Binalarda su kazanımı potansiyeli: Gri suyun yeniden kullanımı

Greywater treatment and reuse is an alternative to provide non-potable water to households and reduce the fresh water usage. The aim of the study was to evaluate the water saving potential of buildings. A 5-story building was chosen as case study and the existed fixtures of this building were determined. The amount of total wastewater and greywater was calculated regarding to average accepted values. It was assumed that 48 people are living in this building, considering 12 apartments in the building and four people live in each apartment. Total amount of wastewater and greywater was calculated as 9600 and 5900 litre per day, respectively. To collect greywater separately, some infrastructure modifications are required. Therefore, new fixtures were designed for the separation of greywater from black water. The cost of existing fixture implementation and new fixture installation was determined as 13,282 dollars and 13,990 dollars, respectively. It was assumed that separately collected greywater will be treated by a constructed wetland system. The treatment system was consisted of a two-way valve, a coarse filter, an equalization tank, a vegetated submerged bed wetland, and UV disinfection. It was assumed that treated greywater is pumped to the 5 metre cubic storage tank and it is used for toilet flushing and irrigation of garden. As a result, water saving potential of this building, and the investment and operational cost of the reuse of greywater were calculated. Based on these data, the amortization period of additional investments was determined as 6 years.