Institut national de la recherche scientifique INRS-ETE
The Pulp and Paper Research Centre is an academic unit devoted to the development of research and to the education of graduate students in an interdisciplinary context. From this angle, the Centre takes advantage of methodologies and experimental approaches drawn from several disciplines and from different researchers in the pursuit of collective objectives defined according to the participants' abilities, the available resources and developments in the fields involved.
In this context, the Pulp and Paper Research Centre has adopted a structure which allows it to contribute to the achievement of institutional objectives by developing research in a priority area for the Universit du Qubec Trois-Rivires, as well as by educating graduate students.
The Centre de recherches en ptes et papiers combines the study of scientific problems directly related to the pulp and paper industry with phenomenological and technological aspects in order to contribute to the efficient development of this industry in Qubec. The field of scientific activities which can be applied to pulp and paper is immense, and incorporates numerous research areas which can be located upstream or downstream of the more technological operations taking place inside the actual mills. The Pulp and Paper Research Centre at UQTR has favoured research areas which are fundamental to these activities and which are oriented to the creation of works that tackle different facets of the problems under consideration, but without exhausting this very large field of study. The accepted areas of research concern aspects which can promote the interfacing of several disciplines and which can optimize the participation of chemists, chemical engineers, forestry engineers and biophysicists highly specialized in the area of pulp and paper.
Company Details
Company Information
R.D. Tyagi
Title:
Professeur
Telephone:
(418) 654-2524
Fax:
(418) 654-2600
Email:
Click Here
Claude Daneault
Title:
Manager
Telephone:
(819) 376-5075
Fax:
(819) 376-5148
Email:
Click Here
Products
Environmental Products And Services
Bacterial Leaching Process (patent Serial Number: 2104865).
Value Added Products.
Utilization of wastewater sludge as a raw material for the production of value added products.
Services
Heavy Metal Bioleaching And Stabilization
Heavy metal bioleaching and stabilization of municipal sludges.
Dissolved Air Flotation
The processing of suspended solids contained in the wastewater from activated sludge bioreactors normally takes place through sedimentation with the use of a secondary sedimentation tank. These solids often present difficulties in the sedimentation process, which are exacerbated by operational problems relating to the aerator located upstream. Thus, the solids tend to float and to form a favourable environment for the development of a network of filamentous bacteria which remain stagnant. Otherwise, when an aerated pool is used to treat the wastewater, the anticipated sedimentation zone cannot always yield a satisfactory rate of removal of suspended solids
In order to compensate for these difficulties and to improve the overall efficiency of the secondary treatment of sludge in the pulp and paper sector, researchers from the Research Centre in Pulp and Paper at the Universit du Qubec Trois-Rivires, collaborating with a group of manufacturers, examined the possibility of using a dissolved air flotation system as a substitute for secondary sedimentation tanks or sedimentation zones in aerated pools. The system's operation conditions were optimized on the site of two de-inking facilities
The flotation units used in the framework of these tests, manufactured by Les Traitements des Eaux Poseidon Inc., use dissolved air to increase the floatability of suspended solids and to facilitate their processing. Moreover, an internal recirculation loop creates an intermediary capture zone which, in addition to reducing the risk of overflowing, furthers the flocculation of particles which do not float spontaneously. A skimmer then removes the layer of partially de-watered sludge with the help of a patented system
The dissolved air flotation unit has made possible the removal of almost 98% of the solids coming from activated sludge reactors; the addition of polymers slightly increases this amount. Under unstable conditions or with the proliferation of sludge, the addition of a polymer (<10 mg/L) is deemed necessary; the efficiency of removal is then maintained at around 95%. In the case of sludge from an aerated pool, the addition of ferric chloride and of a polymer raises the removal rate of biosolids to 97%.
Pulp And Paper Research Centre
Pulp and Paper Research Centre (PPRC), Universit du Qubec Trois-Rivires (UQTR).
The colour of industrial wastewater is an environmental problem of a mainly aesthetic nature, but one for which government environmental regulators are beginning to set reduction objectives. There are many solutions for reducing colour and their effectiveness varies greatly. The PPRC has developed a new experimental technology in the laboratory, through which reductions of more than 99% can be achieved at relatively low cost.
A number of trials have been conducted with great success in the pulp and paper area. Customized solutions must be subjected to a laboratory trial before transfer to an industrial scale.