What is meant by the terms Gray water and black water ?

“Gray water" are also known as the "untreated household wastewater which has not come into contact with toilet waste. Gray water includes used water from bathtubs, showers, bathroom wash basins, and water from clothes- washer and laundry tubs. It shall not include wastewater from kitchen sinks or dishwashers. ” However, in some states and local authorities, kitchen sink wastewater are considered to be included in gray water.  Therefore, Project teams should always check and comply with gray water definitions as established by the authority having jurisdiction in their areas.

 

"Black water" does not have a single definition that is accepted nationwide. Wastewater from toilets and urinals is, however, always considered black water.

A GRAY WATER is the water from (lavatories , showers , some sinks & Bathtubs) .

You can collect the gray water into tank and transport it to treatment system to use this water for irrigation and flushing .

A BLACK WATER is the water from (w.c's and dirty sinks ) .

It has transported to septic tanks & others cesspools 

Grey water is untreated waste water from which has not come into contact with toilet waste. It includes water from bathtubs, showers, wash basin, clothes washers and laundry tubs. Some definitions include kitchen sinks or dishwaters. Black water is the waste water from toilets and urinals.

the term grey water used for the industrial process waste water, while black water refer to the water comes from domestic facility like washrooms etc.

GREY WATER is the water from bathtub,washbasin,and floor traps 

BLACK WATER is the waste water from WC and URINALS.

 

The concept of grey water and black water came into existence based on the level of recycling the water gey water can be recycled and black water can be utilized for irrigation purposes.

Blackwater is used to describe wastewater containing feces, urine and flushwater from flush toilets along with anal cleansing water (if water is used for cleansing) or toilet paper.[1] It is distinct from greywater or sullage, the wastewater generated from washing food, clothes and dishware, as well as from bathing, but not from toilets.

Greywater (also spelled graywater, or grey water/gray water) or sullage is all wastewater generated in households or office buildings from streams without fecal contamination, i.e. all streams except for the wastewater from toilets. Sources of greywater include, e.g. sinks,showers, baths, clothes washing machines or dish washers. As greywater contains fewer pathogens than domestic wastewater, it is generally safer to handle and easier to treat and reuse onsite for toilet flushing, landscape or crop irrigation, and other non-potable uses. However, the use of non-toxic and low-sodium soap and personal care products is recommended to protect vegetation when reusing greywater for irrigation purposes.[1] The application of greywater reuse in urban water systems provides substantial benefits for both thewater supply subsystem by reducing the demand for fresh clean water as well as the wastewater subsystems by reducing the amount of wastewater required to be conveyed and treated.[2]

Greywater, by definition, does not include the discha