What is it about?
For cities without public services, the DWSI strategy has been suggested as an option to enable easier and more rapid responses in terms of sewage pollution control. The strategy may also lead to gradual construction of a separate sewerage system in a two-step plan: initially, based on the construction of DWSIs and wastewater treatment plants, and then, on the construction of separate sewers. As overflow structures, dry-weather sewage intakes (DWSIs) are used to intercept and transfer sewage from storm- to sewage- sewers. The paper is a discussion of the main technical challenges in sustainability of the DWSI strategy, and includes a case study of slum and other informal housing areas in Rio de Janeiro.
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Why is it important?
Even though good results may be achieved through this model, care, understanding and technical agreement are needed between stakeholders to gain the most from the concept and avoid its negative points.
Perspectives
Brazilian cities face economic and political opportunities for the planning and expansion of sewerage systems, and the DWSI strategy option still requires official technical guidelines.
ISAAC VOLSCHAN JR.
Federal University of Rio de Janeiro
Read the Original
This page is a summary of: The challenge of dry-weather sewage intakes as a sustainable strategy to develop urban sanitation in the tropics, Water Practice & Technology, December 2019, IWA Publishing,
DOI: 10.2166/wpt.2019.084.
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