Co-cooking moso bamboo with hardwoods

TAPPI Journal ◽  
2014 ◽  
Vol 13 (6) ◽  
pp. 9-15 ◽  
Author(s):  
TROY RUNGE ◽  
JACKIE HEINRICHER ◽  
DAN MEIER

Bamboo is one of the world’s fastest growing feedstocks and represents a promising nonwood resource that can be utilized in the pulp and paper industry. The timber varieties offer low feedstock costs, can be processed similarly to trees from a logistics standpoint, and have useful fiber properties for papermaking. Plantations have not yet been established due to propagation costs, limiting adoption of bamboo as a pulp feedstock to smaller pulp mills primarily in China, where there are native forests. Recent advances in micropropagation may allow lower establishment costs, but gradual introduction into the supply chain will be required. One concept is to gradually include bamboo feedstock into an established pulp mill as plantations are established, using co-cooking with a wood species. Previous work has shown that bamboo cooks fairly easily using the kraft process with conditions similar to hardwood species.

TAPPI Journal ◽  
2021 ◽  
Vol 20 (10) ◽  
pp. 655-662
Author(s):  
FLAVIO PAOLIELLO

Several reports of accidents involving serious mechanical failures of sootblower lances in chemical recovery boilers are known in the pulp and paper industry. These accidents mainly consisted of detachment and ejection of the lance tip, or even of the entire lance, to the inside of the furnace, towards the opposite wall. At least one of these cases known to the author resulted in a smelt-water explosion in the boiler. In other events, appreciable damage or near-miss conditions have already been experienced. The risk of catastrophic consequences of the eventual detachment of the lance tip or the complete lance of a recovery boiler soot-blower has caught the attention of manufacturers, who have adjusted their quality procedures, but this risk also needs to be carefully considered by the technical staff at pulp mills and in industry committees. This paper briefly describes the failure mechanisms that prevailed in past accidents, while recommending inspection and quality control policies to be applied in order to prevent further occurrences of these dangerous and costly component failures. Digital radiography, in conjunction with other well known inspection techniques, appears to be an effective means to ensure the integrity of sootblower lances in chemical recovery boilers used in the pulp and paper industry.


2010 ◽  
Vol 62 (10) ◽  
pp. 2364-2371 ◽  
Author(s):  
M. Sandberg

More than 50% of the electrical power needed to treat pulp and paper industry effluents is used for aeration in biological treatment stages. A large share of the oxygen that passes through the wastewater is not consumed and will be found in the off-gas. Energy can be saved by aerating under conditions where the oxygen transfer is most efficient, for example at low concentrations of dissolved oxygen Consider the sludge as an energy source; electricity can be saved by avoiding sludge reduction through prolonged aeration. High oxygen transfer efficiency can be retained by using the oxygen consumption of biosolids. Quantified savings in the form of needed volumes of air while still achieving sufficient COD reduction are presented. The tests have been made in a bubble column with pulp mill process water and sludge from a biological treatment plant. These were supplemented with case studies at three pulp and paper mills.


2021 ◽  
Vol 75 (9) ◽  
pp. 780-787
Author(s):  
Gilles Sagorin ◽  
Emmanuel Cazeils ◽  
Jean-François Basset ◽  
Maud Reiter

CST (Crude Sulfate Turpentine) is an upcycled, biomass raw material derived from pinewood, obtained as a by-product of the Kraft process from the pulp and paper industry. The current article provides an overview of major renewable perfumery ingredients obtained from CST-derived alpha- and beta-pinene to-date and part of the Firmenich manufacturing portfolio, post DRT acquisition.


