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Application of an immobilized microbial consortium for the treatment of pharmaceutical wastewater: Batch-wise and continuous studies

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Chinese Journal of Chemical Engineering 2021年第1期34卷 391-400页

作者： Shabnam Murshid Gnana Prakash Dhakshinamoorthy Department of Chemical Engineering SSN College of EngineeringKalavakkamTamil Nadu 603110India

In the present investigation,a microbial consortium consisting of four bacterial strains was selected for the treatment of pharmaceutical industry wa *** consortium was immobilized on a natural support matrixLuffa and used for the treatment of real-time pharmaceutical wastewater in batch and continuous *** batch process was carried out to optimize the culture conditions and monitor the enzymatic *** array of enzymes such as alcohol dehydrogenase,aldehyde dehydrogenase,monooxygenase,catechol 2,3-dioxygenase and hydroquinol 1,2-dioxygenase were produced by the *** kinetics of the degradation in the batch process was analyzed and it was noted to be a first-order *** the continuous study,an aerobic fixed-film bioreactor(AFFBR) was utilized for a period of 61 days with variable hydraulic retention time(HRT) and organic loading rate(OLR).The immobilized microbes treated the wastewater by reducing the COD,phenolic contaminants and suspended *** OLR ranged between(0.56±0.05) kg COD·m^(-3) d^(-1) to 3.35 kg COD·m^(-3)·d^(-1) and the system achieved an average reduction of 96.8% of COD,92.6% of phenolic compounds and 95.2% of suspended *** of the continuous process was interpreted by three different models,where the modified Stover Kincannon model and the Grau second-order model proved to be best fit for the degradation reaction with the constant for saturation value,k_(L) being 95.12 g·L^(-1)·d^(-1).the constant for maximum utilization of the substrate U_(max) being 90.01 g·L^(-1) d^(-1) and substrate removal constant KY was1.074 d^(-1) for both the ***-MS analysis confirmed that most of the organic contaminants were degraded into innocuous metabolite s.

关键词： Pharmaceutical wastewater microbial consortium Immobilization Batch study Fixed film bioreactor Kinetic studies

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Co-metabolic and biochar-promoted biodegradation of mixed PAHs by highly efficient microbial consortium QY1

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Journal of Environmental Sciences 2021年第9期33卷 65-76页

作者： Min Li Hua Yin Minghan Zhu Yuanyuan Yu Guining Lu Zhi Dang Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters School of Environment and EnergySouth China University of TechnologyGuangdong 510006China Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyGuangdong 525000China

Polycyclic aromatic hydrocarbons(PAHs), typical representatives of the persistent organic pollutants(POPs), have become ubiquitous in the *** this study, a novel microbial consortium QY1 that performed outstanding PAHs-degrading capacity has been *** degradation characteristics of single and mixed PAHs treated with QY1 were studied, and the effect of biochar on biodegradation of mixed PAHs and the potential of biochar in PAHs-heavy metal combined pollution bioremediation were also *** showed that, in single substrate system, QY1 degraded 94.5% of 500 mg/L phenanthrene(PHE) and 17.8% of 10 mg/L pyrene(PYR) after 7 days, while in PHE-PYR mixture system, the biodegradation efficiencies of PHE(500 mg/L) and PYR(10 mg/L) reached 94.0%and 96.2%, respectively, since PHE served as co-metabolic substrate to have significantly improved PYR ***, with the cooperation of biochar, the biodegradations of PHE and PYR were greatly ***, biochar could reduce the adverse impact of heavy metals(Cd^(2+), Cu^(2+), Cr_(2)O_(7)^(2-)) on PYR biodegradation *** sequencing analysis revealed that Methylobacterium, Burkholderia and Stenotrophomonas were the dominant genera of QY1 in almost all treatments, indicating that these genera might play key roles in PAHs ***, this study provided new insights into the efficient bioremediation of PAHs-contaminated site.

