Abstract：
Acid-pretreated pistachio shells were used as carbon sources to investigate the effects of carbon source dosage on simultaneous nitrogen and phosphorus removal under different carbon/nitrogen (C/N) ratios (7, 9, and 11). Results showed that C/N was positively correlated with mixed liquor suspended solids (MLSS) (R2 = 0.998, p < 0.01) and f value (R2 = 0.975, p < 0.05). Moreover, it was negatively correlated with the sludge volume index (SVI) (R2 = - 0.959, p < 0.05). C/N was also significantly negatively related to chemical oxygen demand removal rate (R2 = - 0.986, p < 0.05) and positively related to ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) removal rate (p < 0.05), the correlation coefficients were 0.992, 0.990 and 0.994, respectively. In the reactor with C/N of 11, the MLSS concentration and f value were the highest, the SVI was the lowest, and the removal efficiencies of NH4+-N (85.49 % ± 1.96 %), TN (84.19 % ± 1.42 %) and TP (94.10 % ± 1.67 %) were the highest. Furthermore, the relative abundance of denitrifying bacteria was the highest in the reactor. The abundance of nitrifying bacteria and phosphorus-removal bacteria was also relatively high.
摘要：
以酸预处理的开心果壳为碳源，研究了不同碳/氮（C/N）比（7、9和11）下碳源用量对同步脱氮除磷的影响。结果表明，C/N与混合液悬浮物（MLSS）（R2=0.998，p<0.01）和f值（R2=0.975，p<0.05）呈正相关。此外，与污泥体积指数(SVI)呈负相关(R2=-0.959,p<0.05)。C/N与化学需氧量去除率呈明显负相干(R2=-0.986,p<0.05),与氨氮(NH4+-N)呈正相干,总氮(TN)，和总磷(TP)去除率(p<0.05)，相关系数分别为0.992、0.990和0.994。在C/N为11的反应器中，MLSS浓度和f值最高，SVI是最低的,对NH4+-N的去除效率(85.49%±1.96%),TN(84.19%±1.42%)和TP(94.10%±1.67%)最高。此外，反应器中反硝化细菌的相对丰度最高。硝化细菌和除磷细菌的丰度也相对较高。
