Improvement of Biogas Production in the Anaerobic Digestion of Pig Manure by Using Goethite and Magnesia
A mineral-organism coexistence system was built by adding goethite and magnesia into the anaerobic fermentation reaction to study the effect of mineral additive on anaerobic digestion.pH of the fermentation liquor, CO2, CH4 and H2S gas production were measured.XRD and SEM analysis was also performed for the determination of residue ingredients.The results showed that, comparing with the control group, CH4 production and CI4 concentration of the mineral group increased by 338.25% and 120% respectively, and the H2S concentration reduced by about 60%.Magnesia could neutralize the acids generated in the anaerobic fermentation process to keep the reaction system stable in weak alkalinity, which was in favor of fixing nitrogen and phosphate as struvite precipitation.Phosphate removal efficiency achieved 92 %, and the immobilization of ammonia nitrogen was subject to the orthophosphate content within the solution.XRD and SEM analysis revealed that, high-Mg calcite was formed in addition to calcite precipitation in the mineral group, and it provided another way to immobilize the CO2, consequently increasing the relative content of CH4 in biogas.Iron ion released from reductive decomposition of goethite could be beneficial for synthesizing key enzymes in microbial body, thereby promoting the anaerobic reaction.The joint addition of goethite and magnesia not only increased the CH4 production, fixed the C, S, N and P in biogas slurry, but also enhanced the biogas quality by reducing H2S, so it offered a new technical approach to improve the energy conversion efficiency of anaerobic fermentation.
pig manure anaerobic fermentation immobilization of C S N and P struvite
Dianchao Kong Tianhu Chen Jin Wang Dunfan Yao Zhengbo Yue Yuefei Zhou Xianyang Gui Xinmin Zhan
School of Resources & Environmental Engineering,Hefei University of Technology,Hefei,230009 China Civil Engineering,College of Engineering and Informatics,National University of Ireland,Galway,Irela
国际会议
浙江嘉兴
英文
137-142
2013-10-24（万方平台首次上网日期，不代表论文的发表时间）