Abstract

MATSUMOTO, Tsunao  and  SANCHEZ ORTIZ, Iván Andrés. EFFICIENCY OF WASTEWATER TREATMENT BY FACULTATIVE LAGOONS AND PUBLIC HEALTH IMPLICATIONS. Univ. Salud [online]. 2010, vol.12, n.1, pp.65-78. ISSN 0124-7107.

The main objective of this research was to evaluate the situation of the Ilha Solteira'44;s (SP) Sewage Treatment Plant (STP) in connection with its efficiency, sludge accumulation and possible effects on public health produced by the quality in the final effluent. The research consisted in the batimetric study of the facultative primary stabilization ponds and a 24 consecutive hours monitoring in which there were characterized the affluent, the effluents and the STP physical conditions, and the Station behavior in relation to the wastewater treatment was diagnosed. It was established that despite the fact that the effluent organic load was between the recommended levels, the Biochemical Oxygen Demand efficiency removal of 78% was very near to the minimum values allowed by the Brazilian current Legislation; the total and faecal Coliforms, and total solids concentrations at the effluent exceeded the permitted values. However, the settleable solids concentration achieved the environmental regulation with values lower than 1,0mL/L.The results indicated that the STP requires operational controls and more effective maintenance. It was showed the need to install a post treatment system that guarantees the reduction of the environmental impacts produced by the effluents and the public health risks in the discharge zone as well as in the downstream of the final dump point.

Keywords : Wastewater; treatment; facultative lagoons; monitoring; public health.

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