Power Plant Question

I imagine it would be hard to estimate this very closely, even if the soot thickness were known (and which might vary quite a bit). How about using a bag at a time, measuring the pH each time, and getting a trend?

Thanks, I don't really see a lot of build up of soot with the oil we are using. I was thinking of doing titrations in the lab to stay ahead.I have to buy all the soda ash 1 week ahead so planning of quantities is important. I would like to overbuy and store than not buy enough.

Hello everyone

We finished our 5 day economizer wash of two boilers. The ph was not an issue---close to 7.0--Used one bag of soda ash but probably not even needed. Turbidity was a bigger issue and we had to use a bag of Z-TAG polymer that was listed on our permit to take out the ash.

I'd do a 10 lbs trial, get your data then attack

That sounds like a good idea.

According to my calculation you need ~ 3.5 lbs to raise each .1 ph...

I'd say black coffee....so about 70 lbs....give or take

If you have a competent lab staff capable of performing titrations, they can do a much better job of advising you than guestimates from here.

pH=7 will do fine for telling you when you are at neutral, at the time of testing.

If you can long-term store the soda ash, overbuy. It can't be very expensive.

100,000 gallons seems like a nice round number. Hope you're not hoping for a number from here to scale up or down.

Hi there

Used to have a staff-now its no one! We used a bag of the soda ash sitting around. The ph was the issue but turbidity was so we added a bag of polymer to settle it out.

It depends upon a lot of factors, such as the nature and strength of the acidity in the wastewater and the discharge consent limits applicable, which haven't been stated.

pH paper is a rather crude indicator; it would be better to use some sort of calibrated instrument so that when the utility requests traceability of the effluent, it can be provided.

We neutralized in a small pit upstream of the final discharge. There is a turbidity meter and ph indication on the final effluent.

Wonderful. Do let the forum know how it all went.

Correcting the pH value is only a minor problem. What do you intend to do with all the nasty residues that will accumulate?

In a similar situation we lost the effluent over a 5 month period by adding it to our process water.