期刊
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
卷 14, 期 6, 页码 -出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-020-1272-7
关键词
Landfill leachate; Process upgrade; Partial nitrification-denitrification; Bacterial community; Metagenomics
资金
- National Key R&D Program of China [2017YFE0114300]
- Special Fund for Science and Technology Innovation Strategy of Guangdong Province [2018B020202]
- Natural Science Foundation of Guangdong Province [2018A030310246]
- National Natural Science Foundation of China [21607177, 51622813, 51808564]
Because of the low access to biodegradable organic substances used for denitrification, the partial nitrification-denitrification process has been considered as a low-cost, sustainable alternative for landfill leachate treatment. In this study, the process upgrade from conventional to partial nitrification-denitrification was comprehensively investigated in a full-scale landfill leachate treatment plant (LLTP). The partial nitrification-denitrification system was successfully achieved through the optimizing dissolved oxygen and the external carbon source, with effluent nitrogen concentrations lower than 150 mg/L. Moreover, the upgrading process facilitated the enrichment of Nitrosomonas (abundance increased from 0.4% to 3.3%), which was also evidenced by increased abundance of amoA/B/C genes carried by Nitrosomonas. Although Nitrospira (accounting for 0.1%-0.6%) was found to stably exist in the reactor tank, considerable nitrite accumulation occurred in the reactor (reaching 98.8 mg/L), indicating high-efficiency of the partial nitrification process. Moreover, the abundance of Thauera, the dominant denitrifying bacteria responsible for nitrite reduction, gradually increased from 0.60% to 5.52% during the upgrade process. This process caused great changes in the microbial community, inducing continuous succession of heterotrophic bacteria accompanied by enhanced metabolic potentials toward organic substances. The results obtained in this study advanced our understanding of the operation of a partial nitrification-denitrification system and provided a technical case for the upgrade of currently existing full-scale LLTPs. (c) Higher Education Press 2020
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