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How do we clean the active bone dust in the mesh

05/21/2008 10:18 PM

We are supply air treatment equipment for varies industries, but we met a bit trouble during the active carbon cleaning working. let me simply introduce our equipment working theory. we adopted big tank for air treatment, waste air come in from the bottom of the tank, and after treatment the air exhaust from the top side in the tank. we were setting 3 layers filters inside the tank which air go throught the mesh for air purify purpose. the active carbon storage in the tank for waste air particle absorbing, as long time processed, the active carbon dust will be collect and coher inside the mesh, we connect the hot steam and clean the mesh periodic, but it's not able cleaning completely and remain strong residue still in the mesh, as long time equipment operaiton, we have to pull out the mesh and cleaning by manually, we are very appreciate if someone could propose me new way for the active carbon cleaning inside the tank.

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#1

Re: How do we clean the active bone dust in the mesh

05/21/2008 10:49 PM

Try washing it with alcohol first before applying the steam. Alcohol will dissolve away the oil that enables the dust to stick to the carbon. It also has very poor adhesion to activated carbon. Finally, have you considered placing a fabric filter layer before the carbon filter layer? This will help to trap the dust before it reaches the carbon layer.

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#2
In reply to #1

Re: How do we clean the active bone dust in the mesh

05/21/2008 11:14 PM

My freind;

Thank you so much for your timing response, but can we try to cleaning the mesh automatically? the alcohol is perfect agent for the active carbon cleaning, but if it apply in automatically cleaning that it seem like unfeasible, as I know the alcohol is dangerous while it's working under high temperature condition. in manualy the alcohol is good ways in cleaning.

we have placing a fabric layer before the carbon filter layer, thanks for your value comments.

Sincerely regards

Pory

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#3
In reply to #2

Re: How do we clean the active bone dust in the mesh

05/23/2008 1:04 AM

You can try using a hot soap water of detergent solution instead of alcohol. I don't know what type may be suitable as different types of activated carbon may or may not adsorb them. If you can find a suitable detergent, spray it on, then rinse it off with hot water before applying hot dry air to dry it. Finally, apply steam to remove loosened particles.

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#5
In reply to #3

Re: How do we clean the active bone dust in the mesh

05/23/2008 3:00 AM

Thank you for your value suggestion, I think some solve agent is suitbale for the strong residue cleaning, but it's property shold be mildness since it apply for the hot temperature working condition, I have to ask chemical expert for sugesstion as well. After I got the information, if you like I can share with you for chemcial expert opinions.

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#4

Re: How do we clean the active bone dust in the mesh

05/23/2008 1:47 AM

I assume you are using Activated Carbon to trap VOCs. The fact that you are using steam to regenerate AC it means whatever you are trapping is volatile in nature. But then you defeat the purpose of trapping VOCs or whatever you trap. If that is the case you should install an incinerator after that.

Nevertheless if such matter again condense on the mesh by increasing temperature of steam or steam flow rate you should be able to release the matter from the mesh. May be to have a steam tracing line near the mesh will help.

If your concern is the AC dust created by physical abrasion in use and steam reactivation, perhaps you should really look at the source of carbon.

By the way I am an engineer with over 25years experience in AC and its applications!

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#6
In reply to #4

Re: How do we clean the active bone dust in the mesh

05/23/2008 3:27 AM

Thank you so much for your specialist comments, definitely we using AC to trap VOCs and steam to regenerate AC. after a period the active carbon trap the harmful particle in air, the steam generator will switch on automatically since it's sense the exhaust air pressure have increasingly to seting scope(more and more AC adhesive to the mesh and the filled mesh stand to air outlet), afterwards the active carbon regenerate by steam and it's will release the harmful particle with fluid water and drain to waste water tank, it can reach to waste air treatment aftermath.

Actually we seting the steam nearby the mesh have closed as possible, but only steam cleaning that it's not enough to cleaning residue completely, particular the machine after 1 years opeation, and the residue matters get serious, so far we only pull the mesh outside cleaning by manually , it's not good ways, we are prefer to search some solve agent can cleaning the active carbon residue which it activity in steam. so could you advice me what kind the chemicaly is suitable for the strong active carbon cleaning purpose?

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#7
In reply to #6

Re: How do we clean the active bone dust in the mesh

05/23/2008 6:30 AM

AC is not so expensive...specially in China.

