Industrial wastewater and sewage treatment plants are a common source of malodour that can have a big impact on the nearby communities and commercial centres.

Volatile compounds and amines are organic compounds that confer a range of malodours from body odour to rotting fish, and their production can outstrip the capacity of plants to contain or treat them.

Many WWT plant odours are caused by biological sulphur-based compounds like hydrogen sulphide (H2S) and mercaptans which are detectable at very low concentrations and are often caused by nuisance bacteria that grow in anaerobic environments.