Effect of Reclaimed Water Recycling Rates on Eco-Efficiency of Typical Wastewater Treatment Process
Wastewater recycling is an important way to reduce water pollution,improve water environment and increase water resource utilization.However,this process often leads to increased consumption of pharmaceuticals,energy and emission of greenhouse gas.Research on the ecological impacts of reclaimed water reuse on typical wastewater treatment procedures can optimize wastewater treatment strategies.In this research,the life cycle assessment method was used to evaluate the abiotic depletion potential of elements(ADPE),depletion potential of fossil resources(ADPF),ozone depletion potential(ODP),global warming potential(GWP),acidification potential(AP),eutrophication potential(EP),freshwater ecotoxicity potential(FAETP),terrestrial ecotoxicity(TETP)and human ecotoxicity potential(HTP).The ecological effects of conventional wastewater treatment process anaerobic-anoxic-oxic(AAO)and reclaimed water treatment process AAO+MBR were compared and analyzed.The results revealed that AAO+MBR process reduced EP by 1.1 times more than AAO process,and it treated wastewater more effectively than AAO process alone.In comparison to AAO process,AAO+membrane bioreactor(MBR)process had a greater impact on ADPE,ADPF,ODP,GWP,AP,FAETP,TETP,HTP.Additionally,the effects of the AAO process and the AAO+MBR process on nine environmental effects were contrasted under scenarios with various effluent reuse rates of 20%,40%,60%,80%,and 100%.The findings demonstrated that ADPE,ADPF,FAETP,and ODP were significantly impacted by reuse of reclaimed water.While when the water reuse rate was 100%,the environmental impact was reduced by 45%to 100%,respectively.When the water reuse rate was 100%,the environmental impact was reduced by 17%to 25%and the impact on eutrophication was negligible.With the change in water reuse rate,EP essentially stayed the same.This study can provide support for the optimization of wastewater treatment decision-making.
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