关键词： Polycyclic aromatic hydrocarbons microbial consortium Co-metabolism Biochar Heavy metals microbial community

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Kinetics and characteristics of phenanthrene degradation by a microbial consortium

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Petroleum Science 2008年第1期5卷 73-78页

作者： Wang Jing Xu Hongke An Mingquan Yan Guiwen School of Chemical Science ＆ Engineering China University of Petroleum Beijing 102249 China

The kinetics and characteristics of phenanthrene degradation by a microbial consortium W4 isolated from Henan Oilfield were investigated. The degradation percentage of solid phenanthrene at 200 mg/L in liquid medium after 6 days of incubation was higher than 95% under the condition of 37 ℃ and 120 r/min by this microbial consortium. The degradation of phenanthrene could be fitted to a first-order kinetic model with the half-life of 1.25 days. The optimum conditions for degradation ofphenanthrene by consortium W4 were as follows： temperature about 37℃, pH from 6.0 to 7.0 and salinity about 8.0 g/L. It was concluded that microbial consortium W4 might degrade phenanthrene via both salicylic acid and o-phthalic acid pathways by analyzing products with GC-MS.

关键词： Phenanthrene biodegradation kinetics microbial consortium

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Optimization of fermentation factors to enhance rice straw degradation ability using a microbial consortium LZF-12

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International Journal of Agricultural and Biological Engineering 2019年第3期12卷 168-173页

作者： Guoxiang Zheng Chenyang Zhou Ting Yin Zhaoxin Lu Shuang Ai College of Engineering Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Pig-breeding Facilities Engineering Ministry of Agriculture and Rural AffairsHarbin 150030China Heilongjiang Key Laboratory of Technology and Equipment for the Utilization of Agricultural Renewable Resources Harbin 150030China

Biological pretreatment has broad application prospects in agricultural waste treatment because of its economic benefits,environmental protection and energy saving *** this study,a microbial consortium LZF-12 was applied for a biological pretreatment to degrade rice *** experiments were performed under hydrolysis conditions by using the method of Box-Behnken factorial design(BBD).The results showed that the model multiple correlation coefficient R2 was 0.9816,and the effects of three factors on the degradation of rice straw of LZF-12 as descending order were the initial rice content,chicken manure content,and initial pH *** interaction between straw concentration,chicken manure concentration,and initial pH value had significant effects on the degradation of a microbial *** the optimum conditions of 0.86%rice straw,0.5%chicken manure and the initial pH value of 7.0,the degradation rate of rice straw reached 72.4%.There is only a small difference of 0.55%between the experimental value and predicted value from BBD ***,it is feasible for the established model due to the consistent results between the prediction and experimental *** microbial consortium LZF-12 has high cellulase enzyme activities and degradation ability over a wide range of temperature and pH value,indicating that it has a good development potential and application prospects in waste biodegradation and biomass energy production.

关键词： microbial consortium biological pretreatment biodegradation rice straw optimization

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Development and characterization of a functional microbial consortium for crude oil degradation

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Journal of Southeast University(English Edition) 2021年第4期37卷 388-393页

作者： Zhu Chongzhi Zhang Xiaodong Sun Liwei Zhan Manjun Long Tao Yu Ran School of Energy and Environment Southeast UniversityNanjing 210096China Nanjing Institute of Environmental Sciences of Ministry of Ecology and Environment Nanjing 210019China Nanjing Research Institute of Environmental Protection Nanjing 210013China

Crude oil-degrading microbial consortia were enriched from three oil-contaminated sites to achieve the efficient biodegradation of crude oil,especially its refractory *** gravimetric method was used to analyze the degradation efficiency of the enriched consortia and changes in the fractions of the crude *** effects of changes in environmental factors were also studied to determine the optimal oil-reducing conditions and assess the dominant bacteria of the mixed *** show that all three consortia exhibit reliable crude oil-biodegradation abilities and that their mixture results in biodegradation rate are as high as(48.0±3.5)%over 30 d of *** consortium mixture can degrade 11.1%of the refractory resins,79.7%of the saturated hydrocarbons,and 45.7%of the aromatics in crude *** pH,an incubation temperature of 30℃,and low mineral salt concentrations(0.8%to 4.0%)are optimal for crude oil *** dominant genera in the consortium mixture include Pseudomonas,Stenotrophomonas,Brucella,Serratia,Brevundimonas,and *** richness and diversity of the microbial community in the consortium remain stable during crude oil ***,microbial enrichment from multiple sources may be performed to construct a mixed consortium for crude oil pollution bioremediation.

