Avaliação Físico-Química De Águas Cinzas Armazenadas, Em Residências Unifamiliares / Physical-Chemical Evaluation of Storaged Gray Water, With a Purpose of Reuse

Abstract

Water reuse is presented as a viable alternative to minimize water scarcity. Knowing the qualitative characteristics of domestic effluents is important for the practice of reuse with sanitary safety. Since the reuse system requires reserving water, since the production and consumption of this effluent occurs at different times, changes in its characteristics must be considered. This work aimed to characterize the gray waters from the washing machine after storage. The washing machine effluents in two homes were evaluated after seven days of storage. The effluent from the first residence fit in the guidelines for various domestic uses such as flushing toilets and watering gardens. It presented low deterioration, in terms of dissolved oxygen, remaining in aerobic state after storage. The effluent from the second residence reached anaerobiosis after the storage period, requiring pre-treatment to reduce organic matter.