ABSTRACT: The main objective of this study was to verify the impact of the greywater reuse system to flush toilets in wastewater flow rates of a multifamily residential building. The monitoring of blackwater and dark greywater was carried out installing a Parshall flume measurement system, and the flow rates of light greywater were measured with the installation of hydrometers. The monitoring was performed by daily readings of all the meters in the building starting 8 am, and also the survey of the four 24h production profiles. 64% of the wastewater produced corresponds to the total light greywater production. 22% correspond to the dark greywater and 14% to blackwater. The intervals of higher per capita production observed were: from 10 am to 12 pm for dark greywater and from 6am to 8am for blackwater. The time range of higher total wastewater production was from 10am to 12pm, when it was produced 85.09 ℓ/per.2h on average. The per capita production indicator of light greywater obtained was 152.02 ℓ/per.day, the indicator of dark greywater was 52.64 ℓ/per.day, and the indicator of blackwater production was 33.46 ℓ/per.day. The average per capita production of WWNetwork was 215.62 ℓ/per.day. The reduction impact in WWNetwork due to the reuse was 9.45% in the monitored building in this work.
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