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<p>The pig industry generates copious amounts of liquid pig manure (LPM), which poses a great challenge to the environment; conventional treatment of the manure is often time-consuming and inefficient. We developed a novel technique for converting LPM into liquid microbial fertilizer with two steps: (1) screened ammonia nitrogen-degrading strains and synthetic microbial communities (SynCom) were used in combination with H<sub>2</sub>O<sub>2</sub> for the biological deodorization of LPM; and (2) the bio-deodorized and autoclaved LPM was then inoculated with screened SynCom2 to produce liquid microbial fertilizers. The results of bio-deodorization demonstrated that both single ammonia nitrogen-degrading strains and SynCom1 reduced over 90% of the odor and GHGs emissions (NH<sub>3</sub>, H<sub>2</sub>S, CO<sub>2</sub> and CH<sub>4</sub>) from LPM, and decreased the pH, chemical oxygen demand (COD), ammoniacal nitrogen (NH<sub>4</sub><sup>+</sup>-N) and EC to varying extents. The SynCom1 was able to completely eliminate malodorous volatile organic compounds (p-methyl phenol) from LPM, outperforming single ammonia nitrogen-degrading strains. The deodorized LPM treated with SynCom2 exhibited high levels of nutrient concentration (31.58&#xa0;g/L of total carbon and 3.81&#xa0;g/L of total nitrogen), microbial biomass (up to 1.92 × 10<sup>10</sup> CFU/mL), plant safety and maturity (germination index &gt; 100%), indicating suitability as microbial fertilizer. Cultivation experiments demonstrated a significant increase of over 70% in shoot length, root length, fresh weight and dry weight of rice seedlings when microbial fertilizers were applied in black soil. Overall, our study provided a valuable direction for the development of potential industrial applications.</p>

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A novel strategy for synthetic microbial community conversion of liquid pig manure into microbial fertilizer

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月1日

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  • Bihui Wang,
  • Chunling Chang,
  • Zhigang Wang,
  • Yunlong Hu,
  • Weihui Xu,
  • Wenjing Chen,
  • Neil McLaughlin

摘要

The pig industry generates copious amounts of liquid pig manure (LPM), which poses a great challenge to the environment; conventional treatment of the manure is often time-consuming and inefficient. We developed a novel technique for converting LPM into liquid microbial fertilizer with two steps: (1) screened ammonia nitrogen-degrading strains and synthetic microbial communities (SynCom) were used in combination with H2O2 for the biological deodorization of LPM; and (2) the bio-deodorized and autoclaved LPM was then inoculated with screened SynCom2 to produce liquid microbial fertilizers. The results of bio-deodorization demonstrated that both single ammonia nitrogen-degrading strains and SynCom1 reduced over 90% of the odor and GHGs emissions (NH3, H2S, CO2 and CH4) from LPM, and decreased the pH, chemical oxygen demand (COD), ammoniacal nitrogen (NH4+-N) and EC to varying extents. The SynCom1 was able to completely eliminate malodorous volatile organic compounds (p-methyl phenol) from LPM, outperforming single ammonia nitrogen-degrading strains. The deodorized LPM treated with SynCom2 exhibited high levels of nutrient concentration (31.58 g/L of total carbon and 3.81 g/L of total nitrogen), microbial biomass (up to 1.92 × 1010 CFU/mL), plant safety and maturity (germination index > 100%), indicating suitability as microbial fertilizer. Cultivation experiments demonstrated a significant increase of over 70% in shoot length, root length, fresh weight and dry weight of rice seedlings when microbial fertilizers were applied in black soil. Overall, our study provided a valuable direction for the development of potential industrial applications.