A free engineering reference · since 2009
A practical field reference for students and engineers — process theory, plant design, worked examples and the day-to-day judgement that textbooks leave out.
Nine areas, from raw-water chemistry to full plant design. Each opens a curated set of guides.
Primary, secondary and tertiary treatment of municipal and industrial wastewater.
33 guidesFiltration, coagulation and the unit processes that make water potable.
27 guidesSources, chemistry and the physical properties behind every process.
16 guidesSampling, testing and reading the parameters that define quality.
13 guidesChlorination, UV and ozone at the final barrier.
9 guidesRemoving hardness with ion exchange and lime–soda.
6 guidesReverse osmosis and thermal routes to fresh water.
7 guidesWhy plant and pipework fail — and how to slow it.
A rotating selection of articles pulled at random from the library, with brief summaries so you can dive straight into the right guide.
Nitrification and denitrification are two interconnected biological processes that remove nitrogen from wastewater. In nitrification, bacteria convert ammonia to nitrate; in denitrification, bacteria convert…
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Read article →The treatment train
Every plant is a sequence of barriers. Follow the flow — each stage links to the guides that explain it.
Raw water enters; bar screens and grit channels remove debris.
Coagulants destabilise fine particles into settleable floc.
Floc settles out under gravity in clarifiers.
Rapid sand and media beds polish the remaining turbidity.
Chlorine, UV or ozone inactivate the remaining pathogens.
Treated water is pumped to storage and the network.
Hand-picked starting points and the guides engineers return to most.
Beyond the articles — tools and references you can take with you.
Open the full library and work through it at your own pace — no sign-up, no paywall.