scholarly journals Anaerobic Biodegradability of Digestates – Influence of and Correlations for Klason lignin

2019 ◽  
Vol 43 (1) ◽  
pp. 39-46
Author(s):  
Torsten Mächtig ◽  
René Casaretto ◽  
Christian R. Moschner ◽  
Jens Born ◽  
Jens Bo Holm-Nielsen ◽  
...  
Keyword(s):  
Klason Lignin ◽  
Anaerobic Biodegradability

Does the kappa number method accurately reflect lignin content in nonwood pulps?

TAPPI Journal ◽  
2018 ◽  
Vol 17 (11) ◽  
pp. 611-617
Author(s):  
Sabrina Burkhardt
Keyword(s):  
Lignin Content ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Original Data ◽  
Kappa Number ◽  
Klason Lignin ◽  
Organic Functional Groups ◽  
Pulp Properties ◽  
Wood Pulps ◽  
Hexenuronic Acid

The traditional kappa number method was developed in 1960 as a way to more quickly determine the level of lignin remaining in a completed or in-progress pulp. A significantly faster approach than the Klason lignin procedure, the kappa number method is based on the reaction of a strong oxidizing agent (KMnO4) with lignin and small amounts of other organic functional groups present in the pulp, such as hexenuronic acid. While the usefulness of the kappa number for providing information about bleaching requirements and pulp properties has arguably transformed the pulp and paper industry, it has been mostly developed for kraft, sulfite, and soda wood pulps. Nonwood species have a different chemical makeup than hardwood or softwood sources. These chemical differ-ences can influence kappa and Klason measurements on the pulp and lead to wide ranges of error. Both original data from Sustainable Fiber Technologies’ sulfur and chlorine-free pulping process and kappa and Klason data from various nonwood pulp literature sources will be presented to challenge the assumption that the kappa number accurately represents lignin content in nonwood pulps.

Algal biomass anaerobic biodegradability

2012 ◽  
Vol 25 (3) ◽  
pp. 757-761 ◽  
Author(s):  
Bo Shi ◽  
Pete Lortscher ◽  
Doris Palfery
Keyword(s):  
Algal Biomass ◽  
Anaerobic Biodegradability

Insight into understanding the performance of electrochemical pretreatment on improving anaerobic biodegradability of yard waste

2021 ◽  
Vol 180 ◽  
pp. 1166-1178
Author(s):  
Sagarika Panigrahi ◽  
Hari Bhakta Sharma ◽  
Bikash Ranjan Tiwari ◽  
Nakka Vamsi Krishna ◽  
M.M. Ghangrekar ◽  
...  
Keyword(s):  
Yard Waste ◽  
Anaerobic Biodegradability ◽  
Electrochemical Pretreatment ◽  
Insight Into

scholarly journals Profiles of fatty acids and triacylglycerols and their influence on the anaerobic biodegradability of effluents from poultry slaughterhouse

2011 ◽  
Vol 102 (14) ◽  
pp. 7043-7050 ◽  
Author(s):  
A.B.G. Valladão ◽  
A.G. Torres ◽  
D.M.G. Freire ◽  
M.C. Cammarota
Keyword(s):  
Fatty Acids ◽  
Anaerobic Biodegradability

scholarly journals Comparison of the impacts of thermal pretreatment on waste activated sludge using aerobic and anaerobic digestion

2018 ◽  
Vol 78 (8) ◽  
pp. 1772-1781 ◽  
Author(s):  
Hyungjun (Brian) Jo ◽  
Wayne Parker ◽  
Peiman Kianmehr
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Oxygen Demand ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Decay Products ◽  
Anaerobic Biodegradability ◽  
Pretreatment Conditions ◽  
The Impact ◽  
Aerobic And Anaerobic

Abstract A range of thermal pretreatment conditions were used to evaluate the impact of high pressure thermal hydrolysis on the biodegradability of waste activated sludge (WAS) under aerobic and anaerobic conditions. It was found that pretreatment did not increase the overall extent to which WAS could be aerobically biodegraded. Thermal pretreatment transformed the biodegradable fraction of WAS (XH) to readily biodegradable chemical oxygen demand (COD) (SB) (16.5–34.6%) and slowly biodegradable COD (XB) (45.8–63.6%). The impact of pretreatment temperature and duration on WAS COD fractionation did not follow a consistent pattern as changes in COD solubilization did not correspond to the observed generation of SB through pretreatment. The pretreated WAS (PWAS) COD fractionations determined from aerobic respirometry were employed in anaerobic modeling and it was concluded that the aerobic and anaerobic biodegradability of PWAS differed. It was found that thermal pretreatment resulted in as much as 50% of the endogenous decay products becoming biodegradable in anaerobic digestion. Overall, it was concluded that the COD fractionation that was developed based upon the aerobic respirometry was valid. However, it was necessary to implement a first-order decay process that reflected changes in the anaerobic biodegradability of the endogenous products through pretreatment.

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