Minggu, 07 Februari 2016

Reactivation of Activated Carbon



On Saturday, February 6, 2016 3:31 AM, "Leland Lai lelandlai@aquafauna.com [shrimp]" <shrimp@yahoogroups.com> wrote:


 
Sorry, second sentence supposed to read "finfish" not finish.

From: shrimp@yahoogroups.com [mailto:shrimp@yahoogroups.com]
Sent: Friday, February 05, 2016 12:30 PM
To: shrimp@yahoogroups.com
Subject: RE: [shrimp] Cleaning Activated Carbon



So, the price vs through put water quality will always be debatable since everyone is cost conscious. Most of you are using Bitumuminous coal base carbon. Some (especially the finish people are using coconut shell carbon, which costs a little more per kg. (assuming decent quality
Manufacturer for new product:

Differences: Bitumumious Coconut Shell

Activity (ASTM 3467: 60 CTC 60 CTC
Particle size: 4 x 8 US Mesh 4 x 8 US Mesh
Apparent Density (ASTM 2864): 0.48-0.49 gm/cc 0,49-0.52 gm/cc
Speicific Surface Area
(N2 Bet Method): 900 m2/gm 1050-1100 m2/gm
ASH Content (ASTM 2866): 12% max 3% max
Abrasion Number: 78 Min. 85 Min.
Hardness (ASTM 3802): 95% Min. 99%
Moisture (ASTM 2667): 5% Max. 2% Max.
Bulk Density: 28 lb/ft3 28 lb/ft3

There is about a 20% difference in the surface area and poricity. Most of you are seeking lowest cost for peace of mind. I don't know how you judge this as there are many more parameters other than activated carbon that goes into the "formula" for performance of seed output.
If it works for you, don't screw with it since the cost of carbon is relatively cheap in the total realm of water quality. It still might be considered (regardless of form) a water polishing issue in hatchery philosophies.

From: shrimp@yahoogroups.com [mailto:shrimp@yahoogroups.com]
Sent: Friday, February 05, 2016 11:50 AM
To: shrimp@yahoogroups.com
Subject: Re: [shrimp] Cleaning Activated Carbon


The iodine number is a relative indicator of porosity in an activated carbon. It does not necessarily provide a measure of the carbon's ability to absorb other species. Iodine number may be used as an approximation of surface area for some types of activated carbons (see Test Method C819). However, it must be realized that any relationship between surface area and iodine number cannot be generalized. It varies with changes in carbon raw material, processing conditions, and pore volume distribution (see Definitions D2652).

________________________________
From: "jeff prochaska jeffepro@hotmail.com [shrimp]" <shrimp@yahoogroups.com>
To: "shrimp@yahoogroups.com" <shrimp@yahoogroups.com>
Sent: Friday, 5 February 2016, 11:43
Subject: Re: [shrimp] Cleaning Activated Carbon


Agreed. I'm not advocating skimping on or half-assing water treatment :-)

I assume a lot of hatcheries attempt to clean the activated carbon, with ineffective results, and probably not knowing if it's working. My question was, whether anybody has had success cleaning and reactivating it effectively, without specialized facilities or equipment.

The colorimetric iodine test mentioned by Jaime would at least give some confidence determining whether the cleaning is effective or not, or when the AC is old and needs to be replaced.

Thanks again
--
Best Regards,

Jeff Prochaska



Juan Aguirre jxaguirre58@yahoo.com [shrimp]<mailto:shrimp@yahoogroups.com>
Friday, February 05, 2016 11:00 AM

Act. Charcoal costs 20 - 1 $ kg in alibaba...that should give you an idea of world pricing

why go to the trouble and have a half assed result?

i don't remember prices in Ecuador but it wasn't that expensive..now if you are in a remote location, that might justify it



________________________________
From: "jeff prochaska jeffepro@hotmail.com<mailto:jeffepro@hotmail.com> [shrimp]" <shrimp@yahoogroups.com><mailto:shrimp@yahoogroups.com>
To: "shrimp@yahoogroups.com"<mailto:shrimp@yahoogroups.com> <shrimp@yahoogroups.com><mailto:shrimp@yahoogroups.com>
Sent: Friday, 5 February 2016, 9:33
Subject: Re: [shrimp] Cleaning Activated Carbon


John,

Just curious if you can remember any specs for the steam cleaner? I see a fairly wide range of portable steam cleaners, from a thousand to several thousand dollars.

Thanks
--
Best Regards,

Jeff Prochaska



jeff prochaska jeffepro@hotmail.com [shrimp]<mailto:shrimp@yahoogroups.com>
Friday, February 05, 2016 9:33 AM

John,

Just curious if you can remember any specs for the steam cleaner? I see a fairly wide range of portable steam cleaners, from a thousand to several thousand dollars.

Thanks







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Posted by: Leland Lai <lelandlai@aquafauna.com>
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