农业现代化研究2017，Vol.38Issue(3)：544-552,9.DOI:10.13872/j.1000-0275.2017.0037
吸附质共存与浓度变化对植物基质N、P吸附的影响
Effects of adsorbate concentration and coexisting on adsorption of nitrogen and phosphorus by plant substrates
摘要
Abstract
The objective of this study was to identify the purifying effect and adsorption characteristics of porous plant substrates on high nitrogen and phosphorus in water. For this purpose, the adsorption process and characteristic of nitrogen and phosphorus plant substrates, including freshEichhornia crassipes (ECF) and dry(ECD), dry straw(OSD) and the dry sawdust ofCunninghamia lanceolata(CLD), were determined by static adsorption experiment. The effects of initial concentration of nitrogen and phosphorus and coexisting ions on adsorption process and characteristic were also explored. The single adsorbate experiment indicated that the removal efficiency of PO4--P decreased with the rising of initial PO4--P concentration. Besides, the removal efficiency of NO3--N and NH4+-N decreased first and then increased with the rising of initial concentration. In addition, the removal efficiency of nitrogen and phosphorus which was adsorbed by plant substrates decreased with time, and the removal was lower than 10% at 4th h and 5th h. The substrates adsorption capacity of NO3--N increased to 8.0-33.0 times with the concentration increasing from 0.01 to 0.12 mol/L, and the adsorption capacity of NH4+-N increased to 4.8-6.8 times. The average removal efficiencies of ECF were higher than that of OSD by 47.5%, 46.9%, 22.8% , and higher than that of CLD by 98.2%, 76.9%, 161.4%, respectively, for PO4--P, NO3--N, NH4+-N. Coexisting ions significantly prohibited nitrogen and phosphorus adsorption by plant substrates, whereas the NH4+-N sorption by CLD increased with PO4--P and NO3--N coexisted. The adsorption capacity of fresh water hyacinth was the highest. The maximum adsorption capacities of PO4--P, NO3--N, NH4+-N were 9.7, 66.3,and 47.9 mg/g, which were 1.8, 1.5, and 1.9 times higher than that of straw. Compared to the maximum adsorption capacities of fresh water hyacinth, the dry one decreased by 51%-60%.关键词
吸附质共存/浓度梯度/水葫芦/稻草/杉木屑/氮磷吸附Key words
adsorbent coexistence/concentration gradient/water hyacinth/rice straw/dry sawdust of Cunninghamia lanceolate/nitrogen and phosphorus adsorption分类
资源环境引用本文复制引用
田雪,王一佩,杨钙仁,彭晚霞,谭凤森,覃志伟..吸附质共存与浓度变化对植物基质N、P吸附的影响[J].农业现代化研究,2017,38(3):544-552,9.基金项目
国家自然科学基金项目(31360134) （31360134）
广西科学研究与技术开发计划(桂科转1599001-6).National Natural Science Foundation of China (31360134) （桂科转1599001-6）
The Plan of Scientific Research and Technology Development Program of Guangxi (Guike Turn 1599001-6). （Guike Turn 1599001-6）
