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Treatment of wastewatercontaining carbohydrates usingpichia saitoi culture
, Article International Journal of Engineering, Transactions B: Applications ; Volume 17, Issue 3 , 2004 , Pages 209-218 ; 1728-144X (ISSN) ; Yaghmaei, S ; Maghsoodi, V ; Sharif University of Technology
National Research Center of Medical Sciences
2004
Abstract
Treatment of wastewater containing carbohydrates by Pichia saitoi growing on beet molasses was investigated in a well-mixed continuous tank as an alternative to bulking control. The yeast strain that used in this work was isolated from non-alcoholic beverage industrial wastewater, with a view on TOC removal compared with other strains in previous study.In this research the isolated yeast showed high COD and TOC removal at three hydraulic retention times, HRT= 48, 24 and 18 hours.Maximum COD and TOC reductions were obtained at HRT=48 hours, which were 96% and 88%, respectively.The influent COD and TOC were 2500 and 148 mg/1, respectively.The pH maintained for synthetic wastewater was about...
The effect of HRT and carriers on the sludge specifications in MBR to remove VOCs from petrochemical wastewater
, Article Desalination and Water Treatment ; Dec , 2015 , Pages 1-13 ; 19443994 (ISSN) ; Shayegan, J ; Mojtaba Seyedi, S ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
This work employs two membrane bioreactors (with and without carrier) to evaluate the influence of carrier and hydraulic retention time (HRT) on the sludge specifications when removing organic volatile compounds (e.g. styrene and ethylbenzene) from petrochemical wastewater. This study is conducted during three various HRTs. The results indicate that the optimum HRT (e.g. 15 h.) was achieved in the reactor with carrier during biological removal and membrane fouling minimization. During the optimum HRT, the biological removal efficiency for styrene, ethylbenzene, and COD is 99.8 ± 0.1%, 99.8 ± 0.1%, and 99 ± 0.8%, respectively, and the concentration of styrene and ethylbenzene in the exit air...
The effect of HRT and carriers on the sludge specifications in MBR to remove VOCs from petrochemical wastewater
, Article Desalination and Water Treatment ; Volume 57, Issue 46 , 2016 , Pages 21730-21742 ; 19443994 (ISSN) ; Shayegan, J ; Mojtaba Seyedi, S ; Sharif University of Technology
Taylor and Francis Inc
2016
Abstract
This work employs two membrane bioreactors (with and without carrier) to evaluate the influence of carrier and hydraulic retention time (HRT) on the sludge specifications when removing organic volatile compounds (e.g. styrene and ethylbenzene) from petrochemical wastewater. This study is conducted during three various HRTs. The results indicate that the optimum HRT (e.g. 15 h.) was achieved in the reactor with carrier during biological removal and membrane fouling minimization. During the optimum HRT, the biological removal efficiency for styrene, ethylbenzene, and COD is 99.8 ± 0.1%, 99.8 ± 0.1%, and 99 ± 0.8%, respectively, and the concentration of styrene and ethylbenzene in the exit air...
Fouling reduction in the membrane bioreactor using synthesized zeolite nano-adsorbents
, Article Journal of Membrane Science ; Volume 555 , 2018 , Pages 455-462 ; 03767388 (ISSN) ; Jahanbakhshi, N ; Rostamizadeh, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
In this work, we synthesized two types of zeolite nano-adsorbents termed HZ1 and HZ2. For further improving the effluent quality and reduction of membrane fouling, these two synthesized zeolite nano-adsorbents were used in a membrane bioreactor (MBR). Particle size distribution (PSD), soluble microbial products (SMP), and extracellular polymeric substance (EPS) for sludge were measured. In addition Fourier-transform infrared spectroscopy (FTIR), excitation-emission matrix (EEM) fluorescence spectroscopy, gel permission chromatography (GPC), and EPS analysis were performed for characterization the properties of the formed cake. The results showed that both HZ1 and HZ2 had better function in...
