In this research work, some characteristics of non-household effluents which are conveyed into the sanitary sewerage system of São Paulo’s Metropolitan Region (SPMR’s Sewerage System) were correlated to maintenance data. Measurements of inferior limit of explosion and sulfide concentrations in the sewage mains and interceptor lines were also conducted. The results led us to conclude that the current non-domestic effluent collection criteria in SPMR’s Severage System are not effective with regard to physical and operational interferences. Auxiliary products, raw materials and the production process flux itself must be taken into consideration in the analysis made to evaluate whether or not such effluents can be conveyed into the Severage System. There must be communication among the sectors involved in the operation of SPMR’s Sewerage System and the responsible Sewerage Company in charge should monitor the inferior limit of explosion at all times.
Non-household effluents; publicly owned treatment works; sewerage system; environmental legislation
