Darrell Kresge
New Member
Hi folks,
Long time listener, first time caller here.
TL;DR How do we correct for a well producing 29 ppm dissolved Iron, 5.6 pH, 0.684 ppm Mn, 150 NTU Turbidity
With many thanks for your suggestions, here's the long version:
Background:
Water test:
Equipment (in order):
Notes:
Recent events:
My thoughts/questions:
I've read lots of posts here about similarish situations, and hope that we're finally on the right track. If you've made it this far, thank you for reading. And thank you for any advice you can offer!
-----
Watercheck "Problem Check" results of 14 Aug 2020:
('*' denotes excessive)
[Microbiologicals]
Iron Bacteria ABSENT
[Metals] [Physical Factors] [Inorganic]
Calcium 23.700 mg/L Alkalinity/CaCO3 (ND) Nitrates as N (ND)
Copper 0.009 mg/L Corrosivity -4.451 SI Nitrite as N (ND)
*Iron 29.331 mg/L Hardness 170.0 mg/L Sulfate 15.0 mg/L
*Iron-Dissolved 28.748 mg/L *pH 5.6 Tannin/Lignin 16.0 mg/L
Magnesium 27.930 mg/L TDS 190.0 mg/L
*Manganese 0.684 mg/L *Turbidity 150.0 NTU
Potassium 7.000 mg/L
Silica 15.100 mg/L
Sodium 40.000 mg/L
Long time listener, first time caller here.
TL;DR How do we correct for a well producing 29 ppm dissolved Iron, 5.6 pH, 0.684 ppm Mn, 150 NTU Turbidity
With many thanks for your suggestions, here's the long version:
Background:
Well drilled 1995 on Eastern Shore of MD w/ usage of 50-60 GPD
Long history of rusty, "stinky" water controlled by frequent softener
backwash. Recent labs show 28.7 mg/L ferrous iron. Tried a couple things,
skeptical about the local provider's recommendation, have a few ideas, but
looking for solution.
backwash. Recent labs show 28.7 mg/L ferrous iron. Tried a couple things,
skeptical about the local provider's recommendation, have a few ideas, but
looking for solution.
Water test:
Conducted 14 Aug 2020 @ http://www.finsup.net/NTL-913225.pdf (details also at bottom of post)
Equipment (in order):
Stenner Peroxide injector
42MHP2 pump w/ 7% H2O2 set max flow (3.0 GPD)
32 gal pressure vessel
38-58psi cutin/out
Flow rate 8GPM
Flow rate 8GPM
Durawater AIO system
10in x 54in tank w/ Fleck 5600SXT
1.5 ft^3 Centaur Catalytic Carbon
1.5 ft^3 Centaur Catalytic Carbon
Simplus 744( Sulfur Remover
0.5 ft^3 MnO w/ Cl Regen
AN / Softener Combo
Master Water NS30T "Combo Concept 30/40" w/ Autotrol 168
Upper tank 0.5 ft^3 80% Calcite / 20% MgO "NS-Mix"
Lower tank 30k grain standard resin
Upper tank 0.5 ft^3 80% Calcite / 20% MgO "NS-Mix"
Lower tank 30k grain standard resin
Notes:
The presence of the AIO & H2O2 is, umm, unconventional. We installed the AIO system in 2019 before completely understanding the scale of the problem and subsequently added the H2O2 with the goal of increasing the oxidation potential. All other equipment was installed in '95 based on water tests at the time.
Recent events:
Water quality was great following installation of H2O2/AIO but recently plummeted. We've since bypassed the AIO tank and stopped the H2O2 drip.
A local water company was out, tested (after multiple dilutions) 64ppm Iron with drops. Stated the Iron levels in the region are too high to filter and recommended the installation of a 132k grain softener. Possibly two of them.
I suggested that nothing be done until we get proper labs and talk to the good folks at terrylove.com
My thoughts/questions:
The AIO backwash frequency and H2O2 injection rate were never set based on actual data. I suspect the unit is completely fouled. Knowing what we know now, and assuming we shouldn't, in fact, be installing a giant water softener, I'm thinking that/wondering if:
1) The H2O2 applied rate should be increased to 0.97 GPD of 34% H2O2
2) Calgon states max Iron is 10ppm for Centaur. So the media bed of the AIO tank (which we're basically trying to use as a sediment filter / contact tank) is likely insufficient -- maybe replace with KL? Need different backwashing filter? Inline static mixer for H2O2?
3) Well w/ 8GPM places potential pressure and volume limits on media backwash
4) High Turbidity with normal TDS implies what?
I've read lots of posts here about similarish situations, and hope that we're finally on the right track. If you've made it this far, thank you for reading. And thank you for any advice you can offer!
-----
Watercheck "Problem Check" results of 14 Aug 2020:
('*' denotes excessive)
[Microbiologicals]
Iron Bacteria ABSENT
[Metals] [Physical Factors] [Inorganic]
Calcium 23.700 mg/L Alkalinity/CaCO3 (ND) Nitrates as N (ND)
Copper 0.009 mg/L Corrosivity -4.451 SI Nitrite as N (ND)
*Iron 29.331 mg/L Hardness 170.0 mg/L Sulfate 15.0 mg/L
*Iron-Dissolved 28.748 mg/L *pH 5.6 Tannin/Lignin 16.0 mg/L
Magnesium 27.930 mg/L TDS 190.0 mg/L
*Manganese 0.684 mg/L *Turbidity 150.0 NTU
Potassium 7.000 mg/L
Silica 15.100 mg/L
Sodium 40.000 mg/L
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