Actually what you are doing is not the technically correct thing. You collect VOCs and then release them to atmosphere in concentrated batches when you use steam to regenerate.

My advice to you is do not regenerate AC in VOC application but use spent carbon to a landfill or an incinerator (whatever is allowed by your country's enviro authority). Please do not misunderstand my comment as being partial because we also are a manufacturer.

In my life I always TRY to be as gentle as possible to the environment (which of course is no easy task)

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#8

Re: How do we clean the active bone dust in the mesh

05/23/2008 9:33 AM

I agree with Sisira on this issue. I am an engineer working in the field of odour control. We use activated carbon as a "polishing" agent generally after biological treatment, because of its ability to adsorb mercaptans, VOC's and DMS. When the carbon is "saturated", ie can no longer adsorb any more odour we replace it with fresh AC and the saturated product is sent to landfill or incinerated. I agree also with Sisira that there is nothing to be gained in steam cleaning the AC as you immediately return the captured VOC's etc back to the environment.

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#9

Re: How do we clean the active bone dust in the mesh

05/23/2008 1:16 PM

What I have seen in use of Activated Carbon is that there is a pre-filter before the activated Carbon to trap the larger particles.

In Liquids a Sand Filter often is installed before the AC filter

With Air I envision A series of Air filters (Cartyridge type) that you can replace. The cloth concept is very interestiong and I wonder if you could use a Vortex type system that precipitates solid particles for collection ...then use a series of progressively

Finer Air (cartridge filters- Like the ones used for Air Conditioning unites, or similar)

The you would send the Cleaned Air without particles to the Activated Carbon

Tank. I thin this would make the AC last longer before replacing.

You can set up a similar Vortex system at the exit of the Activated Carbon Tank to collect AC dust before the Mesh that you want to clean ...

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#10
In reply to #9

Re: How do we clean the active bone dust in the mesh

05/24/2008 1:54 AM

If gas stream contains dust particles, a prefilter is used for particle filtration and it in most instances can be taken out and cleaned by washing/compressed air. After filtering out the particles present in gas stream it is sent through the AC bed to remove VOCs etc.

AC is not used to filter out particles, large or small.

If AC dust is created in the process then either you are creating too much turbulence in the AC bed or using a structurally weak carbon.

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#11

Re: How do we clean the active bone dust in the mesh

05/24/2008 2:56 AM

We specialise in biological odour treatment and generally use a biotrickling filter prior to the AC. This system has the added advantage of removing all of the dust from the air stream in addition to the biological process that metabolises virtually all of the hydrogen sulphide in the gas stream. We use a specific bacteria in that process, but I wonder also if another specific bacteria could also be beneficial to metabolise the bone dust you mentioned. If that indeed is a biological product itself, it should be capable of being metabolised in this process.

A biotrickling filter is a tank that has a sump at the bottom and a media stack on top of grating. In practice bacterial solution is recirculated from the sump to the top of the media bed where it then trickles down and back into the sump. Waste air is drawn countercurrent through the media bed and the waste products in it, including dust, are metabolised or flushed into the sump.

Although requiring an additional tank, you will find that this process will save you many hours trying to clean your AC, which is a rather pointless task.

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#12
In reply to #11

Re: How do we clean the active bone dust in the mesh

05/25/2008 11:40 PM

Hi,Mr.Pete:

I am much appreicate for your valume comments, we are specialise in painting equipment field, actually our business focus on painting and surface treatment device research, although waste air treatment is our subordinate business, but nowdays more and more request us to provide relevant equipment with painting equipment, as I know you are professional bilogical odour treatment device supplier, could you advice me your detail proposal for the biotrickling fiter? we are very appreicate if you can share your oponions and brief sketch drawing for filter tank description.

Detail about our business, welcome you visit my company website for detial,www.fungyu.com.hk

Sincerely regards

Pory Pang

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#13
In reply to #12

Re: How do we clean the active bone dust in the mesh

06/02/2008 8:57 AM

Have you investigated photocatalytic process to eliminate the organic compounds? This will not help with the particualte content, but it will break down the compounds and render them harmless in many cases.

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#14
In reply to #13

Re: How do we clean the active bone dust in the mesh

06/02/2008 7:50 PM

No we haven't used that technique. How does it work?

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