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RECHERCHES SUR LA NATURE ET LA LUTTE CONTRE LES DEPOTS MICROBIOLOGIQUES DANS LES CIRCUITS D’EAU D’UNE MACHINE A PAPIER


STANCIU CONSTANTIN
UNIVERSITÉ «DUNAREA DE JOS» GALAŢI, FACULTÉ D’INGÉNIERIE BRĂILA, 29 RUE CALARASI, RO-810017 BRĂILA, ROUMANIE, DECANATBR@UGAL.RO

Issue:

SCSCC6, Volume VII, No. 4

Section:

Volume VII, No. 4 (2006)

Abstract:

The micro-organisms are giving various problems in the paper manufacturing processes: holes in the sheet of paper caused by slime, the contamination of the additives, odors and corrosion. These microorganisms have the tendency to make agglomerations and to fix themselves on the walls of the circuits of paper machines like bio-films. The capacity to fix itself on the walls of the water circuits is a characteristic of micro organizations. In the first part of the paper the conditions of development (nutrients, water, free and combined oxygen, and temperature) are presented and contamination sources with the main microbial populations are identified. The main biological components of the deposits in a paper factory are the bacteria, the yeasts and the moulds. A comparative situation of the bacterial charge of three different water circuits (paper made from 100% bleached pulp, paper made from 100% virgin pulp, and paper made from 100% deinked pulp is presented. The most contaminated circuits are those involved in processing old papers. It was also studied the microbiological loading at a certain time of the year (the most serious problems appear during spring – autumn) and also according to the kind of paper manufactured (especially acid or alkaline). The negative effects of the proliferation of the bacteria can be drawn aside by the specific use of biocides. The efficiency of the use of a biocide depends on pH, dosing place, the added amount and also the mode of dosage (shock or continuously).

Keywords:

pulp, paper, microorganisms, microbiological deposits, biocides.

Code [ID]:

CSCC6200607V04S01A0022 [0001600]

Full paper:

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