The anaerobic digestion (AD) system with vegetable waste (VW) as substrate for easy acidification was always operated under low organic loading rate (OLR) with low volumetric methane production rate (VMPR) and then it would result in low efficiency of digester. In this study, continuous AD of VW was carried out in the self-designed 70 L anaerobic reactors under mesophilic conditions (35oC). The trace elements (TE) supplementation was based on the decreasing CH4 content in order to stabilize the process of high OLR for long run-length. When the AD process ran at OLR 2.0 g VS/(L•d) with the CH4 content rapidly decreased from 50% to 40%, through the TE supplementation of 5 days, the CH4 content could quickly return to the stable state 50% ~ 55% from 40%, and VMPR increased from 0.38 L/(L•d) to the stable state of 0.6 L/(L•d). Meanwhile, pH rose from 7.21 to 7.4 and ORP decreased from −509 mV to −530 mV. When the AD process ran at the 20th day of OLR 3.0 g VS/(L•d) after 83 days of the first TE supplementation, the CH4 content decreased from 58.9% to 53.4% again, and then after the TE supplementation of 3 days, the CH4 content could maintain at above 55%. The TE supplementation can effectively improve the OLR and VMPR and stabilize the AD process to increase the utilization of raw materials.
SUN Juan
,
LI Dong
,
ZHENG Tao
,
LIU Xiao-feng
. Control of Trace Elements on Anaerobic Digestion of Vegetable Waste[J]. Advances in New and Renewable Energy, 2018
, 6(1)
: 21
-25
.
DOI: 10.3969/j.issn.2095-560X.2018.01.004
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