Greywater is water that has been used for washing dishes, laundering clothes, or bathing. Essentially, any water, other than toilet wastes, draining from a household is greywater. Although this used water may contain grease, food particles, hair, and any number of other impurities, it may still be suitable for reuse.
What Is Considered Grey Water?
The term “grey water” is used to describe wastewater that has been used in domestic activities such as laundry, dishwashing or showering.
Grey water may also come from commercial activities such as car washing or office buildings. It is not as dirty as black water, which comes from toilets, or industrial wastewater, but it still contains contaminants that can be harmful to human health or the environment if it is not properly treated.
There are three main types of grey water systems: centralised, decentralised and on–site. Centralised systems are typically found in large buildings or developments where the grey water is collected and treated at a central location before being discharged into the environment.
Decentralised systems are usually found in smaller developments or individual homes where the grey water is treated on–site before being discharged.
On–site systems are usually used for treating grey water from a single dwelling, such as a house or an apartment.
The benefits of using grey water include reducing the amount of water that needs to be treated at a wastewater treatment plant, reducing the volume of wastewater that is discharged into the environment, and providing a source of water that can be used for irrigation or other purposes. Grey water can also be a source of heat energy if it