Abstract
Nanoscale zero-valent iron(NZVI) was prepared with a method of reduction in liquid phase by the reaction of FeSO4 and NaBH4, and characterized by SEM. This study investigated the effect of different concentration of NZVI on biogas production and methane content during the anaerobic digestion process at the medium temperature of 35°C. The results indicated that the group with 1000mg/L NZVI maintained ammonia at the level of 600–800mg/L, pH between 6.5-8.0, and improved CODcr degradation rates at 2.91%; this concentration of NZVI produced maximum concentration of VFAs, which can reach 3846mg/L, and strengthen the use of acetic acid. Relative to the control group, the system increased cumulative biogas production of 18.11%, decreased biogas production cycles of three days and increased the methane content by 6.93%.
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