Biological Post-Treatment of Anaerobically-Treated Black Liquor Spills from Kraft Pulp-Mill

2020 ◽  
pp. 493-503
Author(s):  
C. Estrada-Vázquez ◽  
R. Hernández-Vera ◽  
I. Magaña-Plaza ◽  
A. Hernández-González ◽  
H. M. Poggi-Varaldo ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Black Liquor ◽  
Pulp Mill ◽  
Post Treatment ◽  
Kraft Pulp Mill

Effects of integrating a bioethanol production process to a kraft pulp mill

2010 ◽  
Vol 25 (2) ◽  
pp. 233-242 ◽  
Author(s):  
Jesse Kautto ◽  
Kaj Henricson ◽  
Herbert Sixta ◽  
Mikaela Trogen ◽  
Raimo Alén
Keyword(s):  
Production Process ◽  
Ethanol Production ◽  
Kraft Pulp ◽  
Black Liquor ◽  
Pulp Mill ◽  
Simulation Software ◽  
Kraft Pulp Mill ◽  
Excess Power ◽  
Energy Balances ◽  
Wood Consumption

Abstract The integration of an ethanol production process based on prehydrolysis of softwood chips to a kraft pulp mill is discussed. A simulation model of this biorefinery has been created with WinGEMS simulation software to calculate the mass and energy balances of the biorefinery and to examine the effects of the integration on the operation of the pulp mill. Integrating the prehydrolysis process to the modeled pulp mill producing 1000 Adt/day of pine pulp would increase the wood consumption by 16%. With the increased wood consumption, 40 t/day of ethanol could be produced, and the excess power production could be increased by 460 MWh/day. The integration of the ethanol production process to a pulp mill would have considerable effects on the operation of the pulp mill. The coupling of hydrolyzate evaporation with black liquor evaporation would require major modifications in the evaporation plant. Due to the burning of organic residue from the ethanol process and to the increase in the heating value of black liquor, the load on the recovery boiler would increase by 31%.

scholarly journals Effect of polysulfide pulping process on the energy balance of softwood and hardwood kraft pulp mills

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Satu Lipiäinen ◽  
Katja Kuparinen ◽  
Esa Vakkilainen
Keyword(s):  
Kraft Pulp ◽  
Energy Use ◽  
Process Development ◽  
Black Liquor ◽  
Pulp Mill ◽  
Electricity Production ◽  
Pulp Yield ◽  
Pulp Mills ◽  
Kraft Pulp Mill ◽  
Kraft Pulp Mills

Abstract Polysulfide pulping is a method to increase the pulp yield in a kraft pulp mill. Higher production is in the core of pulp mill process development, but modifications in cooking raise questions on their effects on the other parts of the process. This study focuses on the impacts of polysulfide pulping on the energy use and production of kraft pulp mills. The impacts are estimated by calculating and analyzing the steam and electricity balances of reference softwood and hardwood mills. Energy generation using residual biomass is an essential part of the operation of a kraft pulp mill, and often a notable source of income. The results show that implementation of polysulfide cooking affects both energy consumption and production. Higher hemicelluloses content of pulp cooked using polysulfide liquor means that less organic material ends up in the black liquor. Subsequently, the recovery boiler energy production suffers. The reduced steam production together with increased steam consumption decreased electricity production, corresponding to a decline in sellable electricity of 22.4 % in the hardwood mill and 28.4 % in the softwood mill. The study shows that increasing the pulp production by investing in polysulfide cooking in stand-alone kraft pulp mills can be economically feasible.

