Robert - I'd like to send you an analysis of your data off list.
Dave
----- Original Message -----
From: Robert Norsen
To: compost_tea_at_yahoogroups.com
Sent: Thursday, October 09, 2003 2:00 PM
Subject: Re: [compost_tea] Re: barometric pressure and compost tea Oxygen=
levels
Dave, Tom Kirk and All
Much conjecture about the 9 test series Kevin and I did at SFI. Let me c=
larify 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=
Oranics,
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=
to what we expected to be able to accomplish. Our plan was to hold compos=
t quantities and nutrient loads to where Air and D O2 would not become a fa=
ctor
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=
by Paul Sachs)
3 identical D O2 meters calibrated and cross calibrated small adjustment=
s 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 t=
o get equal conditions, temps. Temp 77F at start. temp Dropped equally du=
ring 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 "yelling", IT TAKES MORE THAN 'NORMAL' 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 Be=
rlin, 10 hour mission, should take, our records showed the B-24 flying in t=
he same formation used from 250 GPH to 450GPH. Those that used more crashed=
out 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 baro=
metric pressure from one day to the next would account for changes in tea O=
xygen levels of more than about 0.5-1.0ppm? The second part of the questio=
n has 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 w=
as only 11.1 to 11.4ppm from extreme low to high. So I don't understand wh=
at the concern is about varying barometric pressure unless you're in a hurr=
icane?? It seems likely that it only accounts for a small percentage of th=
e variation in Robert Norsen's test results.
I think Roberts results are probably not caused by sampling errors (he =
seems to be familiar with the use of his DO probe) or barometric pressure v=
ariations, but I do think there could be a lot of significant information t=
eased out of the data if all the conditions of the test were known. For in=
stance, if the amount of compost added was small so that the lag time to ma=
ximum Oxygen demand was more than 10-12 hours then I wouldn't look to the c=
ompost materials to be significantly different given they were from the sam=
e batch. If the starting materials added were large, say more than 4oz per=
5 gals. then it is more likely to make a difference in the way the bacteri=
a competed from the very start. I expect the answer lies in air flow, eith=
er from 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, bu=
t maybe enough to make a difference if the demand due to high sugar additio=
ns was high. If the air pumps used were of the cheap variety then their ou=
tput may have varied widely.
Dave
----- Original Message -----
From: tomjasz
To: compost_tea_at_yahoogroups.com
Sent: Wednesday, October 08, 2003 7:13 PM
Subject: [compost_tea] Re: barometric pressure and compost tea Oxygen=
levels
--- 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 - 00:32:22 EDT