Biodegradation of effluents from dairy plant by bacterial isolates
, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 26, Issue 1 , 2007 , Pages 55-59 ; 10219986 (ISSN) ; Samadi, A ; Ghobadi, Z ; Sharif University of Technology
2007
Abstract
Micro flora of the effluents from a dairy factory in Tehran(Pegah Dairy Processing Plant) were isolated and screened for their ability to reduce the organic matter content and COD of the effluents. 10 bacteria were selected due to reduction in COD content from the 4th to 6th day of incubation at 30 °C and pH =11. Highest COD reduction were obtained by two isolates, BP3 and BP4, 70.7 % and 69.5 %, respectively (The initial COD concentration was 3000 mg/l and reduced to 880 and 920 mg/l).After optimization of the condition for test organisms, big reductions in COD, carbohydrate, fat and protein content of the effluents were observed by BP3 up to 84.70 %, 98 %, 45.30 % and 53 %, respectively...
Municipal wastewater treatment and fouling in microalgal-activated sludge membrane bioreactor: Cultivation in raw and treated wastewater
, Article Journal of Water Process Engineering ; Volume 49 , 2022 ; 22147144 (ISSN) ; Shamskilani, M ; Babaei, A ; Behrang, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Since the advent of conventional activated sludge biological treatment plants, their low efficiency in nitrogen and phosphorus removal has become a significant concern. Therefore, in this study, the performance of microalgal-activated sludge membrane bioreactor (MAS-MBR) as a self-biological treatment or as a post-treatment for conventional biological treatments was investigated. A continuous MAS-MBR with two ratios of algae/sludge (only microalgae and 5:1) was used to treat raw and treated wastewater. The optimum case was achieved with the cultivation of mixed algae/sludge in raw wastewater (R2 case). In this case, the ammonium and phosphorus removal efficiencies were 94.36 ± 3.5 and 88.37...
Continuous decolorization of anaerobically digested distillery wastewater
, Article Process Biochemistry ; Volume 40, Issue 3-4 , 2005 , Pages 1323-1329 ; 13595113 (ISSN) ; Pazouki, M ; Afshari, A ; Sharif University of Technology
2005
Abstract
The aim of this research work was to decolorize anaerobically digested (UASB) and aerobically treated distillery wastewater of a process for ethanol production. An Aspergillus species isolated from the soil was used for decolorization. A sequential Plackett-Burman design in three stages was used for optimization of decolorization conditions. Both maximum decolorization and COD reduction under optimized conditions were obtained as 84%. By implementing the optimum values in a pilot scale of an activated sludge system a continuous process for decolorization was conducted. The decolorization efficiency of this system with 48 h retention time was about 75% in a limited period of 4 days. For...
Optimization of ultrasonic waves application in municipal wastewater sludge treatment using response surface method
, Article Journal of Cleaner Production ; Volume 150 , 2017 , Pages 361-370 ; 09596526 (ISSN) ; Abedini, R ; Rajabi, R ; Sharif University of Technology
Abstract
Today, many limitations are faced in sludge treatment and disposal. Therefore evaluation of different approaches to reduce sludge production in the activated sludge process has attracted great attention. Application of ultrasonic waves in sludge treatment caused to reduce sludge volume and accelerate sludge digestion. This research intended to study the efficiency of ultrasound in dewatering biological sludge in wastewater treatment plants under different conditions. In this study, response surface method was used to investigate results and optimum conditions were determined. Sludge was treated in different conditions as follows: 330–920 W ultrasound power, 1.5–3.9 L sample volume and...
Upgrading activated sludge systems and reduction in excess sludge
, Article Bioresource Technology ; Volume 102, Issue 22 , November , 2011 , Pages 10327-10333 ; 09608524 (ISSN) ; Shayegan, J ; Sharif University of Technology
2011
Abstract
Most of 200 Activated Sludge Plant in Iran are overloaded and as a result, their efficiency is low. In this work, a pilot plant is manufactured and put into operation in one of the wastewater treatment plants in the west of Tehran. Instead of conventional activated sludge, a membrane bioreactor and an upflow anaerobic sludge blanket reactor used as a pretreatment unit in this pilot. For the sake of data accuracy and precision, an enriched municipal wastewater was opted as an influent to the pilot. Based on the attained result, the optimum retention time in this system was 4. h, and the overall COD removal efficiency was 98%. As a whole, the application of this retrofit would increase the...
