Enhanced Biogas and Biohydrogen Production from Cotton Plant Wastes Using Alkaline Pretreatment

Abstract

Enhancement of biogas and biohydrogen production from cotton plant wastes (stalk and boll) was investigated in the current work. This was achieved using alkaline pretreatment by sodium hydroxide solution of 8% (w/w) concentration at 0 and 100 °C for 10, 30, and 60 min, together with ammonia solution of 4 and 8% (w/w) concentrations at 40 and 80 °C for 6 and 12 h. Maximum biogas production values of 246 and 219 mL/g volatile solids (VS) were achieved respectively from boll pretreated by sodium hydroxide 8% (w/w) at 100 °C for 10 min and stalk pretreated by ammonia solution 4% (w/w) at 80 °C for 12 h. Sodium hydroxide-pretreated boll and ammonia solution-pretreated stalk, under conditions similar to those leading to the maximum methane production, gave maximal hydrogen production values of 17 and 15.2 mL/g VS, respectively. The results of hydrogen production in this study showed satisfactory agreement with the Gompertz equation. Structural analysis of the samples using scanning electron microscopy and Fourier transform infrared spectroscopy established that the reduction of crystallinity, lignin removal, and increase in porosity of the pretreated samples were the main reasons behind these observations.

Influência do uso de inóculo na estimativa de gás metano dos resíduos orgânicos do aterro sanitário dos municipios do agreste alagoano

“…O modelo de Gompertz modificado é o mais utilizado para descrever o progresso da produção cumulativa de metano em experimentos em batelada, relacionando-a com o crescimento e o metabolismo microbiano (Ghasemian et al, 2016) A produção acumulada de metano ao longo do tempo de operação de cada amostra (com e sem inóculo), ajustada ao modelo de Gompertz modificado, podem ser vistas nos gráficos das Figuras 5 e 6. A comparação entre os volumes acumulados dos reatores com e sem inóculo podem ser vistos na Figura 7.…”

“…Potencial de produção de metano (mL) Segundo Ghasemian, et al, (2016), o modelo de Gompertz modificado pode ser considerado eficaz no ajuste dos dados experimentais se todas as análises apresentarem coeficientes de determinação ajustados (R 2 ) maiores que 0,95. As curvas dos reatores com e sem inóculo atenderam a esse requisito.…”

An Economical Method for Simultaneously Improving Pretreatment and Anaerobic Fermentation Effects on Corn Straw Using Ultra-Low Concentration FeCl2

“…At present, many kinds of pretreatment methods have been tested, including dilute acid [7,8], alkaline [9,10], liquid hot water [11,12], steam explosion [13,14], ionic liquid [15,16], and so on. Among these methods, dilute acid is considered low-cost for lignocellulose conversion, which can significantly enhance xylose yields from hemicellulose and expose cellulose to enzymes for high yields from subsequent hydrolysis [17][18][19][20].…”

Carbohydrate and Amino Acid Profiles of Cotton Plant Biomass Products

“…Thus, our main idea is that cotton may provide valuable amounts of residues that require a careful characterization. Indeed, amino acids and carbohydrates are important components of plant biomass and other natural materials [19][20][21][22][23]. Previously, we explored their contents in cottonseed and its derived products [24,25].…”