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Kitchen waste and industrial waste

The waste which NOAH processes at Langøya comes mainly from the incineration of residual household and industrial waste from Norway and the Nordic region.

Incinerating waste such as ordinary household waste generates ash, which contains a small proportion of heavy metals. The ash must therefore be treated, and the end product after treatment must be disposed of safely. This prevents heavy metals from entering the natural environment. The end product after treatment by NOAH on Langøya, off the coast of Holmestrand, is gypsum residue, which is gas-free and stable.

The reception and storage of the gypsum residue from Langøya in Brevik will form an important part of the Norwegian environmental industry’s infrastructure. If Norway is to continue to be a consumer society with a certain level of industry, it will always have to find responsible ways of managing and processing the waste which we all generate.

Stable gypsum material

The industrial company Kronos Titan AS in Fredrikstad is an excellent example of a waste producer. The plant produces pigments which are used in a wide range of useful products. One waste product generated by the production process is sulphuric acid.

The acid is dried, and contains 75 per cent water when it is delivered for treatment. However, it is still considered to be hazardous waste and must be neutralised.

For many years, the diluted acid was discharged into the river outside the plant. However, for several decades now the acid has been neutralised at NOAH’s plant on Langøya.