This work investigated the effects of eight metal ions on Rhodopseudomonas palustris growth and 5-aminolevulinic acid (ALA) yield in wastewater treatment. Results show that metal ions (Mg2+ of 15 mmol/L, Fe2+ of 400 μmol/L, Co2+ of 4 μmol/L, Ni2+ of 8 μmol/L and Zn2+ of 4 μmol/L) could effectively improve the chemical oxygen demand (COD) removal, Rp. palustris biomass and ALA yield. The highest ALA yield of 13.1 mg/g-biomass was achieved with Fe2+ of 400 μmol/L. ALA yields were differentially increased under different metal ions in the following order: Fe2+ group > Mg2+ group > Co2+ group = Ni2+ group > Zn2+ group = Mo2+ group > control. Cu2+ and Mn2+ inhibited Rp. palustris growth and ALA production. Mechanism analysis revealed that metal ions changed ALA yields by influencing the activities of ALA synthetase and ALA dehydratase.
Effects of metal ions on biomass and 5-aminolevulinic acid production in Rhodopseudomonas palustris wastewater treatment
Shuli Liu, Guangming Zhang, Jianzheng Li, Xiangkun Li, Jie Zhang; Effects of metal ions on biomass and 5-aminolevulinic acid production in Rhodopseudomonas palustris wastewater treatment. Water Sci Technol 28 January 2016; 73 (2): 382–388. doi: https://doi.org/10.2166/wst.2015.479
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