Modeling of the Solubility of Different Inorganic Sodium Salts in Black Liquor Under Varying Conditions

TAPPI Journal ◽  
2009 ◽  
Vol 8 (3) ◽  
pp. 9-13 ◽  
Author(s):  
RICKARD WADSBORN ◽  
RUNE RÅDESTRÖM
Keyword(s):  
Ionic Strength ◽  
Kraft Pulp ◽  
Black Liquor ◽  
Pulp Mill ◽  
High Ionic Strength ◽  
Chemical Model ◽  
Interaction Theory ◽  
Sodium Salts ◽  
Kraft Pulp Mill

To create a model for predicting the solubility of burkeite and related sodium salts in the evaporation train of a kraft pulp mill, we conducted experiments covering the precipitation of burkeite (Na2CO3·2Na2SO4) and dicarbonate (2Na2CO3·Na2SO4). Results from the experiments were implemented in a chemical model that used the Pitzer ion-interaction theory to describe the activity factors of the constituting ions in solution at high ionic strength.

Formation and degradation of mutagens in kraft pulp mill water systems

1990 ◽  
Vol 5 (3) ◽  
pp. 142-147 ◽  
Author(s):  
Annika Smeds ◽  
Bjarne Holmbom ◽  
Åbo Akademi ◽  
Leena Tikkanen
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Water Systems ◽  
Kraft Pulp Mill

Occurrence of Various Off-Flavours in Fish in Finland from 1969 to 1981

1983 ◽  
Vol 15 (6-7) ◽  
pp. 47-58 ◽  
Author(s):  
T Kuusi ◽  
M Suihko
Keyword(s):  
Research Laboratory ◽  
Kraft Pulp ◽  
Pulp Mill ◽  
Northern Pike ◽  
Research Centre ◽  
Pulp Mill Effluent ◽  
Technical Research ◽  
Kraft Pulp Mill ◽  
Food Research ◽  
Numerical Scale

Off-flavours in fish were studied from 1969 to 1981 at the Food Research Laboratory of the Technical Research Centre of Finland using sensory methods. In all, 1982 samples of 18 species of Finnish fish, most of them suspected of being tainted, were studied. A trained taste panel scoring on a numerical scale of 0-10, where a score of 5 or less was unacceptable, was used. The off-flavours described were oil, kraft pulp mill effluent, sewage (musty), muddy, rancid, and others. Of all these samples, 34.9% were unacceptable. The most common off-flavour was kraft pulp mill effluent, present in 41.2 % of the unacceptable samples. In acceptable fish slight off-flavours were somet imes found. Of the muddy fish, only 35.2 % of the bream and 28.8 % of the northern pike were unacceptable. The panel was able to discriminate between the different off-flavours, but, in some cases, the boundaries were vague.

Characterization of odorous compounds from bleached kraft pulp mill effluent

1995 ◽  
Vol 31 (11) ◽  
pp. 35-40 ◽  
Author(s):  
B. G. Brownlee ◽  
S. L. Kenefick ◽  
G. A. MacInnis ◽  
S. E. Hrudey
Keyword(s):  
Gas Chromatography ◽  
Kraft Pulp ◽  
Pulp Mill ◽  
Dimethyl Disulfide ◽  
Gas Chromatography Mass Spectrometry ◽  
Pulp Mill Effluent ◽  
Kraft Pulp Mill ◽  
Bleached Kraft Pulp ◽  
Methyl Phenyl Sulfide ◽  
Library Spectrum

Odour compounds in extracts of bleached kraft pulp mill effluent (BKME) have been characterized by olfactory gas chromatography (OGC) and gas chromatography-mass spectrometry. A variety of sulfury odours was detected by OGC in addition to woody and pulp mill-like odours. Three sulfur compounds were identified by comparison of retention times and partial mass spectra with authentic standards: dimethyl disulfide, 3-methylthiophene and thioanisole (methyl phenyl sulfide). Typical concentrations in BKME were 1, 0.05, and 0.5 μg/l, respectively. Their odour intensity is relatively low and they were not detected by OGC. Dimethyl trisulfide was tentatively identified by comparison of its partial mass spectrum with a literature (library) spectrum. Its concentration in BKME was estimated at 0.5-2 μg/l. It corresponded to a skunky odour in the OGC profiles. Efforts to identify another odour peak, eluting just after 3-methylthiophene, with a pronounced alkyl sulfide odour were unsuccessful.

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