flender drives chennai H2-KH-6-D Helical speed reduction gearbox H2

Flender/Flender Gear Units/Helical speed reduction gearbox H2

anical pulp grade to be bleached and the requirements imposed on it, formulations will have to be optimized. It has been shown that superior bleaching results are attained for pulps of higher initial brightness. Generally speaking, it will not be possible to leave out NaOH and sodium silicate altogether. The resulting COD loads must be put up with. If soda lye is used as deinking chemical, the resulting pHs lead to alkali yellowing of round- wood containing secondary fibre pulps. As counter measure, hydrogen peroxide wilyhaveto be added which is rather expensive. For this reason, tests are performed to reduce NaOH and sodium silicate additions during deinking. Investigations into controlled reduction in NaOH and sodium silicate dosages in flotation deinking rocesses have revealed that, if oleic acid is used as surfactant, NaOH and sodium silicate afditions may be decreased provided certain pH level is maintained. The conclusions for waste paper recyclin and deinking papermills are the following: as NaOH and sodium silicateadditions are reduce2this will decrease chemical costs and offer additional benefits in terms of lower COD loads and diminished environmental impact. 3 Duration: 0 0 9 - 3 0 9 0 ZV9 Subject: Investigation on the formation and fate of toxis organochlorine substances in the pulp and paper industrie Research centre: Fraunhofer-lnstitut fur Lebensmitteltechnologie und Verpackung SchragenhofstraBe 3,8 Munchen Government sponsorship: 6,8 0 DM Sponsorship ratio: 6% 1. Purpose of the Project The possibility of the formation of olychlorinated dibenzofurans (PCDFs) and polychlorinated dibenzodioxins (PCDDs) in the puk industry by chlorine bleaching is well known fact. In the mid 8s this assumption was confirmed by analyses of effluents from the pulp industry. Some very detailed studies in the field of pulp bleaching were carried out since then, but there ist still no systematic investigation on the input, formation and fate