1990 ◽  
Vol 22 (9) ◽  
pp. 199-206
Author(s):  
J. Junna ◽  
J. Rintala

Since 1984, when the first activated sludge treatment plant (ASTP) was built to treat pulp and paper industry wastewaters in Finland, twenty more plants have been introduced by 1989. An evaluation was undertaken to find out the actual performance of the ASTPs in BOD7, CODc r and phosphorus removal. The evaluation included all the 12 ASTPs in operation in the pulp and paper industry at the beginning of 1987. The highest average BOD7 removals were about 90 % at pulp mills as well as paper and board mills. CODc r removal was generally higher at paper and board mills (about 40-70 %) than at pulp mills (about 25-55 %). Phosphorus was added to wastewater in most plants. In some ASTPs, phosphorus concentrations were lowered by 20-40 % compared with wastewater from the mill. In some plants phosphorus load on the recipient was higher than the load coming from the mill. In treated wastewater, correlations between suspended solids and BOD7, CODc r, phosphorus and nitrogen were significant in most plants. This indicated that low removal efficiencies resulted from poor suspended solids removal in the secondary clarification. Volumetric and sludge CODc r loading rates could not explain removal efficiencies when all plants were included in the comparison. In plants treating chemical pulping effluents, higher removal efficiencies were normally achieved with lower loading rates. When the plants were studied separately, the influence of loading rate was generally significant.


2017 ◽  
Vol 7 (01) ◽  
Author(s):  
Krisna Septiningrum ◽  
Ikhwan Pramuaji

This review introduce about biotechnological application of enzyme in pulp and paper industry. These enzymes can be applied as biological agents in biopulping, biobleaching including Hexenuronic acid (HexA) removal. Degrading enzyme from white rot fungi, xylanase, laccase, lipase and α-glucuronidase are the the most applicable enzyme in the process. Nowadays, enzyme application is still under laboratory scale, only a few is applied further until industrial scale. There are some limitations for further application related with technical aspects such as effectivity of the enzyme during its application comparing with chemical compounds, enzyme availability in the market, enzyme characteristic that appropriate with the process in pulp mill and economical aspect. In the other hand, these technologies also provide some advantages such as reduce energy consumption, reduce or substitute chemicals and more environmental friendly ABSTRAK Kajian ini berisi mengenai aplikasi bioteknologi terutama enzim di industri pulp dan kertas. Enzim ini dapat diaplikasikan pada proses pulping, biobleaching termasuk penghilangan Hexenuronic acid (HexA). Enzim dari jamur pelapuk putih, xilanase, lakase, lipase dan α-glucuronidase merupakan enzim yang penting untuk diaplikasikan pada proses-proses tersebut. Aplikasi enzim saat ini masih dalam skala laboratorium, hanya beberapa diterapkan lebih lanjut sampai skala industri. Beberapa keterbatasan untuk aplikasi lebih lanjut terkait dengan aspek teknis adalah efektivitas enzim yang lebih rendah jika dibandingkan dengan bahan kimia, keterbatasan produk enzim yang ada di pasar khususnya karakteristik enzim yang sesuai untuk industri pulp, dan keterbatasan dari aspek ekonomi. Namun di satu sisi, teknologi ini juga diketahui memiliki beberapa kelebihan seperti dapat mengurangi penggunaan energi, mengurangi atau substitusi bahan kimia, dan lebih ramah lingkungan


1996 ◽  
Vol 1 (4) ◽  
pp. 379-401 ◽  
Author(s):  
David A. Sonnenfeld

This paper analyzes how a key conflict in Australia's pulp and paper industry became generalized to other sites through environmental action, government regulation, and industry initiative. From 1987–91, Australians debated construction of a new, world-class, export-oriented pulp mill in Tasmania. Rural residents, fishermen, and environmentalists, allied with the Australian Labor Party, succeeded in scuttling the project. Subsequently, the national government launched a major research program, state governments tightened regulations, and industry reduced elemental chlorine use. Any new mills constructed in Australia today would be among the cleanest in the world. This paper is part of a larger, comparative study of technological innovation in the pulp and paper industries of Australia, Indonesia, Malaysia, and Thailand. The author interviewed industry officials, government regulators, research scientists, and environmentalists; visited pulp and paper mills; attended technical conferences; and conducted archival work in these countries during a 12-month period.


