The relevance of sludge generated in wastewater biological treatment systems, with an emphasis on Ribeirão Preto, São Paulo, Brazil

DOI: 10.15343/0104-7809.200630.4.15

Abstract

Sewage treatment has been an important issue for public health and for environmental pollution control. It is necessary to
take into account that the elements present in urban and industrial wastewater have microbiological components and also have different
chemical compounds that can affect human health. Among those chemical constituents, heavy metals present in the wastewater can
contaminate the receptor rivers if they are not properly removed, representing a risk for human and environmental health. The present
work aims to discuss Biological Wastewater Treatment and the need to evaluate heavy metals present in the generated sludge, taking
into account its potential land application for soil quality improvement. Also, Ribeirão Preto’s Wastewater Treatment Station is presented
and its importance for public health and for preservation of hydrological resources in the region is pointed out.