Microbial analysis for the ammonium removal from landfill leachate in an aerobic granular sludge sequencing batch reactor

In this study, a laboratory-scale sequencing batch reactor (SBR) equipped with aerobic granular sludge (AGS) technology was continuously operated for 220 days to remove ammonium from an existing landfill leachate. The ammonium removal was characterized by polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE) technology. This method helped to analyze the long-term community structural stability of ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB) and denitrifying bacteria (DB) throughout the experiment. Simultaneously, 16S rRNA gene cloning and sequencing analysis identified the dominant species of different microbial species. Experimental results confirmed that ammonium removal was inhibited at the high nitrogen loading rate (NLR) stage while the low NLR stage achieved satisfactory ammonium removal. Moreover, the findings demonstrated that functionally stable wastewater treatment bioreactors facilitated the occurrence of stable microbial community structures.

Automated summary

This study utilized aerobic granular sludge technology to remove ammonium from landfill leachate, analyzing the stability of microbial community structures using PCR-DGGE technology. It was found that high nitrogen loading rates hindered ammonium removal, while low loading rates achieved satisfactory results, indicating the importance of stable wastewater treatment bioreactors in maintaining microbial community stability.