A novel method to supply the inhibitory aromatic compounds in aerobic biodegradation process

1992 ◽  
Vol 6 (6) ◽  
pp. 489-494 ◽  
Author(s):  
Yong-Bok Choi ◽  
Jang-Young Lee ◽  
Hye-Kyung Lim ◽  
Hak-Sung Kim
Keyword(s):  
Aromatic Compounds ◽  
Aerobic Biodegradation ◽  
Biodegradation Process ◽  
Novel Method

scholarly journals A Modified Method to Calculate Dual Isotope Slopes for the Natural Attenuation of Organic Pollutants in the Environment

2021 ◽  
Author(s):  
Jin-Ru Feng ◽  
Hong-Gang Ni
Keyword(s):  
Reaction Mechanism ◽  
Isotope Fractionation ◽  
Isotope Analysis ◽  
Aerobic Biodegradation ◽  
Two Dimensional ◽  
Data Set ◽  
Dual Isotope ◽  
Sulfate Reducing ◽  
Modified Method ◽  
Novel Method

Abstract Two-dimensional compound specific isotope analysis has become a powerful tool to distinguish reaction mechanism. Lambda (Λ), an essential and important parameter for processing two-dimensional isotope fractionation data, is specific to a reaction mechanism. In the present article, we modified the existing algorithms for Lambdas based on the review of the current methods. Specifically, through regressing [(1000+δE0,2)*(n1*x2)*ΔδEbulk,1] versus [(1000+δE0,1)*(n2*x1)*ΔδEbulk,2] by York method, a novel method was developed to calculate Λs. The improved method eliminates both the influence of non-reacting position and the initial isotope signatures. Furthermore, this method retains the advantages of two-dimension isotope plot, which eliminates contributions from commitment to catalysis, no need to determine fraction of remaining substrate and can be constructed even from filed data. At the same time, one sample t test is applied to generate 95% confidence interval of data set of Λris for various reaction mechanisms. The range of 5.67-24.8, 8.54-9.80, 0.51-8.35, 25.2-36.8, 7.09-21.9 are responsible for oxidation of C-H bonds (ZC=1, ZH=3), oxidation of C-H bonds (ZC=1,ZH=4), aerobic biodegradation of benzene (ZC=6,ZH=6), methanogenic or sulfate-reducing biodegradation of benzene (ZC=6,ZH=6), and nitrate-reducing biodegradation of benzene (ZC=6,ZH=6). The accumulation and correction of these values will make the data measured in the field easier to interpret.

Biodegradation of 17α-Ethinylestradiol in Sediment/Water Systems Affected by Two Different Rhamnolipidic Homologues

2014 ◽  
Vol 955-959 ◽  
pp. 7-15
Author(s):  
Yan Ping Guo ◽  
Hui Lin
Keyword(s):  
Shake Flask ◽  
Water System ◽  
Inhibitory Effect ◽  
Water Systems ◽  
Aerobic Biodegradation ◽  
Intermediate Metabolites ◽  
Biodegradation Process ◽  
Enhanced Biodegradation ◽  
Uptake And Metabolism

The shake flask aerobic biodegradation experiment was used to study the effect on biodegradation of 17α-ethinylestradiol (EE2) in the sediment/water system affected by mono-rhamnolipid (RL-F1) and di-rhamnolipid (RL-F2). The results showed that RL-F1 and RL-F2 had no inhibitory effect on EE2 biodegradation. The effect of RL-F1 on enhanced biodegradation of EE2 was larger than that of RL-F2. In 6 mM and 10 mM of the rhamnolipidic functioned systems, EE2 biotransformation rates affected by RL-F1 were respectively 7.6 and 8.2 times of those of RL-F2 corresponding systems. The accumulation and change rule of the intermediate metabolites M.1 with the polarity greater than EE2 and M.3 with the polarity weaker then EE2 in the biodegradation process were analyzed. In the RL-F2 systems, the time for the accumulative amounts of M.1 and M.3 up to the peak was correspondingly lagged and their output was relatively lower. The testing result of rhamnolipids in the sample showed that RL-F1 was more biodegradable than RL-F2. The bioavailability of di-rhamnolipidic micelle solubilized with EE2 was inferior to that of mono-rhamnolipid, making the organic uptake and metabolism process of microorganisms slow down.

scholarly journals Reactions Involved in the Lower Pathway for Degradation of 4-Nitrotoluene by Mycobacterium Strain HL 4-NT-1

2000 ◽  
Vol 66 (7) ◽  
pp. 3010-3015 ◽  
Author(s):  
Zhongqi He ◽  
Jim C. Spain
Keyword(s):  
Aromatic Compounds ◽  
Nitroaromatic Compounds ◽  
Aerobic Biodegradation ◽  
Ring Cleavage ◽  
Pseudomonas Pseudoalcaligenes ◽  
Substrate Specificities ◽  
Number Of Microorganisms

ABSTRACT In spite of the variety of initial reactions, the aerobic biodegradation of aromatic compounds generally yields dihydroxy intermediates for ring cleavage. Recent investigation of the degradation of nitroaromatic compounds revealed that some nitroaromatic compounds are initially converted to 2-aminophenol rather than dihydroxy intermediates by a number of microorganisms. The complete pathway for the metabolism of 2-aminophenol during the degradation of nitrobenzene by Pseudomonas pseudoalcaligenes JS45 has been elucidated previously. The pathway is parallel to the catechol extradiol ring cleavage pathway, except that 2-aminophenol is the ring cleavage substrate. Here we report the elucidation of the pathway of 2-amino-4-methylphenol (6-amino-m-cresol) metabolism during the degradation of 4-nitrotoluene by Mycobacterium strain HL 4-NT-1 and the comparison of the substrate specificities of the relevant enzymes in strains JS45 and HL 4-NT-1. The results indicate that the 2-aminophenol ring cleavage pathway in strain JS45 is not unique but is representative of the pathways of metabolism of othero-aminophenolic compounds.

Assessment on activated sludge models for acetate biodegradation under aerobic conditions

2009 ◽  
Vol 60 (4) ◽  
pp. 983-994 ◽  
Author(s):  
M. A. Hoque ◽  
V. Aravinthan ◽  
N. M. Pradhan
Keyword(s):  
Parameter Estimation ◽  
Activated Sludge ◽  
Model Calibration ◽  
Aerobic Biodegradation ◽  
Batch Experiments ◽  
Storage Model ◽  
Biodegradation Process ◽  
Ammonia Degradation ◽  
And Storage ◽  
Activated Sludge Models

A comparison of four different established models along with parameter estimation was carried out in order to explain the aerobic biodegradation of acetate in an activated sludge system. These models were investigated using experimental OUR data from batch experiments of three different concentration studies. Model calibration reveals that ASM1 model is not suitable to explain the observed experimental OUR during the famine phase implying storage compounds could play an important role during that stage. Besides, the model corresponds to the accumulation concept and is not well fitted for all concentrations studies though it includes the storage phenomena. Both the ASM3 model and the model for simultaneous storage and growth on substrate can well describe the acetate biodegradation process, however the OUR data alone is not sufficient to justify the suitability of those models. Simulated profiles using the model outputs demonstrate that storage is overestimated while ammonia degradation is underestimated in ASM3 compared to simultaneous growth and storage model. The current study also gives reasonable outcomes related to parameter estimation as compared with previous study which is statistically interpreted in this paper.

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