August 13, 2019

Kotkamills to boost chemical recycling – new solution to reduce environmental load by thousands of tonnes

At the turn of 2020-2021, paper and board mill Kotkamills will adopt a closed-cycle solution to boost chemical recovery. The chemical oxygen demand of the wastewater treatment plant will fall by around 20 per cent and the carbon dioxide emissions will decline by approximately 3,500 tonnes. The solution will be implemented by Adven.

The new project is a continuation of Kotkamills’ and Adven’s previous black liquor evaporation service in which Adven is modernising and renewing Kotkamills’ evaporation plant into one of the most energy-efficient plants in the world. Now Adven will implement a new odorous gas boiler and sulphur recovery plant for the mill.

“We are continually developing our production to become more resource-wise. Effective use of incoming raw materials is not enough, but it is also important to be able to utilise by-products from the production process more efficiently. Projects like this are rewarding because, in addition to cost benefits, there are significant positive environmental effects,” says CFO Petri Hirvonen from Kotkamills.

“We are looking to further deepen the utilisation of Adven’s comprehensive offering of top-of-the-line energy and water solutions for the paper and board industry’s needs together with Kotkamills,” says Sales Manager Teemu Kivimäki from Adven. “Our smooth co-operation in the first project and our shared intent on increasing environmental friendliness were factors that contributed to the new agreement,” Kivimäki adds.

Methanol incineration will produce steam for the mill

Adven’s black liquor evaporation plant allows the recovery of methanol. The new project will make it possible to burn the methanol together with the odorous gases from the mill’s production to recover their energy content.

The steam produced during the incineration process will reduce the mill’s natural gas consumption, resulting in an estimated annual reduction of 3,500 tonnes in the mill’s CO2 emissions. The sulphur contained in the flue gases from the incineration process will also be recovered, which will reduce the mill’s need for make-up chemicals.

Thanks to the new solution, Kotkamills’ wastewater plant’s COD (Chemical Oxygen Demand) will substantially decline, thus also reducing the environmental load. The mill’s total emissions will decrease, and its energy efficiency will improve.

Additional information:

Adven, Teemu Kivimäki, Sales Manager, tel. +358 40 561 5361,

Kotkamills, Petri Hirvonen, CFO, 040 571 0834,

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