基于烧结成型的红壤除磷填料开发

为了开发除磷填料，以红壤为基本材料，并以烧结温度、粉煤灰添加量、外加剂A用量和外加剂B用量作为4个因素设计正交实验，制造了不同配方的红壤烧结填料，进行等温吸附实验并利用Langmuir模型拟合最大吸磷量进行比较。结果表明，通过烧结可使粉末状红壤成型，同时提高了其除磷能力；对填料理论吸磷量的影响因素主次顺序为外加剂B用量、外加剂A用量、粉煤灰用量及烧结温度；通过比较理论吸附量，同时考虑到成本，可以确定正交实验结果中较优填料配方组成为（重量比）：61％红壤，30％粉煤灰，0％外加剂A，9％外加剂B，烧结温度1150℃，其最大理论的磷吸附量2．274mg／cm^2，单位除磷原料成本约0．047元／g．

Development of phosphate removal substrate based on forming and sintering process of red soil

To develop high performance phosphate removal substrate for wastewater treatment, different types of sintering red soil substrates were made based on orthogonal test including 4 factors, which were the dif- ferent sintering temperatures, fly ash, additive A and additive B. The phosphate removal abilities of different substrates were compared by isothermal adsorption experiment and the maximum adsorption capacity obtained by Langmuir model. Results show that blocking problem caused by the direct applying of red soil in wastewater treatment was resolved by forming and sintering process, and the phosphate removal capacity of red soil was also increased by using of fly ash and additive. The influencing order for phosphate removal capacity was additive B 〉 additive A 〉 fly ash amount 〉 sintering temperature. With the consideration of substrate production cost of per u- nit phosphate removed and phosphate removal capacity, the optimal substrate manufacturing formula was decided as follows （as weight） ： 61% of red soil, 30% of fly ash, 0% of additive A, 9% of additive B, sintering tem- perature of 1 150℃ , for which the theoretical phosphate adsorption capacity was 2. 274 mg/em3 and the raw ma- terial cost was 0. 047 RMB per gram phosphate removed.