Effect of the ozonation pretreatment on biogas production from waste activated sludge of tehran wastewater treatment plant
, Article Biomass and Bioenergy ; Volume 152 , 2021 ; 09619534 (ISSN) ; Ghasemi, S ; Khosravi, A ; Vossoughi, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
In this study, the ozonation impact on anaerobic digestion of wasted thickened activated sludge of Tehran wastewater treatment plant has been investigated. Regarding that, the thickened activated sludge, a final solid waste of treatment plants, was subjected to ozonation pretreatment to evaluate its characteristics. Three major sludge characteristics were considered for investigating ozonation effects on anaerobic digestion. A comparison of two different ozone doses, i.e., 0.05 and 0.1 gO3 g−1TS was performed for short-term (10 days) and long-term (30 days) sludge retention times. Furthermore, biogas production, sludge composition, dewaterability, and energy balancing, were studied during...
Anaerobic degradation of molasses stillage in a pilot UASB reactor
, Article Scientia Iranica ; Volume 12, Issue 3 , 2005 , Pages 255-261 ; 10263098 (ISSN) ; Torkian, A ; Hakimjavadi, M ; Azimi, E ; Sharif University of Technology
Sharif University of Technology
2005
Abstract
The feasibility of a mesophilic anaerobic treatment of an alcohol distillery wastewater (beet molasses stillage) was studied in a 1300 I Upflow Anaerobic Sludge Blanket (UASB) reactor for a period of 180 days. The system was seeded with 600 L of mesophilic anaerobic sludge harvested from the bottom of a dairy anaerobic lagoon. Nutrients were added to acidified effluent and after adjusting the pH in an equalization tank, the system was fed with a diluted effluent containing COD in the range of 1000-11000 mg/L at 30°C. Initially, the system had an OLR of 1 kg COD m-3 d-1 and upflow velocity was maintained at 0.6 m/h (HRT= 6 h) throughout the study. A gradual increase in OLR, through increased...
Biological Sludge Reduction in MBBR Process
, M.Sc. Thesis Sharif University of Technology ; Borghei, Mehdi (Supervisor) ; Moslehi Moslehabadi, Parivash (Supervisor)
Abstract
Laboratory experiments were carried out to investigate the effect of ultrasound waves on sludge reduction in MBBR bioreactor for industrial wastewater. The experiments were performed using two identical 20L MBBR bioreactor under same operational conditions. In MBBR with return sludge, sludge was collected from clarifier and after being sonicated, returned to the system by pump.
For determining optimum intensity and time duration of ultrasound, 0.3lit of MBBR sludge was sonicated with intensities of 20, 30, 60, 120, 150, 250 w/cm2 and time duration of 5, 10, 15, 20, 30 min. Afterward, these two parameters were optimized with Energy Efficiency Index. As the results shown, intensity of 120...
For determining optimum intensity and time duration of ultrasound, 0.3lit of MBBR sludge was sonicated with intensities of 20, 30, 60, 120, 150, 250 w/cm2 and time duration of 5, 10, 15, 20, 30 min. Afterward, these two parameters were optimized with Energy Efficiency Index. As the results shown, intensity of 120...
Optimization of Oily and Biological Sludge Digestion and Dewatering Process for Arak Refinery Wastewater Treatment Plant
, M.Sc. Thesis Sharif University of Technology ; Borghei, Mehdi (Supervisor)
Abstract
Different strategies for the treatment and disposal of petroleum and biological sludge found in the treatment and reuse unit of Arak Petroleum Refinery have been studied in the present study. To this end, the resources found in the literature corresponding to the different fields of sludge treatment were studied and a summary of them which was required by this research was mentioned in the thesis. Considering the problems bound to the wastewater treatment unit of this refinery plant and the previous studies, two completely separate strategies were devised. The first one concerns petroleum and biological sludge being produced continuously. The method of aerobic fixation of petroleum sludge by...
Municipal Wastewater Treatment Using Microalgal-Sludge System
, M.Sc. Thesis Sharif University of Technology ; Shaygan Salek, Jalaloddin (Supervisor) ; Mehrnia, Mohammad Reza (Supervisor)
Abstract
If wastewater is not properly treated, then the environment and human health can be negatively impacted. These impacts can include harm to fish and wildlife populations, oxygen depletion and contamination of drinking water. In the typical wastewater treatment process, the goal of primary, secondary and tertiary effluent treatment is to reduce or remove organic matter, solids, nutrients, disease-causing organisms and other pollutants from the treated wastewater before it is discharged to a body of water. Biological methods for wastewater treatment are much preferable for being more economical and environmentally friendly. Biological treatment of wastewater using algal-bacterial culture...
