15 because water is priceless THE ADDITIONAL SMALL KIDNEY FOR THE SAALE RIVER The nitrate content of water is primarily influ enced by agriculture with nitrates becoming a growing problem for water conservation The desalination function of the paper mill s waste water treatment plant is good for the environment with the waste water treatment plant acting as an additional small kidney for the Saale The nitrate content of the water drawn from the Saale exceeds 5 mg l after purification and treatment the water has a significantly lower nitrate content of less than 2 mg l POWER GENERATED FROM BIOGAS DIRECTLY ON SITE Another additional benefit that makes a valuable contribution to the supply of renewable energy is the use of biogas produced during the waste water treat ment process This biogas is processed onsite using desulphurisation immediately converted into electricity and fed into the pu blic grid The plant has an output exceeding 2 000 000 kWh per year which corresponds to the power requirements of approximately 540 residential households

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