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InvisibleOzzy
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Steam pasteurizing straw
    #14087448 - 03/08/11 03:50 PM (12 years, 10 months ago)

So I get asked this question alot through Pm's about it due to my  live steam box
and unfortunately I have no experience with the answer short of  having heard arguments for both cases. If someone can definitively answer this question it would be much appreciated. Thanks


Can straw be steam pasteurized in this doohickey without partially sterilizing?


Edited by Ozzy (03/10/11 08:00 AM)


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Offlinemycobeginner
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Re: Steam pasteurizing straw [Re: Ozzy]
    #14095453 - 03/09/11 10:34 PM (12 years, 10 months ago)

That should work, have u tried it and get it to 165-175f?


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OfflineRogerRabbitM
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Re: Steam pasteurizing straw [Re: mycobeginner]
    #14095877 - 03/10/11 12:04 AM (12 years, 10 months ago)

Good question.  It certainly seems that the straw near the steam inlet is going to be much hotter.

I saw something on that link about 3 or 4 psi.  Tell me that's not in a plastic tote.  I don't even run my steel drums that high.  I'm tired, so must have misread.
RR


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InvisibleOzzy
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Re: Steam pasteurizing straw [Re: RogerRabbit]
    #14096455 - 03/10/11 05:54 AM (12 years, 10 months ago)

No ,the tote dosen't pressurize at all, the Pc does come up to usually 3 lbs of pressure though. Should I be concerned about that? I have literaly used it at least 100 times like this and never had a problem. If you feel this is unsafe for some reason, I will delete the tec. I wouldn't want any one hurt.


Edited by Ozzy (03/10/11 07:22 AM)


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Offlinehamloaf
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Re: Steam pasteurizing straw [Re: Ozzy]
    #14096499 - 03/10/11 06:38 AM (12 years, 10 months ago)

Quote:

Ozzy said:
So I get asked this question alot through Pm's about it due to my  live steam box
and unfortunately I have no experience with the answer short of  having heard arguments for both cases. If someone can definitively answer this question it would be much appreciated. Thanks


Can straw be steam pasteurized in this doohickey without partially sterilizing?



Ozzy, this is one I'd say you'r going to have to try a few times to see if it works before you try to "patent the idea".  Working out the kinks and bugs along the way. 

I don't see any reason why straw would not become properly pasteurized so long as proper pasteurization temperatures and time lines were followed, making sure the straw does not exceed or drop below 130-160F for an hour and a half.


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Re: Steam pasteurizing straw [Re: Ozzy]
    #14096511 - 03/10/11 06:46 AM (12 years, 10 months ago)

The 3psi is just the load imposed by the constriction of the tubing and its orifices. As long as the pathway from the PC into the chamber is not obstructed no dangerous pressures should develop. 3psi literally represents the pressure differential that is visible when steam moves from the PC into the tub. You would achieve considerably higher pressure to put your mouth on one end and lightly blow with the other end of the tubing still being open.

I am most certainly interested to know if anyone succeeds in bulk pasteurization of straw using this apparatus. I would build it for that purpose if it proves successful. I'm not inclined to build it strictly to see if ti works or not.


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Re: Steam pasteurizing straw [Re: debianlinux]
    #14096571 - 03/10/11 07:27 AM (12 years, 10 months ago)

Quote:

hamloaf said:
Ozzy, this is one I'd say you'r going to have to try a few times to see if it works before you try to "patent the idea".  Working out the kinks and bugs along the way. 

I don't see any reason why straw would not become properly pasteurized so long as proper pasteurization temperatures and time lines were followed, making sure the straw does not exceed or drop below 130-160F for an hour and a half.




The idea wasn't mine to begin with, I'm just trying to track down an answer without having to test it out, as for the moment it will still be a couple of months before I decide to try straw again, due to whether and space issues.
the argument against it for straw as rr said is that the straw near the inlet would be much hotter than anywhere else. I have read somewhere that there is a special valve that one could use to insure that only the correct temps enter the tub. I have not been able to track down said valve as I do not know what the name of it is.

