Assessment of kinetic models on Fe adsorption in groundwater using high-quality limestone

4th International Conference on Civil and Environmental Engineering for Sustainability

地球科学;生态环境科学;经济学

Akbar, N.A.^1,3 ; Mohd Kamil, N.A.F.^4 ; Md Zin, N.S.^4 ; Adlan, M.N.^1,3 ; Aziz, H.A.^1,2

School of Civil Engineering, University Sains Malaysia, Nibong Tebal, Penang

14300, Malaysia^1

Solid Waste Management Cluster, Engineering Campus, Universiti Sains Malaysia, Malaysia^2

Faculty of Civil Engineering, UiTM Pulau Pinang, Permatang Pauh, Penang

13500, Malaysia^3

Water and Environmental Engineering Department, Faculty of Civil and Environmental Engineering, UniversitiTun Hussein Onn Malaysia, BatuPahat, Johor, Malaysia^4

关键词: Adsorption kinetics;    Batch adsorption experiments;    Coefficient correlations;    Diffusion process;    Groundwater pumping;    Intra-particle diffusion;    Pseudo second order;    Pseudo-first-order;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/140/1/012030/pdf
DOI  :  10.1088/1755-1315/140/1/012030

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

During the groundwater pumping process, dissolved Fe2+is oxidized into Fe3+and produce rust-coloured iron mineral. Adsorption kinetic models are used to evaluate the performance of limestone adsorbent and describe the mechanism of adsorption and the diffusion processes of Fe adsorption in groundwater. This work presents the best kinetic model of Fe adsorption, which was chosen based on a higher value of coefficient correlation, R2. A batch adsorption experiment was conducted for various contact times ranging from 0 to 135 minutes. From the results of the batch study, three kinetic models were analyzed for Fe removal onto limestone sorbent, including the pseudo-first order (PFO), pseudo-second order (PSO) and intra-particle diffusion (IPD) models. Results show that the adsorption kinetic models follow the sequence: PSO > PFO > IPD, where the values of R2are 0.997 > 0.919 > 0.918. A high value of R2(0.997) reveals better fitted experimental data. Furthermore, the value of qe calin the PSO kinetic model is very near to qe exp rather than that in other models. This finding therefore suggests that the PSO kinetic model has the good fitted with the experimental data which involved chemisorption process of divalent Fe removal in groundwater solution. Thus, limestone adsorbent media found to be an alternative and effective treatment of Fe removal from groundwater.