In the heart of Ho Chi Minh City, a team of researchers led by Cong-Sac Tran from the Key Laboratory of Advanced Waste Treatment Technology at Ho Chi Minh City University of Technology (HCMUT) is exploring an innovative approach to tackle the pressing issue of wastewater management in urban areas. Their work, published in the journal “Case Studies in Chemical and Environmental Engineering” (translated as “Case Studies in Chemical and Environmental Engineering”), focuses on the use of green roof systems to treat septic tank effluent, offering a sustainable solution that could reshape the future of urban infrastructure and the energy sector.
Rapid urbanization has led to a significant reduction in green spaces and an increase in the discharge of untreated wastewater, posing substantial environmental challenges. Tran and his team have turned to nature-based solutions, specifically green roof systems, to address these issues. Their study evaluated the performance of two ornamental climbers, Vernonia elliptica and Campsis radicans, in treating septic tank effluent under different hydraulic loading rates.
The results are promising. At a high hydraulic loading rate of 50 L/m².d, green roofs planted with Campsis radicans achieved impressive removal rates for organic matter, total nitrogen, and total phosphorus. “These values were nearly four times higher than those at the lower hydraulic loading rate,” Tran explains. This indicates that the system can handle higher volumes of wastewater efficiently, making it a viable option for urban areas with limited space.
Vernonia elliptica, on the other hand, showed slightly better pollutant removal efficiency and provided a larger green coverage area, enhancing the aesthetic and ecological value of the green roof. “The dual functionality of green roofs as a decentralized wastewater treatment system and a contributor to urban greening is a significant advantage,” Tran notes.
The commercial implications for the energy sector are substantial. Green roofs can reduce the energy demand for wastewater treatment, lower greenhouse gas emissions, and contribute to the overall sustainability of urban infrastructure. As cities continue to grow, the need for innovative and sustainable solutions like these will only increase.
This research highlights the potential of green roof systems to shape future developments in urban planning and wastewater management. By integrating vegetation into urban infrastructure, we can create more sustainable and resilient cities. As Tran puts it, “The future of urban infrastructure lies in the integration of nature-based solutions that deliver both ecological and economic benefits.”