School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2012 Sep;119:55-9. doi: 10.1016/j.biortech.2012.05.133. Epub 2012 Jun 1.
Photosynthetic bacteria (PSB) wastewater treatment has the advantage of biomass recovery in together with pollutant removal. The effects of different Fe(2+) concentrations on the biomass accumulation through regulating energy metabolism were investigated in PSB wastewater treatment. Results showed that the optimal Fe(2+) dosage was 20mg/L. Optimal Fe(2+) content could significantly increase the biomass production (4800.9 mg/L) and COD removal (93.4%). Addition of 10-30 mg/L Fe(2+) could shorten the hydraulic retention time of wastewater. Mechanism analyses revealed that different Fe(2+) concentrations had different impacting mechanisms on biomass accumulation. Fe(2+) constituted the dehydrogenase active center, and therefore proper addition of Fe(2+) could improve energy production by up-regulating dehydrogenase activity, which was beneficial for biomass accumulation. With 20mg/L Fe(2+), the dehydrogenase activity and ATP production of PSB were improved by 48.1% and 42.4%, respectively. However, excessive addition of Fe(2+) was harmful for biomass accumulation since the ions inhibited the dehydrogenase activity.
光合细菌（PSB）废水处理具有在去除污染物的同时回收生物量的优点。本研究考察了不同 Fe(2+)浓度通过调节能量代谢对 PSB 废水处理中生物量积累的影响。结果表明，最佳 Fe(2+)投加量为 20mg/L。最佳 Fe(2+)含量可显著提高生物量（4800.9mg/L）和 COD 去除率（93.4%）。添加 10-30mg/L 的 Fe(2+)可缩短废水的水力停留时间。机理分析表明，不同浓度的 Fe(2+)对生物量积累有不同的影响机制。Fe(2+)构成脱氢酶活性中心，因此适量添加 Fe(2+)可以通过上调脱氢酶活性来提高能量生成，这有利于生物量的积累。在 20mg/L 的 Fe(2+)下，PSB 的脱氢酶活性和 ATP 生成分别提高了 48.1%和 42.4%。然而，过量添加 Fe(2+)不利于生物量的积累，因为这些离子会抑制脱氢酶的活性。
