TY - JOUR
T1 - Influence of zero valent scrap iron (ZVSI) supply on methane production from waste activated sludge
AU - Zhen, Guangyin
AU - Lu, Xueqin
AU - Li, Yu You
AU - Liu, Yuan
AU - Zhao, Youcai
N1 - Funding Information:
The authors wish to thank the Japan Society for Promotion of Science ( JSPS, ID No. PU 14016 ) and China Scholarship Council (CSC, File No. 201306890003) for partial support of this study.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - The use potential of zero valent scrap iron (ZVSI) for promoting anaerobic production of waste activated sludge (WAS) was assessed. The results indicated that the presence of ZVSI effectively enhanced WAS methane production. Methane yield reached the maximum of 174.9±1.5mL/gVSSfed with addition of 1.0g-ZVSI/gVSS, increasing by 38.3%. The corresponding values for sludge hydrolysis (%H), acidogenesis (%A), and methanogenesis rate (%M) increased into 52.6±0.4%, 44.5±2.9% and 40.8±0.3%, respectively, versus 45.2±0.5%, 40.9±2.0% and 29.5±0.2% in the test without ZVSI. Further investigations confirmed that ZVSI could offer electrons (H2/[H]), promote H2 consumption and afford beneficial pH environment for WAS digestion, which stimulated the metabolisms of critical microbes involved in the process and, subsequently accelerated the hydrolysis-acidification-methanation steps of WAS. As a result of this, methane production was upgraded. The superior ability of ZVSI to serve as a source of electron donors will open a new door for WAS treatment. Moreover, ZVSI is less expensive, and convenient to use, providing a cost-efficient alternative for simultaneous energy recovery along with waste iron scrap conservation.
AB - The use potential of zero valent scrap iron (ZVSI) for promoting anaerobic production of waste activated sludge (WAS) was assessed. The results indicated that the presence of ZVSI effectively enhanced WAS methane production. Methane yield reached the maximum of 174.9±1.5mL/gVSSfed with addition of 1.0g-ZVSI/gVSS, increasing by 38.3%. The corresponding values for sludge hydrolysis (%H), acidogenesis (%A), and methanogenesis rate (%M) increased into 52.6±0.4%, 44.5±2.9% and 40.8±0.3%, respectively, versus 45.2±0.5%, 40.9±2.0% and 29.5±0.2% in the test without ZVSI. Further investigations confirmed that ZVSI could offer electrons (H2/[H]), promote H2 consumption and afford beneficial pH environment for WAS digestion, which stimulated the metabolisms of critical microbes involved in the process and, subsequently accelerated the hydrolysis-acidification-methanation steps of WAS. As a result of this, methane production was upgraded. The superior ability of ZVSI to serve as a source of electron donors will open a new door for WAS treatment. Moreover, ZVSI is less expensive, and convenient to use, providing a cost-efficient alternative for simultaneous energy recovery along with waste iron scrap conservation.
KW - Anaerobic digestion
KW - Methane production
KW - Waste activated sludge
KW - Zero valent scrap iron (ZVSI)
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U2 - 10.1016/j.cej.2014.11.003
DO - 10.1016/j.cej.2014.11.003
M3 - Article
AN - SCOPUS:84916894934
SN - 1385-8947
VL - 263
SP - 461
EP - 470
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -