Journal
WASTE MANAGEMENT
Volume 118, Issue -, Pages 452-462Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.08.021
Keywords
High solid anaerobic digestion; Ammonia inhibition; Propionate; Zero-valent iron; Microbial community; Methanosarcina
Categories
Funding
- National Key Research & Development Plan Programme of China [2016YFD0501405]
- National Natural Science Foundation of China [21677161]
- Key Research & Development Plan Programme of Jiangxi Province, China [20171ACG70018]
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Relieving from ammonia inhibition and enhancing the utilization of thermodynamically unfavorable propionate are crucial for methane harvest in the high solid anaerobic digestion (HSAD) of ammonia-rich swine manure. In this study, the potential of dosing zero-valent iron (ZVI, 150 um) for enhancing the methanogenesis to resist total ammonia (TAN) over 5.0 g-N.L-1 was investigated via batch experiments under mesophilic condition. The cumulative methane production was enhanced by 22.2% at >= 160 mM ZVI dosage and the HSAD duration was further shortened by 50.6% at >= 320 mM ZVI dosage. The enhanced methanogenesis was mainly resulted from the full utilization of propionate and the accelerated collapse of posterior-biodegradable organics which might be driven by ZVI. Results of microbial community and qPCR (mcrA) showed that ZVI might trigger the blooming of Methanosarcina (from 27.9% to 78.3%) and Syntrophomonas (0.5% to 3.7%) and attribute to their possible direct interspecies electron transfer (DIET) to enhance propionate utilization. Besides, the main methanogenesis might remain in the effective aceticlastic pathway even under free ammonia (FAN) almost 1.0 g-N.L-1 because syntrophic acetate oxidizing bacteria (SAOB) decreased to almost none at 320 mM ZVI dosage. Dosing ZVI could relieve HSAD from TAN inhibition and more dosage was required to resist FAN inhibition. (C) 2020 Elsevier Ltd. All rights reserved.
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