WANGYa-tong,ZHAOYuan,AIHeng-yu,et al.Nitrogen Removal Efficiency of Two Bio-photosensitive Material Coupled Systems under Low External Carbon Sources[J].China Water & Wastewater,2024,40(21):9-14.
两种生物-光敏材料耦合体系的低碳源脱氮效能
- Title:
- Nitrogen Removal Efficiency of Two Bio-photosensitive Material Coupled Systems under Low External Carbon Sources
- 摘要:
- 为减少污水处理过程中的碳排放量，探索低碳污水处理新途径，分离出一种新的电化学活性反硝化菌XJ2-7，将其分别与光敏材料硫化镉（CdS）和蒽醌-2-磺酸钠（AQS）偶联，用于无外碳源或低外碳源脱氮。序批试验结果表明，当初始NO3--N浓度为69.00 mg/L时，在光照无外碳源条件下，XJ2-7/CdS体系和XJ2-7/AQS体系的24 h总氮去除率分别为40.40%和52.03%，碳源量增至碳氮比为3.75时，两者的总氮去除率分别为64.40%和52.23%；在低碳源条件下，相比无光照，紫外光照射可使两种体系的总氮去除率分别提高13.72%和11.62%；在低碳源和紫外光照射条件下，乳酸钠可使两种体系的反硝化脱氮率分别提高14.48%和8.91%。推测无碳源条件下，菌株XJ2-7利用光生电子进行胞外呼吸的电子转移途径依赖于细胞色素C捕获电子并传递给电子受体，或是通过具有电容功能的H-AQS向菌体释放电子。
- Abstract:
- In order to reduce carbon emissions in the process of sewage treatment and explore a new way of low-carbon sewage treatment, a new electrochemically active denitrifying bacterium XJ2-7 was isolated and coupled with the photosensitive materials cadmium sulfide (CdS) and sodium anthraquinone-2-sulfonate (AQS) for denitrification with or without low external carbon sources. The results of sequential batch experiments showed that under the condition that there was no external carbon source in the light when the initial NO3--N concentration was 69.00 mg/L, the 24 hours total nitrogen removal rates of XJ2-7/CdS and XJ2-7/AQS were 40.40% and 52.03%, respectively. When the carbon source increased to a C/N ratio of 3.75, the total nitrogen removal rates of the two were 64.40% and 52.23%, respectively. Under the condition of low carbon source, ultraviolet light irradiation could increase the total nitrogen removal rate of the two systems by 13.72% and 11.62%, respectively. Under the conditions of low carbon source and ultraviolet irradiation, sodium lactate could increase the denitrification rates of the two systems by 14.48% and 8.91%, respectively. It is speculated that the electron transfer pathway of strain XJ2-7 using photogenerated electrons for extracellular respiration under the condition of no carbon source depends on cytochrome C to capture electrons and transfer them to electron acceptors, or to release electrons to the cell through capacitive H?AQS.
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