Abstract：To further improve the efficiency of multi-soil-layering (MSL) systems, the effects of biochar on the removal mechanism were investigated through the comparison of typical pollutant removal efficiencies and microbial community structure in MSLs with different shaped soil modules(square and U-shaped). The results showed that biochar could significantly improve the average removal rate of pollutants in MSLs (P<0.05) under different hydraulic loads, exhibiting fast start-up and shock load resistance. The average removal rates were 87.74%, 96.23%, 97.65% and 89.38% for CODCr, TP, NH3-N and TN. The U-shaped structure could improve the average removal rates of CODCr, TP, NH3-N, and TN, which was not significantly different from the square structure (P>0.05)(except TP). Biochar enhanced the removal of ammonia nitrogen by increasing the relative abundance of ammonia-oxidizing bacteria and denitrifying bacteria, and the denitrification became more smooth with a higher relative abundance of nitrite-oxidizing bacteria in U-shaped MSL system. Therefore, biochar enhanced the efficiencies and stability by regulating the structural characteristics of microbial communities and the waterflow in MSL systems.
郑世界, 张建强, 何杨, 杨淞淋, 蒋梅, 陶艺. 生物炭对MSL污水处理及微生物群落结构的影响[J]. 中国环境科学, 2023, 43(4): 1696-1705.
ZHENG Shi-jie, ZHANG Jian-qiang, HE Yang, YANG Song-lin, JIANG Mei, TAO Yi. Effects of biochar on sewage disposal and microbial community structure in multi-soil-layering system. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1696-1705.
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