Objective
The water consumption of the paper and board industry, compared to other industries, is of major importance. The current state-of-the-art already avoids about 90% of fresh water consumption by internal recirculation. Further reduction by extended system closure leads to considerable loading of the process water by dissolved fixed and volatile solids which favour the growth of microorganisms. To inhibit or destroy the microorganisms and to prevent slime formation, metal corrosion and bad odours in paper mills biocides are being applied. These are toxic substances that usually impair metabolic activities and by that can impose threats to man's health and to the environment. The planned project aims to control microbial activity in closed water systems without application of hazardous substances. The strategy, however, is not to search nonhazardous compounds and replace currently available biocides. The key to environmentally friendly microbial control is the knowledge of microbial behaviour and interaction in the process water.
The first step is the development of reliable and specific methodologies which allow to measure microbial
activity and to predict problems with paper machine operation and product quality caused by those.
Commercially available methods to check water systems will be evaluated to assess their potential of
differentiating between viable and inhibited cells, slime forming and non slime forming bacteria. Beyond
conventional technologies a new approach is made to describe microbial activity directly related to paper
machine operation. Methods of chemical, biochemical and microbiological analysis are being combined to
differentiate between microorganisms capable of deranging paper machine operation or product quality and
microorganisms which influence less these items. The analytical methods are:
-chemical analysis of easily performed sum parameters like pH, COD, BOD, MLVSS;
-biochemical analysis including immunolabelling, oxygen transfer rates and microrespirometry, nutrient
supply and uptake, head space GC;
-microbiological investigations comprising cytometer sorting, epifluorescence microscopy, MICROTOX
measurements.
The next task is to gather information on the distribution, composition and activity of the prevailing paper mill
microorganisms in the process water, in slime deposits and in the product. The examinations comprehend
microbial screening procedures, chemical analysis of deposits and combined studies on the fate of
microorganisms through the paper machine dryer section.
Trials on the lab scale will have to prove the stressing factors and optimise their performance. They include the
following technologies:
-inoculation of selected bacteria and protozoa from paper machine white water and other sources in
process water circuits
-studies on slime growth and degradation by microorganisms -optimisation of nutrient supply for useful microorganisms related to the needs of paper machine
operation
-chemical control of slime layers
-application of physico-mechanical measures, i.e. high pressure, shear forces, ultrasonic and electrostatic
water treatment
The testing equipment, i.e. a semi-automated labsheet former in combination with several mechanical treatment
devices and a electrostatic apparatus will be run with process water. The water will come from selected paper
mills with closed water circuits exhibiting problems obviously caused by microbiological activities.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences biological sciences microbiology bacteriology
- natural sciences biological sciences microbiology protozoology
- natural sciences physical sciences optics microscopy
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Coordinator
80797 München
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.