Biodegradation kinetics of BTE-OX and MTBE by a diesel-grown biomass

2006 ◽  
Vol 53 (11) ◽  
pp. 197-204 ◽  
Author(s):  
K. Acuna-Askar ◽  
M.A. de la Torre-Torres ◽  
M.J. Guerrero-Munoz ◽  
M.T. Garza-Gonzalez ◽  
B. Chavez-Gomez ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Removal Rate ◽  
Biodegradation Kinetics ◽  
Aqueous Samples ◽  
Removal Rates ◽  
Two Phase ◽  
Bacterial Populations ◽  
Substrate Removal ◽  
Benzene Toluene ◽  
Kinetics Of

The biodegradation kinetics of BTE-oX and MTBE, mixed all together in the presence of diesel-grown bioaugmented bacterial populations as high as 885 mg/L VSS, was evaluated. The effect of soil in aqueous samples and the effect of Tergitol NP-10 on substrate biodegradation rates were also evaluated. Biodegradation kinetics was evaluated for 54 h, every 6 h. All BTE-oX chemicals followed a first-order two-phase biodegradation kinetic model, whereas MTBE followed a zero-order removal kinetic model in all samples. BTE-oX removal rates were much higher than those of MTBE in all samples. The presence of soil in aqueous samples retarded BTE-oX and MTBE removal rates. The addition of Tergitol NP-10 to aqueous samples containing soil had a positive effect on substrate removal rate in all samples. Substrate percent removals ranged between 64.8–98.9% for benzene, toluene and ethylbenzene. O-xylene and MTBE percent removals ranged between 18.7–40.8% and 7.2–10.3%, respectively.

Effect of soil and a nonionic surfactant on BTE-oX and MTBE biodegradation kinetics

2005 ◽  
Vol 52 (8) ◽  
pp. 107-115 ◽  
Author(s):  
K. Acuna-Askar ◽  
M.V. Gracia-Lozano ◽  
J.F. Villarreal-Chiu ◽  
J.G. Marmolejo ◽  
M.T. Garza-Gonzalez ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Removal Rate ◽  
Biodegradation Kinetics ◽  
Aqueous Samples ◽  
Removal Rates ◽  
Two Phase ◽  
First Order ◽  
Substrate Removal ◽  
Benzene Toluene ◽  
Kinetics Of

The biodegradation kinetics of BTE-oX and MTBE, mixed all together, in the presence of 905mg/L VSS of BTEX-acclimated biomass was evaluated. Effects of soil and Tergitol NP-10 in aqueous samples on substrate biodegradation rates were also evaluated. Biodegradation kinetics was evaluated for 36 hours, every 6 hours. MTBE biodegradation followed a first-order one-phase kinetic model in all samples, whereas benzene, toluene and ethylbenzene biodegradation followed a first-order two-phase kinetic model in all samples. O-xylene biodegradation followed a first-order two-phase kinetic model in the presence of biomass only. Interestingly, o-xylene biodegradation was able to switch to a first-order one-phase kinetic model when either soil or soil and Tergitol NP-10 were added. The presence of soil in aqueous samples retarded benzene, toluene and ethylbenzene removal rates. O-xylene and MTBE removal rates were enhanced by soil. The addition of Tergitol NP-10 to aqueous samples containing soil had a positive effect on substrate removal rate in all samples. Substrate percent removals ranged 77–99.8% for benzene, toluene and ethylbenzene. O-xylene and MTBE percent removals ranged 50.1–65.3% and 9.9–43.0%, respectively.

BTE-OX biodegradation kinetics with MTBE through bioaugmentation

2004 ◽  
Vol 50 (5) ◽  
pp. 85-92 ◽  
Author(s):  
K. Acuna-Askar ◽  
J.F. Villarreal-Chiu ◽  
M.V. Gracia-Lozano ◽  
M.T. Garza-Gonzalez ◽  
B. Chavez-Gomez ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Removal Rate ◽  
Biodegradation Kinetics ◽  
Aqueous Samples ◽  
Two Phase ◽  
Bacterial Populations ◽  
First Order ◽  
Substrate Removal ◽  
Negative Effect ◽  
Benzene Toluene

