Search for: bioremediation
0.006 seconds
Total 42 records

    Bioremediation of Contaminated Soil by Hydrocarbon

    , M.Sc. Thesis Sharif University of Technology Asgharzadeh, Ahmad (Author) ; Shaygan, Jalaloddin (Supervisor)
    This research was done in order to test the capability of endemic microorganisms in treating hydro-carbonic pollutants found in the soil specimens of Assaluye industrial region. To find the optimum conditions for treating the contaminations, we tried several amounts of substrate as well as temperature and humidity. The total concentration of hydrocarbon compounds in polluted soil samples was measured by both infrared spectrometry and gas chromatography, in treatment process after extraction. The results show that, having 50mg substrate per 1kg of contaminated soil added and keeping humidity at 11%, in a 60-days course the level of initial pollution decreased by 60%. 10 degrees increase in... 

    A Study of Practical Methods for Petroleum Hydrocarbons Removal from Polluted Groundwaters in a Refinery

    , M.Sc. Thesis Sharif University of Technology Safdari, Mohammad Saeed (Author) ; Kariminia, Hamid Reza (Supervisor)
    Petroleum based products are the major sources of energy for industry and daily life, With the development of social economy, the demands of the oil have increased dramatically. Petroleum hydrocarbons can cause environmental pollution during various stages of production, transportation, refining and use. Releases of petroleum products(e.g., gasoline, diesel, fuel oil) from aboveground and underground storage tanks or transport pipelines are the major causes of the environment pollution.The major constituents of petroleum hydrocarbons are biodegradable. Many soil microorganisms transform oil hydrocarbons into nontoxic compounds or mineralize them to inorganic compounds. In situ... 

    Application of power law logistic model to growth kinetics of bacillus licheniformis MS3 on a water- insoluble substrate

    , Article Chemical Engineering Communications ; Volume 201, Issue 11 , 06 June 2014 , Pages 1514-1525 Biria, D ; Maghsoudi, E ; Roostaazad, R ; Sharif University of Technology
    The power law logistic model was utilized to investigate the growth of a hydrocarbon assimilating bacterium on a water-insoluble substrate. To achieve this end, population dynamics of Bacillus licheniformis MS3 in a medium containing n-decane as the sole carbon source was monitored for 30 h. Different initial biosurfactant concentrations and shaking rates were employed to examine the role of mass transfer in the cell growth and the consequent hydrocarbon biodegradation. The amount of n-decane degraded in the system was detected by gas chromatography at the end of the incubation period. The results revealed that when mass transfer limitations were lessened through addition of an initial... 

    Biodegradation of 4-chlorobenzoic acid by lysinibacillus macrolides DSM54T and determination of optimal conditions

    , Article International Journal of Environmental Research ; Volume 14, Issue 2 , 2020 , Pages 145-154 Samadi, A ; Sharifi, H ; Ghobadi Nejad, Z ; Hasan Zadeh, A ; Yaghmaei, S ; Sharif University of Technology
    Springer  2020
    Chlorobenzoic acids (CBAs) are recalcitrant and toxic materials which enter the environment directly using pesticides and herbicides, or indirectly through the biodegradation of polychlorinated biphenyl (PCB) compounds. In the conducted study, biodegradation of 4-chlrobenzoic acid was investigated by Lysinibacillus macrolides DSM54T, which had previously been isolated from PCB-polluted soils. Environmental factors including pH, temperature, 4-CBA concentration and inoculation percentage were optimized using response surface methodology (RSM). 58 experiments were designed according to Historical Data, because of the arbitrary selection of experiments, and the combined effects of the... 

    Bioelectricity Generation in a Soil Microbial Fuel Cell with Biocathode Denitrification

    , Article ; Volume 37, Issue 19 , 2015 , Pages 2092-2098 ; 15567036 (ISSN) Afsham, N ; Roshandel, R ; Yaghmaei, S ; Vajihinejad, V ; Sherafatmand, M ; Sharif University of Technology
    Taylor and Francis Inc  2015
    A soil microbial fuel cell was investigated that uses soil and groundwater to generate electricity. The cathode surface area and materials are always important for increasing power. Power density was shown to be a linear function of cathode surface area. Biofilm formation on the graphite cathode was observed to be helpful in enhancing power output and maximum performance reached 89.2 mW/m2. As an application for the insertion-type soil microbial fuel cell, nitrate removing was investigated in cathode. Nitrate was reduced in an aerobic cathode at the rate of 37.5 mg nitrate/lit/day and 55 mg nitrate/lit/day in anaerobic cathode  

