Abstract:Diverse microbial communities coexist in the partial nitritation-anaerobic ammonium oxidation (PNA) process, in which nitrogen metabolism and information exchange are two important microbial interactions. In the PNA process, the existence of diverse microorganisms including nitrifiers, anammox bacteria, and heterotrophs makes it challenging to achieve a balanced relationship between anaerobic ammonium oxidation bacteria and ammonia oxidizing bacteria. In this study, potential microbial functions in nitrogen co… Show more
“…As reported, 91 the AHL-QS system is a critical pathway of microbial communication in partial nitritationanaerobic ammonium oxidation systems; in their study, Ndodecanoyl homoserine lactone, N-decanoyl homoserine lactone, and N-octanoyl-L-homoserine lactone were the major AHLs, which may be generated by N-transforming microorganisms and heterotrophs. 91 AHLs can alter the expression of corresponding genes in anammox bacteria, leading to microbial community succession, metabolite synthesis, and increased N removal capacity. 92 N-hexanoyl-homoserine lactone (C6-HSL), one of the most typical AHLs, enhances nitrification and denitrification performance.…”
Section: N-metabolizing Enzymesmentioning
confidence: 85%
“…Among Gram-negative bacteria (involving some denitrifiers and all nitrifiers), AHLs are the most prevalent signaling molecules. As reported, the AHL-QS system is a critical pathway of microbial communication in partial nitritation-anaerobic ammonium oxidation systems; in their study, N-dodecanoyl homoserine lactone, N-decanoyl homoserine lactone, and N-octanoyl-L-homoserine lactone were the major AHLs, which may be generated by N-transforming microorganisms and heterotrophs . AHLs can alter the expression of corresponding genes in anammox bacteria, leading to microbial community succession, metabolite synthesis, and increased N removal capacity .…”
Nitrogen is a component of many fundamental biomolecules and also participates in environmental redox chemistry. Nitrogen pollution is a serious environmental problem. Biological nitrogen removal is one of the most significant issues in wastewater treatment. Microbial-driven nitrogen transformations are carried out through metabolic pathways. Wastewater treatment systems using microalgal-bacterial cocultures can improve nutrient removal efficiency through interspecies synergistic interactions. However, relevant studies on the nitrogen metabolism and microbial characteristics of microalgal-bacterial systems have not been systematically reviewed and discussed. This Review comprehensively analyzes nitrogen contaminants in various biological nitrogen removal microalgal-bacterial composite systems and summarizes the microbial characteristics and nitrogen-metabolizing enzymes present. Nitrogen metabolism regulation methods involving quorum sensing and genetic regulation are described, and methods of enhancing microbial nitrogen removal through microbial community interactions, enhancing enzyme activity, and promoting electron transfer are introduced in detail. This Review provides a perspective on the improvement and optimization of microalgalbacterial wastewater treatment technology through analyzing the nitrogen metabolism and increasing process performance.
“…As reported, 91 the AHL-QS system is a critical pathway of microbial communication in partial nitritationanaerobic ammonium oxidation systems; in their study, Ndodecanoyl homoserine lactone, N-decanoyl homoserine lactone, and N-octanoyl-L-homoserine lactone were the major AHLs, which may be generated by N-transforming microorganisms and heterotrophs. 91 AHLs can alter the expression of corresponding genes in anammox bacteria, leading to microbial community succession, metabolite synthesis, and increased N removal capacity. 92 N-hexanoyl-homoserine lactone (C6-HSL), one of the most typical AHLs, enhances nitrification and denitrification performance.…”
Section: N-metabolizing Enzymesmentioning
confidence: 85%
“…Among Gram-negative bacteria (involving some denitrifiers and all nitrifiers), AHLs are the most prevalent signaling molecules. As reported, the AHL-QS system is a critical pathway of microbial communication in partial nitritation-anaerobic ammonium oxidation systems; in their study, N-dodecanoyl homoserine lactone, N-decanoyl homoserine lactone, and N-octanoyl-L-homoserine lactone were the major AHLs, which may be generated by N-transforming microorganisms and heterotrophs . AHLs can alter the expression of corresponding genes in anammox bacteria, leading to microbial community succession, metabolite synthesis, and increased N removal capacity .…”
Nitrogen is a component of many fundamental biomolecules and also participates in environmental redox chemistry. Nitrogen pollution is a serious environmental problem. Biological nitrogen removal is one of the most significant issues in wastewater treatment. Microbial-driven nitrogen transformations are carried out through metabolic pathways. Wastewater treatment systems using microalgal-bacterial cocultures can improve nutrient removal efficiency through interspecies synergistic interactions. However, relevant studies on the nitrogen metabolism and microbial characteristics of microalgal-bacterial systems have not been systematically reviewed and discussed. This Review comprehensively analyzes nitrogen contaminants in various biological nitrogen removal microalgal-bacterial composite systems and summarizes the microbial characteristics and nitrogen-metabolizing enzymes present. Nitrogen metabolism regulation methods involving quorum sensing and genetic regulation are described, and methods of enhancing microbial nitrogen removal through microbial community interactions, enhancing enzyme activity, and promoting electron transfer are introduced in detail. This Review provides a perspective on the improvement and optimization of microalgalbacterial wastewater treatment technology through analyzing the nitrogen metabolism and increasing process performance.
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