五种物料对磷的吸附—解吸能力研究

滇池流域富营养化严重,非点源磷污染对滇池水体影响较大,为防止施入农田的畜禽粪便中水溶性磷的过度流失,采用室内等温吸附的方法,探究了5种物料对磷的吸附能力及吸附后解吸能力的强弱,并分别用Langmuir方程和Freundlich方程拟合各物料的等温吸附曲线,挑选出适合的1种作为猪粪填充物料。结果表明,5种物料中粉煤灰的吸附能力最强。用Langmuir方程拟合得出:粉煤灰、锅炉灰、鸡蛋壳、氧化铝、沸石的最大吸附量(Qmax)分别是2380.95、1818.18、1694.92、1428.57、1923.08mg·kg-1。用Freundlich方程拟合得出吸附能力(K)最大的是粉煤灰。5种物料中解吸趋势较缓慢的是粉煤灰。粉煤灰是5种物料中最适合作为畜禽粪便水溶性磷的吸附填充物。

Effects of Five Materials on the Adsorption and Desorption of Phosphorus

Eutrophication is serious in Dianchi basin,with the non-point source of phosphorus as its main contributor.To prevent excessive loss of soluble phosphorus from livestock manure applied to farmland,phosphate adsorption and desorption capacity of fly coal ash,boiler ash,egg shells,aluminum oxide,and zeolite were studied using isothermal adsorption method.The results showed that fly coal ash presented the highest adsorption capacity among the five tested materials.The maximum adsorption quantities （Qmax） estimated by Langmuir equation for fly coal ash,boiler ash,egg shells,aluminum oxide,and zeolite were 2380.95 mg · kg-1,1818.18 mg · kg-1,1694.92 mg · kg-1,1428.57 mg · kg-1,and 1923.08 mg · kg-1 respectively.When reached equilibrium,soluble phosphate concentration with fly coal ash is the highest than any other.Fly coal ash should be the most suitable phosphorus adsorbent used with manure among the five materials.