scholarly journals Managing solids residuals from pulp and paper production at STORA

2019 ◽  
pp. 253-262
Author(s):  
Per G. Broman
Keyword(s):  
Environmental Quality ◽  
Small Proportion ◽  
Pulp And Paper ◽  
Significant Part ◽  
Forest Industry ◽  
Quality Work ◽  
Paper Production ◽  
Potential Value ◽  
Solid Residuals ◽  
The Way

Solid residuals form a significant part of the flow of materials in forest industry processes. These residuals, are important sources of energy, primarily, and are therefore efficiently utilized. Only a small proportion of the residuals is deposited. Developments are moving toward an even greater degree of utilization of the residuals' potential value. The paper reviews the way STORA uses its resources, the residuals that are generated and how they are utilized. It also intends to provide a picture of how work on residuals forms one part of the environmental quality work that STORA sums up in the word Ecobalance.

Controlling the Settling of Activated Sludge in Pulp and Paper Wastewater Treatment Plants

1999 ◽  
Vol 40 (11-12) ◽  
pp. 223-229 ◽  
Author(s):  
Frédéric Clauss ◽  
Christel Balavoine ◽  
Delphine Hélaine ◽  
Gaëtan Martin
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Pulp And Paper ◽  
Organic Load ◽  
Forest Industry ◽  
Filamentous Bulking ◽  
Mineral Particles ◽  
Mineral Powder

Forest industry wastewaters are difficult to clean: hydraulic and organic load variations, filamentous bulking or pin-point flocs negatively impact depollution processes. The addition of a fine, mineral, talc-based powder, Aquatal, into the aeration tanks of wastewater treatment plants connected to pulp and paper factories has been successfully tested since end of '97. The first case-study presents full results obtained over a period of 18 months in a 20,000 p.e. plant connected to a paper factory. The mineral powder was regularly added to control sludge volume index, thereby ensuring low suspended solids concentration in the outfluent. Plant operators could easily adapt biomass concentration to match organic load variation, thereby maintaining pollution micro-organisms ratio constant. In a second case study, a trouble-shooting strategy was implemented to counteract filamentous bulking. A one-off, large dosage enabled the plant operator to deal effectively with poor settleability sludge and rapidly control sludge blanket expansion. In both cases, the main common characteristics observed were an increase in floc aggregation and the production of heavier and well-structured flocs. The sludge settling velocity increased and an efficient solid/liquid separation was obtained. After a few days, the mineral particles of Aquatal were progressively integrated into the sludge floc structure. When the mineral powder was added to the activated sludge in the aeration basin, chemical interactions frequently encountered with other wastewater treatment additives did not pose a problem. Moreover, with this mineral additive, the biological excess sludge displayed good thickening properties and dewatering was improved. Despite the addition of the insoluble mineral particles, the amount of wet sludge expelled did not increase. Aquatal offers a rapid solution to floc settleability problems which so frequently arise when physical or biological disorders appear in forest industry wastewater treatment plants.

scholarly journals Waste management from pulp and paper production in the European Union

2009 ◽  
Vol 29 (1) ◽  
pp. 293-308 ◽  
Author(s):  
M.C. Monte ◽  
E. Fuente ◽  
A. Blanco ◽  
C. Negro
Keyword(s):  
European Union ◽  
Waste Management ◽  
Pulp And Paper ◽  
The European Union ◽  
Paper Production

scholarly journals Deriving Wealth from the Dry Matter of Some Under-Utilised Plant Parts

2020 ◽  
Vol 8 (02) ◽  
pp. 293-299
Author(s):  
Otoide J. E.* ◽  
Ihinmikaiye, S. O. ◽  
Otoide, T. F.
Keyword(s):  
Carica Papaya ◽  
Raw Materials ◽  
Slenderness Ratio ◽  
Pulp And Paper ◽  
Panicum Maximum ◽  
Wealth Creation ◽  
Plant Materials ◽  
Suitable Alternative ◽  
Paper Production ◽  
Production Industry

