Method and processing system for reducing volatile organic compounds from wood chips

A method for reducing volatile organic compounds, VOC, from wood chips for wood fibre production in a processing system, comprising at least the following successive steps:

• first thermal treatment of the wood chips with water and/or steam in a first thermal treatment device adapted to receive exhaust gases containing VOCs;
• cleaning of the wood chips in a washing device;
• second thermal treatment of the wood chips with water and/or steam in a second thermal treatment device which is designed to receive and separate exhaust gases containing VOCs;
• cooking the wood chips with water and/or steam in a digester adapted to receive and remove VOC-containing flue gases;
• and
• crushing the wood chips in a refiner adapted to remove VOC-containing exhaust gases, wherein the material flow of the wood chips is from the first thermal treatment device into the washing device;
• from the washing device into the second thermal treatment device;
• from the second thermal treatment device into the cooker;
• and
• from the cooker into the refiner, and wherein the exhaust gases containing VOCs are mixed with the water and/or steam in the respective thermal treatment device and digester.