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OfflineMFGFA37
Me For God ForAll
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Registered: 09/08/07
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On Pasteurization...
    #7527113 - 10/17/07 10:19 AM (16 years, 3 months ago)

I have heard of people pasteurizing by dumping a few gallons of 180ºF water into a cooler/trash can with their bulk substrate. Does this give reliable results with ya'lls experience? If so, that seems much easier than other methods.

I am going to be doing a few mono-tubs using MonsterMitchs' tek. Hoping to find a more efficient and reliable method, the above is what I came upon. Thanks for the input!


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There is no try, only do. -Yoda-

Take no thought for tomorrow, tomorrow shall take thought for itself. Sufficient for one day are the thoughts/worries for that day. Any thought past this is useless. -Ole Jesus-


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InvisibleHippie3
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Re: On Pasteurization... [Re: MFGFA37]
    #7527226 - 10/17/07 10:56 AM (16 years, 3 months ago)

works ok on poo but less so on straw,
i like using an electric wallpaper steamer to
blow hot steam into a barrel/cooler to maintain
a core temp of 140-145*F for at least 4-6 hours
esp. if any straw is in the mix


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OfflineMFGFA37
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Re: On Pasteurization... [Re: Hippie3]
    #7527238 - 10/17/07 11:00 AM (16 years, 3 months ago)

140-145º? Thats pretty low for pasteurization isn't it?


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There is no try, only do. -Yoda-

Take no thought for tomorrow, tomorrow shall take thought for itself. Sufficient for one day are the thoughts/worries for that day. Any thought past this is useless. -Ole Jesus-


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Invisiblemycocurious
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Re: On Pasteurization... [Re: MFGFA37]
    #7527342 - 10/17/07 11:34 AM (16 years, 3 months ago)

My bulk steam pasteurizer requires two of the wagner power steamer/wallpaper removers to power it because of it's large size.

However, the average core temperature inside the unit is generally in the 160-180(F) range. You need it at least this warm inside the box if you're going to penetrate the core of your substrate - however you've got it bagged up - with a temperature somewhere in the 140-160(F) range.

This is where most people's makeshift pasteurization methods fail because they don't take into account that the center of the substrate needs to reach 140-160(F) for an hour and in order to do so, it has to absorb the heat from _somewhere_. Not only do soak/water techs totally destroy your ability to set the moisture content *before* - not to mention they leach out a lot of nutrients in the process - but they also fail to realize that if the substrate is only 76(F) and you dunk it in 180(F) the first thing it's going to do is cause the temp of the water to plummet up to 40-60(F) as it equalizes the temperature.

With steam pasteurization methods (with RR's method being my favorite for small quantities) you save yourself all those hassles and as long as you do a test run or two to make sure that your core is reaching the require temp range you're good to go. It's the consistency and the repeatability of the results that really sold me over.

I know, for a given amount of substrate, precisely how long it will take from the moment I turn it on until I should begin timing out an hour and from there, I just set it and forget it...




Of course, it cost me at least $200 to build the damn thing all things said and done, but the nice thing is that I can use it to do bulky things - like the branches my iguana climbs on in his cage to kill the mites / etc...


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:justdontknow: Don't mistake my tone for a "matter-of-fact" attitude.  I'm just presenting what I believe to be correct, until I'm corrected...

- How Myco-Curious Prepares Coir & Compost Substrates
- How Myco-Curious Builds A Bulk Humidifier
- How Myco-Curious Builds An Automated Greenhouse
------------------------------------
figgusfiddus said:
Keep in mind that inoculating or whatever in front of a flow hood won't help your bad substrate, your bad inoculant, your bad sterile procedure, etc. etc. etc. It's not a +3 flowhood of magic, it's just a tool.


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OfflineMFGFA37
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Re: On Pasteurization... [Re: mycocurious]
    #7527484 - 10/17/07 12:11 PM (16 years, 3 months ago)

I see. Do you have a tek written for your device, or have you just built it and called it at that? I am a little confused... you said,

"...This is where most people's makeshift pasteurization methods fail because they don't take into account that the center of the substrate needs to reach 140-160(F) for an hour..."

I thought, from my research; that the temp necessary is 170F. So if core temps reach 140F for the alotted time, then the process is considered complete? I am going to get back on that search button.


--------------------
There is no try, only do. -Yoda-

Take no thought for tomorrow, tomorrow shall take thought for itself. Sufficient for one day are the thoughts/worries for that day. Any thought past this is useless. -Ole Jesus-


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OfflineRogerRabbitM
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Re: On Pasteurization... [Re: MFGFA37]
    #7527714 - 10/17/07 01:11 PM (16 years, 3 months ago)

Anything over 140F works. Consider 170F the maximum you'd want to go. Above that, you're partially sterilizing.
RR


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