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Low cost sewerage systems in Tegucigalpa

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The choice of technology was based on construction cost in contrast with traditional sewage design. The small-bore sewage systems (solid free sewerage) convey the domestic sewage which settled on-site in a septic tank. Only the settled sewage is discharged into the sewage pipes to the main collector. The community provided the manual labour (each household had to excavate 15m of trench and some local construction materials including PVC accessories. UNICEF in partnership with Cooperative Housing Foundation (CHF) provided families with near-market-rate credit to construction of household sanitary services such as toilet, shower etc.

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The Experience of Condominial Water and Sewerage Systems in Brazil

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This project illustrate and compared the experience of the implementation of the condominial model in three Brazilian cities: Brasilia (the nation’s capital); Salvador (a major, historic metropolis in northeastern Brazil); and Parauapebas (a small but fast-growing boom town). Together, the projects analyzed have succeeded in providing condominial networks to 2.5 million urban residents in Brazil, with 214,000 connections organized in close to 16,000 condominiums.

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Simple and Low Cost Fixed Film Bio-Reactors for Improved Wastewater Treatment

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Wastewater Lagoon efficiency can be dramatically improved by promoting the growth and development of beneficial microbial colonies. Diverse bacterial colonies consume water-borne contaminants, but such colonies can only exist within a thin bio-film attached to submerged surfaces. Beneficial bio-films thrive when they are protected from sunlight, and exposed to optimal degrees of aeration and nutrient mixing.

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