CAJ | 학술논문

采用等温吸附、吸附动力学、填料饱和吸附后磷素释放实验,研究了紫色土、河沙、页岩、石灰岩对磷的吸附特征,结果表明Langmuir和Freundlich等温吸附方程均能很好地拟合各填料对磷的吸附特征,各填料对磷的最大吸附量大小顺序依次为石灰岩(666.67 mg/kg)＞河沙(500.00 mg/kg)＞页岩(434.78 mg/kg)＞紫色土(416.67 mg/kg);从反应速率来看,吸附过程都可分为快、中、慢3个阶段;柑对一级动力学方程、双常数方程而言,Elovich方程对4种填料的吸附动力学特征拟合最好,决定系数R~2在0.831～0.966之间;从磷的解吸率来看,各填料释磷大小顺序依次为河沙(4.257%)＞页岩(3.803%)＞石灰岩(3.638%)＞紫色土(2.134%).综合考察得出,石灰岩更适合作为人工湿地污水除磷的填料.
채용등온흡부、흡부동역학、전료포화흡부후린소석방실험,연구료자색토、하사、혈암、석회암대린적흡부특정,결과표명Langmuir화Freundlich등온흡부방정균능흔호지의합각전료대린적흡부특정,각전료대린적최대흡부량대소순서의차위석회암(666.67 mg/kg)＞하사(500.00 mg/kg)＞혈암(434.78 mg/kg)＞자색토(416.67 mg/kg);종반응속솔래간,흡부과정도가분위쾌、중、만3개계단;감대일급동역학방정、쌍상수방정이언,Elovich방정대4충전료적흡부동역학특정의합최호,결정계수R~2재0.831～0.966지간;종린적해흡솔래간,각전료석린대소순서의차위하사(4.257%)＞혈암(3.803%)＞석회암(3.638%)＞자색토(2.134%).종합고찰득출,석회암경괄합작위인공습지오수제린적전료.
The phosphorus adsorption characteristics of four substrates (purples soil, river sands, shale, limestone) in constructed wetland were studied by isothermal adsorption experiment, adsorption kinetics experiment , saturated substrates phosphorus desorption experiment. The results showed that the behaviors of phosphorus adsorption to substrates can well be fitted to both Langmuir and Freundlich isothermal adsorption equations. The phosphorus adsorption capacity of four substrates followed that limestone (666.67 mg/kg) > river sands (500.00 mg/kg) > shale (434.78 mg/kg) > purples soil (416.67 mg/kg). For the rate of absorption, the process of adsorption could be divided into fast, middle and slow stages. Elovich equations could be accurately fitted for describing absorption characteristic of four substrates ( R~2 = 0.831～0. 966 ) . The rate of saturated substrates phosphorus desorption followed that river sands (4.257% ) > shale (3.803% ) > limestone (3.638% ) > purples soil (2.134% ). The combined investigation of four substrates showed that limestone was a better constructed wetland substrate.