Removal of nitrobenzene from wastewater by vertical flow constructed wetland and optimizing substrate composition using Hydrus-1D: optimizing substrate composition of vertical flow constructed wetland for removing nitrobenzene from wastewater
Nitrobenzene is a toxic chemical that is mainly used in industries to produce aniline and many other products, and eventually it is excessively present in industrial wastewaters. In this study, NB removal efficiency data were obtained by experimental scale vertical flow constructed wetlands. Four columns with same size and diameter named as A, B, C and D were used for the experiment and filled with the substrate in three layers having different soil compositions. Synthetic wastewater was prepared in the laboratory and fed to all the wetland columns. The Hydrus-1D model was used to mimic the removal and transport of nitrobenzene by these data with the same boundary conditions. The values of NB removal and the influence of water content and hydraulic conductivity were compared with all the columns, and best composition of substrate was selected on the basis of maximum removal of nitrobenzene. 76.2% was the maximum removal efficiency of NB exhibited by column D, while column A, B and C were having 50.2%, 55.8% and 65.9%, respectively.
KeywordsConstructed wetland Hydrus-1D Nitrobenzene Substrate
We acknowledge the funding support from the project Science and Technology Support Project Plan and Social Development of Jiangsu Province (Project No. BE2011732).
- Erfani Agah A, Wyseure G (2013) Numerical modeling of transport and transformation of synthetic wastewater in irrigated soils using HYDRUS-1D. Int J Agric Biol 15:541–546Google Scholar
- Kadlec R, Knight R (1996) Treatment wetlands. CRC Press, Baca RatonGoogle Scholar
- Paing J, Guilbert A, Gagnon V, Chazarenc F (2015) Effect of climate, wastewater composition, loading rates, system age and design on performances of French vertical flow constructed wetlands: a survey based on 169 full scale systems. Ecol Eng 80:46–52. https://doi.org/10.1016/j.ecoleng.2014.10.029 CrossRefGoogle Scholar
- Simunek J, Van Genuchten MT, Sejna M (2005) The HYDRUS-1D software package for simulating the one-dimensional movement of water, heat, and multiple solutes in variably-saturated media. Univ Calif Riverside Res Rep 3:1–240Google Scholar
- Van der Perk M (2013) Soil and water contamination. CRC PressGoogle Scholar
- Zhao L, Ma W, Ma J, Wen G, Liu Q (2015) Relationship between acceleration of hydroxyl radical initiation and increase of multiple-ultrasonic field amount in the process of ultrasound catalytic ozonation for degradation of nitrobenzene in aqueous solution. Ultrason Sonochem 22:198–204CrossRefGoogle Scholar