    The use of halophytic plants for salt phytoremediation in constructed wetlands

    , Article International Journal of Phytoremediation ; Volume 19, Issue 7 , 2017 , Pages 643-650 ; 15226514 (ISSN) Farzi, A ; Borghei, S. M ; Vossoughi, M ; Sharif University of Technology
    Taylor and Francis Inc  2017
    This research studied the use of constructed wetlands (CWs) to reduce water salinity. For this purpose, three halophytic species of the Chenopodiaceae family (Salicornia europaea, Salsola crassa, and Bienertia cycloptera) that are resistant to saline conditions were planted in the CWs, and experiments were conducted at three different salinity levels [electrical conductivity (EC)~2, 6, 10 dS/m]. EC and concentrations of calcium (Ca), magnesium (Mg), sodium (Na), and chlorine (Cl) were measured before and after phytoremediation with a retention time of 1 week. The results suggested that these plants were able to grow well and complete their life cycles at all the salinity levels within this... 

    Environmental impact assessment modeling in an urban man-made lake using fuzzy logic

    , Article Journal of Food, Agriculture and Environment ; Volume 7, Issue 3-4 , 2009 , Pages 811-814 ; 14590255 (ISSN) Jassbi, J ; Nouri, J ; Abbaspour, M ; Varshosaz, K ; Jafarzadeh, N ; Sharif University of Technology
    Environmental impact assessment essentially depends on diverse closely connected components and variables. For this purpose, identification of the whole components is fundamentally required. This study aims to investigate environmental impact assessment of an urban man-made lake in the western part of Tehran, based on recognition of affecting components and their reciprocal effects. Since the components are not constant during the time, thus throughout the environmental impact assessment modeling study, dynamism of the relation between the components should be considered. Regarding insufficiency and uncertainty of information, an analytical method, based on expert's opinion can be applied.... 

    MTBE Bioremediation Using Ps. Putida

    , M.Sc. Thesis Sharif University of Technology Rahbarsafa, Omid (Author) ; Yaghmaei, Soheila (Supervisor)

    A Study on Soil Microbial Fuel Cell for Producing Energy and Bioremediation

    , M.Sc. Thesis Sharif University of Technology Afsham, Neda (Author) ; Yaghmaei, Soheila (Supervisor) ; Roshandel, Ramin (Supervisor)
    With the current demands in alternative methods of energy production and increased utilization of existing energy sources, microbial fuel cells have become an important field of research. In a microbial fuel cell, organic and inorganic compounds can be oxidized by microbial catabolism at the anode to generate direct electricity. A kind of microbial fuel cell (MFC) is sediment microbial fuel cell (SMFC) consists of an anode electrode embedded in the anaerobic sediment and a cathode electrode suspended in the overlying aerobic water. microorganisms produce electrons by oxidation of organic or inorganic compounds in the sediment at anode electrode, while oxygen is reduced in the water by... 

    Experimental Study and Optimization of Bioremediation of PAHs by Newly Isolated Thermophilic Filamentous Fungi in Slurry Bioreactor

    , M.Sc. Thesis Sharif University of Technology Sarayloo, Ehsan (Author) ; Vossoughi, Manouchehr (Supervisor) ; Alemzadeh, Iran (Supervisor)
    Sustainable development requires the development and promotion of environmental management and a constant search for green technologies to treat a wide range of aquatic and terrestrial habitats contaminated by increasing anthropogenic activities. In this work we investigated the ability of four previously isolated fungi, BBRC 9057, BBRC 20020, BBRC 9058 and BBRC 9002, in degradation of polycyclic (PAHs) and the effect of UV irritation on fungi cell growth and degradation of PAHs. Also we studied the degradation of anthracene by thermophilic filamentous fungi in liquid and soil slurry bioreactor. Cell growth and anthracene degradation ability of BBRC 9057 increased 6.51 and 1.82 times rather... 

    Biodegradation of Polycyclic Aromatic Hydrocarbons in a New Reactor

    , M.Sc. Thesis Sharif University of Technology Samiee Gohar, Mohammad Reza (Author) ; Molaei Dehkordi, Asghar (Supervisor) ; Arabian, Daryoush (Co-Advisor)
    TPPB are characterized by a cell-containing aqueous phase, and an immiscible and biocompatible organic phase that partitions toxic/insoluble substrates to the cells base on their metabolic demand and the thermodynamic equilibrium of the system. Surface areas, Mass transfer coefficient, Hydrophobicity of polycyclic aromatic hydrocarbons (PAH) are considered as limitation in two phase partition bioreactors (TPPB). For solving of this challenge, in this project used solid particle for increment of mss transfer and surface area, and also solid particles can eliminate limitation of initial concentration of polycyclic aromatic hydrocarbon and ratio of aqueous/organic phases. Naphthalene is used as... 