关键词： crude oil biodegradation microbial consortium refractory residues

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Stability Analysis of a Lignocellulose Degrading microbial consortium

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Journal of Northeast Agricultural University(English Edition) 2018年第1期25卷 55-61页

作者： Zheng Guo-xiang Li Jian Zhou Chen-yang Chong Yu-ting College of Engineering Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Pig-breeding Facilities Engineering Ministry of AgricultureHarbin 150030China Heilongjiang Key Laboratory of Technology and Equipment for the Utilization of Agricultural Renewable Resources Harbin 150030China

An active mesophilic lignocellulose degrading microbial consortium, designated LZF-12, was bred from humus-rich soil by successive subcultivation under facultative aerobic static condition. Batch experiments were performed to investigate the structural and functional stability of lignocellulose degradation of rice straw of 10 g · L-1. The results showed that efficient degradation of rice straw(>70%) could be achieved and acetic acid concentration accounted for over 70% of total aqueous products from different generations by microbial consortium LZF-12 within 7 days. Denaturing gradient gel electrophoresis(DGGE) and sequencing of 16 S r DNA sequences amplified from the total consortium DNA representing the presence of sequences were related to those of Clostridium, Clostridium cellulolyticum, Pseudomonas, Acetivibrio and some uncultured bacteria in LZF-12. DGGE pattern profiles from different LZF-12 generations were reproducible, suggesting the relative stabilities of the microbial community structure and succession mechanism in the established consortium.

关键词： microbial consortium rice straw degradation stability

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Determination of growth kinetics of microorganisms linked with 1,4-dioxane degradation in a consortium based on two improved methods

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Frontiers of Environmental Science & Engineering 2022年第5期16卷 97-107页

作者： Yi Xiong Boya Wang Chao Zhou Huan Chen Gang Chen Youneng Tang Department of Civil and Environmental Engineering FAMU-FSU College of EngineeringFlorida State UniversityTallahasseeFL 32310USA Geosyntec Consultants Inc. Huntington BeachCA 92648USA National High Magnetic Field Laboratory TallahasseeFL 32310USA

The conventional method for determining growth kinetics of microbial consortia relies on the total biomass *** may be inaccurate for substrates that are uncommon in nature and can only be degraded by a small portion of the microbial community.1,4-dioxane,an emerging contaminant,is an example of such *** this work,we evaluated an improved method for determining the growth kinetics of a 1,4-dioxane-degrading microbial *** the improved method,we considered only bacterial taxa whose concentration increase correlated to 1,4-dioxane concentration decrease in duplicate microcosm *** PEST(Parameter Estimation),a modelindependent parameter estimator,the kinetic constants were estimated by fitting the Monod kineticsbased simulation results to the experimental data that consisted of the concentrations of 1,4-dioxane and the considered bacterial *** estimated kinetic constants were evaluated by comparing the simulation results with experimental results from another set of microcosm *** evaluation was quantified by the sum of squared relative residual,which was four orders of magnitude lower for the improved method than the conventional *** further dividing the considered bacterial taxa into oligotrophs and copiotrophs,the sum of squared relative residual further decreased.

关键词： Biodegradation 1,4-Dioxane Kinetics microbial consortium 16S rRNA

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Bio-Enrichment of Waste Crude Oil Polluted Soil:Amended with Bacillus 139SI and Organic Waste

Bio-Enrichment of Waste Crude Oil Polluted Soil:Amended with...

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作者： Arezoo Dadrasnia Salmah Binti Ismail Institute of Biological Sciences Faculty of ScienceUniversity of Malaya

Biodegradation of waste crude oil contaminated soil amended by Bacillus 139 SI and used tea leaf amendments was investigated to determine the rate of hydrocarbon remediation. Previously, Bacillus 139 SI was isolated from an agricultural soil in the Serdang agricultural center, Malaysia. Within 60 days, 14% oil loss was recorded in unamended polluted autoclaved soil, while waste crude oil disappeared more rapidly in the soil amendment with both strain and organic waste, recorded above 89%. Utilizing bacteria counts were significantly higher in all amended treatments comparing to control soil. Dehydrogenase activity in soil was markedly enhanced by the application of amendments. Waste crude oil composition monitored by GC/FID indicated complete degradation of n-C–C. First-order kinetic model revealed that organic waste and strain were the best of treatments, with biodegradation rate constant of 0.17 dayand half life of 4 days. The results showed there is potential for tea leaf and Bacillus 139 SI to enhance biodegradation of waste crude oil contaminated soil.

关键词： Bioaugmentation biostimulation microbial consortium organic waste waste crude oil

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