The possibility of creating wealth in pulp and paper industry from the underutilized dry matters of the leaf sheaths of the pseudostem (Musa paradisiaca and M. sapientum), leaf stalk (Carica papaya) and stems (Panicum maximum and Andropogon tectorum) have been established from the anatomical parameters and indexes (fibre lengths and diameters, lumen width, cell wall thickness, Runkels ratio, flexibility coefficient (%) and slenderness ratio) of the fibres using standard procedures. Results obtained revealed that the Runkels ratio of the fibres in the five dry matters were 0.60, 0.44, 0.40, 0.87 and 0.93 for Musa sapientum, M. paradisiaca, Carica papaya, Panicum maximum and Andropogon tectorum respectively. These values, each been less than 1 (˂ 1) recommends each of the dry matters as suitable alternative source of raw materials for pulp and paper production industry. It was recommended that these dry plant materials be henceforth harnessed as alternative sources of raw materials for pulp and paper production industry as another means of wealth creation instead of allowing them to waste and cause environmental nuisance.

scholarly journals INFLUENCES OF LOCAL RESISTANCES OF TECHNOLOGICAL CHANNELS OF PULP AND PAPER PRODUCTION ON THE OPERATION OF VORTEX FLOW METERS OF WATER AND WATER SUSPENSIONS OF LOW CONCEN-TRATIONS

2019 ◽  
pp. 307-314
Author(s):  
Iuriy Davydovich Alashkevich ◽  
Mikhail Semenovich Lur’e ◽  
Ol'ga Mikhaylovna Lur’e ◽  
Aleksandr Sergeyevich Frolov
Keyword(s):  
Strouhal Number ◽  
Measurement Range ◽  
Pulp And Paper ◽  
Hydrodynamic Resistance ◽  
Experiment Planning ◽  
Straight Section ◽  
Local Resistance ◽  
Paper Production ◽  
Water Suspensions ◽  
Low Concentrations

The question of the features of operation of submersible vortex flowmeters of water and water suspensions of low concentrations in pulp and paper production, which are installed in process pipelines with local hydraulic resistance, is considered. It is shown that with an insufficient straight section after local resistance, an additional error appears, which appears due to the influence of local resistance (transition or retraction) on the symmetry of the velocity diagram in front of the device. This error arises due to a change in the Strouhal number (Sh) and is related to the measurement method. The Strouhal number begins to depend on both the distance to the local resistance and the fluid flow rate. Identify this relationship and is dedicated to this work. Recommendations on the length of straight pipeline sections in front of the flow meter have been developed, which can be significantly reduced by limiting the range of operating flow rates. The studies were carried out by the method of numerical simulation of hydrodynamic processes with subsequent processing of the results by the method of experiment planning. The dependence of the number Sh on the length of the relative diameter of the pipeline L/ for hydrodynamic resistance in the form of a transition is presented. This error shows that the measurement error is within 2% already with a straight section in front of the flowmeter equal to 5–7 diameters. The response surface for pipe bends (rotations) is considered at 90º from which it follows that while maintaining the length of the straight section within 5–7 pipe diameters, it is necessary to narrow the measurement range of the instruments 2.5 times.

A Study on Fiber Characteristics of Melocanna baccifera (Roxb.) Kurz for the Suitability of Pulp and Paper Production

2016 ◽  
Vol 39 (1) ◽  
pp. 27-30
Author(s):  
Shardesh Chaurasia ◽  
Satya Singh ◽  
Sanjay Naithani
Keyword(s):  
Pulp And Paper ◽  
Paper Production ◽  
Fiber Dimensions

Fiber dimensions of Melocanna baccifera was examined to assess their suitability for pulp and paper production. Fifty mature culms of M. baccifera were obtained from Forest of Silchar, Cachar District of Assam, India. Samples taken from the top, middle and basal portions were thoroughly mixed and used in the study.

