-Wastewater definition;

-Treatments;

-Wastewater reused for washing streets;

-Conclusions.

Wastewater:

Water that has been used, as for washing, flushing, or in a manufacturing process, and so contains waste products.

· Black water:  containing waste due to domestic or industrial and human activities (harmful to health).

Black water

· Urban wastewater:

mixture of domestic wastewater, industrial wastewater channeled into sewers and from agglomeration;

Urban wastewater

· Domestic wastewater:

wastewater from residential settlements and services which originates predominantly from the human metabolism and from household activities such as cooking and washing;

· Industrial wastewater:

wastewater discharged from buildings where it carries on a trade or production of goods, also from cultivation and livestock;

Industrial water

· White water: is not considered harmful to health

· Surface run-off wastewater.

· Cleaning streets wastewater.

Washing streets:

This water is considered white water, after the treatments it can be reuse. 

Water is re-used for washing streets because every day in the city streers the dust particles are depoised there.