The biodegradation kinetics of BTE-oX and MTBE, mixed all together, in the presence of bioaugmented bacterial populations as high as 880 mg/L VSS was evaluated. The effect of soil in aqueous samples and the effect of Tergitol NP-10 on substrate biodegradation rates were also evaluated. Biodegradation kinetics was evaluated for 36 hours, every 6 hours. Benzene and o-xylene biodegradation followed a first-order one-phase kinetic model, whereas toluene and ethylbenzene biodegradation was well described by a first-order two-phase kinetic model in all samples. MTBE followed a zero-order removal kinetic model in all samples. The presence of soil in aqueous samples retarded BTE-oX removal rates, with the highest negative effect on o-xylene. The presence of soil enhanced MTBE removal rate. The addition of Tergitol NP-10 to aqueous samples containing soil had a positive effect on substrate removal rate in all samples. Substrate percent removals ranged from 95.4-99.7% for benzene, toluene and ethylbenzene. O-xylene and MTBE percent removals ranged from 55.9-90.1% and 15.6-30.1%, respectively.

The Co-Metabolic Biodegradation Kinetic Models of a Chlorinated Alkene with Mutagenicity, Carcinogenicity and Teratogenicity by Two Strains of Aerobic Bacteria

2011 ◽  
Vol 138-139 ◽  
pp. 1040-1049
Author(s):  
Hai Tao Shang ◽  
Qi Yang ◽  
Yang Zhang
Keyword(s):  
Kinetic Models ◽  
Removal Rate ◽  
Environmental Pollutant ◽  
Aerobic Bacteria ◽  
Specific Substrate ◽  
Biodegradation Kinetics ◽  
Monod Model ◽  
Substrate Removal ◽  
Haldane Model ◽  
Kinetics Of

Purpose 1,1-DCE is a environmental pollutant of mutagenicity, carcinogenicity and teratogenicity. This paper studied the biodegradation of 1,1-DCE by two strains of aerobic bacteria which use benzene as co-metabolic substrate. Procedures First the two strains were activated, then through batch experiments, the residual concentrations of 1,1-DCE were monitored. Methods The biodegradation rates were determined, and the varying trends of the biodegradation rates with the initial concentrations were fitted by some kinetic models. Results The biodegradation kinetics of 1,1-DCE by the strain DB–I fits Monod Model, the corresponding parameters are νmax=0.015h-1, Ks＝10.18 mg·L-1, while the biodegradation kinetics by strain DB-M fits Haldane Model, and the parameters respectively are νmax=0.0063h-1, Ks=4.55mg·L-1，Ki=13.09mg·L-1. Conclusion The specific substrate removal rate constant of 1,1-DCE by strain DB–I is higher than that of strain DB–M, and they are both higher than those of the studies performed by other authors.

Kinetics of Fecal Coliform Removal in Constructed Wetlands

1999 ◽  
Vol 40 (3) ◽  
pp. 109-116 ◽  
Author(s):  
N. R. Khatiwada ◽  
C. Polprasert
Keyword(s):  
Kinetic Model ◽  
Constructed Wetlands ◽  
Fecal Coliform ◽  
Removal Rate ◽  
Free Water ◽  
Pilot Scale ◽  
Performance Data ◽  
Rate Coefficients ◽  
Model Parameters ◽  
Kinetics Of

Major mechanisms influencing the removal of fecal microorganisms in constructed wetlands treating sewage in tropical regions include the effects of temperature, solar radiation, sedimentation, adsorption and filtration. This study aims to develop a model describing the kinetics of fecal coliform removal in free-water-surface (FWS) constructed wetlands. Separate model equations were proposed for removal rate coefficients for each of the major removal mechanisms. The model parameters were assessed from both literature and the performance data of laboratory-scale FWS constructed wetland units planted with cattails (Typha angustifolia). The model parameters and the kinetic model were validated with experimental data of two pilot-scale constructed wetlands. Statistical analyses of the calculated and observed performance data of the pilot-scale units revealed good correlation and were without significant practical difference, suggesting the kinetic model was feasible.

Biodegradation kinetics of benzene, toluene and xylene compounds: microbial growth and evaluation of models

2015 ◽  
Vol 38 (7) ◽  
pp. 1233-1241 ◽  
Author(s):  
Vódice Amoroz Feisther ◽  
Antônio Augusto Ulson de Souza ◽  
Daniela Estelita Goes Trigueros ◽  
Josiane Maria Muneronde de Mello ◽  
Déborade de Oliveira ◽  
...  
Keyword(s):  
Microbial Growth ◽  
Biodegradation Kinetics ◽  
Benzene Toluene ◽  
Kinetics Of

scholarly journals Comparative Study on Refractory Gold Concentrate Kinetics and Mechanisms by Pilot Scale Batch and Continuous Bio-Oxidation

