ef9b02498_si_001.pdf (417.24 kB)
Enhanced Anaerobic Digestion of Swine Manure by the Addition of Zero-Valent Iron
journal contribution
posted on 2019-11-14, 14:39 authored by Yuan Yang, Jianyu Wang, Yanbo ZhouZero-valent iron (ZVI) supplementation and two-stage
anaerobic
digestion are the enhanced ways for CH4 production in anaerobic
treatment to convert organic wastes into renewable energy. In this
study, different ZVI supplementation modes were applied during the
acidogenic stage or methanogenic stage in swine manure anaerobic digestion.
Adding ZVI in the acidogenic stage can increase the pH and improve
volatile fatty acid production by 16.5%; ZVI addition in the methanogenic
stage is more beneficial for CH4 production than in the
acidogenic stage. The results show that adding ZVI at both the acidogenic
stage and methanogenic stage could achieve 27.3% CH4 yield
higher than that of control. The microbial sequencing analysis showed
that ZVI supplementation could enrich hydrogenotrophic Methanomassiliicoccus by 39.2–92.0%. Results
from this study demonstrated that ZVI could be added to contact directly
with methanogens in order to achieve higher energy recovery from animal
manure.