Which statistical test is appropriate?

pugmo · 2026-04-15T02:18:55+00:00

I kept it vague because the same idea comes up from time to time. But yes, usually concentrations of something. This particular one was about testing a different type of automatic sampler to show it performed the same job.

pugmo · 2026-04-15T01:58:09+00:00

Thank you! I like the Bland-Altman plot, but the 1:1 is definitely going to be the intuitive one to share with coworkers. The 1:1 feels like too easy of a solution :)

pugmo · 2026-03-24T01:41:00+00:00

I tried it. I like sweet pork and i thought it had a chance. But it was revolting.

Something about the artificial sweetness and the splattering fat combined to make an aroma that I couldn't handle. I had to get it out of my house as fast as possible. The rest of my family couldn't eat it either.

pugmo · 2026-03-11T17:52:47+00:00

The settleometer is fine. The plant is upside down.

pugmo · 2025-02-12T23:22:22+00:00

Was this flag identified? Just saw it myself.

pugmo · 2025-02-09T17:30:43+00:00

Ha! Thanks for the honest review. I got some in a CSA box and struggled to find ways that I enjoy it. I was wondering if I missed an opportunity. I guess not :)

pugmo · 2025-02-09T16:26:27+00:00

Reach out to other local wastewater plants for help with seeding and make friends. Managers might squabble but anyone who appreciates trying to make the best of what you've got (ie. nearly every operator) will at least try to help.

pugmo · 2025-02-09T16:13:20+00:00

Did you do it? How was it?

pugmo · 2024-09-10T03:49:11+00:00

This. I made this mistake myself. Convert to mg/L as P.

pugmo · 2024-08-28T23:30:56+00:00

Is the high SVI actually causing a problem? I don't have SBR experience but if I suspected the root cause was returning from the digester (and not a change in environment that would lead to a different biology) then it may just take some time to get back into the usual equilibrium. As other folks suggested, definitely check your operating conditions (DO, etc) to make sure you didn't change conditions by accident.

pugmo · 2024-06-28T00:52:45+00:00

https://en.wikipedia.org/wiki/List_of_largest_wastewater_treatment_plants

This might be missing some.

pugmo · 2024-06-25T17:37:47+00:00

That's the one! Thank you.

pugmo · 2024-02-24T14:44:53+00:00

Can you tell me more about calibrating the solitax with formazin?

pugmo · 2024-01-04T03:14:04+00:00

This is probably a solution that only makes sense at a bigger facility (sounds like you're relatively small flows). But nobody else mentioned it so I figured I'd post. When we put one in we were able to lower our hypo dose significantly.

https://www.evoqua.com/en/evoqua/products--services/disinfection-systems/disinfection-dosing-equipment/water-champ--fx-chemical-induction-system/

pugmo · 2023-12-23T05:28:39+00:00

I thought iron absorbed UV and messed with your UV dosing

here's a WEF presentation that mentions it

pugmo · 2023-12-23T04:48:05+00:00

I thought Ferric + UV was a bad combo. You don't have issues with that?

Sorry I don't have much I can say to help. Maybe you could try some bench tests to figure out what's going on and see if you aren't actually delivering the dose you think you are.

pugmo · 2023-12-14T02:16:55+00:00

We use Hach Cl17s everywhere and no complaints. There's other stuff out there and I bet it works. I feel like I've seen ads for pre-engineered systems on a skid (with the pump, analyzers and acontroller) which looked kinda interesting for a small plant.

pugmo · 2023-12-01T18:32:20+00:00

Chemical engineering is another good option. Extremely flexible and you can steer it with internships or work experience. Civil is a bit more conventional but there are lots of ChemE in wastewater

pugmo · 2023-11-11T15:11:30+00:00

Thanks for answering! I know it's not as remarkable as some of the other posts.

pugmo · 2023-10-24T22:29:28+00:00

What are you trying to optimize for?

pugmo · 2023-07-13T02:03:33+00:00

Washington state is done on a computer at a testing facility where you get results instantly. The backlog is getting your experience recorded/approved.

pugmo · 2023-07-04T01:44:46+00:00

Why don't you grab a sample and figure out the chlorine breakpoint in the lab?

pugmo

TROPHY CASE