Caldera Insights

Practical engineering notes on acid and chemical scrubbing

Sizing, materials, permits and the problems we see on real sites. Written by the engineers who design and build our scrubbers.

Battery recycling · Featured Black mass processing: the off-gases battery recyclers have to control Shredding, pyrolysis and leaching each release a different mix of gases. Here is what to expect at each stage, and how to plan for it. Caldera Technical · 30 September 2026 Read the article

Acid fume Hydrogen fluoride from battery recycling and etching: why HF needs its own scrubber design HF behaves differently from other acid gases. The materials, liquor and water quality all need to be chosen with that in mind. 12 August 2026

Permits and compliance Environmental permits for acid and chemical emissions: what regulators expect from your abatement Whether you answer to the Environment Agency, a local council, TA Luft or an ICPE prefecture, the questions about your scrubber are remarkably similar. 24 June 2026

Tanker unloading Delivering bulk HCl, nitric and ammonia: controlling tank fume during tanker unloading Every litre that goes into a storage tank pushes a litre of fume out. Here is how to size and site the scrubber that catches it. 20 May 2026

Ask an engineer

Not finding your process here?

Tell us what is in your extract. A process engineer replies within 4 working hours with a straight answer, even if the answer is that you do not need a scrubber.

Describe your extract

Acid fume Acid fume from electroplating, anodising and pickling: what to extract and how to treat it Plating, anodising and pickling lines each produce their own acid fume. Here is what comes off the tanks and the scrubbing approach that suits each. 22 April 2026

Odour control Scrubber, carbon filter or biofilter? Choosing the right odour treatment Each technology has a load range where it shines and one where it struggles. Matching the two is most of the decision. 25 March 2026

Odour control Hydrogen sulphide and ammonia at industrial sites: removal options compared H2S and ammonia are the two gases behind most odour complaints. They need opposite chemistry, which is why order matters in a scrubber. 18 February 2026

Chemical scrubbing Caustic soda or hypochlorite? Choosing and dosing scrubbing liquor The reagent in the sump decides what your scrubber removes. Here is how to choose it, control it and handle it safely. 21 January 2026

Design and sizing Random or structured packing? How packing choice changes scrubber size, cost and pressure drop Packing sets the height, the fan duty and how well a scrubber tolerates fouling. Here is how the two main types compare. 10 December 2025

Design and sizing How does a wet scrubber work? Absorption, packing and scrubbing liquor explained What actually happens inside a packed tower, why the liquor matters more than the vessel, and the limits every buyer should know. 12 November 2025

Have a scrubbing problem now?

Send us the duty. We will tell you what it needs, what it costs and how long it takes. No obligation, and we are happy to sign your NDA first.