1991 ◽  
Vol 24 (3-4) ◽  
pp. 319-329 ◽  
Author(s):  
M. Almemark ◽  
G. Finnveden ◽  
B. Frostell

Literature data and results from current Swedish research have been used to compile characteristics of and disposal methods for sludges and concentrates from external treatment of wastewaters from the pulp and paper industry. Very little sludge from aerobic lagoon treatment in Sweden is handled, and most of the solids are deposited in the receiving waters. In North America, Finland and Japan, where activated sludge treatment is used to a great extent, sludge handling is an important part of kraft mill effluent treatment. Typically, 5-15 kg of dry solids has to be handled per ton of pulp with a process discharge of 15-20 kg of BOD5/t90- For chemical coagulation, the amounts of sludges produced are higher, typically 40-80 kg dry solids/t90. Especially in Japan, chemical coagulation is used to a great extent. Laboratory and pilot- plant experiments with Ultrafiltration of alkaline stage and total bleach plant effluents suggest that concentrates with a total solids content of approximately 20 and 50 kg dry solids/t90 are produced. The concentrations of organochlorine compounds in sludges and concentrates have not hitherto been well documented, and nor have environmental effects of different disposal methods. Chlorinated phenols, catechols and guaiacols have been found in variable concentrations; chlorinated dibenzodioxins and furans have also been detected. Vacuum filters and especially belt filter presses have been used to dewater sludges. Typical dry solids concentrations achieved vary from 20-35 % for primary sludges to 15-20 % for secondary sludges. Anaerobic digestion may be applied before dewatering of sludges, and methane yields of 200-400 1 CH4/kg VSrem have been reported. Sludge has been disposed of in landfills or incinerated. Leachates from landfilling of pulp and paper industry sludges may contain high levels of soluble organic material, but available information suggests that organochlorine compounds do not leach to a substantial extent. Incineration of pulp mill sludges and concentrates seems to be an increasingly attractive method.


1992 ◽  
Vol 68 (4) ◽  
pp. 492-495
Author(s):  
P. K. Owusu–Gyima ◽  
D. N. Roy

This paper reviews the risk potential of pulp mill pollutants to humans, risk abatement strategies adopted by the pulp and paper industry, and their socio-enviro-economic implications.The deleterious impact of dioxin-exposure on experimental animals is well documented worldwide. Though their impact on humans is yet to be assessed, it is part of today's conventional widsom that the reduction and possible elimination of the major sources of dioxin would be, pragmatically and economically, more environmentally acceptable. Key words: Dioxin, furan, PCDDs, PCDFs, bleaching, paper and pulp, oxygen, bleach, BOD, COD, wood.


Author(s):  
Nancy Langston

How did the pulp and paper industry—an industry that was intended to solve rather than create environmental problems in the Lake Superior basin—become the source of the region’s greatest pollution problems? As trees grew back on cutover lands, a new industry developed to exploit them. Aquatic pollution from the industry created a new set of pollution challenges that soon dwarfed the conservation problems presented by the lumber industry. Pulp mills and regulators tried to manage pollution from growing industries, but their models did not account for the complexity of nearshore habitats, limnological conditions, bumpy shore bottoms, shoals that catch currents carrying sediments, or fish with minds of their own.


1996 ◽  
Vol 29 (3) ◽  
pp. 469-496 ◽  
Author(s):  
Kathryn Harrison

AbstractThe disclosure in 1987 that dioxins were present in pulp mill effluents prompted governments throughout the world to revise their environmental standards for the pulp and paper industry. This article uses the pulp and paper case to examine the dynamics of environmental standard setting within the Canadian federal state. Provincial regulatory incentives are analyzed using two-player games as a heuristic. The article then considers the federal government's role in establishing national standards. Many authors have emphasized the importance of federal involvement to overcome provincial reluctance to regulate unilaterally, lest jobs be lost to jurisdictions with weaker environmental standards. However, few have considered whether the federal government has incentives to do just that. It is argued that those incentives are weak at best, in light of resistance from both the regulated industry and jurisdictionally defensive provinces. In environmental regulation of the Canadian pulp and paper industry, federal reluctance resulted in a two-tier system of environmental standards with strict standards for the largest provinces, and weaker ones for smaller provinces that rely more on the federal government.


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