Effects of thiosulfate addition on ammonia and nitrogen removal in biofilters packed with Oyaishi (pumice tuff)
| Autor: | Miyoko Waki, Toshimi Matsumoto, Yasuyuki Fukumoto, Tomoko Yasuda, Hirohide Uenishi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Denitrification
Nitrogen Thiosulfates chemistry.chemical_element Wastewater 03 medical and health sciences chemistry.chemical_compound Ammonia Nitrate Nitrosomonadaceae RNA Ribosomal 16S Ammonium Nitrites 030304 developmental biology Thiosulfate 0303 health sciences Nitrates Silicates 0402 animal and dairy science 04 agricultural and veterinary sciences General Medicine Hydrogen-Ion Concentration Thiobacillus 040201 dairy & animal science Air Filters chemistry Environmental chemistry Biofilter Nitrification General Agricultural and Biological Sciences |
| Zdroj: | Animal Science Journal. 91 |
| ISSN: | 1740-0929 1344-3941 |
| DOI: | 10.1111/asj.13313 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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