Formation of Distinct Soluble Microbial Products by Activated Sludge: Kinetic Analysis and Quantitative Determination

2012 ◽  
Vol 46 (3) ◽  
pp. 1667-1674 ◽  
Author(s):  
Bing-Jie Ni ◽  
Fang Fang ◽  
Wen-Ming Xie ◽  
Juan Xu ◽  
Han-Qing Yu
Keyword(s):  
Activated Sludge ◽  
Quantitative Determination ◽  
Kinetic Analysis ◽  
Soluble Microbial Products ◽  
Microbial Products

Nitrification as a source of soluble organic substrate in biological treatment

1994 ◽  
Vol 30 (6) ◽  
pp. 1-8 ◽  
Author(s):  
Bruce E. Rittmann ◽  
John M. Regan ◽  
David A. Stahl
Keyword(s):  
Kinetic Analysis ◽  
Organic Compounds ◽  
Biological Treatment ◽  
Heterotrophic Bacteria ◽  
Theoretical Work ◽  
Organic Substrate ◽  
Nitrifying Bacteria ◽  
Organic Substrates ◽  
Soluble Microbial Products ◽  
Microbial Products

In complex, multispecies populations, exchange of substrates can be an important beneficial interaction. Prior experimental and theoretical work has led to the hypothesis that the formation of soluble microbial products (SMP) by nitrifying bacteria can provide a supplementary organic substrate for heterotrophic bacteria, thereby augmenting their accumulation and stability, especially when inputs of organic substrates are low. In this study, chemostat experiments carried out with a NO2−-oxidizing strain (Nitrobacter sp.) and an NH4+-oxidizing strain (Nitrosomonas europaea) demonstrated that both nitrifiers produce SMP that can support heterotrophic bacteria. The first evidence was the presence of significant concentrations of soluble COD in the chemostat effluent, even though the influent was free of organic compounds. Second, a small heterotrophic population was maintained, apparently through utilization of the nitrifier-produced SMP. A preliminary kinetic analysis suggested that SMP kinetic parameters can be adapted from parameters measured for heterotrophs.

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