古紙利用によるテストライナー (Testliner) およびフルーティング (Fluting) を製造する完全無排水製紙工場における生物学的白水処理法

抄録

For more than 25 years Kappa RPE Zülpich Papier, , a producer of corrugating medium and Testliner, has been operated under complete effluent free conditions and is regarded as a pioneer in process water closure. However, the accumulation of organic compounds as well as the increase of salt content, water hardness and concentration of volatile fatty acids has negative effects on the paper quality and the vapour exhaust of the paper machines. To keep up the system closure, a biological treatment plant was integrated in the closed water circuit. An internal anaerobic/aerobic combination was installed. A part of the total process water stream is purified in the treatment plant and reused as process water. Within a few weeks after start-up, the inline process water treatment plant reached the forecast efficiency with very positive effects on the characteristics of process water, paper and the exhaust of the paper machines.