    Experimental Removal of Diesel in Soil Using Indigenous Microorganisms Isolated Iran

    , M.Sc. Thesis Sharif University of Technology Rezaei, Nader (Author) ; Kariminia, Hamidreza (Supervisor) ; Yaghmaei, Soheila (Supervisor)
    Crude oil and petroleum products at the time of extraction, production and transportation cause serious contaminations in soil, water and environment. Biological methods have shown a promising effect for the cleanup of these hydrocarbon pollutants. Bioremediation employs the metabolic activity of microorganisms capable of using oil as their energy and carbon source. Biological methods are also less expensive than other cleanup technologies such as incineration and landfill. Large number of microbial stains have been discovered in nature, capable to degrade oil and petroleum products. Biological cleaning of oil contamination by microorganisms occurs naturally in the environment. It has been... 

    Bioremediation of Gas Condensate Contaminated Soil of Sarkhun Refinery

    , M.Sc. Thesis Sharif University of Technology Yusefnejad Kebriya, Mohammad Saleh (Author) ; Shaygan, Jalaloddin (Supervisor)
    Goal of this project was study of local microorganism ability in remediation of hydrocarbon contamination exists in contaminated soil around Sarkhun refinery.In first phase of this study, evaluation of bioremediation performance was done. Using a standard method in a 20 days period, the ability of local microorganism exists in contaminated soil was studied. In this study, 3 different nutrient ratios for 7 samples, 21 experimental samples, were used. Nutrient ratios as C:N:P were: 100:0:0, 100:5:1, and 100:9:1. Results showed that in this remediation period, minimum remediation efficiency in all samples with nutrients is 50% and also the best nutrient ration is 100:5:1. An empirical model was... 

    Preparation of Suitable Foam for Bioremediation of Oil

    , M.Sc. Thesis Sharif University of Technology Hajipoor Esfeden, Hajar (Author) ; Roosta Azad, Reza (Supervisor) ; Moosavi, Abbas (Supervisor) ; Hesampour, Mehrdad (Co-Advisor)
    When oil spill take place, it should be removed rapidly. For control of oil pollution, polymeric foams that absorb oil highly, can be used. These foams are polyurethane and polypropylene that float on water and absorb several times their own weight of crude oil. When a thin layer of crude oil remained on water, it couldn’t be separated by chemical and physical methods. In this cases biological methods will be best and suitable. Therefore absorption and biodegradation of oil spill are executed by immobilization of suitable microorganism on polyurethane foam. But current polyurethane foams aren’t biodegradable so this incompetence should be solved. Polyurethane foams compose of two basic... 

    Development of a Multi-functional Soil Column for Studying Bioremediation and Multiphase Flow

    , M.Sc. Thesis Sharif University of Technology Samari, Peyman (Author) ; Sadeghi, Hamed (Supervisor)
    Soil and water pollution is one of the most common types of pollution in terrestrial and aquatic ecosystems. The development of mines and the oil and petrochemical industry on one hand and the non-compliance with environmental requirements on the other hand have caused large amounts of hydrocarbon pollutants and heavy metals to enter the environment in recent decades. Petroleum materials and heavy metals leak into the surrounding environment during drilling and extraction in oil sites and mines or during land and sea transportation, despite the measures taken to control their pollution. The conducted studies show that human industrial activities are the only cause of environmental pollution... 

    Physical Modeling of Bioremediation of Gasoline Spill in the Vadose Zone

    , M.Sc. Thesis Sharif University of Technology Rahimi, Behnam (Author) ; Sadeghi, Hamed (Supervisor) ; Moghimi, Hamid (Co-Supervisor)
    Oil pollutants are among the important sources of pollution in countries with oil and gas industries such as Iran. Soil pollution by these pollutants is one of the environmental issues and hazards. All kinds of organic and inorganic pollutants in the soil may penetrate the underground water or enter the atmosphere in the form of gas, which respectively enters the food chain through absorption by plants or enter the body of living organisms through breathing. They include humans, which are a threat to the health and life of living beings. For example, many of these pollutions cause diseases such as cancer, suppression of the body's immune system, or even obesity; therefore, it is necessary to... 

