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Old 19-05-2017, 10:54 PM   #1
Ong88

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Smile DIY Moving Sand bed filter

Share my past two weeks tinkering.


11 May 2017
IBS today.
Totally bushed trying to balance flow rate with different pump heads to achieve total fluidisation of all the sand.
One pump head koyak, I forgot to rinse backflow of sand before restarting it.

Still not 100% of sand fluidised.
Need to tinker again tomorrow.

YouTube Video
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YouTube Video
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12 May 2017
Changed to river sand.
Previously was coral sand from tank substrate : big mistake, the calcium carbonate was dissolving and clouding tank water.

Still can't get the river sand fluidised, will need a container with smaller base.

YouTube Video
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15 May 2017
Finally fluidised properly with change to Denerle Nano Garnelenkies shrimp tank substrate.
Container also changed to smaller base footprint.
YouTube Video
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YouTube Video
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Clear waters after few days.

Second tank, use swimming pool filter sand, #20 sieve size.
Much easier, fully fluidised.

15 May 2017 day 1
YouTube Video
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Day 2, May 16
YouTube Video
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Interesting technical resource here.

http://www.sciencedirect.com/science...44860905001184

Design and management of conventional fluidized-sand biofilters

Steven T. Summerfelt ,
The Conservation Fund Freshwater Institute, 1098 Turner Road, Shepherdstown, WV 25443, USA

Available online 19 October 2005.

Abstract
Fluidized-sand beds are an efficient, relatively compact, and cost-competitive technology for removing dissolved wastes from recirculating aquaculture systems, especially in relatively cool or coldwater applications that require maintaining consistently low levels of ammonia and nitrite. This paper describes several types of flow injection mechanisms used in commercial fluidized-sand biofilters and provides criteria for design of flow distribution mechanisms at the bottom of the fluidized bed. This paper also summarizes the most critical aspects of sand selection, as well as methods for calculating or experimentally measuring fluidization velocities and pressure drop for a given filter sand size distribution. Estimates of nitrification rate, ammonia removal efficiency, carbon dioxide production, and oxygen consumption across fluidized-sand biofilters are also provided for various conditions. Fluidized-sand biofilter operational and management practices are also described
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Last edited by Ong88; 19-05-2017 at 11:01 PM.
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Old 19-05-2017, 10:58 PM   #2
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For those interested in getting the swimming pool filter sand for such a project, please contact Ms Goh : 68965701 to pre order .
Office at Toh Guan Centre near IMM .

20kg bags $22-25
Please specify #20 size sand.
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Old 19-05-2017, 11:07 PM   #3
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Water is pumped into the container by pump cannibalized from a dolphin black OHF box set.
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Old 19-05-2017, 11:21 PM   #4
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Tried to set up a moving sand bed filter in sump first compartment, failed. All sand washed into downstream compartments. Flooded floor too

Will try again next week with dedicated container like in-tank set up above.
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Old 20-05-2017, 02:43 AM   #5
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Great and informative post, Im always keen to set up a MSF.
But the risk of sand getting into my the pump is always preventing me from starting one. Have tot of doing it like K1 but with air pump. hahaha, hope to try it out soon during school holidays.
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Old 20-05-2017, 09:00 AM   #6
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If you have no K1 yet, may want to use Perlite instead of K1 : cheap and good.

I get Perlite from this place,
http://www.huahng.com.sg
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Old 20-05-2017, 11:33 AM   #7
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Can use those fluidised reactors for marine?
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Old 20-05-2017, 12:17 PM   #8
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Quote:
Originally Posted by elimmel View Post
Can use those fluidised reactors for marine?
Yes, of course.

Easier and no trial/error.
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Old 20-05-2017, 04:04 PM   #9
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Hmmm... more options always good. Thanks
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Old 23-05-2017, 10:53 AM   #10
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need to cover the top of the container? Do you have full pic of the whole setup?
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