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Sustainable sewage solutions for small agglomerations
A Galvão1, J Matos, J Rodrigues
1Technical University of Lisbon, Av. Rovisco Pais, 149-001 Lisboa, Portugal. agalvao@civil.ist.utl.pt
Summary
Constructed wetlands offer a sustainable solution for small rural wastewater treatment plants (WWTPs). These systems show promise due to lower power needs and construction costs, especially for communities under 500 inhabitants.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Sustainable Infrastructure
Background:
- Many European countries require effective wastewater treatment for small rural communities.
- Investment in small Wastewater Treatment Plants (WWTPs) is increasing.
- Challenges include high operational costs, labor demands, and negative visual impacts.
Purpose of the Study:
- To evaluate sustainability indicators for 21 small secondary Wastewater Treatment Plants (WWTPs).
- To compare conventional (trickling filters, extended aeration) and non-conventional (constructed wetlands) systems.
- To identify cost-effective and resource-efficient wastewater treatment solutions for rural areas.
Main Methods:
- Data collection on sustainability indicators for 21 WWTPs.
- Analysis of allocated area per inhabitant.
- Assessment of concrete, power, and construction/installation costs per inhabitant.
Main Results:
- Constructed wetlands demonstrate potential as a sustainable wastewater treatment option.
- These systems are particularly suitable for rural areas with populations below 500 inhabitants.
- Lower power requirements and construction costs were observed for constructed wetlands.
Conclusions:
- Constructed wetlands present a promising, sustainable alternative for small rural WWTPs.
- The technology offers advantages in terms of energy efficiency and cost-effectiveness.
- Selection of appropriate technologies is crucial for resource-efficient wastewater management in rural settings.