Microbiological treatment of recirculating wastewater from cleaning rolls in a rolling mill

In industry, the use of biological methods for cleaning wastewater is increasing. The number of airborne Gram-negative bacteria was high in relation to the use of high pressure water in a rolling mill using recirculated water for cleaning rolls. Analyzing the total amount and species of microorganisms indicates whether they are emitted from a polluted source or consist of the normal airborne flora.