Journal
ECOLOGICAL ENGINEERING
Volume 147, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2020.105762
Keywords
Ceramic filter medium; Dewatered aluminum sludge; Denitrification functional gene; Nitrogen removal; Response relation
Funding
- Innovative team project of Nanjing Institute of Environmental Sciences, MEE
- National Natural Science Foundation of China [51778265, 51709001]
- Major Science and Technology Program for Water Control and Treatment [2017ZX07204001, 2017ZX07202006]
- Key R&D Program of Ningxia Province (a special project for S & T cooperation with units outside the province in 2019) [2019BFG02028]
- Research Project for Environmental Science and Technology of Ecological Environment Department, Ningxia [2018-005]
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A ceramic filter medium (CFM) and dewatered aluminum sludge (DAS) were used as a small-scale combined biofilter to treat synthetic livestock wastewater. The average removal efficiency of ammonia nitrogen (NH4+-N) and total nitrogen (TN) reached 95.75 and 75.11% respectively. Illumina sequencing indicated that, except for initial media, most beta diversities of napA, narG, nirS, qnorB, and nosZ in the CFM or DAS were in a steady-state condition regardless of space-time variation, while these genes showed discrepancy between the CFM and DAS. In addition, the dominant genera were principally influenced by the synergic environmental factors, namely NH4+-N, TN, chemical oxygen demand (COD), and pH of effluents. This research demonstrated that the elimination of TN for treating synthetic livestock wastewater could be achieved by increasing the relative abundance of Azoarcus, Rhodanobacter, and Burkholderia. Meanwhile, increasing these genera contributes to suppressing the genera disadvantageous to TN attenuation.
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