The circa 30 million Euros investment will cover the rebuild of all of the main phases of waste water treatment. The work will start immediately and is to be completed at the end of 2013.”With the rebuild of the effluent treatment plant we will improve the pulp mill’s production efficiency and reduce its environmental impact. The rebuild will also enable further development of the mill in future”, says the mill’s General Manager, Kenneth Winberg.The construction includes a new preliminary clarifier for fibres and an aeration basin, created mainly by excavating rock. The pumping station and compressor house will be completely new constructions.UPM is currently reviewing water management and efficiency in material use at several mills. By 2020, UPM aims to have reduced waste water volume by 15 percent in pulp and paper production, compared with levels in 2008.UPM Pietarsaari pulp mill is the biggest pulp mill in Europe with an annual production capacity of around 800,000 tons of softwood and hardwood pulp. The mill employs about 300 people.The Pietarsaari mill site also includes a packaging paper mill. In February, UPM signed an agreement on the sale of its packaging paper production to Swedish Billerud.