矿化垃圾填料对污水中氮磷去除能力的动力学研究

矿化垃圾填料具备良好的粒径级配,表面为不规则的多面体,Fe、Al和Ca成分含量高,具备成为优良磷库的条件。培养实验结果可采用Langmuir吸附等温线模拟,计算所得矿化垃圾磷的饱和吸附量为2 914 mg.kg-1。矿化垃圾吸附磷的饱和吸附量和吸附速率均为粘土的3倍多,磷的解析率仅约为30%。硝化培养实验前24 h内,矿化垃圾中氨氮的浓度从129 mg N.kg-1下降到83.0 mgN.kg-1;硝酸盐氮含量相应地从137 mg N.kg-1上升到170 mg N.kg-1。而同期内粘土中氨氮的浓度下降和硝酸盐氮含量的上升幅度分别为矿化垃圾的1/2和1/6。反硝化培养过程中,矿化垃圾中硝酸盐氮零级动力学降解速率常数K值为粘土7.5倍。

Kinetic Analysis on Phosphorus Adsorption, Phosphorus Desorption, Nitrification, and Denitrification by Using Mineralized Refuse

Possessing good particle size distribution,the mineralized refuse has high contents of Fe,Al,and Ca,which might be the phosphorus pool.The absorption and desorption of phosphorus,nitrification,and denitrification in the mineralized refuse and clay were investigated by using batch incubation respectively.The variation of phosphorous adsorption in the mineralized refuse and clay is fitted the Langmuir isotherm equation.The maximum phosphorus adsorption capacity of the mineralized refuse is 2914 mg kg-1.Both the maximum adsorption capacity and adsorption rate of phosphorus in the mineralized refuse are 3 times higher than that of the clay.The desorption rate of phosphorus in the mineralized refuse is only about 30%.The NH4＋-N content in the mineralized refuse samples falls from 129 mg N kg-1 to 83.0 mg N kg-1 within the first 24 hours during the nitrification process.Accordingly,the NO3——N content in the mineralized is increased from 137 mg N kg-1 to 170 mg N kg-1.While the decrease of NH4＋-N content and the increase of NO3——N content in the clay is only 1/2 and 1/6 as large as that in the mineralized refuse respectively.During the denitrification process,the K-value of the fitted zero-order kinetics for NO3——N denitrification in the mineralized refuse is 7.5 times higher than that in the clay.