ETE CRATEUS 2 - Secondary Wastewater Treatment in Crateús, Ceará

ETE CRATEUS 2 is a wastewater treatment plant located in Crateús, a municipality in the state of Ceará, Brazil. The plant serves a population of 1,173 people, classifying it as a small-scale facility within the regional sanitation infrastructure of the Nordeste region. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. Under Brazilian regulations (CONAMA resolutions and the National Sanitation Plan), secondary treatment is appropriate for communities of this size. The treated effluent is released into local water bodies that drain into the Poti River basin, which flows into the Parnaíba River and eventually reaches the Atlantic Ocean. The semi-arid climate of Ceará makes water resource management critical, and the plant plays a role in protecting downstream water quality for communities and ecosystems.

The plant's discharge enters local streams that feed into the Poti River, a tributary of the Parnaíba River, which flows into the Atlantic Ocean near the border of Piauí and Maranhão. The semi-arid Caatinga biome surrounding Crateús experiences seasonal droughts, making treated wastewater a valuable resource for maintaining base flows and supporting aquatic life. Downstream, the Parnaíba River delta supports diverse fish and bird populations, and the plant's secondary treatment helps reduce nutrient loading that could otherwise contribute to eutrophication in the river and coastal zone.