摘要
通过基质磷素等温吸附实验,研究了砂子、水淬渣、钢渣3种人工湿地基质净化磷素的效果.结果表明:Freundlich和Langmuir等温吸附曲线方程均能较好地描述上述基质磷素吸附的过程,其磷素理论饱和吸附量依次为钢渣12 500 mg.kg-1,水淬渣3 333 mg.kg-1,砂子270 mg.kg-1.基质吸附饱和后,磷素解吸实验表明:水淬渣磷素解吸率最低,为0.68%;砂子的解吸率最高,为7.59%.虽然钢渣的吸附量最大,但其水溶液pH显强碱性,不适合湿地植物的生长;水淬渣作为一种工业废料,磷素吸附量为砂子的12倍左右,解吸率为砂子的1/10,而且对植物生长无明显危害,是一种比较有应用前景的湿地除磷材料.
The effects of sand, tapping slag and WGS（water granulated slag） used as adsorbents on phosphorus removal from the substrate of constructed wetland （CW） were investigated isothermally through adsorption tests, as well as their adsorbilities. The results showed that the isothermal adsorption process can be represented well by both the Freundlich and Langmuir equations. Theoretically the saturated adsorbilities for phosphorus removal of sand, tapping slag and WGS are 270, 12 500 and 3 333 mg· kg^- 1, respectively. After the substrate has been saturated through such adsorption, the results of desorption test of phosphorus showed that the desorbility of WGS is 0.68 %, i.e. the lowest, while that of sand is the highest, i.e. 7.59 %. As to the tapping slag, its adsorbility is the highest but its solution presents high pH value or high alkalinity and hence inadaptable to the growth of mire plants. As an industrial waste, WGS＇ s adsorbility is about 12 times as high as sand and its desorbility is just 1/10 of sand, especially WGS has no obvious hazard to the growth of plants. So, comparatively, WGS has good prospects for phosphorus removal from CW.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期730-733,共4页
Journal of Northeastern University(Natural Science)
基金
辽宁省教育厅青年基金资助项目(2005264)
辽宁省陆地生态过程与区域生态安全重点实验室开放基金资助项目(KF2007-02)
关键词
人工湿地
基质
磷素吸附
磷素解吸
水淬渣
constructed wetland
substrates
phosphorus adsorption
phosphorus desorption
water-granulated slag from blast-furnace
