Effect of Applying Organic Amendments on the Pyrolytic Behavior of a Poplar Energy Crop

Producción CientíficaThermal conversion of biomass derived from energy crops is one alternative for the production of energy. In this work, thermogravimetric analysis of poplar biomass was carried out and both the kinetic parameters (activation energy and frequency factor) and characteristic indexes were determined. Four poplar clones (UNAL, I-214, AF-2 and AF-8) under no fertilization (CONTROL) or under fertilization with either dehydrated composted sewage sludge (BIOSOLIDS) or sludge from dairy wastewater treatment (MUD) were used in this work. Five weight loss stages were identified in the DTG pyrolysis curves: moisture loss, active pyrolysis (two phases), passive pyrolysis and a high-rank pyrolysis phase. Among them, the second pyrolysis active phase was the most representative one. For this stage, BIOSOLIDS-UNAL poplars biomass was the one that achieved the highest weight loss values. The characteristic parameters and indexes (especially P and Pi indexes) also pointed to UNAL poplars under BIOSOLIDS fertilization as the most favourable for pyrolytic thermal conversion

Pretreatment and enzymatic hydrolysis of lignocellulosic biomass for reducing sugar production

Conversion of lignocellulosic biomass into reducing sugar has contributed to an alternative use of lignocellulose source, especially in the production of value-added products such as amino acids, biofuels, and vitamins. In the bioconversion process, pretreatment of lignocellulosic biomass is important to enhance the accessibility of enzyme hydrolysis, thus increasing the yield of reducing sugar. Lignocellulosic biomass has a very complex arrangement of structure that needs a proper study in pretreatment and enzymatic hydrolysis process to obtain an optimum yield of reducing sugar. This chapter discusses chemical and enzymatic pretreatment methods that are commonly applied to effectively modify the chemical structures of lignocellulosic biomass. Acid pretreatment using dilute sulfuric acid (H2SO4) is the most commonly employed for chemical pretreatment while sodium hydroxide (NaOH) is the most commonly applied for alkaline pretreatment because of its ability to delignify biomass. Then, enzymatic hydrolysis of lignocellulosic biomass for the production of reducing sugar is discussed in detail. The kinetics and optimization of hydrolysis which are the key parameters that determine the yields of reducing sugar are also presented. The right pretreatment method combined with an efficient hydrolysis process will ensure successful conversion of lignocellulosic biomass into reducing sugar, thus providing a sustainable production of reducing sugar from biomass for various applications