碳化缓释除磷填料的制备与吸附特性分析

Preparation and Adsorption Characteristics Analysis on Carbonized Controlled-release Substance of Phosphorus Removal

制备了2种人工湿地除磷基质填料,碳化缓释Ca(OH)_2(简称1#填料)和铁盐改性Ca(OH)_2(2#填料),并与工程中常用的石灰石和细沙填料进行等温吸附对比实验,比较不同填料的除磷效果。通过等温吸附实验,发现1#填料和2#填料更符合Langmuir等温吸附方程,得到不同填料对磷的理论饱和吸附量分别为806.45 mg/kg(1#填料)、220.26 mg/kg(2#填料)、64.10 mg/kg(石灰石)和24.81 mg/kg(细沙)。结果表明,制备的1#填料和2#填料对磷元素具有较好的去除效果,与人工湿地常用基质填料相比,具有明显的实际应用优势,可用其强化人工湿地除磷效果。

Two kinds of substrates,carbonize slow-release Ca（OH）2（substrate 1#） and ferric salt modified Ca（OH）2（substrate 2#）,which used for artificial wetlands＇ dephosphorization were prepared. These substrates were compared with commonly used engineering materials,limestone and sand,by isothermal adsorption contrasting experiments for phosphorus removal efficiency. Through the experiments found that substrate 1# and substrate 2# adsorption data was well correlated by the Langmuir isotherm adsorption. The theoretic phosphorus saturation adsorption capacity was 806.45 mg/kg（substrate 1#）,220.26 mg/kg（substrate 2#）,64.10 mg/kg（limestone） and 24.81 mg/kg（sand） respectively. The results showed that substrate 1# and substrate 2# have effective phosphorus removal efficiency. Comparing with the commonly used artificial wetland substrates, substrate 1# and substrate 2# have obvious application advantages, can be used to improve the phosphorus removal effect in artificial wetland.