論文

査読有り 国際誌
2020年1月

Effects of thiosulfate addition on ammonia and nitrogen removal in biofilters packed with Oyaishi (pumice tuff).

Animal science journal = Nihon chikusan Gakkaiho
  • Tomoko Yasuda
  • ,
  • Yasuyuki Fukumoto
  • ,
  • Miyoko Waki
  • ,
  • Toshimi Matsumoto
  • ,
  • Hirohide Uenishi

91
1
開始ページ
e13313
終了ページ
記述言語
英語
掲載種別
DOI
10.1111/asj.13313

Ammonia removal is achieved partly by absorption and nitrification in biofilters, resulting in the accumulation of nitrogen and the necessity of treating the effluent water. We investigated the effects of thiosulfate addition to a biofilter containing pumice tuff for ammonia and nitrogen removal in a laboratory-scale experiment. The addition of thiosulfate to the circulating water led to a decreased nitrate and nitrite along with an increase of sulfate. The inorganic nitrogen in the circulating water decreased by up to 44% with thiosulfate addition compared to without thiosulfate. Batch experiments revealed that denitrification activity decreased exponentially along with increases in dissolved oxygen; however, approximately 30% of denitrification activity was maintained at dissolved oxygen concentration of 3.3 mg/L. Metabarcoding of 16S rRNA genes indicated that the genus Thiobacillus had a relative abundance of 0.002%-0.016% of total bacteria in the biofilter packing material. The circulating water pH was decreased below 5 with sulfur oxidation, and ammonium was accumulated without pH control resulting in a decrease in the relative abundance of the family Nitrosomonadaceae. Its relative abundance increased with control of pH to near neutral, indicating that ammonia-oxidizing activity could be maintained by adjusting pH. Thiosulfate addition could stimulate nitrogen removal by sulfur-dependent denitrification in biofiltration systems.

リンク情報
DOI
https://doi.org/10.1111/asj.13313
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/31755175
ID情報
  • DOI : 10.1111/asj.13313
  • ISSN : 1344-3941
  • PubMed ID : 31755175

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