Poluição difusa do Rio Sucuru: avaliações e diretrizes.

Abstract

In the brazilian semi-arid zone, one of the challenges of the integrated management of water resources is to offer quality for a specific use. The objective of this work was to evaluate the impacts of diffuse pollution through análisis of raw water quality parameters, in a stretch of the Sucuru alluvium, sub-basin of the Paraíba river, Sumé city, Paraíba State, Northeast of Brazil. The Sucuru river alluvial aquifer has an area of 351ha and an estimated storage capacity of 1,700,000m³, receives a high load of treated and untreated urban domestic sewage, domestic and agricultural from rural areas. The evaluation of the effects of diffuse polution, in urban and rural areas, was carried out through physical-chemical and microbiological analyses, monthly and bimonthly. Thermotolerant coliforms and E. coli were identified in all Wells, in the dry and rainy seasons, which confirms the fecal contamination of the aquifer. According to the reference values established by MS Ordinance nº. 2914/2011, CONAMA Resolution nº. 396/2008 and Consolidation Ordinance nº. 5/2017, the máximum permitted values (MPV) for most physical-chemical quality parameters were exceded, except for pH, between 2015 and 2017, which implies restriction of water use for irrigation for most agricultural crops. Controlled recharge management measures must be implemented, such as the complete collection of sewage from the urban area of the Sumé city, its interconection to the treatment plant, as well as the impelmentation of descentralized solutions sewage treatment in rural areas.