scholarly journals ETS-1 process water system test program report

1965 ◽  
Author(s):  
J.F. Christenson ◽  
H. Henze
Keyword(s):  
Water System ◽  
Process Water ◽  
Test Program

Cod Removal in a Closed Water Circuit of a Papermill by an Anaerobic Fluidized Bed Reactor

1992 ◽  
Vol 26 (1-2) ◽  
pp. 445-454 ◽  
Author(s):  
M. C. Barascud ◽  
F. Ehlinger ◽  
M. Pichon ◽  
J. Rouger
Keyword(s):  
Fluidized Bed ◽  
Water System ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Process Water ◽  
Organic Load ◽  
Flow Sheet ◽  
Circulating Water ◽  
Biomass Activity ◽  
Closed Water

In waste paper processing mills, entirely closed process water systems cause high specific polluting problems, deteriorate the quality of the paper produced and corrode the equipment. Operating an anaerobic fluidized bed on part of the circulating water could make it possible to achieve lower dissolved organic concentration in the closed process water system. Laboratory experiments have been carried out according to the following flow-sheet : Water circuit; Acidification tank; Fluidized bed. When the anaerobic treatment is added to the water circuit, COD removal is 75% in the circuit and 65% in the acidification tank. Consequently, until reaching steady state, the organic load entering the fluidized bed decreases continuously from 28.75 to 9.86 kg COD/m3 d−l without disturbing biomass activity. From a mass balance, a mathematical model is drawn to check the COD removal in the water circuit and study the transitory period. Efficient fluidized bed performances are achieved even with high organic load (28.75 kgCOD/m3d−1) 52% to 75% COD removal are obtained in the water circuit respectively within 75 and 24 hours. The treated water represents a very small part of the circulating water. To achieve 52% COD removal the equivalent of 0.5 m3/t produced paper is treated. For a 75% COD removal efficiency, treated flow rate is 2.6 m3/t produced paper.

Recycled paper mill process water pre-treatment using ultrafiltration for water system closure

2021 ◽  
Vol 44 ◽  
pp. 102407
Author(s):  
Hans Estrella Cainglet ◽  
Tomas Saavedra ◽  
Stefan Bürgmayr ◽  
Jianhua Zhang ◽  
Zongli Xie ◽  
...  
Keyword(s):  
Water System ◽  
Paper Mill ◽  
Process Water ◽  
Recycled Paper ◽  
Pre Treatment ◽  
Mill Process

Effluent-free papermaking: industrial experiences and latest developments in the German paper industry

2007 ◽  
Vol 55 (6) ◽  
pp. 205-211 ◽  
Author(s):  
U. Hamm ◽  
S. Schabel
Keyword(s):  
Paper Industry ◽  
Water System ◽  
Process Water ◽  
Paper Mills ◽  
Comprehensive Survey ◽  
Pros And Cons ◽  
Closed Water ◽  
Ongoing Development ◽  
White Water ◽  
Packaging Paper

Thanks to multiple recirculation of process water, the German paper industry has succeeded in decreasing the specific fresh water demand from an average of 50 m3/t thirty years ago to 13 m3/t today. Although the increasing closure of white water loops creates many problems, it is bound to be part of the German paper industry's ongoing development. For a few years, in the production of packaging paper, two paper mills have been running with a totally closed water system including different process water treatment plants as ‘kidneys’. This paper presents a comprehensive survey of the pros and cons of closed process water systems followed by significant examples of effluent-free production of corrugating medium and test liner. Additionally, operation experiences and economic aspects are discussed.

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