Conclusion

2019 ◽  
pp. 283-286
Author(s):  
James Lindley Wilson
Keyword(s):  
The Other ◽  
Significant Part ◽  
Democratic Institutions ◽  
Social Equality ◽  
Equal Status ◽  
Democratic Practices ◽  
The Way

Democracy and equality are intimately linked. We cannot understand or properly respond to one ideal without the other. Democracy’s value stems in significant part from the way it manifests and sustains citizens’ equal status. Social equality requires democratic institutions and practices, because part of what it is for people to relate as equals is to share authority over what they do together. The design of democratic institutions—and our conduct of democratic practices—should be guided by this egalitarian ideal of sharing authority as civic friends. We ought to orient our efforts to establish and maintain equal relations with the democratic constituents of equality in view. We treat people as equals in part by sharing with them authority over how we treat one another. There is risk in granting authority to others. But a society of equals is a great reward....

Listening and Waiting, Excavating Later

2019 ◽  
pp. 177-201
Author(s):  
Peter R. Schmidt
Keyword(s):  
Indigenous Knowledge ◽  
Significant Part ◽  
Oral Traditions ◽  
Community Archaeology ◽  
Ritual Performance ◽  
Epistemic Humility ◽  
Iron Technology ◽  
The Way

Careful listening to oral traditions, a significant part of Tanzanian Haya heritage, for nearly a year led to an ancient shrine where Haya elders encouraged excavations. This was early participatory community archaeology, where indigenous knowledge and the initiative of elders paved the way to significant archaeological finds about iron technology and the enduring qualities of knowledge preserved by ritual performance. Patient apprenticeship to knowledge-keepers during ethnoarchaeological observations of iron technology also led to significant insights into inventive techniques in iron technology that otherwise would have gone unnoticed. Listening with epistemic humility, opening ourselves to other ways of constructing history and heritage, unveils heritage under treat. A forgotten massacre by German colonials, the knowledge of which has been erased by disease and globalization, was revealed and is now preserved only by listening closely to Haya elders five decades ago.

Understanding the Concert for Piano and Orchestra

2020 ◽  
pp. 402-436
Author(s):  
Martin Iddon ◽  
Philip Thomas
Keyword(s):  
Significant Part ◽  
Musical Form ◽  
Musical Work ◽  
The Way

This chapter considers the way in which the Concert for Piano and Orchestra has been interpreted by commentators, from musicologists and other composers to professional philosophical thinkers. It shows the way in which these interpretations played a part in the initial receptions of the piece, especially in Europe, made a major contribution to discussion of the nature of musical form in the context of openness, and became a significant part of later discussions regarding the nature and limits of the musical work.

Psychoanalysis and the Treatment of the Psychoses

1971 ◽  
Vol 119 (548) ◽  
pp. 47-52 ◽  
Author(s):  
Thomas Freeman
Keyword(s):  
United Kingdom ◽  
Significant Part ◽  
Psychiatric Practice ◽  
Psychotic Symptoms ◽  
Analytical Treatment ◽  
Classical Form ◽  
Mental Hospitals ◽  
The United Kingdom ◽  
The Subject ◽  
The Way

Psychoanalysis is not regarded as having a significant part to play in the treatment of the psychoses. This view has been strengthened by the ease with which the phenothiazine and other drugs may bring many psychotic symptoms under control. Nevertheless, there are psychiatrists who believe that psychoanalysis, in its classical form or suitably modified, can benefit patients suffering from psychoses. The issues which have been raised by these claims are still the subject of controversy among psychiatrists and psychoanalysts. This paper is not concerned with details of the different kinds of analytical treatment which may be recommended for patients. Such an account would be inappropriate in the circumstances of current psychiatric practice in the United Kingdom. Instead attention will be focused on the way in which psychoanalysis can be integrated into therapeutic regimes presently employed in mental hospitals.

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