Quote:

debianlinux said:
The 3psi is just the load imposed by the constriction of the tubing and its orifices. As long as the pathway from the PC into the chamber is not obstructed no dangerous pressures should develop. 3psi literally represents the pressure differential that is visible when steam moves from the PC into the tub. You would achieve considerably higher pressure to put your mouth on one end and lightly blow with the other end of the tubing still being open.

I am most certainly interested to know if anyone succeeds in bulk pasteurization of straw using this apparatus. I would build it for that purpose if it proves successful. I'm not inclined to build it strictly to see if ti works or not.




That was my understanding when I built it and it first came up to pressure. Thanks for the reassurance.

EDIT: I changed the wording in the tec using a quote from you debianlinux, I hope you don't mind, but keeping the hose clear is a critical safety feature. Thanks for the clear explaination of it.
Also added that the PC comes to pressure, not the tote. Thanks RR.:awethumb:


Edited by Ozzy (03/10/11 07:53 AM)


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Offlinechucklehead
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Re: Steam pasteurizing straw [Re: Ozzy]
    #17780630 - 02/10/13 10:39 PM (10 years, 11 months ago)

I have searched for several hours on this subject and can't get a clear answer.  I saw several people mention that they were going to try it but never came back to say it worked.  I guess I will just have to give it a go myself. 

If anyone is using bulk steam pasteurizers for straw out there please post back on this thread to mention that it works for you.  Also if there is a trick to it that would be awesome to know.

Thank you.
C.H.


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Re: Steam pasteurizing straw [Re: chucklehead]
    #17781367 - 02/11/13 02:04 AM (10 years, 11 months ago)

Yes I do. I posted about it here

Since then I have updated the controls so there are 2 x thermostats, one for the internal temperature and one about 1" in from the outside, as the once the internal temp starts to rise it rises very quickly and overshoots the mark considerably.

I also ditched the home made electric steam gen for a 7Kw Sauna unit.


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Edited by solarity (02/11/13 02:09 AM)


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Re: Steam pasteurizing straw [Re: solarity]
    #17781639 - 02/11/13 05:51 AM (10 years, 11 months ago)

works fine but requires separate soak so I boil now.  I used a 96 gallon tote with two stacking flower crates inside.  Powered by a Jiffy garment steamer.  Still use it for casing and compost.


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Re: Steam pasteurizing straw [Re: solarity]
    #17785834 - 02/11/13 08:46 PM (10 years, 11 months ago)

Quote:

solarity said:
Yes I do. I posted about it here

Since then I have updated the controls so there are 2 x thermostats, one for the internal temperature and one about 1" in from the outside, as the once the internal temp starts to rise it rises very quickly and overshoots the mark considerably.

I also ditched the home made electric steam gen for a 7Kw Sauna unit.





Thank you. 

Correct me if I misunderstood.  Are you saying the trick to steam pasteurizing straw is to monitor the internal temperature of the bags just an inch from the surface of the bag, then use that near surface temp of the substrate to regulate the steamer box?

Thanks again.


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Invisiblesolarity
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Re: Steam pasteurizing straw [Re: chucklehead]
    #17787818 - 02/12/13 06:58 AM (10 years, 11 months ago)

I use the bag sub surface temp to regulate the steam box temp and the central temp to start the timer.
Everything is automated so I throw in straw and fill with water+lime in the morning, then open the drain tap just before I leave. The steamer runs overnight because of the cheaper electricity.
This is an example of the temperature profile at those two locations - I tweaked it to fix the overshoot of the centre of the bag (Blue) but you can see what I mean this is with the subsurface temp is cut off at 65C. Once the internal temp starts to rise it is almost too late!



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Offlinechucklehead
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Re: Steam pasteurizing straw [Re: solarity]
    #17791896 - 02/12/13 08:01 PM (10 years, 11 months ago)

Thank you.  That is exactly what I wanted to know.  This is very helpful.    5:mushroom2: to you.

Also your set up sounds really awesome.  :rockon:


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Invisiblesolarity
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Re: Steam pasteurizing straw [Re: chucklehead]
    #17793641 - 02/13/13 02:34 AM (10 years, 11 months ago)

Thanks, glad to help.


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