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    Efficiency studies of modified IFAS-OSA system upgraded by an anoxic sludge holding tank

    , Article Scientific Reports ; Volume 11, Issue 1 , 2021 ; 20452322 (ISSN) Fazelipour, M ; Takdastan, A ; Borghei, S. M ; Kiasat, N ; Glodniok, M ; Zawartka, P ; Sharif University of Technology
    Nature Research  2021
    An upgraded integrated fixed-film activated sludge-oxic settling anoxic (IFAS-OSA) system is a new technology for reducing nutrients and excess sludge. The results showed that the average TN removal efficiency of the IFAS-OSA system was gradually increased up to 7.5%, while the PO4–3-P removal efficiency increased up-to 27%, compared with that of the IFAS system. The COD removal efficiency of the IFAS-OSA system was slightly increased up-to 5.4% and TSS removal efficiency increased up to 10.5% compared with the control system. Biomass yield coefficient (Yobs) in the IFAS and IFAS-OSA systems were 0.44 and 0.24 (gr MLSS/ gr COD). Hence, sludge production decreased by 45%. The average SVI was... 

    Ethylene glycol biodegradation in microbial fuel cell

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 38, Issue 8 , 2016 , Pages 1096-1102 ; 15567036 (ISSN) Hosseinpour, M ; Asadi, M ; Rahmani Eliato, T ; Vossoughi, M ; Alemzadeh, I ; Sharif University of Technology
    Taylor and Francis Inc 
    Ethylene glycol is an environmental pollutant, which exists in airport runoff and industrial waste. In this article, biodegradation of ethylene glycol in a two-chamber, batch-mode microbial fuel cell was investigated. Glucose and ethylene glycol at different concentrations were used as carbon and energy sources. Chemical oxygen demand removal in the range of 92-98% indicated that microbial fuel cell can be used for biodegradation of ethylene glycol. Ethylene glycol also improved power generation and the maximum power density was 5.72 mW/m2 (137.32 mW/m3), with respect to the same glucose and ethylene glycol concentrations (500 ppm)  

    Experimental Studies on Various Parametres in Wastewater Treatment by Electrochemical Method

    , M.Sc. Thesis Sharif University of Technology Safari, Sedigheh (Author) ; Roosta Azad, Reza (Supervisor) ; kariminia, Hamid Reza (Co-Advisor)
    Electrocoagulation is one of the new methods for water and wastewater treatment that is carried out by electrical current. This method is easily applicable to a variety of wastewater. it is highly efficient in organic matter removal and other toxic are and dangerous pollutants.
    This study dealt with diesel and COD removal by Electrocoagulation method. Energy consumption, electricity consumption, and the amount of sludge produced by this method was evaluated. Experiments were conducted in a 2 L reactor, consisting aluminum and iron electrodes.The distance between anode and cathode was 5 cm. To evaluate the efficiency of electrocoagulation method, parameters including: pH, time,... 

    Nanofiltration process on dye removal from simulated textile wastewater

    , Article International Journal of Environmental Science and Technology ; Volume 5, Issue 3 , 2008 , Pages 401-408 ; 17351472 (ISSN) Hassani, H ; Mirzayee, R ; Nasseri, S ; Borghei, M ; Gholami, M ; Torabifar, B ; Sharif University of Technology
    CEERS  2008
    Dyestuffs removal from industrial wastewater requires special advanced technologies, since dyes are usually difficult to remove by biological methods. In this study nanofiltration process was used for removal of different dyestuffs from solutions. The rate of dye removal by spiral wound nanofiltration membrane in film thin composite MWCO=90 Dalton, was evaluated for four classes of dyes acidic, disperse, reactive and direct in red and blue dyes medium. Dye absorbance was measured by spectrophotometric method (2120 Standard Method 1998). Effects of feed concentration, pressure and total dissolved solids concentration were also studied. Results showed that increasing dye concentration lead to... 

    Removal of naphthalene from aqueous solutions by phosphorus doped-titanium dioxide coated on silica phosphoric acid under visible light

    , Article Desalination and Water Treatment ; Volume 224 , 2021 , Pages 187-196 ; 19443994 (ISSN) Banaei, B ; Hassani, A. H ; Tirgir, F ; Fadaei, A ; Borghaei, S. M ; Sharif University of Technology
    Desalination Publications  2021
    In this research, titanium dioxide-phosphorus (TiO2-P) immobilized on silica phosphoric acid (SPA) was prepared by a simple modified sol–gel method with SPA as a precursor instead of phosphoric acid. TiO2-P thin film photocatalyst immobilized on SPA as a novel high-efficiency photocatalyst was investigated to remove naphthalene as a toxic compound from wastewater. The novel resulting photocatalyst were characterized by energy-dispersive X-ray (EDX) and X-ray diffraction pattern revealed nano-photocatalyst TiO2-P with the average size of 15–20 nm. EDX analysis showed the presence of phosphorus elements in the crystalline structure of TiO2 and diffuse reflectance spectroscopy showed the energy... 

