Our procedure Drop the filter at 0.20 m 4 min of air bubble 1 min of purge High wash with 1100 m3h to 30 UTN Low wash with 375 m3h to 5 UTN (prevent high spike of turbidity in prefiltration) Prefiltration spike around 0.130 UTN and we want under .080 UTN takes about 20-30 min Turbidity while filtration usually .020 UTN all year around. In summer we use alum in washing to have no spike at all in prefiltration. All procedure takes around 1 h 30 min to back filtration. Filter is sand and actif carbon, 96 hours of filtration, around 100-150 m3 each filter. Do you have suggestion to improve our procedure?
How much of the initial high turbidity during the first part of the backwash is actually due to process water contaminant removal versus something like bed aeration induced sand and coal particle abrasion / erosion?
I would say that pretty much all of the turbidity visible here is from process water contaminant removal. Sand and coal particle abrasion has to be pretty low because they keep the same sand and coal in there for several years, like five to eight years or something like that. With backwashes every several days, if there were a lot of abrasion causing visible turbidity, the sand and anthracite coal wouldn't last nearly that long.
Thomas Pease some treatment plants have backwash water retention tanks that allow sediment to settle and reuse that water. After so long the sediment is sent to a lined pond to dry out.
It is a lot of water. Unfortunately, some plants, mostly plants that produce water for large cities, return the backwash water to the source i.e. river.
My teacher used your video in the presentation , topic was filteration😊
Our whole class used this video as presentation to understand backwashing...from IIT Bhubaneswar
Slowly? That's a tremendous volume drawing down; you just emptied a large swimming pool's worth of water in just a few seconds!
Our procedure
Drop the filter at 0.20 m
4 min of air bubble
1 min of purge
High wash with 1100 m3h to 30 UTN
Low wash with 375 m3h to 5 UTN (prevent high spike of turbidity in prefiltration)
Prefiltration spike around 0.130 UTN and we want under .080 UTN takes about 20-30 min
Turbidity while filtration usually .020 UTN all year around.
In summer we use alum in washing to have no spike at all in prefiltration. All procedure takes around 1 h 30 min to back filtration.
Filter is sand and actif carbon, 96 hours of filtration, around 100-150 m3 each filter.
Do you have suggestion to improve our procedure?
Super cool!!!
nice to watch
How can we get a design blueprint for a system that works in the same way?
How much of the initial high turbidity during the first part of the backwash is actually due to process water contaminant removal versus something like bed aeration induced sand and coal particle abrasion / erosion?
I would say that pretty much all of the turbidity visible here is from process water contaminant removal. Sand and coal particle abrasion has to be pretty low because they keep the same sand and coal in there for several years, like five to eight years or something like that. With backwashes every several days, if there were a lot of abrasion causing visible turbidity, the sand and anthracite coal wouldn't last nearly that long.
Don't get me wrong, there IS abrasion and wear over time, but I think it's just something that would be very hard to see visually during one backwash.
@@davidladner interesting. I guess most of it is going to be residual floc particles then...
awesome video. thanks!
Dr. Biswas brought me here!
I am also working in the wastewater field in Vietnam
that's so cool
Good
Good❤️
David sir plz tell me which city in this plant
Unfortunately, the plant managers asked me not to disclose the location.
where do they discharge all of that waste water
Thomas Pease some treatment plants have backwash water retention tanks that allow sediment to settle and reuse that water. After so long the sediment is sent to a lined pond to dry out.
Jared Sipes thanks seems like a lot of water
It is a lot of water. Unfortunately, some plants, mostly plants that produce water for large cities, return the backwash water to the source i.e. river.
wish they made this commercial pools aka Olympic size pools
@@jaredsipes6205 In sand filtration systems about 2%-3% of filtered water is used for the backwash process.