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Glossary entry

Spanish term or phrase:

caudales filtrados (en l/s/m)

English translation:

volume of water filtered (in liters|litres/second/ sq meter [sq missing!]]

Added to glossary by MPGS
Jul 16, 2016 10:34
7 yrs ago
1 viewer *
Spanish term

caudales filtrados (en l/s/m)

Spanish to English Tech/Engineering Engineering (general) river water filtration
l/s would be litres/second, but I can't find any reference to the 'm' in this context. SLM can mean standard metres per minute in English, but this unit is confined to gas flows.
Proposed translations (English)
4 +1 volume of water filtered (in liters|litres/second/ sq meter
References
caudal por metro
Change log

Jul 21, 2016 18:54: MPGS Created KOG entry

Discussion

James Arthur Williamson (asker) Jul 16, 2016:
Thanks to both for your kind help.
James Arthur Williamson (asker) Jul 16, 2016:
Neil: I agree that MPGS's suggestion was correct and that litres/second/square metre is the correct answer to my query. The filter is in two parts: a 4-m high vertical gabion filter using sand and geotextile mesh, and an 8-m long horizontal filter composed of two layers of gravel separated by geotextile in the feeder canal.
Neil Ashby Jul 16, 2016:
Re MPGS's comment "or maybe the filters have just 1 significant dimension (lenght, depth) in which case litres/second/ meter would be correct"; now that is illogical.

Equally off the mark is "ventilation air flow: "liters per second per square meter of floor area" >> this has nothing to do with filtration rates, simply air flow rates. "per sq meter of floor area" is just saying how big a house/room the unit can cover.
Neil Ashby Jul 16, 2016:
Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The length and breadth of the tanks are determined by the flow rate desired by the filters, which typically have a loading rate of 0.1 to 0.2 metres per hour (or cubic metres per square metre per hour).

https://en.wikipedia.org/wiki/Slow_sand_filter
Neil Ashby Jul 16, 2016:
See, for example,

Slow Sand Filtration for Water Treatment - Oasis Design
oasisdesign.net › Water Central
With the recent issuance of the Surface Water Treatment Rule by the U.S. .... and at slow rates of water filtration (100-200 l/hr/m2 surface area of filter), are acted .... If the river water turbidity is around 20 units or less, except at certain periods of ...

"Water, Municipal Water Treatment". In: Kirk-Othmer Encyclopedia of ...
onlinelibrary.wiley.com/doi/10.1002/0471238961.1321140919091407.a01/pdf
to filter Thames River water. ... High rate design filtration rate, L/(s·m2 )b. 0.081–0.162. 1.36. 2.72–6.83 ... b To convert L/(s·m2 ) to gal/(s·ft2), divide by 40.74.
Neil Ashby Jul 16, 2016:
Thanks James, do you have any information about the filters, are they in tubes? Do we know the diameter of the tubes?

MPGS' suggestion is not illogical - he's saying that the filter system is filtering X L (or m3) of river water per second for each square metre of filter surface area. >>>> L/s/m2 or m3/s/m2
James Arthur Williamson (asker) Jul 16, 2016:
It occurs numerous times in the text (specifications for a sand filtration system for river water intended for industrial use). A typical example: "Se ha dispuesto de la información registrada en obra respecto de la altura del nivel del agua en el río (en metros) y de los caudales filtrados (en l/s/m), en dos puntos de control diferentes; SK2 y SK5, respectivamente."
Neil Ashby Jul 16, 2016:
Full context please!

Proposed translations

+1
11 mins
Selected

volume of water filtered (in liters|litres/second/ sq meter

I guess the 'sq' (filter area) is missing
:-)

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Note added at 41 mins (2016-07-16 11:15:52 GMT)
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James,
you are right!
But I didn't say cubic meters, I sald square meters
litres/second/ sq meter is a measure of the filter efficiency
Rgds
:-)

--------------------------------------------------
Note added at 43 mins (2016-07-16 11:18:34 GMT)
--------------------------------------------------

... or maybe the filters have just 1 significant dimension (lenght, depth) in which case litres/second/ meter would be correct
:-)

--------------------------------------------------
Note added at 1 hr (2016-07-16 12:15:08 GMT)
--------------------------------------------------

... I should have said 1 significant additional dimension
... additional to the essential one that is the filter area
:-)

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Note added at 5 days (2016-07-21 18:53:27 GMT) Post-grading
--------------------------------------------------

Thanks to Neil and you
:-)
Note from asker:
Both litres and m3 are units of volume. In fact m3/s is an alternative flow rate unit to l/s. In other words, litre/second/m3 is illogical.
MPGS, thanks for the clarification. From that point of view it does seem to be a fit the context.
I have found the unit in a different context: ventilation air flow: "liters per second per square meter of floor area" so I daresay you are right. Thanks!
Peer comment(s):
agree Neil Ashby : "only 1 significant dimension"?! Now that is crazy! I think it would be a mistake to bend your already correct answer because the asker struggles to understand the concepts involved./Valid pts. I was imagining an infinitely long "filter thread". ;@)
1 hr
Thank you Neil. I think my 1st guess has the most chances. But it could well be that they are comparing rivers of different width or filters thinner or thicker. Problem with lack of context. Best :-) // Thx :-)
Something went wrong...
4 KudoZ points awarded for this answer.

Reference comments

1 hr
Reference:

caudal por metro

VSD15. Difusores de ranura - Trox
www.trox.es/downloads/.../2_1_sp_3_vsd15.pdf?type=product.....
Translate this page
Definiciones. V . en l/s · m: Caudal de aire por metro. V . en m3/h · m: Caudal de aire por metro. V . t en l/s: Caudal de aire total. V . t en m3/h: Caudal de aire total.
[PDF]QLE. Difusor por desplazamiento
www.trox.mx/downloads/1c94996d288fc89b/1_6_1_sp_2.pdf?...
Translate this page
en l/s · m: Caudal de aire por metro. ‡ en m3/h · m: Caudal de aire por metro. ‡t en l/s: Caudal total de aire. ‡t en m3/h: Caudal total de aire. L en m: Distancia al ...
[PDF]Tipos de acuíferos y parámetros hidrogeológicos - chilorg
chilorg.chil.me/download-doc/86199
Translate this page
específico (q) de una captación si q está expresado en L/s/m. El caudal específico (q). (que se obtiene en el inventario de puntos de agua que se describe más ...


--------------------------------------------------
Note added at 5 hrs (2016-07-16 16:10:53 GMT)
--------------------------------------------------

lo que yo te propongo es l/s . metro, no por m2.
Note from asker:
Thanks Forgas. This unit (litres/second/metre2) has already been suggested by MPGS and confirmed by Neil Ashby, and is the correct answer. The fact that it can be used to measure air flow over a surface as well as water flow through a filter does not invalidate your response. However, the points will go to the first correct answer.
Something went wrong...
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