The College of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
The College of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
Bioresour Technol. 2023 Oct;386:129507. doi: 10.1016/j.biortech.2023.129507. Epub 2023 Jul 17.
Heterotrophic nitrification-aerobic denitrification (HN-AD) process was achieved in a moving bed biofilm reactor after 180-days acclimation using PCL as carbon source for low C/N wastewater treatment. A novel HN-AD strain, JQ-H3, with ability of PCL degradation was augmented to improve nitrogen removal. TN removal efficiencies of 82.31%, 90.05%, and 93.16% were achieved in the augmented reactor (R2), at different HRTs of 24 h, 20 h, and 16 h, while in the control reactor (R1), the TN removal efficiencies were 59.24%, 74.61%, and 76.68%. The effluent COD in R2 was 10.17 mg/L, much lower than that of 42.45 mg/L in R1. Microbial community analysis revealed that JQ-H3 has successfully proliferated with a relative abundance of 4.79%. Relative abundances of functional enzymes of nitrogen cycling remarkably increased due to bioaugmentation based on the analysis of PICRUSt2. This study provides a new approach for enhancing nitrogen removal in low C/N sewage treatment via the HN-AD process.
采用 PCL 作为碳源，经过 180 天驯化，在移动床生物膜反应器中实现了异养硝化-好氧反硝化（HN-AD）过程，用于处理低 C/N 废水。一种具有 PCL 降解能力的新型 HN-AD 菌株 JQ-H3 被增强，以提高氮去除率。在不同 HRT（24 h、20 h 和 16 h）下，增强型反应器（R2）的 TN 去除效率分别达到 82.31%、90.05%和 93.16%，而在对照反应器（R1）中，TN 去除效率分别为 59.24%、74.61%和 76.68%。R2 的出水 COD 为 10.17mg/L，明显低于 R1 的 42.45mg/L。微生物群落分析表明，JQ-H3 已成功增殖，相对丰度为 4.79%。基于 PICRUSt2 的分析，氮循环功能酶的相对丰度因生物增强而显著增加。本研究为通过 HN-AD 工艺在低 C/N 污水处理中提高氮去除提供了一种新方法。
