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The growing concern of environmental and sanitary surveillance about the safety and the quality in the hydric resources, guides the development of many researches to a revision of the current technological pattern, related to the administration of residues generated in the water treatment plants. This work evaluated main characteristics of the residues generated in water treatment plant with complete cycle in the Registro town (SP) and the correlation with quality of the environment, by studying physical-chemical effects of its discharge in the quality of water and sediment of Ribeira de Iguape River Basin. A monitoring program was established, verifying the attendance of the elements analyzed to the demands of federal legislations, such as Resolução CONAMA 357/2005 and Portaria 518. Some alterations were verified in the quality of superficial water of the receiving watercourse, in periods up to 4 hours after the discharge and for a distance of 50 m to the place of the discard of sludge. The descriptive analysis showed to be predominant the concentration of some metals during the discharge, as manganese. The analysis of the benthonic organisms pointed out that the groups observed as typical of the area were not directly affected by sludge discharge. The present study did not detect indications that the contamination verified reached Ribeira de Iguape River. However, the systematic discharging of the sludge may commit at long date the water quality of the receiving watercourse.

Abordagem sistêmica do sistema de tratamento de água de Registro, São Paulo, com ênfase na avaliação do impacto do descarte dos resíduos na bacia hidrográfica do Rio Ribeira de Iguape