CMPC Guaíba pulp mill, Brazil

CMPC Guaíba pulp mill, Brazil

In 2021, CMPC decided to turn their pulp mill in Guaíba, Rio Grande do Sul, Brazil into one of the most sustainable pulp mills in Brazil and asked Efterklang’s acoustic consultants to be a part of the project that was named BioCMPC.

Project details

CMPC Brazil



The BioCMPC project was carefully designed based on the corporate purpose of: Creation, Coexistence and Conservation. The initiative arose after studies uncovered opportunities for improvement in terms of the environmental performance and efficiency of the division.

The project interventions are divided into measures around implementing new environmental control equipment and improving existing systems, new initiatives focused on environmental management as well as operational modernization actions.


During 2021, Efterklang had weekly online meetings with all the potential vendors for the project in order to assess the quality of their suggested equipment in terms of noise and vibration and at the same time assist them in providing CMPC with the best possible proposals for the new facilities, based on both general and specific noise requirements set by us for the project.

After the conclusion of the vendor biding and award process we continued to support CMPC with control of modifications to the project that could affect the noise situation and we have been to Brazil several times to conduct external noise mapping updates and external noise control in the community. Parallel to this, a noise mitigation plan was prepared to mitigate the noise of the existing mill.

At the end of 2023, we took part in the Provisional Acceptance tests for the new equipment in order to assess if everything is fulfilling the noise requirements of each vendor’s equipment and facilities as set by us in the beginning of the project.


The PA test results revealed that for all the parts of the BioCMPC project where our recommendations were followed, the equipment met our expectations regarding noise and vibration levels. For the parts that did not fulfill these requirements, new mitigations measures have been suggested and we continue to support CMPC in reaching the environmental goal for the project in regard to noise. Furthermore, by systematically identifying different noise sources and applying mitigation measures throughout the assignment, we are able to ensure that noise levels can be reduced significantly and that the comfort of the community in terms of noise perception is further improved.

Contact person
Michail Rinakakis