    Potential of Calendula alata for phytoremediation of stable cesium and lead from solutions

    , Article Environmental Monitoring and Assessment ; Volume 181, Issue 1-4 , Oct , 2011 , Pages 63-68 ; 01676369 (ISSN) Borghei, M ; Arjmandi, R ; Moogouei, R ; Sharif University of Technology
    Calendula alata plants were tested for their potential to remove stable cesium and lead from solutions in a 15-day period. The plants were grown hydroponically and placed in solutions containing CsCl and Pb(C 2H 3O 2)2 at different concentrations (0.6, 2 and 5 mg l-1). When plants were incubated in CsCl solutions 46.84 ± 2.12%, 41.35 ± 1.59%, and 52.06 ± 1.02% cesium was found to be remediated after 15 days. Moreover, more than 99% lead was removed from the Pb(C 2H 3O 2)2solution in all three concentrations after 15 days during the same period. When both CsCl and Pb(C 2H 3O 2)2were supplemented together in the solution, 9.92 ± 1.22%, 45.56 ± 3.52%, and 46.16 ± 1.48% cesium and 95.30 ± 0.72%,... 

    Enhanced soil remediation via plant-based surfactant compounds from acanthophyllum laxiusculum

    , Article Tenside, Surfactants, Detergents ; Volume 53, Issue 4 , 2016 , Pages 324-331 ; 09323414 (ISSN) Soltaninejad, H ; Bagheri Lotfabad, T ; Yaghmaei, S ; Sharif University of Technology
    Carl Hanser Verlag 
    In the present study, an aqueous root-extract of Acanthophyllum laxiusculum (AREAL) was evaluated for phenanthrene removal from two samples of contaminated soil. AREAL showed a linear solubilization enhancement for phenanthrene with a weight solubilization ratio of 0.05. Batch soil washing experiments caused the removal of phenanthrene with efficiencies of 96.7% and 78% from soils with 0.78% and 2.73% organic carbon, respectively. Desorption kinetics of phenanthrene exhibited a twophase pattern, namely, a rapid release as the initial phase and a slower removal as a subsequent phase. A two-compartment exponential model could adequately represent the two phases of the kinetic pattern of... 

    ANFIS modeling of rhamnolipid breakthrough curves on activated carbon

    , Article Chemical Engineering Research and Design ; Volume 126 , 2017 , Pages 67-75 ; 02638762 (ISSN) Baghban, A ; Sasanipour, J ; Haratipour, P ; Alizad, M ; Vafaee Ayouri, M ; Sharif University of Technology
    Institution of Chemical Engineers  2017
    Owning to interesting properties of biosurfactants such as biodegradability and lower toxicity, they have broad application in the food industry, healthy products, and bioremediation as well as for oil recovery. The present study was aimed to develop a GA-ANFIS model for predicting the breakthrough curves for rhamnolipid adsorption over activated carbon. To that end, a set of 296 adsorption data points were utilized to train the proposed FIS structure. Different graphical and statistical methods were also used to evaluate the model's accuracy and reliability. Results were then compared to those of the previously reported Artificial Neural Network (ANN) and Group Method Data Handling (GMDH)... 

    Biodegradation of polychlorinated biphenyls by lysinibacillus macrolides and bacillus firmus isolated from contaminated soil

    , Article International Journal of Engineering, Transactions B: Applications ; Volume 32, Issue 5 , 2019 , Pages 628-633 ; 1728144X (ISSN) Samadi, A ; Sharifi, H ; Ghobadi Nejad, Z ; Yaghmaei, S ; Sharif University of Technology
    Materials and Energy Research Center  2019
    Polychlorinated biphenyls (PCBs) cause many significant ecological problems because of their low degradability, high harmfulness, and solid bioaccumulation.Two bacterial strains were isolated from soil that had been polluted with electrical transformer liquid for more than 40 years. The isolates were distinguished as Lysinibacillus macrolides DSM54Tand Bacillus firmus NBRC15306Tthrough 16S rRNA sequencing analysis.This is the primary report of an agent of the genus Bacillus firmus equipped for the removal of PCBs. The strains could develop broadly on 2-Chlorobiphenyl and 2,4-dichlorobiphenyl. GC/MS analysis of individual congeners revealed up to 80% degradation of the xenobiotics in 96h,...