Understand the meaning

[bgtesm]

Dear teacher,
What is grade water in
"Waste water treatment and grade water systems", it is related to plumping and drainage services in a building.
Thanks:roll:

 

[Neillythere]

I'm not a teacher, but "grade" means "ground level", so "grade water" is typically rain water and the like that is (normally) uncontaminated by sewerage or other pollutants.

Normally you would have:
a "Clean Water Sewer" (CWS) for "grade water"
a "dirty" or "foul" water sewer

and, on industrial sites, an "oily water sewer" that goes into a pit, where the oil and water are separated. The water can then be treated, reasonably free of oil, and the oil either disposed of separately or recycled to some stage in the process, where it can be recovered.

Hope this helps

 

[David L.]

Domestically, there are three types of water. There is Utility Grade Water, Working Grade Water and Drinking Water.
Utility grade water is water suited for watering your lawn and plants. It may not have had any treatment.
Working Grade Water needs to be higher quality because it runs through your plumbing, fixtures and water-using appliances. To make these essential household systems last longer and save you money, treated water is needed.
Drinking Water has to be of the highest quality.

Water can also be distilled to be suitable for laboratory-grade, analytical-grade or reagent-grade water – water which has been highly purified for specific uses in science or engineering.