果对清淤后生物炭原位覆盖过程的降浊效果与风险具有借鉴意义。
Biochar is often used to make in-situ sediment covering materials to reduce the release of internal pollution source.This study simulated the effect of biochar and activated carbon on reducing the turbidity of the overlying water in Baiyangdian Lake after desilting,by spreading different thickness of biochar and activated carbon soon after stirring with manpower the 6 enclosures(blank stirring,blank spreading,thin biochar,thick biochar,thin activated carbon,thick activated carbon)set up in the lake,and then measuring the mass concentration of suspended particulate matters in the inner surface layer,middle layer and bottom layer of the enclosures after 0 min,1 min,2 min,5 min,10 min,20 min,60 min,120 min,and 540 min.The results showed that the activity of biochar reached the maximum after 2 minutes,while the activity of activated carbon peaked in 1 minute.Both of the biochar and activated carbon failed to work in a short time period(120 min),but became the pollution source of suspended particulate matter.Compared with the stirring blank at 540 min,however,only activated carbon had a certain turbidity-reducing effect.The decrease trend of turbidity of water with activated carbon was better than that with biochar.The thicker the biochar or activated carbon was,the greater the turbidity became.This paper is of reference value to the turbidity-reducing effect and risk of biochar during in-situ covering process after desilting.
作者
刘冬
尹然
单相斐
Liu Dong;Yin Ran;Shan Xiangfei(Zhongke Qianhe Environmental Protection and Technology Service Co.,Ltd.,Beijing 100083,China;High School Attached to Tsinghua University,Beijing 100085,China)
出处
《甘肃科学学报》
2020年第3期66-71,共6页
Journal of Gansu Sciences
关键词
生物炭
白洋淀
清淤
降浊
悬浮颗粒物
Biochar
Baiyangdian Lake
Desilting
Turbidity-reducing
Suspended particulate matter
