This is free from the site: the dissolved air flotation page, running the same correlations as the workbook. Watch the feed flow go up and the loading check turn red — above limit, carryover — then the recycle ratio come up and the air-to-solids ratio recover. Nothing is a mock-up; those are the page's own calculators. The workbook is the same checks for all nineteen unit operations, in Excel, with every formula on the sheet where you can read it.
This is a tip jar, not a product.
Winston Water Engineering is a free reference for water and wastewater process design — eighteen animated unit operations, a material compatibility matrix, and calculators that run in your browser. There are no adverts and nothing behind a paywall, which means the site has no income of its own.
If it has saved you an afternoon and you would like to put something toward keeping it there, this is the way to do it. Pay whatever you think it was worth.
What it pays for:
• Hosting and the domain
• Keeping correlations and standards current
• The next unit operation — each one is days of work, not hours
You are not buying access. Nothing unlocks, because nothing is locked. The file attached is a one-page thank-you note, and that is all it is.
Found something wrong on the site? Tell me instead — a correction is worth more to me than a payment, and it gets fixed and credited.
winstonwaterengineering.com
