Anaerobic digestion of pig and dairy manure under photo-dark fermentation condition

Anaerobic co-digestion of kitchen waste and pig manure with different mixing ratios

“…PM is also a kind of commonly used material for anaerobic digestion which is rich in nitrogen and could reach a high level of ammonia nitrogen in an anaerobic digester (19,20). A high ammonia nitrogen concentration would easily cause an increase of pH over 8.0 and then be an inhibition to methane production, and it was reported mainly because of the free ammonia which was decided by three parameters (total ammonia concentration, temperature and pH) (21).…”

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

“…Previous study has shown that pretreatment improve the stability of AD system to enhance the TBP [51], but its measurements were the suitable ranges of environment factors during AD process, such as VFA content, alkalinity, ammonium nitrogen content, which were used by previous study to explain the relationship between stability of AD system and TBP. Moreover, Yin [52] showed that the environment factors during AD process had direct and indirect influences on the TBP, and the pH had the most effect on TBP, which different from this result. Because the pH was the values that appeared in the AD process, while they were the CVs of pH in this study.…”

“…Thus, the total organic carbon (TOC), reducing sugar and VFA were the keys carbon sources in the three stages in AD process. The growth rate of microorganisms was significantly affected by pH changing [10], because a significant positive correlation (P<0.01) was found between hydrolysis rate and pH [11], Yin et al [12] also showed that pH displayed the maximum comprehensive influence with total biogas production (TBP) in AD. Cellulase activity can ensure the optimal growth and activity of various types of microorganisms, therefore, biomass can be more resistant to shock loading [13].…”

Microbial Community Characteristics of a High Solid Content Anaerobic Digester of Municipal Solid Waste

“…Anaerobic fermentation of high solid content waste is becoming a research focus. Several factors affect the dry fermentation process for biogas production, such as pH, ammonia inhibition, and the microbial community (Yin et al, 2014). Controlling the microbial community in particular could affect the efficiency of biogas production (El-Mashad et al, 2008; Eikmeyer et al, 2013; Kovács et al, 2013).…”