Enhancement of biogas production in anaerobic co-digestion by ultrasonic pretreatment

Anaerobic Co-digestion of Pig Manure with Dried Maize Straw

“…In China, especially North China, most of the DMS is used as fertilizer or food for animals, and a large part is burned, which leads to a waste of resources and severe air pollution (Wang et al 2011). Several studies have shown that the co-digestion of maize straw (MS) with animal waste is an effective method of managing MS (Dinuccio et al 2010;Wang et al 2012b;Yangin-Gomec and Ozturk 2013;Arici and Koçar 2015;Zou et al 2016). However, the efficiency of integrating maize straw biomass into biogas production is very limited due to the resistance of its complex lignin structure to hydrolysis by bacteria (Jin et al 2014;Khatri et al 2015).…”

Ammonium Pretreatment and Addition Improve Stability of Environmental Parameters and Biogas Production under Anaerobic Co-digestion of Rice Straw and Dairy Manure

“…Thus, we concluded that the initial environment factors had influences on the stability of environmental factors. Because the environment factors characteristics (maximum value, minimum value and their appearance time) during AD system were affected by initial environment factors including substrate characteristics [22], pretreatment modes [21], initial liquid environment characteristics [3] that effected the stability of AD system. Although, the initial environment factors had positive effect or negative effect on the stability of environment factors in AD system, initial environment factors (the TOC content, RS content, VFA content, cellulase activity and pH) had the positive effect on the stability of DBP during AD process.…”

“…Anaerobic digestion (AD) usually refers to the microbial conversion of organic material to biogas, which mainly consists of methane and carbon dioxide, as a carbon-neutral alternative to fossil fuels whilst destroying pathogens and removing odors [2]. Thus, it has been used to alleviate the issues of environment pollution and energy crisis [3]. However, there are two factors limited AD.…”

Comparison of Ultrasonic and Hydrothermal Cavitation Pretreatments of Cattle Manure Mixed with Straw Wheat on Fermentative Biogas Production

“…For this reason, codigestion strategies with other organic waste and different pretreatments have been applied to enhance methane production [20][21][22]. Different researchers have studied the effects of UP on anaerobic digestion of cattle manure [13] and co-digestion of cattle manure with waste and sludge [23], with industrial meat-processing by-products [1], with crude glycerin [24]. They concluded that UP may improve the total biogas production via AD.…”

“…Physical pretreatment methods are the most commonly used due to low investment and operational convenience [13]. Ultrasonic pretreatment (UP) is a physical method, which disrupt the cell wall structure, increase the specific surface area and reduce the degree of polymerization by effect of compression and cavitation [6].…”