Phytoremediation as a Nature-Based Solution for Cleaner River Systems: Mitigating Heavy Metal Contamination in Humid Tropical Environments

Heavy metal contamination in river systems poses persistent environmental and public health challenges, particularly in humid tropical regions where high rainfall, intensive land use, and dynamic hydrological processes exacerbate pollutant mobility and ecological vulnerability. Conventional remediation approaches are often energy-intensive, costly, and associated with secondary environmental impacts. In response, phytoremediation has emerged as a nature-based solution that aligns with cleaner production principles by integrating pollution mitigation with ecological restoration. This article critically examines phytoremediation as a sustainable strategy for mitigating heavy metal contamination in humid tropical river systems. Drawing on evidence from aquatic macrophytes, riparian vegetation, mangrove ecosystems, and plant–microbial interactions, the study highlights the effectiveness of phytoremediation in removing and stabilizing metals such as Pb, Cd, Cu, Cr, and Zn. The role of microbial communities in enhancing remediation efficiency through nutrient cycling and pollutant transformation is also explored. The findings demonstrate that phytoremediation offers a low-energy, low-emission, and ecologically restorative alternative to conventional remediation methods, contributing to cleaner river systems and long-term environmental resilience. The article concludes by proposing an integrated phytoremediation framework that supports cleaner production, sustainable river management, and nature-based environmental governance in humid tropical regions.

phytoremediation; heavy metals; humid tropical rivers; microbial interactions

1. Ali, S., Abbas, Z., Rizwan, M., Zaheer, I. E., Yavas, I., Ünay, A., Abdel-Daim, M. M., Bin-Jumah, M., Hasanuzzaman, M., & Kalderis, D. (2020). Application of floating aquatic plants in phytoremediation of heavy metals polluted water: A review. Sustainability (Switzerland), 12(5). https://doi.org/10.3390/su12051927 [Google Scholar] [Crossref]

2. Cruz-Cano, R., Bretón-Deval, L., Martínez-García, M., Díaz-Jaimes, P., & Kolb, M. (2025). Changes in Microbial Community Assemblages Due To Urban Pollution, Detected via rRNA Gene Amplicon Sequencing in the Magdalena River, Mexico City. Microbial Ecology, 88(1). https://doi.org/10.1007/s00248-025-02580-7 [Google Scholar] [Crossref]

3. Das, P., Samantaray, S., & Rout, G. R. (1997). Studies on cadmium toxicity in plants: A review. Environmental Pollution, 98(1), 29–36. https://doi.org/10.1016/S0269-7491(97)00110-3 [Google Scholar] [Crossref]

4. de Lima, D. V. N., Filho, C. M. L., Pacheco, A. B. F., & de Oliveira e Azevedo, S. M. F. (2022). Seasonal variation in the phytoremediation by Pontederia crassipes (Mart) Solms (water hyacinth) and its associated microbiota. Ecological Engineering, 183. [Google Scholar] [Crossref]

5. https://doi.org/10.1016/j.ecoleng.2022.106744 [Google Scholar] [Crossref]

6. Foulquier, A., Volat, B., Neyra, M., Bornette, G., & Montuelle, B. (2013). Long-term impact of hydrological regime on structure and functions of microbial communities in riverine wetland sediments. FEMS Microbiology Ecology, 85(2), 211–226. https://doi.org/10.1111/1574-6941.12112 [Google Scholar] [Crossref]

7. Gupta, U., Sharma, R., Prakash, M., & Goyal, S. K. (2025). Comparative assessment of phytoremediation efficiency of canna lily (Canna indica) and water hyacinth (Eichhornia crassipes [mart] solms) for heavy metal removal from wastewater. Bioremediation Journal. https://doi.org/10.1080/10889868.2025.2604130 [Google Scholar] [Crossref]

8. Kaur-Kahlon, G., Kumar, S., Rehnstam-Holm, A. S., Rai, A., Bhavya, P. S., Edler, L., Singh, A., Andersson, B., Karunasagar, I., Ramesh, R., & Godhe, A. (2016). Response of a coastal tropical pelagic microbial community to changing salinity and temperature. Aquatic Microbial Ecology, 77(1), 37–50. https://doi.org/10.3354/ame01785 [Google Scholar] [Crossref]

