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

From: Robert Norsen <bnbrew_at_yahoo.com>
Date: Thu, 9 Oct 2003 19:46:27 -0700 (PDT)

Over and over. Had a problem getting them to agree exactly so settled for very close. Off a couole of 10ths. The diffeences at result time were more like 4.0 + -

David Loring <dloring3_at_cox.net> wrote:Bob - Did you check both the zero and free air calibration on your DO meters?
 
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 clarify 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 compost quantities and nutrient loads to where Air and D O2 would not become a factor

 

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 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 during 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 Berlin, 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 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 barometric pressure from one day to the next would account for changes in tea Oxygen levels of more than about 0.5-1.0ppm? The second part of the question 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 was only 11.1 to 11.4ppm from extreme low to high. So I don't understand what the concern is about varying barometric pressure unless you're in a hurricane?? It seems likely that it only accounts for a small percentage of the 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 variations, but I do think there could be a lot of significant information teased out of the data if all the conditions of the test were known. For instance, if the amount of compost added was small so that the lag time to maximum Oxygen demand was more than 10-12 hours then I wouldn't look to the compost materials to be significantly different given they were from the same 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 bacteria competed from the very start. I expect the answer lies in air flow, either 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, but maybe enough to make a difference if the demand due to high sugar additions was high. If th
 e air
 pumps used were of the cheap variety then their output 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





To unsubscribe from this group, send an email to:
compost_tea-unsubscribe_at_yahoogroups.com



Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


To unsubscribe from this group, send an email to:
compost_tea-unsubscribe_at_yahoogroups.com



Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


To unsubscribe from this group, send an email to:
compost_tea-unsubscribe_at_yahoogroups.com



Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

Yahoo! Groups SponsorADVERTISEMENT

To unsubscribe from this group, send an email to:
compost_tea-unsubscribe_at_yahoogroups.com



Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.





Received on Thu Oct 09 2003 - 23:20:25 EDT

This archive was generated by hypermail 2.3.0 : Tue Feb 07 2012 - 14:14:49 EST