    Acceleration of Anaerobic Stabilization of Organic Solid Waste &Treatment of Following Sewage by a Biologic Tower

    , M.Sc. Thesis Sharif University of Technology Hassanian, Hamed (Author) ; Hashemian, Jamaleddin (Supervisor) ; Nazari Alavi, Alireza (Supervisor)
    In this project, function of anaerobic digestion of organic waste in liquid phase and treating the following sewage in biologic tower(trickling filter) has been investigated in an experimental process. Solid waste were supplied from sharif university restaurant and after weighting and classification is added to tanks which filled by 40% sludge and 60% water. For controlling the function of biologic tower, a control reactor were used. Retention time for digestion of solid waste is 40 day. First solid loading was 500g and 75g organic waste in main & control reactor equal to 5(kg solid waste)/( m^3.reactor.day) 1.3(kg TS)/( m^3.reactor.day) and were doubled in second loading. It seems that... 

    Removal of Non-biodegradable Contaminants from Colored Textile Wastewater Using Electro Oxidation Process

    , M.Sc. Thesis Sharif University of Technology Eftekhary, Sajjad (Author) ; Borghei, Mehdi (Supervisor) ; Ghasemi, Shahnaz (Supervisor)
    In the present study, the electrochemical oxidation process was introduced as a green process for complete degradation and removal of non-biodegradable pollutants from aquatic environments and effluents of various industries without the need to use chemicals and toxins. Research stages include comprehensive preliminary studies in the field of electrochemistry and wastewater treatment, software design of electro-oxidation reactor using titanium mesh anode and stainless steel cathode mesh inside a body made of polypropylene, designed cell construction and then evaluation of device performance in polluting environment Are different. In software simulation using COMSOL MULTIPHYSICS software, it... 

    Oily wastewater treatment using membrane bioreactor

    , Article International Journal of Global Warming ; Vol. 6, issue. 2-3 , 2014 , pp. 295-302 ; ISSN: 17582083 Safa, M ; Alemzadeh, I ; Vossoughi, M ; Sharif University of Technology
    A novel implementation of a membrane bioreactor (MBR) has been studied in this paper. It is utilised as combination of rotating biological contractor (RBC) and an external membrane for oily wastewater treatment. The performance of MBR was compared with the standalone RBC. The RBC used in this investigation is the same one combined with the membrane to form the MBR. Wastewater biodegradability has been evaluated by two factors: chemical oxygen demand (COD) and total petroleum hydrocarbon (TPH). They are both compared together for different hydraulic retention times (HRTs) and petroleum pollution concentrations in RBC and MBR. The ratio of TPH to COD of molasses has been varied between 0.2 to... 

    An efficient approach to cathode operational parameters optimization for microbial fuel cell using response surface methodology

    , Article Journal of Environmental Health Science and Engineering ; Vol. 12, issue. 1 , 2014 Hosseinpour, M ; Vossoughi, M ; Alemzadeh, I ; Sharif University of Technology
    Background: In the recent study, optimum operational conditions of cathode compartment of microbial fuel cell were determined by using Response Surface Methodology (RSM) with a central composite design to maximize power density and COD removal. Methods: The interactive effects of parameters such as, pH, buffer concentration and ionic strength on power density and COD removal were evaluated in two-chamber microbial batch-mode fuel cell. Results: Power density and COD removal for optimal conditions (pH of 6.75, buffer concentration of 0.177 M and ionic strength of cathode chamber of 4.69 mM) improve by 17 and 5%, respectively, in comparison with normal conditions (pH of 7, buffer concentration... 

    Response surface methodology for modeling and optimizing the treatment of synthetic starchy wastewater using hydrophilic PES membrane

    , Article Desalination and Water Treatment ; Volume 51, Issue 37-39 , 2013 , Pages 7036-7047 ; 19443994 (ISSN) Hedayati Moghaddam, A ; Shayegan, J ; Sargolzaei, J ; Bahadori, T ; Sharif University of Technology
    In this work, the process of starch removal from starchy wastewater using a hydrophilic polyethersulfone membrane was investigated. The pore size of the membrane was 0.65 μm and the pattern of stream in plate and frame handmade membrane module was cross-flow. To design the layout of the experiments, response surface methodology was applied. The performance of the filtration process was evaluated by calculating the (chemical oxygen demand) COD removal percentage (rejection factor) and permeate flux. In this study, five operative parameters were investigated, including trans-membrane pressure, flow rate and temperature of feed, pH, and the COD concentration of starch wastewater. Two models... 

