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<p>Employing fermented broth as a carbon source for denitrification in wastewater treatment is a promising approach for the effective utilization of food waste. However, the organic nitrogen content is relatively high, which would increase the effluent concentration of total nitrogen (TN). This study investigated the effects of pH, temperature, and sludge inoculum dosage on the acidification and ammonification of broth from food waste. Adjusting the pH by using Ca(OH)<sub>2</sub> instead of NaOH could enhance the concentrations of volatile fatty acids (VFAs), and improve the ammonification efficiency. Continuous experiments were carried out under optimal conditions determined by orthogonal experiments. Results showed that it took about 10 days to reach stable acidification and ammonification conditions. Optimal performance was achieved at a pH of 6.5–7.0 and a temperature of 42.5&#xa0;°C, where the concentrations of VFAs stabilized at 35.0&#xa0;g/L, and the ratio of ammonium nitrogen (NH<sub>4</sub><sup>+</sup>-N) to TN (NH<sub>4</sub><sup>+</sup>-N/TN) remained around 75%. When the pH of the broth from food waste was adjusted to 6.5, the cost of NaOH was about 35.6–38.3 ¥/t broth and the cost of Ca(OH)<sub>2</sub> was about 16.8–28.0 ¥/t broth. This study offers an optimal case for the utilization of broth from food waste in applied scenarios.</p>

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How to facilitate the ammonization of dissolved organic nitrogen during the fermentation of food waste?

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Zhenzhen Zhao,
  • Ye Zhou,
  • Guihong Jiang,
  • Huimin Huang,
  • Yangmin Yi,
  • Hongliang Zhang,
  • Pinjing He

摘要

Employing fermented broth as a carbon source for denitrification in wastewater treatment is a promising approach for the effective utilization of food waste. However, the organic nitrogen content is relatively high, which would increase the effluent concentration of total nitrogen (TN). This study investigated the effects of pH, temperature, and sludge inoculum dosage on the acidification and ammonification of broth from food waste. Adjusting the pH by using Ca(OH)2 instead of NaOH could enhance the concentrations of volatile fatty acids (VFAs), and improve the ammonification efficiency. Continuous experiments were carried out under optimal conditions determined by orthogonal experiments. Results showed that it took about 10 days to reach stable acidification and ammonification conditions. Optimal performance was achieved at a pH of 6.5–7.0 and a temperature of 42.5 °C, where the concentrations of VFAs stabilized at 35.0 g/L, and the ratio of ammonium nitrogen (NH4+-N) to TN (NH4+-N/TN) remained around 75%. When the pH of the broth from food waste was adjusted to 6.5, the cost of NaOH was about 35.6–38.3 ¥/t broth and the cost of Ca(OH)2 was about 16.8–28.0 ¥/t broth. This study offers an optimal case for the utilization of broth from food waste in applied scenarios.