At the mill the performance of the closed loop waste water treatment system has been good. The quality of the return water is of a standard very well suitable for use in the mill and actually improves the climate in the mill as well as the operation of the paper machine. Traditional disadvantages of closed loop operation in paper mills are taken away with integration of a combined anaerobic/aerobic treatment plant within the process water circuit. In a world where energy prices are rising and climate change because of CO_2 production becomes more and more important, anaerobic technology becomes and attractive alternative for treatment of waste water from paper mills. In this case in France for example an emission reduction of 1500 ton CO_2/year is obtained.
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