期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 36, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2020.101254
关键词
Heterotrophic nitrification and aerobic denitrification; Aerobic granular sludge; Micronutrients; Cheese whey; Next-generation sequencing technology
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Universidad Nacional de La Plata
- Agencia Nacional de Promocion Cientifica y Tecnologica, ARGENTINA
Dairy effluents contain limited nitrogen for biological treatment. In the present study a cheese whey wastewater was supplemented with ammonia to obtain suitable COD:N ratios. The effects of the organic load and micronutrients on the biological nitrogen removal process were analyzed in aerobic granular sequential batch reactors (SBRs). Better nitrifying activity (5.04 mg N.(L.h)(-1)) was achieved at COD:N = 100:12, when micronutrients were added. In this condition, simultaneous nitrification-denitrification led to a higher inorganic nitrogen removal. Aerobic denitrification was driven by intracellular glycogen. In absence of micronutrients, nitrification took place when the organic load was decreased (COD:N = 100:22). The microbial community was analyzed by next-generation sequencing technology. Nitrification was attributed to heterotrophic nitrifiers. Bacteria belonging to Niabella and Diaphorobacter genera and to Planctomycetales order are the main candidates responsible for the nitrification process. Co-treatment of dairy and ammonium-rich wastewater constitutes a promise strategy for the biological treatment of dairy wastewaters.
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