    Removal of lignin, COD, and color from pulp and paper wastewater using electrocoagulation

    , Article Desalination and Water Treatment ; Volume 57, Issue 21 , 2016 , Pages 9698-9704 ; 19443994 (ISSN) Azadi Aghdam, M ; Kariminia, H. R ; Safari, S ; Sharif University of Technology
    Taylor and Francis Inc  2016
    Electrocoagulation is an effective, fast, and economic method for treatment of industrial wastewaters. In this study, effects of different parameters including electrolysis time, voltage, and pH on the reduction of chemical oxygen demand (COD), lignin, and color in pulp and paper wastewaters were studied. Iron and aluminum were used as anode and cathode electrodes, respectively. Under the optimal conditions (pH 5, 60 min, 10 V), this treatment method led to 85% removal of COD and 78.5% removal of lignin. Furthermore, clear treated water with complete color removal was generated that suggests the application of electrocoagulation for industrial wastewater treatment, especially in pulp and... 

    The effect of influent COD and upward flow velocity on the behaviour of sulphate-reducing bacteria

    , Article Process Biochemistry ; Volume 40, Issue 7 , 2005 , Pages 2305-2310 ; 13595113 (ISSN) Shayegan, J ; Ghavipanjeh, F ; Mirjafari, P ; Sharif University of Technology
    The effect of up velocity and influent COD concentration on the activity of sulphate-reducing bacteria (SRB) in UASB reactors is discussed. To study these effects, four UASB reactors were built and utilized in parallel. Examinations were carried out in two different concentrations of molasses (500 mg COD/l and 1000 mg COD/l) and four different upward flow velocities. It was observed that at velocities greater than 1 m/h, SRB bacteria were easily washed out from the reactors due to lower density and lack of ability to form dense and firm granules. It was found that in low-strength wastewaters with a COD to sulphate ratio of 2, an upward velocity in the range of 1.5-2.5 m/h could be... 

    Wastewater Treatment by Integrated MBBR-MBR and BF-MBR Methods to Increase Performance and Decrease Membrane Fouling

    , M.Sc. Thesis Sharif University of Technology Fathinejad, Alborz (Author) ; Vosoughi, Manoucherhr (Supervisor)
    The effect of the combination of MBR and MBBR systems to enhance the efficiency of water treatment plants has been studied. In this study, by embedding a UASB reactor in the presence of packing, as anoxic, two MBBR reactors as a single aerobic treatment and a MBR reactor once with and once without packing as the final purification tried to remove pollutants from artificial drainage and extend the life of the membrane system is designed to convey the wastewater treatment and irrigation is its quality standards functionality and the quality of its wastewater treatment standards for agricultural irrigation. Studied pollutants include COD, ammonia, nitrate, nitrite and phosphate. membrane... 

    Effect of metal oxide based TiO2 nanoparticles on anaerobic digestion process of lignocellulosic substrate

    , Article Energy ; Volume 191 , 2020 Ghofrani Isfahani, P ; Baniamerian, H ; Tsapekos, P ; Alvarado Morales, M ; Kasama, T ; Shahrokhi, M ; Vossoughi, M ; Angelidaki, I ; Sharif University of Technology
    Elsevier Ltd  2020
    Lignocellulosic materials are recalcitrant to bioconversion, due to their rigid physiochemical structure. In this work, the effects of Fe2O3–TiO2 and NiO–TiO2 nanoparticles (NPs) and FeCl3 and NiCl2 salts, on the anaerobic digestion (AD) of wheat straw have been investigated. For this purpose, metal oxide-TiO2 NPs were synthesized and fully characterized. Results showed that addition of 0.252 mg of NiO–TiO2/g total solids (TS) to batch assays resulted in increase of soluble chemical oxygen demand (COD) and 67% increase in volatile fatty acids (VFAs) concentration compared to control tests during the first 4 days of experiments. These results indicate that hydrolysis and acidogenesis rates... 

