School of Environment and Natural Resource, Renmin University of China, 59 Zhongguanchun Street, Beijing 100872, China.
School of Environment and Natural Resource, Renmin University of China, 59 Zhongguanchun Street, Beijing 100872, China.
Bioresour Technol. 2017 Oct;241:993-997. doi: 10.1016/j.biortech.2017.05.183. Epub 2017 Jun 1.
Dissolved oxygen (DO) is an important parameter in photosynthetic bacteria (PSB) wastewater treatment. This study set different DO levels and detected the pollutants removal, PSB growth and pigments production. Results showed that DO significantly influenced the performances of PSB wastewater treatment process. The highest COD (93%) and NH-N removal (83%) was achieved under DO of 4-8mg/L, but DO of 2-4mg/L was recommended considering the aeration cost. PSB biomass reached 1645mg/L under DO of 4-8mg/L with satisfying co-enzyme Q10 content. The biomass yield was relatively stable at all DO levels. For bacteriochlorophyll and carotenoids, DO>1mg/L could satisfy their production. On the other hand, DO<0.5mg/L led to the highest dehydrogenase activity. According to the different purposes, the optimal treatment time was different. The most pigments production occurred at 24h; biomass reached peak at 48h; and the optimal time for pollutants removal was 72h.
溶解氧（DO）是光合细菌（PSB）废水处理中的一个重要参数。本研究设置了不同的 DO 水平，并检测了污染物去除、PSB 生长和色素生产情况。结果表明，DO 对 PSB 废水处理过程的性能有显著影响。在 DO 为 4-8mg/L 时，COD（93%）和 NH-N 去除率（83%）最高，但考虑到曝气成本，建议 DO 为 2-4mg/L。在 DO 为 4-8mg/L 时，PSB 生物量达到 1645mg/L，辅酶 Q10 含量令人满意。在所有 DO 水平下，生物量产量都相对稳定。对于细菌叶绿素和类胡萝卜素，DO>1mg/L 可以满足它们的生产需求。另一方面，DO<0.5mg/L 会导致脱氢酶活性最高。根据不同的目的，最佳处理时间也不同。在 24 小时时色素产量最高；在 48 小时时生物量达到峰值；而去除污染物的最佳时间是 72 小时。
