Glycine adversely affects enhanced biological phosphorus removal
Yucheng Tian1, Hang Chen1, Liping Chen1
1School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Water Research
|December 10, 2021
Summary
Glycine negatively impacts enhanced biological phosphorus removal (EBPR) in wastewater treatment, inducing phosphorus release without cellular uptake. This suggests potential for phosphorus recovery, despite glycine not being an effective carbon source for key organisms.
Area of Science:
- Environmental Microbiology
- Wastewater Treatment Engineering
- Biogeochemistry
Background:
- Enhanced biological phosphorus removal (EBPR) is crucial for phosphorus management in wastewater treatment.
- Polyphosphate accumulating organisms (PAOs) are key players in EBPR, utilizing carbon sources for phosphorus uptake.
- The role of glycine as a carbon source for PAOs and its impact on EBPR efficiency remained largely unexplored.
Purpose of the Study:
- To investigate the effect of glycine on EBPR processes using diverse microbial communities.
- To determine if glycine serves as a viable carbon source for PAOs and glycogen accumulating organisms (GAOs).
- To elucidate the mechanisms behind glycine's influence on phosphorus dynamics in wastewater treatment systems.
Main Methods:
- Testing glycine's impact on EBPR using activated sludge from full-scale and lab-scale wastewater treatment systems.
- Analyzing phosphorus release and uptake under anaerobic and aerobic conditions with varying glycine concentrations.
- Employing metatranscriptomic analysis to assess gene expression related to glycine metabolism and transport.
Main Results:
- Glycine exhibited an overall adverse effect on EBPR, inducing significant phosphorus release under anaerobic conditions without effective cellular uptake.
- PAOs continued to release phosphorus aerobically in glycine's presence, and glycine reduced the rate of aerobic phosphorus uptake.
- Metatranscriptomic data indicated incomplete glycine metabolism pathways and suggested an efflux mechanism potentially linked to ATP-consuming transport, causing phosphorus release.
Conclusions:
- Glycine is not an effective carbon source for the majority of PAOs and GAOs involved in EBPR.
- Glycine can induce phosphorus release without cellular uptake, presenting a novel mechanism for phosphorus recovery from wastewater.
- Understanding glycine's interaction with microbial communities is vital for optimizing EBPR and developing innovative phosphorus recovery strategies.
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