Temperature Effects on Zn(II) Toxicity to Metabolisms of Polyphosphate Accumulating Organisms in Aerobic and Anaerobic Conditions
Tsai YP*, Lu MS, Lin JW, Chou CC and Hu LY
Department of Civil Engineering, National Chi-Nan University, Taiwan, Republic of China
- *Corresponding Author:
- Yung-Pin Tsai
Department of Civil Engineering
National Chi-Nan University
Puli 545, Taiwan, Republic of China
E-mail: [email protected]
Received date: August 26, 2016; Accepted date: October 03, 2016; Published date: October 20, 2016
Citation: Tsai YP, Lu MS, Lin JW, Chou CC, Hu LY (2016) Temperature Effects on Zn(II) Toxicity to Metabolisms of Polyphosphate Accumulating Organisms in Aerobic and Anaerobic Conditions. J Environ Anal Chem 4:187. doi:10.41722380-2391.1000187
Copyright: © 2016 Tsai YP, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
This study explores the influence of temperature on the tolerance of polyphosphate accumulating organisms (PAOs) to Zn(II) in enhanced biological phosphorus removal. The results show anaerobic and aerobic metabolisms of PAOs decreased with increasing Zn(II) concentration varying between 0-2 mg L-1 and temperature indeed affected inhibitive degrees. Furthermore, Zn(II) is more toxic to anaerobic poly-P hydrolysis and glycogen degradation at 10°C than at 20 and 30°C. For anaerobic polyhydroxyalkanoate (PHA) synthesis, Zn(II) had a highly inhibitive effect at 10°C too. The inhibitions of PAOs aerobically taking up phosphorus, degrading PHA and replenishing glycogen in the presence of Zn(II) were amplified at 10°C. The metabolism of aerobic PHA degradation at 10°C was completely terminated and the aerobic replenishment of glycogen at 10° C was also completely terminated at 0.1 mg L-1 of Zn(II) due to the complete inhibition of aerobic PHA metabolism, which provides the required reducing power for synthesizing glycogen.