9. Lee, Z. M. P., Poret-Peterson, A. T., Siefert, J. L., Kaul, D., Moustafa, A., Allen, A. E., Dupont, C. L., Eguiarte, L. E., Souza, V., & Elser, J. J. (2017). Nutrient stoichiometry Shapes Microbial Community Structure in an Evaporitic Shallow Pond. Frontiers in Microbiology, 8(MAY). https://doi.org/10.3389/fmicb.2017.00949 [Google Scholar] [Crossref]

10. Li, S., Zhao, R., Wang, S., Yang, Y., Diao, M., & Ji, G. (2025). Influences of fluctuating nutrient loadings on nitrate-reducing microorganisms in rivers. ISME Communications, 5(1). https://doi.org/10.1093/ismeco/ycae168 [Google Scholar] [Crossref]

11. Liu, Y., Guo, W., Wei, C., Huang, H., Nan, F., Liu, X., Liu, Q., Lv, J., Feng, J., & Xie, S. (2024). Rainfall-induced changes in aquatic microbial communities and stability of dissolved organic matter: Insight from a Fen river analysis. Environmental Research, 246. [Google Scholar] [Crossref]

12. https://doi.org/10.1016/j.envres.2024.118107 [Google Scholar] [Crossref]

13. Najwa, N., Abdullah, S., & Mohd Noor, N. A. (2025). Phytoremediation as a sustainable approach for heavy metal removal from wastewater: Insights from Salvinia molesta , Pistia stratiotes , and Lemnoideae studies . IOP Conference Series: Earth and Environmental Science, 1548(1), 012029. https://doi.org/10.1088/1755-1315/1548/1/012029 [Google Scholar] [Crossref]

14. Rajoo, S. K., Ismail, A., Karam, S. D., Arifin, A., Izani, N., Gerusu, G. J., Ibrahim, Z., Abdullah, M. A., & Ibrahim, M. H. (2023). Determining the Phytoremediation Potential of Naturally Growing Tropical Plant Species at a Sanitary Landfill. Malaysian Journal of Soil Science, 27, 138–146. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85170100861&partnerID=40&md5=5ced8c16d166516d8bf60a2df26e7aa4 [Google Scholar] [Crossref]

15. Vignale, F. A., Bernal Rey, D., Pardo, A. M., Almasqué, F. J., Ibarra, J. G., Fernández Do Porto, D., Turjanski, A. G., López, N. I., Helman, R. J. M., & Raiger Iustman, L. J. (2023). Spatial and Seasonal Variations in the Bacterial Community of an Anthropogenic Impacted Urban Stream. Microbial Ecology, 85(3), 862–874. https://doi.org/10.1007/s00248-022-02055-z [Google Scholar] [Crossref]

16. Wen, J., Liu, S., Wang, Y., Khan, M. Y. A., Zhou, X., Li, S., Bao, Y., Cui, X., Huang, Z., Sun, M., & He, H. (2025). Spatiotemporal variations of bacterial communities and functional genes in the water and sediments of a typical river influenced by reservoir operations. Frontiers in Environmental Science, 13. https://doi.org/10.3389/fenvs.2025.1568871 [Google Scholar] [Crossref]

17. Wu, D., Zou, Y., Xiao, J., Mo, L., Lek, S., Chen, B., Fu, Q., & Guo, Z. (2024). The spatiotemporal variations of microbial community in relation to water quality in a tropical drinking water reservoir, Southmost China. Frontiers in Microbiology, 15. https://doi.org/10.3389/fmicb.2024.1354784 [Google Scholar] [Crossref]

18. Wu, S., Zhao, W., Liu, M., Gao, F., & Chen, H. (2023). Prokaryotic and Eukaryotic Communities Characteristic in the Water Column and Sediment along the Xiangjiang River, China. Water (Switzerland), 15(12). https://doi.org/10.3390/w15122189 [Google Scholar] [Crossref]

19. Yalcin, I. E., Altay, V., & Ozturk, M. (2025). Phytoremediation potential and ecophysiological features of water hyacinth Eichornia crassipes: a case study from Orontes River, Türkiye. Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering, 60(2), 66–78. https://doi.org/10.1080/10934529.2025.2497650 [Google Scholar] [Crossref]

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