Water and wastewater engineering from Trondheim

A sizing calculator for dissolved air flotation: air-to-solids ratio, recycle flow, flotation area and energy use, with seventeen water-type scenarios. Every parameter carries its source and source type.

A cost and sizing calculator for nitrogen removal at Norwegian municipal treatment plants, based on Norsk Vann 256/2020 and recent Norwegian cost data, with the model checked against four built projects.

Dosing calculators for iron chloride, aluminium/PAC, polymer, caustic soda and lime, with sizing for tanks, dosing pumps, piping and mixing.

An engineering design platform for recirculating aquaculture systems, covering process calculations, P&ID generation, equipment schedules and feasibility reporting. Created by our founder and released under AGPL v3.

Fourteen water-treatment valve types with animated cross-sections, compared characteristic curves, check-valve water-hammer behaviour, and where each valve sits in a waterworks and a wastewater plant.

A selection wizard, 38 duty cards and seven calculators covering every pump position from raw-water intake to sludge and chemical dosing.

Thrust and anchor forces at bends, tees, reducers and dead ends, with test versus operating pressure and pump nozzle load checks to ISO 5199 and API 610.

Head loss and velocity on real bores, part-full gravity sewers with EN 752 self-cleansing checks, and DN/NPS pipe dimensions across ASME, EN and ISO standards.

How ultrafiltration, nanofiltration and reverse osmosis behave in Norwegian drinking water treatment — hygienic barrier, colour and humus removal, cold-water flux, fouling and concentrate handling.

An introduction to the moving bed biofilm reactor: how the process works, what the biofilm carriers do, and how it compares with IFAS and MBR.

A practical comparison of methods for quantifying biofilm on membranes, on carriers and in biofilters — what each method sees, what it costs, and when to choose it.

A look back at three of our own biofilm-MBR studies from 2010–2012: why removing suspended solids did not reduce membrane fouling, and what the colloidal fraction had to do with it.