摘要
为探讨膨胀蛭石同步脱铵除磷能力，采用静态吸附实验考察了氨氮和磷酸盐共存时接触时间、粒径、pH值以及温度对膨胀蛭石去除氮磷效果的影响。结果表明，膨胀蛭石具有较好的同步脱铵除磷性能，在pH值为7，温度为25℃条件下，用1．00g粒径为80-100目膨胀蛭石对100mL氨氮和磷酸盐浓度分别为50mg／L和10mg／L的模拟污水处理4h后，氨氮和磷酸盐去除率分别达79．4%和93．0％，两者吸附过程均明显表现为“快速吸附，减速平衡”二阶段特征。中性条件下氨氮去除效果最好，酸性或碱性条件有利于磷酸盐去除，温度升高，氨氮去除率下降，磷酸盐去除率上升。等温吸附实验研究表明，膨胀蛭石对氨氮与磷酸盐的等温吸附线均较好的符合Langmuir方程。
Influence of contact time, particle size, pH and temperature on removal of ammonium and phosphate with expanded vermiculite were studied by static adsorption method to assess its capacity of simultaneous removal of ammonium and phosphate under the condition of ammonium and phosphate coexisting. Results showed that expanded vermiculite has a good capacity of simultaneous removal of ammonium and phosphate. Under the conditions of pH 7, temperature 25℃, 1.00g sorbent particles in 80-100 mesh was chosen to treat 100mL simulated wastewater of NH4^＋-N 50mg/L and PO4^3--P 10mg/L, after 4h sorption, removal efficiency of NH4^＋-N and PO4^3--P were 79.4% and 93.0% respectively, with adsorption process characterized as high speed adsorption and deceleration adsorption. The best suitable pH value for removal of ammonium was neutral, it is beneficial to removal of phosphate when pH was acidic or alkali. With the increase of temperature, removal efficiency of ammonium decreased while that of phosphate increased. Adsorption isotherm of ammonium and phosphate on expanded vermiculite were adequately represented by Langmuir equation.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第11期32-36,共5页
Environmental Science & Technology
基金
国家高技术研究发展计划(2006AA06Z344)
浙江省科技厅重大专项(2006C13036)
关键词
膨胀蛭石
同步脱铵除磷
影响因素
等温吸附线
expanded vermiculite
simultaneous removal of ammonium and phosphate
influence factors
isotherm
