Great analysis Jake!
$23k to $33K savings per winter. Nice…
Andy Peters
City of Molalla
Public Works Operations Supervisor
(503) 829-6855 x220
Cell: 503-793-0507
117 N Molalla Ave
Molalla, OR 97038
From: Jake Ehredt <jehredt@cityofmolalla.com>
Sent: Wednesday, November 14, 2018 9:02 AM
To: Andy Peters <apeters@cityofmolalla.com>
Cc: Gerald Fisher <gfisher@cityofmolalla.com>
Subject: RE: DMS Vitamin C.
Andy,
It takes 1-55lbs box of Vitamin C ( Ascorbic Acid) to 1 foot of water. 1 Foot of water in the day tank is equivalent to 111.6 gals or 9.3 gallons per in. This make the concentration approximately 2.5 ppm Ascorbic acid to neutralize 1 ppm Chlorine.
The current price of Vit.C as of 11-13-2018 is $4.48Lb/ 55Lbs box = $246.40/ Pallet = $8870.40
When we started up, we were using approximately 3 feet a day which equal 3 Boxes Ascorbic acid. $739.00( current price per Lbs.) a day. After we had fixed the line, we were using approximately 1 foot per day which equals 1 box Ascorbic acid. $246 a day.
Although looking back through the first part of the 2018 winter discharge season DMS sheets ( Jan-May) we were using 170 gallons of Ascorbic acid per day. At this time that was 1 ½ boxes Ascorbic acid being used a per day.
To say that we were using 3ft feet a day would be a little much. The Ascorbic acid line had been leaking for some time, but I don’t think to the extent that we saw in the video base on past records.
At this time after fixing the leak I would say that were able to cut the Ascorbic acid use by ½ a box to ¾ of a box a day from the original use of 1 ½ boxes a day over last year winter discharge season, which would equate to a saving of $23k to $33K per discharge season (Nov.1-April.30)
Jake Ehredt
Lead WWTP Operator
City of Molalla
Cell 971-241-7547
Shop 503-829-5407
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From: Andy Peters
Sent: Tuesday, November 13, 2018 1:11 PM
To: Jake Ehredt <jehredt@cityofmolalla.com>
Cc: Gerald Fisher <gfisher@cityofmolalla.com>
Subject: RE: DMS Vitamin C.
Thank you Jake! Looking at that video I’d say I see 12 drips at 1 drip per second, which is a daily waste of 103.68 gal, 3110.4 gal/month.
- 1. Can you remind me what the concentration of this water is?
- 2. How many lbs of purchased vitamin is needed to mix water to that solution?
- 3. What is the $$/lb we pay for vitamin C right now?