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当前位置: 首页 > 文章 > 几种粉煤灰对磷素吸附与解吸特性的研究 应用生态学报 2005,16 (9) 1756-1760
Position: Home > Articles > Phosphate adsorption and desorption characteristics of several fly ashes. Chinese Journal of Applied Ecology 2005,16 (9) 1756-1760

几种粉煤灰对磷素吸附与解吸特性的研究

作  者：
冯跃华;胡瑞芝;张杨珠;邹应斌;黄运湘;王翠红;李法云
单  位：
湖南农业大学资源环境学院;湖南农业大学农学院;辽宁大学环境与生命科学院
关键词：
粉煤灰;吸附量;吸磷率;解吸率
摘  要：
通过吸附解吸和培养试验,研究了几种粉煤灰对磷素吸附与解吸特性.结果表明,粉煤灰的全磷含量和有效磷含量分别为0.545~4.540 g.kg-1和19.55~163.0 mg.kg-1,显著高于土壤,粉煤灰对磷吸附量随着加入溶液磷浓度的增加而增加,但其吸附率随着加入溶液磷浓度的增加而减少;粉煤灰的吸磷率比土壤高,但其解吸率低.这主要是由于粉煤灰比土壤存在更多的磷吸附位点且结合能大,不易解吸.Langmuir方程、Freundlich方程和Temkin方程都能很好地拟合粉煤灰对磷吸附,其中Langmuir方程的MBC、Freundlich方程的a和Temkin方程的k2都可以表征粉煤灰对磷吸附能力,MBC、a和k2值越大,则吸磷能力越强.不同来源的粉煤灰的MBC、a和k2值不同,其大小顺序为:湘潭电厂(5 167.7,4 056.2,831.5)>岳阳纸厂(1 650.7,2 803.4,711.9)>华能电厂(303.0,1 677.6,368.7)>株洲电厂(76.2,464.2,211.0)>洞庭氮肥厂(34.7,413.48,213.8).粉煤灰对磷吸附固定作用随粉煤灰含水量的增加有增大的趋势.粉煤灰对磷吸附主要是专性吸附和化学沉淀反应,所以在施用粉煤灰改良土壤或利用粉煤灰制造复混肥时,须考虑粉煤灰对磷的固定作用及粉煤灰含水量的影响.
译  名：
Phosphate adsorption and desorption characteristics of several fly ashes.
作  者：
FENG Yuehua~(1,2),HU Ruizhi~1,ZHANG Yangzhu~1,ZOU Yingbin~2,HUANG Yunxiang~1,WANG Cuihong~1,LI Fayun~3 (()~1College of Resource and Environment Science,Hunan Agricultural University,Changsha 410128,China;()~2College of Agronomy,Hunan Agricultural University,Changsha 410128,China;()~3College of Environment and Life Science,Liaoning University,Shenyang 110036,China)
关键词：
Fly ash, Adsorption capacity, P adsorption rate, P desorption rate.
摘  要：
Through adsorption-desorption experiment and incubation test,this paper studied the phosphate adsorption and desorption characteristics of several fly ashes.The test fly ashes contained 0.545～4.540 g·kg~(-1) of total P and 19.55～163.0 mg·kg~(-1) of available P,which were significantly higher than those in soils.The P adsorption capacity of fly ashes increased with increasing added P,while their P adsorption rate was in adverse.Fly ashes had a higher P adsorption rate but a lower P desorption rate than soils,mainly because fly ashes had more P adsorption sites and stronger bound energy.In this study,Langmuir,Freundlich,and Temkin equations were fit to the measured data,and the MBC value in Langmuir equation,a value in Freundlich equation,and k_2 value in Temkin equation could be used as a comprehensive index to characterize the potential phosphate adsorptivity of fly ashes.The larger these values were,the stronger the P adsorptivity was.The MBC,a and k_2 value of 5 fly ashes collected from different locations was in order of Xiangtan power factory (5 167.7,4 056.2 and 831.5) >Yueyang paper factory (1 650.7,2 803.4 and 711.9)>Huaneng power factory (303.0,1 677.6 and 368.7)>Zhuzhou power factory (34.7,413.48 and 213.8)>Dongting nitrogen fertilizer factory (34.7,413.48 and 213.8).The P fixation by fly ashes generally increased with their increasing water content,and their phosphate adsorption was mainly specific adsorption and chemical precipitation,suggesting that the P fixation and the water content of fly ashes should be considered when fly ash was used as soil amendment or as compound fertilizer filling substance.

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