Paper mills sometimes produce foul odours that directly impact on the surrounding community. This odour nuisance is often linked to the release of H₂S from the internal effluent systems of the mill. It also comes from odours emitted by bacteria growing in the recirculating water.
Indeed, kraft pulp production requires the treatment of sludges and effluents before they can be discharged from the mill. The pulp and paper industry produces a significant amount of warm, effluent, with high organic matter, which creates an ideal environment for bacterial growth. These sludges and effluents in a pulp and paper mill can release H₂S, which are sources of odour complaints from the community living around the pulp and paper mills.
Many paper mills treat their H₂S with YaraNutriox
Since 1991, Yara, with YaraNutriox, its preventive process against H₂S, has helped many pulp and paper plants across Europe and the globe in their fight against the release of hydrogen sulphide and mercaptans. Biological treatment with YaraNutriox fights against H₂S to prevent the release of this odorous gas.
Mercaptans: a fast and safe solution
To avoid malodorous gases in wastewater treatment plants and sludge dewatering, Yara offers WWTP and industrial installations, EcoNOx®, a fast and efficient curative solution against H₂S and mercaptans. EcoNOx is a powerful oxidising agent. Its active ingredients are already successfully used in environmental applications, for drinking water, surface water and soil treatment. EcoNOx improves the effectiveness of flocculants for sludge dewatering. It can also precipitate heavy metals and neutralise other substances, such as phenols.
How EcoNOx acts against mercaptans?
This treatment against H₂S and odours in pulp and paper mills covers:
- The plant’s network of sludge pipes
- The flocculation tanks
- The filter presses
- The sludge storage tanks
H₂S is more than an odour problem
It is also a toxic gas against which we must protect the employees working in the plant.
Optimise your consumption of products against H₂S
The cost of this solution depends on the complexity of the problem in your site. Our technicians will design solutions tailor made to your problem. These solutions include tools for controlling the injection of the product and verifying in real time the effectiveness of treatment against hydrogen sulphide and mercaptans. So you can change the dosage remotely and use only the product you really need.