污泥陶粒的功能化改性及含磷废水处理研究  

Study on functional modification of sludge ceramsite andtreatment of wastewater containing phosphorus

作　　者：郝禅光 李春立 李权 邢丽静 梁欢[1] 徐峥 HAO Changuang;LI Chunli;LI Quan;XING Lijing;LIANG Huan;XU Zheng(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430074,China;Yangtze Ecology and Environment Co.,Ltd.,Wuhan 430077,China)

机构地区：[1]武汉工程大学资源与安全工程学院,武汉430074 [2]长江生态环保集团有限公司,武汉430077

出　　处：《功能材料》2024年第4期4142-4151,共10页Journal of Functional Materials

基　　金：国家自然科学基金青年项目(52204279);长江生态环保集团有限公司科技创新团队项目(HBHB2023005);武汉工程大学研究生教育创新基金项目(CX2022595)。

摘　　要：随着城市规模的高速发展,市政污水的处理量陡增,导致污泥固废的处置问题日益显著。以污泥为主要原料,添加粉煤灰、蒙脱石为辅料制备多孔陶粒(SC),采用共沉淀法进行功能化改性,制备得到镧改性污泥陶粒(L-SC)和镧铁改性污泥陶粒(LF-SC)。以pH值、投加量以及干扰阴离子为实验因素考察对模拟含磷废水中磷吸附的性能,通过分析表征讨论对磷的吸附机理。结果表明,L-SC和LF-SC具有致密的孔结构,S_(BET)分别为17 148.7和17 439.2 cm^(2)·g^(-1),改性陶粒的吸附性能明显优于SC,在pH=5时L-SC对磷的去除率最高可达93.74%,而LF-SC对磷的去除率更高且吸附效果受pH影响较小,在5≤pH≤9时磷去除率均在97%以上,拟二级动力学模型和Freundlich模型能较好地描述改性陶粒对磷的吸附。FTIR和SEM-EDS结果显示,过渡金属Fe对稀土金属La具有明显的活化作用,极大提高了陶粒的吸附性能,吸附磷酸盐的主要机制为静电引力和配体交换形成稳定络合物。With the rapid development of urban scale,the amount of municipal sewage treatment increases sharply,which leads to the disposal of sludge solid waste.The porous ceramsites(SC)were prepared with sludge as the main raw material and fly ash and montmorillonite as the auxiliary materials,and functionalized by co-precipitation method to obtain lanthanum modified sludge ceramsites(L-SC)and iron lanthanum modified sludge ceramsites(LF-SC).The pH,dosage and interference anion were the experimental factors to investigate the adsorption performance of phosphorus in simulated wastewater containing phosphorus,and the adsorption mechanism was discussed through analysis and characterization.The results showed that L-SC and LF-SC have dense pore structures with S BET of 17148.7 cm^(2)/g and 17439.2 cm^(2)/g,respectively.The adsorption performance of the modified ceramsite was significantly better than that of SC,and the phosphorus removal rate of L-SC was up to 93.74%at pH=5.However,the phosphorus removal rate of LF-SC is higher and the adsorption effect is less affected by pH,and the phosphorus removal rate is above 97%when 5≤pH≤9.Pseudo-second-order kinetic model and Freundlich model can better describe the adsorption of phosphorus by modified ceramsites.The results of FTIR and SEM-EDS showed that transition metal Fe had obvious activation effect on rare earth metal La,which greatly improved the adsorption performance of the ceramsites.The main mechanism of phosphate adsorption was electrostatic attraction and ligand exchange to form stable complexes.

关 键 词：污泥 陶粒 改性 除磷 

分 类 号：X705[环境科学与工程—环境工程]