scholarly journals Canadian Pulp and Paper in World Trade

1978 ◽  
Vol 54 (3) ◽  
pp. 147-151
Author(s):  
D. B. Cooke
Keyword(s):  
Kraft Pulp ◽  
Paper Industry ◽  
Pulp And Paper ◽  
Forest Resource ◽  
Pulp Industry ◽  
Bleached Kraft Pulp ◽  
Self Sufficiency ◽  
Excellent Growth ◽  
World Demand ◽  
Pulp Fibres

Canada still commands a major position in two key world pulp and paper products which come from our softwood forest resource — newsprint and woodpulp. In 1977 Canada produced 40% of the newsprint and 30% of the softwood bleached kraft used in the free world. Fine papers, linerboard and tissue grades of paper are made chiefly for the domestic market and are all tariff protected.After 30 years of excellent growth, the future prospects for the Canadian pulp and paper industry are clouded by: slower world demand for paper and board, increased self-sufficiency for newsprint and pulp in many of Canada's key markets, continuing trends to substitution of cheaper pulp fibres for the more expensive softwood bleached kraft pulp, the cornerstone of Canada's pulp industry.

Improvement of Sludge Settleability in Activated Sludge Plants Treating Effluent from Pulp and Paper Industries

1999 ◽  
Vol 40 (11-12) ◽  
pp. 215-221 ◽  
Author(s):  
Kjær Andreasen ◽  
Jeanette Agertved ◽  
Jens-Ove Petersen ◽  
Henrik Skaarup
Keyword(s):  
Activated Sludge ◽  
Paper Industry ◽  
Treatment Plant ◽  
Pulp And Paper ◽  
Detailed Knowledge ◽  
Effluent Quality ◽  
Pulp Industry ◽  
Substrate Removal ◽  
Filamentous Microorganisms ◽  
Pulp And Paper Industries

The main objective of many activated sludge plants treating wastewater from the pulp and paper industry is to remove COD only. These plants are often designed as high-load aerobic systems without any microbial selector system. As a consequence the sludge settling properties are normally poor due to fast growing filamentous microorganisms, which severely reduce the treatment capacity and the effluent quality. Implementation of selectors, in which the substrate concentration and the metabolic pathways can be manipulated, has in many cases reduced the bulking sludge problems in activated sludge systems. An example of a successful upgrading of a Danish pulp industry wastewater treatment plant with an anoxic selector is presented. the use of a novel technique to investigate the in situ physiology of filamentous microorganisms is discussed. It is concluded that a successful application of selectors relies on detailed knowledge about: a) physiology and substrate requirement of the filamentous microorganisms, b) wastewater composition and c) substrate removal kinetics in the selector system.

IDENTIFICATION OF COMPOUNDS ASSOCIATED WITH TESTOSTERONE DEPRESSIONS IN FISH EXPOSED TO BLEACHED KRAFT PULP AND PAPER MILL CHEMICAL RECOVERY CONDENSATES

2006 ◽  
Vol 25 (9) ◽  
pp. 2322 ◽  
Author(s):  
Andrew M. Belknap ◽  
Keith R. Solomon ◽  
Deborah L. MacLatchy ◽  
Monique G. Dubé ◽  
L. Mark Hewitt
Keyword(s):  
Kraft Pulp ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Chemical Recovery ◽  
Pulp And Paper Mill ◽  
Bleached Kraft Pulp

Proposal for water reuse in the Kraft pulp and paper industry

2013 ◽  
Vol 8 (3-4) ◽  
pp. 359-374 ◽  
Author(s):  
M. J. Kossar ◽  
K. J. Amaral ◽  
S. S. Martinelli ◽  
M. C. L. Erbe
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Water Reuse ◽  
Kraft Pulp ◽  
Paper Industry ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Paper Machines

The reuse of wastewater by the pulp and paper industry reduces environmental impacts by contributing to raw water conservation, thereby making a greater volume of fresh water available for nobler purposes, and reducing wastewater treatment. This study evaluated a proposed system of water reuse at a Kraft pulp and paper plant in Brazil, based on a survey of water quality required by its consumption points, supplied by its water treatment plant. Results after ultrafiltration included: turbidity of 0,3 NTU and pH 7,5, average values of BOD 66,4 mg/L, COD 9,6 mg/L and the colour of 280,5 ppm Pt were measured after ultrafiltration. The ultrafiltered wastewater was considered available for reuse, and its quality was compared with that of the water supplied by the water treatment plant, which provided for the classification of potential reuse points. Water colour was identified as the limiting factor for reuse; thus the reuse points were two Kraft paper machines, and the water flow to the liquid ring formations that generate the vacuums inside nineteen pumps for these two machines. The advantages of this proposal for water reuse include: ultrafiltered water quality sufficient for the vacuum pumps, the small distance between the point of reused water generation and the paper machines section, and the reused water has no contact with the final product. The calculated cost and return time for the water reuse system was US$ 607.020,00 in 15 years.

Sign in / Sign up

Export Citation Format

Share Document