Process for making paper and cardboard

摘要

PCT No. PCT/EP94/03225 Sec. 371 Date Jun. 18, 1996 Sec. 102(e) Date Jun. 18, 1996 PCT Filed Sep. 27, 1994 PCT Pub. No. WO95/09817 PCT Pub. Date Apr. 13, 1995Process for making paper and cardboard, wherein at least one nitrate or basic nitrate of a trivalent metal is used as sizing agent, so that the process wastewater, after a biological denitrification treatment, can be discharged into the environment without causing pollution problems and/or can be reused at least partially as fresh water, with great savings in consumption.