LiuJunxi,JianLongyu,MaHaiyuan,et al.Influence of Biochar Addition Amount on Nitrogen Removal Efficiency of Pyrite Bioretention Cells[J].China Water & Wastewater,2026,42(13):122-129.
Influence of Biochar Addition Amount on Nitrogen Removal Efficiency of Pyrite Bioretention Cells
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第13期
Page:
122-129
Column:
Date of publication:
2026-07-01
- Keywords:
- pyrite bioretention cell; biochar; nitrogen removal contribution rate; microbial diversity
- Abstract:
- Due to the limited denitrifying electron donors, the bioretention cells of pyrite have low nitrogen removal performance under the condition of high nitrogen load in runoff. Biochar, with its high specific surface, electron shuttle capacity, and excellent ammonia nitrogen (NH4+-N) adsorption capacity, can be added to bioretention cells to improve nitrogen removal efficiency. However, the effect of different amounts of biochar on nitrogen removal efficiency has not been quantified.In view of the above deficiencies, this study constructed bioretention cells with different ratios of biochar and pyrite combined with simulated rainfall test and microbial high-throughput sequencing, systematically analyzed the effect of biochar addition on nitrogen removal. The results showed that the removal rates of NO3--N and TN were significantly improved by optimizing the synergistic path of heterotrophic and autotrophic denitrification in the facilities with 10% biochar addition in the submerged zone. Microbial analysis further showed that the Chao1 index of the facility with 10% biochar added increased by 122% compared with that of the pure pyrite group, and the enrichment of norank_f_Anaerolineaceae and Bacteroidota synergistically enhanced the efficiency of carbon and nitrogen metabolism and electron transfer.
Last Update:
2026-07-01