Iron and Manganese water test

[@syedalikadar8189]

How the coin pushes the needle over it? What is the chemical being used?

[@sabrinagordon6458]

very helpful video, could you kindly list the apparatus and materials that were used? why was black chosen when u placed the cuvette in?

[@damienstefani6578]

Where are your gloves while handling Cyanide?

[@candacemoore9934]

When I do my Mn tests I gently invert the sample cells. Some operators shake them. You do not want bubbles in your sample cells when reading them in the DR 6000 correct?

[@susans7091]

Is there a way I can test my home well?

[@mml4220]

We're currently struggling with manganese removal due to recent floods in east texas. Our plant has never focused on or had an issue with manganese to the degree we're dealing with now. Our system consists of kmno4 dosing at our raw water intake, addition of powdered activated carbon, addition of alum, upflow clarifiers, chlorine gas injection as the water enters our chlorine contact basin, the addition of gaseous ammonia, filtration through anthracite and sand, then the addition of caustic soda before entering our clearwells. When the manganese hit, our raw water ph dropped from around a 7.5 to 6.8. We increased the ph at the raw water intake to achieve around an 8, and found that allowed the kmno4 to work faster, but we still had manganese passing through our system and discoloring our finished water. We purchase raw water from another pws, and mysteriously the ph changed to an 8.5 as we started pulling water from them. Since then the manganese has reduced, but we're still not getting it below a .15 mg/L. A few questions we have are: How are you determining the correct kmno4 dosage and where do you inject it in your system? Have you experienced a filter contamination of manganese and how did you respond and correct it? Are you available for contact?

[@stratman30252]

We increased our alum dosage (almost doubled the required amount from streaming current monitor) at raw water supply at plant entrance and added pre- lime to bring the ph back up to the 7.0 range. We found that manganese removal was dependent on addition of lime and maintaining a ph between 6.8 and 7.0 before floccualtion. Ours was a pre-lime situation. We added 3 mg/l pre-lime, set alum feeder on manual, then adjusted ph Post supply accordingly so our finished ph was 7.0. The actual amount of KMnO4 was determined trial and error (jar testing) and was alot higher dosage than the manufacturer recommended. KMnO4 is injected in raw supply just prior to flash mixing and flocculation. So the addition of pre-lime to get a ph 6.8-7.0 after overdosing alum just prior to sedimentation was critical for us to remove the remaining complex manganese molecules that were not precipitating

[@stratman30252]

we had no filter contamination problems

[@mml4220]

+stratman30252 That's interesting. Are you able to keep your Aluminum levels under the MCL with higher dosage of Alum? We ran a jar test today with higher dosages and found that at double the dosage our aluminum reached a .261. We ended up only going up 20 ppm as it lowered the Manganese to a 0.023 and the Aluminum reached a 0.126. We also use a cl17 with total chlorine reagents to monitor residual potassium permanganate of the clarifier effluent. We just recently discovered that dpd and the cl17 buffers will react with potassium permanganate and show the pink color of prechlorinated water. We've used that to ensure we aren't overdosing the potassium.

[@stratman30252]

Hey Matt see additional comments I added regarding our alum dosing. It wasn't double as stated but w hit it really hard with Alum and pre-lime and it worked. Sounds like it worked for you with .023 result. Thanks for the inquiry!

[@bobfore3839]

I don't understand, you went from .055 to .031 on the iron test and said it was Zero. But you also said you round up to the nearest hundredths, why isn't the finished .03 instead of zero? You also said you round up to the nearest hundedth, but your manganese test you recorded to the thousandth place. Just trying to learn about Iron and Manganese in our water as I am looking at installing a water conditioner and was told iron and manganese would mke the conditioner inert. thanks

[@stratman30252]

hi Bob. thanks for expressing interest in my video. regarding your question about iron test results you’ll notice at 2:20 of the video the raw result was .055, and this was entered in the bench sheet as .06 (rounded up to the higher 100th value) The -.031 finished result result was a negative value on the spectrograph (colored red) and it had a negative hyphen (-) in front of the test result, which we interpret as “0” ppm in sample. So red color numbers plus a negative scan value we interpret as 0 mg/l. Thanks for your input.

[@stratman30252]

In our situation.streaming current called for approx 20mg/l so we ran probably 25-30 ppm in manual (not really doubled but high just the same ) the pre-lime we added required that extra amount of alum to form the flock necessary for the manganese removal.. I am at a different plant now but same company. just goin by memory here) I hope this was helpful. We experience raw spikes of manganese 1.0mg/l every year when our reservoir turns over

[@mml4220]

I'm guessing your raw water has a higher turbidity to require that low of a dosage?

[@mml4220]

Have you considered installing aerators in the reservoir? We added 3, and it really lowered our organics coming in and believe it or not lowers the iron and manganese.

[@stratman30252]

When we used our MIOX generator we could prechlorinate with no THM risk and we had no.manganese problem, but we discontinue using MIOX and wen to liquid bleach so then we were back to square on with MANG removal. Th prechlorinate was so helpful in removal but the generators require too much maintenance and repair

[@mml4220]

I'm sorry I didn't tried prechlorination, our organic levels are too high for that. I meant that you can check the potassium permanganate residual of water before chlorine is added using the powder pillow test method. It's roughly 98% accutate. Since we don't want an excess of potassium in our water we use a cl17 to check the potassium permanganate content of our water that leaves our clarifiers before chlorine is added to it.