    An investigation on using MDCs for an efficient desalination process as pretreatment of reverse osmosis

    , Article Journal of Water Supply: Research and Technology - AQUA ; Volume 69, Issue 4 , 1 June , 2020 , Pages 322-331 Habibi, A ; Abbaspour, M ; Javid, A. H ; Hassani, A. H ; Sharif University of Technology
    IWA Publishing  2020
    Microbial desalination cell (MDC) is a new bio-electrochemical technique which converts chemical energy into electrical energy, and at the same time desalinates water and treats wastewater. In this study, MDC performance and water biofouling conditions were tested as an efficient pretreatment desalination process of reverse osmosis (RO). The experiments were designed in a three-chamber reactor to compare the performance of batch and continuous fed modes, using bio-cathode and synthetic wastewater in four different hydraulic retention times and 17 and 35 g/L NaCl concentrations. According to the results, maximum salt removal of about 52.3% was obtained in the continuously fed MDC at 35 g/L... 

    MBBR and MBR Reactor Configuration for Better Performance

    , M.Sc. Thesis Sharif University of Technology (Author) ; Borgheei, Mahdi (Supervisor)
    Membrane bioreactors (MBRs) which are commonly understood as the combination of membrane filtration and biological treatment using activated sludge have several advantages, but membrane fouling reduces the membrane efficiency, permeability and lifetime. An alternative is replacing a moving bed biofilm reactor (MBBR) with the activated sludge system which may reduce the effect of membrane fouling. The sludge produced in MBBRs has poor settling characteristics, therefore, their efficiency is limited by the sedimentation tank performance and they require a larger settling surface. The combination of moving bed biofilm reactors and membrane bioreactors can compensate for the drawbacks of both of... 

    Performance Evaluation of Membrane Bioreactors in Treating Municipal Wastewater

    , M.Sc. Thesis Sharif University of Technology Hatami Bahman Beyglou, Elnaz (Author) ; Torkian, Ayoub (Supervisor)
    Membrane bioreactors can replace the activated sludge process and the final clarification step in municipal wastewater treatment. The combination of bioreactor and crossflow microfiltration allows for a high chemical oxygen demand (COD) reduction of synthetic wastewater. In this study, experimental data from a laboratory scale membrane bioreactor are presented. In order to investigate the influence of various operating parameters such as hydraulic retention time (HRT), biomass concentration and organic loading rate on organic pollutant removal, the pilot scale submerged membrane bioreactor (SMBR) with a Polyvinylidene Fluoride (PVDF) hollow fiber membrane module was conducted using synthetic... 

    Optimisation of SBR Systems in Treating Mono-Ethylene –Glycol Wastewaters

    , M.Sc. Thesis Sharif University of Technology Esmaili Hashemabadi, Zahra (Author) ; Borghei, Mehdi (Supervisor)
    In the present study , operation of a laboratory scale sequencing batch reactor (SBR) was evaluated to treatment of synthetic wastewaters containing ethylene glycol. Studies carried out with a plexiglass bioreactor whith effective volume of 18 lit.Aeration was supplied via two air diffusers that set at the bottom of the reactor. Synthestic wastewater containing ethylene glycol and molasses as carbon source and other nutrient such as diammonium hydrogen phosphate as phosphor source and urea as nitrogen source for biological activities was composed at the laboratory. To optimization of this reactor three parameters – aeration time, chemical oxygen demand and sudden change in arganic loading... 

    , M.Sc. Thesis Sharif University of Technology Hassanjani, Sina (Author) ; Alemzadeh, Iran (Supervisor) ; Vosoughi, Manouchehr (Co-Advisor)
    Nowadays with the extension of industry and factories as well as different kinds of plants, a wide range of pollution and circumference hazardous has been entered to the people`s life. Industrial wastewater has been always a threat for health of our environment and efforts for reducing its dangerous effects are still under studies. Dairy wastewater is one of the main branches of food industrial pollutions and it has been studied in this specific project. The goal was to reduce the Chemical Oxygen Demands (COD) of dairy wastewater with oxidation of Titanium Dioxide Nanophotocatalyst oxidation under UV irradiation. Among the various methods for synthesizing of this Nanophotocatalyst, the... 

    Experimental Preparation of a Nanofibrous Membrane for Separation of Wastewater Contaminants

    , M.Sc. Thesis Sharif University of Technology Hosseini, Abolhassan (Author) ; Soltanieh, Mohammad (Supervisor) ; Mousavi, Mahmoud (Supervisor)
    In this project, cellulose acetate butyrate (CAB) nanofibrous membranes in order to separate the contaminants of an industrial wastewater were prepared. Electrospinning process that is an effective method to fabricate nanofibers was used to prepare the membranes. Since various parameters affect this process and fibers morphology, optimization of these parameters is necessary for preparation of improved membranes. So the effect of parameters of solvent system, polymer concentration, applied voltage, distance between the tip of needle and collector, and rotational speed of collector on morphology and diameter of the nanofibers was investigated. Scanning electron microscopy (SEM) and image...