TREATMENT OF USED PAPER PULP WASTE WATER

• Main Authors: KASAMA NOBUKATSU, KURITA RYOZO
• Format: Patent
• Language: English
• Published: 09.02.1999
• Edition: 6
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To rapidly flocculate and sediment even a fine suspended substance and to discharge supernatant water to natural rivers by adding a condensation type polyamine to used paper pulp waste water before adding a polymeric flocculant. SOLUTION: At the time of the treatment of used paper pulp waste water discharged from a papermaking facotry, at first, a condensation type polyamine is added to the used paper pulp waste water. As the condensation type polyamine to be used, a condensate of an alkylene dichloride and an alkylene- polyamine, a. condensate of aniline and formaline, a condensate of an alkylenediamine and epichlorohydrin and the like are designated. After the condensation type polyamine is added, a polymeric flocculant is added. As the polymeric flocculant added at this time, a known cationic polymeric flocculant is designated and added to water containing fine suspended matter usually in an amt. of 0.1-10 ppm, pref., in an amt. of 0.5-5 ppm and, thereafter, flocs are separated and collected from water.