RE: [compost_tea] Re: barometric pressure and compost tea Oxygen levels

From: TaChung Huang <tachung_h_at_yahoo.com>
Date: Fri, 10 Oct 2003 12:55:17 +0800

Bob:
Thanks for posting your testing results.
Your numbers actually reveal some consistency that the air pump to your fir=
st brewer is not "identical" to the other two. The DO of the first brewer i=
s consistently lower, in test 1 and 3, when fish was used. Fish has more N=
 then Kelp does, I suppose. The third brewer was also producing less air th=
en the second one and it became evident when the fish was used.
 
 



Regards
TaChung Huang (黃大忠)

-----Original Message-----
From: Robert Norsen [mailto:bnbrew_at_yahoo.com]
Sent: Friday, October 10, 2003 5:00 AM
To: compost_tea_at_yahoogroups.com
Subject: Re: [compost_tea] Re: barometric pressure and compost tea Oxygen l=
evels



Dave, Tom Kirk and All

 

Much conjecture about the 9 test series Kevin and I did at SFI. Let me cla=
rify the objectives and methods and touch on results.

 

Our objective was

1 to compare 3 types compost, GU wood based, AK Humus, and North Country O=
ranics,

   each in normal as composted and activated by oat flour.
2 to compare fish with kelp.

Many more objectives would have been of interest but we steeled ourselves t=
o what we expected to be able to accomplish. Our plan was to hold compost =
quantities and nutrient loads to where Air and D O2 would not become a fact=
or

 

We started with

3 identical new Bitti brewers,

3 new identical pumps,

3 identical 10 gallon 'tanks'

fish

kelp

3 different compost types ( Ground up based on wood)

                                      ( AK Humus )

                                      ( North Country Compost as was used b=
y Paul Sachs)

3 identical D O2 meters calibrated and cross calibrated small adjustments =
recorded.

  3 meter probes were hung to get equally agitated water during the brew.

 

3 brewers were set up side by side, turned on and off by a single switch.

 

SFI Tap water was drawn in 5 gallon lots, each split between 3 brewers to =
get equal conditions, temps. Temp 77F at start. temp Dropped equally duri=
ng brew.

 

Test 1 3 equal 4 cups of compost added each brewer, GU, AH, NCO

            3 equal amounts fish ( 80 ml fish ) in each brew.

 

Test 2 same equal amounts, same compost, 80 ml kelp.

 

Test 3 Same equal amounts ACTIVATED compost , 80 ml fish.

 

O2 readings on

                        Test 1 fish The max readings 7.6 , 7.1, 7.8=
 

                                                 Min 3.3=
     7.0 5.7

 

                         Test 2 Kelp Max 8.6 8.=
1 8.6

                                                 Min 8.=
1 6.8 7.7

                         Test 3 fish. Activated compost

                                                 Max 7.8=
      7.5 7.9

                                                 Min 2.=
3 6.8 5.4

 

Test results - The highest TF was from test 3, GU compost at 5.8 ug/ml

Excellent TB on all samples. TF varied none exceptional

That 2.3, Kirk, is why I was elling? IT TAKES MORE THAN O=
RMAL?AIR

to meet O2 needs of the unusual activity that can occur outside of plans. =
 

 

 

It reminds be of when I was asked how much fuel a formation headed for Berl=
in, 10 hour mission, should take, our records showed the B-24 flying in the=
 same formation used from 250 GPH to 450GPH. Those that used more crashed o=
ut of gas on prior missions to Berlin.

 

What other answer could I (yell) ?ALL THEY CAN HOLD !

Bob
 
David Loring <dloring3_at_cox.net> wrote:

Tom - Thanks, that table is great. If you had that why do you say barometr=
ic pressure from one day to the next would account for changes in tea Oxyge=
n levels of more than about 0.5-1.0ppm? The second part of the question ha=
s to deal with how much the barometric pressure changes from day to day. =
 
 
I plugged in the numbers from the extreme low and high isobar map lines for=
 the entire United States again and and the range of dissolved Oxygen was o=
nly 11.1 to 11.4ppm from extreme low to high. So I don't understand what t=
he concern is about varying barometric pressure unless you're in a hurrican=
e?? It seems likely that it only accounts for a small percentage of the va=
riation in Robert Norsen's test results.
 
I think Roberts results are probably not caused by sampling errors (he seem=
s to be familiar with the use of his DO probe) or barometric pressure varia=
tions, but I do think there could be a lot of significant information tease=
d out of the data if all the conditions of the test were known. For instan=
ce, if the amount of compost added was small so that the lag time to maximu=
m Oxygen demand was more than 10-12 hours then I wouldn't look to the compo=
st materials to be significantly different given they were from the same ba=
tch. If the starting materials added were large, say more than 4oz per 5 g=
als. then it is more likely to make a difference in the way the bacteria co=
mpeted from the very start. I expect the answer lies in air flow, either f=
rom worn air pumps or older diffusers, if such were used. The diffuser in =
my Sotillo tank seems to have changed over the last year, not a lot, but ma=
ybe enough to make a difference if the demand due to high sugar additions w=
as high. If the air pumps used were of the cheap variety then their output=
 may have varied widely.
 
Dave

----- Original Message -----
From: tomjasz <mailto:tom_at_livesoil.com>
To: compost_tea_at_yahoogroups.com
Sent: Wednesday, October 08, 2003 7:13 PM
Subject: [compost_tea] Re: barometric pressure and compost tea Oxygen level=
s

--- In compost_tea_at_yahoogroups.com, "David Loring" <dloring3_at_c...>
wrote:
> Stop making me do so much math :-} >
> Dave



OK,
http://water.usgs.gov/software/dotables.html





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Received on Fri Oct 10 2003 - 08:25:52 EDT

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