Calculating Volume of Water/Air Needed for Filter Backwashing

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Discussion Overview

The discussion revolves around determining the volume of water or air required for backwashing a filter used to remove impurities from water. Participants explore various methods and considerations related to the cleaning process of the filter's internal materials, specifically the beads used for filtration.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes the specifications of their filter, including its dimensions and the need for backwashing to clean the beads inside.
  • Another participant suggests using a flowmeter to measure the amount of water or air needed for backwashing.
  • Several participants propose using a bucket and a stopwatch as a simpler method for measuring flow, with one humorously referring to it as the "poor man's flowmeter."
  • Another participant mentions using a graduated container to accurately measure the volume of water collected during backwashing.
  • One participant emphasizes that the original question pertains to calculating the exact volume of water needed for backwashing, not the measurement method.
  • A later reply suggests that determining the exact volume may involve trial and error, noting that the required amount could depend on factors such as the dirtiness of the beads and the type of deposits present.

Areas of Agreement / Disagreement

Participants generally agree on the need for backwashing and the importance of measuring the volume of water or air used, but there is no consensus on a specific method for calculating the exact volume required. Multiple competing views on measurement techniques and approaches to determining the necessary volume remain.

Contextual Notes

Participants acknowledge that the amount of water needed for effective backwashing may vary based on conditions such as the level of contamination in the beads and the nature of the deposits, indicating that assumptions about these factors are necessary for any calculations.

Bashir2008
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I have a filter for removal the impurities from the water.. this filter has a cross sectional area about 0.07065m2... and volume is 0.1766m3..

some materials ( beads ) were put inside the filter in order to filter the water.. the packed bed was around 0.60m length..and its volume was 0.046m3 of the filter..

The length of the filter is 2.5m and diameter is 0.30m

the beads ( materilas ) inside the filter need to be washed from time to time.. for this reason we use water or air for backwashing

My question: how could we know how much water or air that we have to pump it to the filter to clean these materials ?

You can make any assumptions if u need

I really need your help to solve this question.

Best regards
 
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Bashir2008 said:
I have a filter for removal the impurities from the water.. this filter has a cross sectional area about 0.07065m2... and volume is 0.1766m3..

some materials ( beads ) were put inside the filter in order to filter the water.. the packed bed was around 0.60m length..and its volume was 0.046m3 of the filter..

The length of the filter is 2.5m and diameter is 0.30m

the beads ( materilas ) inside the filter need to be washed from time to time.. for this reason we use water or air for backwashing

My question: how could we know how much water or air that we have to pump it to the filter to clean these materials ?

You can make any assumptions if u need

I really need your help to solve this question.

Best regards

Use a flowmeter.

CS
 
...or a bucket and a stopwatch.
 
FredGarvin said:
...or a bucket and a stopwatch.

Ah...the poor man's flowmeter! :smile:

I've actually done that before! :approve:

CS
 
I do it quite often. It's hokey, but it works.
 
I don't use a bucket, but a container that is graduated. That way I actually know how much water has been collected.
 
A 5 gallon bucket does surprising well.
 
FredGarvin said:
...or a bucket and a stopwatch.

lmao. since we're all talking about buckets and stop watches... the most extreme bucket/stopwatch flow measurement I did was at a dock in Rotterdam. Found a rusty old 55 gallon drum that was dumped in a field. Took 20 seconds to fill it with sea water... That ruled out a pump problem for me! :smile:
 
Sorry but you misunderstood me.. i did not mean how we measure the flow..

my question was : how could we know how much water we need exactly for this filter... and not how to measure it..
 
  • #10
Bashir2008 said:
Sorry but you misunderstood me.. i did not mean how we measure the flow..

my question was : how could we know how much water we need exactly for this filter... and not how to measure it..

Probably trial and error. You can obviously calculated the volume of water needed to flush the system, but the amount of time to flow through it in order to clean the beads would be a function of how dirty they are, what type of deposits are in the system, etc..

CS
 

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