Phycoremediation and valorization of hypersaline pickled mustard wastewater via Chaetoceros muelleri and indigenous bacteria

• Published in: Bioresource technology 2024-02, Vol.393, p.130172-130172, Article 130172
• Main Authors: Zhang, Kai, Jiang, Shuqin, Zhang, Juan, Zheng, Jishu, Li, Ping, Wang, Song, Bi, Ru, Gao, Lihong
• Format: Article
• Language: English
• Subjects: Diatom; High salinity; Microalgae-bacteria consortium; Nutrient removal; Pilot-scale verification
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2023.130172

[Display omitted] •PMW (10%) was successfully remediated by a diatom-bacteria consortium.•COD, TN and TP in PMW (10%) was reduced by 82%, 94% and 96%, respectively.•Chaetoceros muelleri could inhibit the growth of Malaciobacter in the PMW.•An outdoor experiment confirmed the remediating performance in a continuous mode. Hypersaline pickled mustard wastewater (PMW), a typical food wastewater with high nutrient content, was successfully bioremediated via the co-treatment of Chaetoceros muelleri and indigenous bacteria in this study. Chemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus in 10 % PMW could be effectively reduced by 82 %, 90 %, 94 % and 96 %, respectively, after 12 days treatment. Oxygen species activities, malondialdehyde content, microalgal biomass, photosynthesis and extracellular polymeric substances were characterized during the treatment to determine the responses of the consortium when exposed to different concentration of PMW. Microbial community analysis demonstrated a significant increase in the relative abundance of Halomonas and Marinobacter in the 10 % PMW after 12 days treatment, which was beneficial for nutrients recycling by the diatoms. Meanwhile, C. muelleri was effective in reducing the relative abundance of potentially pathogenic bacteria Malaciobacter. In conclusion, the work here offers a promising and environmentally friendly approach for hypersaline wastewater treatment.