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1343
Author(s):  
Zhong-Sheng Huang ◽  
Tian-Zu Yang
Keyword(s):  
Mine Drainage ◽  
Removal Rate ◽  
Sulfur Removal ◽  
Sulfuric Acid Concentration ◽  
Gold Recovery ◽  
Removal Rates ◽  
Oxidation Activity ◽  
H2so4 Concentration ◽  
Refractory Gold ◽  
Kinetics Of

Most studies conducted have focused on the pulp density, Fe3+ concentration and sulfuric acid concentration, etc., of bio-oxidation, and few have reported on the influence of different bio-oxidation methods on kinetics. In this study, a comparative investigation on refractory gold concentrate by batch and continuous bio-oxidation was conducted, with the purpose of revealing the kinetics influence. The results showed that improving the removal rates of the gold-bearing pyrite (FeS2) and arsenopyrite (FeAsS) yielded the best results for increasing gold recovery. The removal rates of S, Fe and relative gold recovery linearly increased when compared to the second-order equation increase of the As removal rate in both batch and continuous bio-oxidation processes. The removal kinetics of S and Fe by continuous bio-oxidation was 12.02% and 12.17% per 24 h day, approximately 86.64% and 51.18% higher than batch bio-oxidation, respectively. The higher removal kinetics of continuous bio-oxidation resulted from a stepwise increase in microbe growth, a larger population and higher dissolved Fe3+ and H2SO4 concentration compared to a linear increase by batch bio-oxidation. The cyanidation gold recovery was as high as 94.71% after seven days of continuous bio-oxidation, with the gold concentrate sulfur removal rates of 83.83%; similar results will be achieved after 13 days by batch bio-oxidation. The 16sRNA sequencing showed seven more microbe cultures in the initial residue than Acid Mine Drainage (AMD) at genus level. The quantitative real-time Polymerase Chain Reaction (PCR) test showed the four main functional average microbe populations of Acidithiobacillus, Leptospirillum, Ferroplasma and Sulfobacillus in continuous bio-oxidation residue as 1.08 × 103 higher than in solution. The multi-microbes used in this study have higher bio-oxidation activity and performance in a highly acidic environment since some archaea co-exist and co-contribute.

scholarly journals Microbial Kinetic Analysis of a Hybrid UASB Reactor

2020 ◽  
Keyword(s):  
Removal Rate ◽  
Second Order ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Hybrid Reactor ◽  
Anaerobic Sludge ◽  
Microbial Kinetics ◽  
Substrate Removal ◽  
Anaerobic Sludge Blanket ◽  
Kinetics Of

<p>Microbial kinetics of a hybrid upflow anaerobic sludge blanket (UASB) reactor were investigated when treating chemical synthesis–based pharmaceutical wastewater. Monod, Grau first-order, Grau second-order, Stover-Kincannon, Chen &amp; Hashimoto kinetic models were applied to the hybrid reactor. The second-order model was found to be the most appropriate model for the hybrid reactor (R2 = 0.99) and offers the best description of the process. The substrate removal rate constant (k2S) was found to be 4.91 d-1.</p>

Biofilm Structure – An Important and Neglected Parameter in Waste Water Treatment

1989 ◽  
Vol 21 (8-9) ◽  
pp. 805-814 ◽  
Author(s):  
F. R. Christensen ◽  
G. Holm Kristensen ◽  
J. la Cour Jansen
Keyword(s):  
Wastewater Treatment ◽  
Structural Changes ◽  
Waste Water Treatment ◽  
Experimental Investigations ◽  
Biofilm Reactors ◽  
Substrate Removal ◽  
Treatment Processes ◽  
Laboratory Reactor ◽  
Biofilm Structure ◽  
Kinetics Of

Experimental investigations on the kinetics of wastewater treatment processes in biofilms were performed in a laboratory reactor. Parallel with the kinetic experiments, the influence of the biofilm kinetics on the biofilm structure was studied at macroscopic and microscopic levels. The close interrelationship between biofilm kinetics and structural changes caused by the kinetics is illustrated by several examples. From the study, it is evident that the traditional modelling of wastewater treatment processes in biofilm reactors based on substrate removal kinetics alone will fail in many cases, due to the inevitable changes in the biofilm structure not taken into consideration. Therefore design rules for substrate removal in biofilms used for wastewater treatment must include correlations between the removal kinetics and the structure and development of the biological film.

Sign in / Sign up

Export Citation Format

Share Document