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OfflinePsiliPSIENTIST
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pasteurization question
    #5288745 - 02/11/06 01:39 PM (17 years, 11 months ago)

When pasteurizing wheat straw mixed with cow poo I was just wondering if the temperature reading on the meat thermometer should be read from the middle of the substrate or the water temp? The substrate is about 140 when the water is at 170. I read all the faqs but i didn't notice if any of them answered that question


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InvisibleAndroctonus
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Re: pasteurization question [Re: PsiliPSIENTIST]
    #5288790 - 02/11/06 01:52 PM (17 years, 11 months ago)

You want the center of the Substrate at you target temp. (170), For the duration of the pasteurization process.


--------------------
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An aura comes towards me

Someone's changed the formula
Un-chaining another law

The structures, the colors
Uniform chaos is alternating

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OfflinePsiliPSIENTIST
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Re: pasteurization question [Re: Androctonus]
    #5288821 - 02/11/06 02:02 PM (17 years, 11 months ago)

thanks!


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OfflineRogerRabbitM
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Re: pasteurization question [Re: PsiliPSIENTIST]
    #5288888 - 02/11/06 02:27 PM (17 years, 11 months ago)

However, the center of the substrate should not exceed 150F during the process. Above that leaves straw open to contaminants later because too many of the beneficial bacteria will be killed off.
RR


--------------------
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"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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OfflinePsiliPSIENTIST
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Re: pasteurization question [Re: RogerRabbit]
    #5289049 - 02/11/06 03:35 PM (17 years, 11 months ago)

what about the outer layer of the substrate then? Should it not be exposed to temps over 150?


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Offlinekilgore_trout
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Re: pasteurization question [Re: RogerRabbit]
    #5289094 - 02/11/06 03:52 PM (17 years, 11 months ago)

don't let the water or center of the substrate get above your pasteurization temps. it will take a while for the center to heat up, assuming you are using bags in a water bath. keep the water at pasteurization temp otherwise the outer parts of the substrate will exceed desired temps. once inside hits 140, let it go for like an hour or two.


--------------------
"I didnt fight a secret war in nicaragua so you could walk these streets of freedom bad-mouthing lady america in your damn mirrored sunglasses."


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OfflinePsiliPSIENTIST
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Re: pasteurization question [Re: kilgore_trout]
    #5289134 - 02/11/06 04:01 PM (17 years, 11 months ago)

shit, so if i just let the center get to 170 and stay for an hour is that bad?


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Offlinekilgore_trout
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Re: pasteurization question [Re: PsiliPSIENTIST]
    #5289202 - 02/11/06 04:13 PM (17 years, 11 months ago)

not as bad as 210.


if you've already done it, just be very clean and use a good spawn rate. mix that spwan well too.

if you haven't already done it, do it right.


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"I didnt fight a secret war in nicaragua so you could walk these streets of freedom bad-mouthing lady america in your damn mirrored sunglasses."


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Invisibleagar
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Re: pasteurization question [Re: kilgore_trout]
    #5289664 - 02/11/06 06:48 PM (17 years, 11 months ago)

My humble opinion only.
(h/poo only)

It depends how you do it.
Pot full of water with h/poo & no bag.
Bag of h/poo in pot of water.

I prefer the bag method.

(pot full of h/poo = bottom gets to hot)

Best way is bags, with a two (2) thermometers.

A candy thermometer in the pot of water.
A meat thermometer inserted in the bag.

That way you can tell both outside the bag water temps.
And, center of the substrate.

Water temp @ 160 -165 F.
Internal temp @ 150 F.

(if ever the internal temp starts to raise to high, remove bag.
Allow water to cool, then return bag)

The lower temps are MUCH SAFER.
(NEVER - exceed 170F internal temp)

With lower temps, 150/155F pasteurize longer (several hours).
With higher temps, (near 170F) pasteurize a shorter time
(1 hour after core is up to temp)


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InvisibleRahz
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Re: pasteurization question [Re: agar]
    #5290053 - 02/11/06 08:50 PM (17 years, 11 months ago)

Just wanted some clarity on bags. It seems the bags being discussed are not pillowcases, or other porus bag.

I was just wondering, is it better to use a non porus bag so that nothing leaches out? Or is it about the same either way?

Also, I've lowered my temps to 150 after hearing you and RR mention 140 several times lately. I'm using a pillow case, and measuring with a meat thermometer in the water, outside the case, next to the edge of the pot, maintaining temp for 2 hours. Does this sound ideal?

Rahz


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rahz

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OfflineRogerRabbitM
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Re: pasteurization question [Re: Rahz]
    #5290093 - 02/11/06 09:17 PM (17 years, 11 months ago)

No more than 2 hours, but an hour AT the 140 to 150 should be enough. There's lots of ways to do it, so figure out one that works for you. My main point earlier was to keep the temperature down. There is a tendency when starting out in the hobby to think that hotter is better, but that's not the case with pasteurization.
RR


--------------------
Download Let's Grow Mushrooms



semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
Thomas Edison


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OfflineJSshroom
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Re: pasteurization question [Re: RogerRabbit]
    #5292670 - 02/12/06 08:34 PM (17 years, 11 months ago)

hmmm. i use the agar bag method and I ended up cooking mine forever. I was under the impression you started the 90-120min countdown when internal temps hit 160F so your saying i can start at 150f or 140f. would save a bunch of time


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