Denitrification performance and microbial communities of solid-phase denitrifying reactors using poly (butylene succinate)/bamboo powder composite

Wanhe Qi, Mohammad J. Taherzadeh, Yunjie Ruan*, Yale Deng, Ji Shuang Chen, Hui Feng Lu, Xiang Yang Xu

*Corresponding author for this work

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Abstract

This study explored the denitrification performance of solid-phase denitrification (SPD) systems packed with poly (butylene succinate)/bamboo powder composite to treat synthetic aquaculture wastewater under different salinity conditions (0‰ Vs. 25‰). The results showed composite could achieve the maximum denitrification rates of 0.22 kg (salinity, 0‰) and 0.34 kg NO3 -N m−3 d−1 (salinity, 25‰) over 200-day operation. No significant nitrite accumulation and less dissolved organic carbon (DOC) release (<15 mg/L) were found. The morphological and spectroscopic analyses demonstrated the mixture composites degradation. Microbial community analysis showed that Acidovorax, Simplicispira, Denitromonas, SM1A02, Marinicella and Formosa were the dominant genera for denitrifying bacteria, while Aspergillus was the major genus for denitrifying fungus. The co-network analysis also indicated the interactions between bacterial and fungal community played an important role in composite degradation and denitrification. The outcomes provided a potential strategy of DOC control and cost reduction for aquaculture nitrate removal by SPD.

Original languageEnglish
Article number123033
JournalBioresource Technology
Volume305
DOIs
Publication statusPublished - 1 Jun 2020

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Keywords

  • Bacterial community
  • Fungal community
  • PBS/Bamboo composite
  • RAS effluent treatment
  • Solid-phase denitrification

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