Avaliação de um sistema de tratamento de águas cinzas em edificação de campus universitário

Abstract

Chrispim, MC. Avaliacao de um sistema de tratamento de aguas cinzas em edificacao de campus universitario./ Evaluation of a greywater treatment system in a building of university campus [dissertation]. Sao Paulo (BR): Faculdade de Saude Publica da Universidade de Sao Paulo; 2014. Water reuse is an important tool that can contribute to the reduction of the pressures from human activities on water resources and to reduce the demand for potable water for purposes that do not require high quality water. Therefore, the main objective of this study was to evaluate a greywater collection and treatment system from lavatories, showers and washing machine aiming the non-potable reuse in buildings. The specific objectives were: to characterize in terms of quality and quantity the greywater from each source, to monitor a pilot system for synthetic greywater treatment and to analyze the quality of the effluent after treatment, to compare the pilot system with other greywater treatment processes, and to indicate potential non-potable uses for treated water. In an existing building in the University of Sao Paulo campus, the wastewater collection drains were modified to allow the segregated wastewater collection and the greywater characterization and treatment. To evaluate the greywater generation three water flow meters were installed in water inlet of each greywater source (washing machine, showers and lavatories). The greywater treatment included a moving bed biofilm reactor (MBBR) and a settling tank at pilot scale. The evaluation of greywater treatment was conducted based on the periodic monitoring of several physicochemical water quality parameters during the operation of the experimental system. Based on the results, amongst the three greywater sources, the greywater from showers had the highest E. coli count while the lavatories greywater had the highest total coliforms count. The removal efficiencies of BOD and COD were 59% e 70% respectively. In addition there was low removal of phosphorus and there was not Total Nitrogen Removal during the treatment.