Application of Polymer and Nanoparticles to Improve the Properties of Bitumen Derived From Acidic Sludge
, M.Sc. Thesis Sharif University of Technology ; Ramazani Saadat Abadi, Ahmad (Supervisor) ; Shojaei, Akbar (Supervisor)
Abstract
Study of the recycling of acidic sludge waste produced from oil refineries and its application in road pavements is the one of the most important issues. Disposal of this sludge has always put the nature at risk. In this research, preliminary NPS bitumen was derived through neutralization and processes. NPS was modified by some thermoplastic elastomers such as SEBS, SBS, EVA, … and SBR and NBR rubbers. Also as a ionic and surface modified organoclay, C15A was used in three different weight percent. Rheological and performance behavior of pure bitumen and modified ones was studied using of standard tests for simulating traffic load. Behavior evaluation tests was included dynamic frequency...
Biodegradation of phenol from a synthetic aqueous system using acclimatized activated sludge
, Article Arabian Journal of Geosciences ; Volume 6, Issue 10 , 2013 , Pages 3847-3852 ; 18667511 (ISSN) ; Doulati Ardejani, F ; Marandi, R ; Rafiee pur, S ; Sharif University of Technology
2013
Abstract
Phenol is one of the aromatic hydrocarbons. Phenol and its derivatives are highly toxic. These pollutants can be observed in the effluents of many industries. This research investigates the removal of phenol by the use of activated sludge in a batch system. The effects of influencing factors on biodegradation efficiency have been evaluated. The main factors considered in this study were the volume of acclimatized activated sludge inoculation, pH, temperature, and initial concentration of phenol. The inoculation volumes of 1, 3, and 5 mL of acclimatized activated sludge were taken into account. Different pH values of 3, 5, 7, 9, and 11 were examined. The experiments were conducted for...
Rapid start-up and improvement of granulation in SBR
, Article Journal of Environmental Health Science and Engineering ; Volume 13, Issue 1 , 2015 ; 2052336X (ISSN) ; Shayegan, J ; Rezasoltani, S ; Sharif University of Technology
BioMed Central Ltd
2015
Abstract
Abstract Background: The aim of this study is to accelerate and improve aerobic granulation within a Sequencing Batch Reactor (SBR) by cationic polymer addition. Methods: To identify whether the polymer additive is capable of enhancing granule formation, two SBRs (R1 and R2, each 0.15 m in diameter and 2 m in height) are used by feeding synthetic wastewater. The cationic polymer with concentration of 30 to 2 ppm is added to R2, while no cationic polymer is added to R1. Results: Results show that the cationic polymer addition causes faster granule formation and consequently shorter reactor start-up period. The polymer-amended reactor contains higher concentration of biomass with better...
Fate of intermediate biodegradation products of triethyl amine in a compost-based biofiltration system
, Article International Journal of Environmental Research ; Volume 1, Issue 2 , 2007 , Pages 163-169 ; 17356865 (ISSN) ; Keshavarzi Shirazi, H ; Mehrdadi, N ; Sharif University of Technology
2007
Abstract
Biofiltration of Triethylamine (TEA) vapor used as a catalyst in casting operations was evaluated in this study The unit consisted of a 6-L three-stage biofilter containing a mixture of compost and wood chips (40:60 v/v) as the filter medium. Seed microbial population from municipal activated sludge was acclimated for a period of three weeks prior to the actual experimental runs. In the startup period, high pH values up to 10 was observed due to alkaline nature of TEA and inadequate formation of biofilm and low overall biodegradation. Steady increase of organic-N concentration along with gradual upward trend of pressure drop indicated sound establishment of microbial population. Operational...
Sulfide removal by natural mix of chemotrophic sulfide oxidizing bacteria in anaerobic conditions
, Article CHISA 2006 - 17th International Congress of Chemical and Process Engineering, Prague, 27 August 2006 through 31 August 2006 ; 2006 ; 8086059456 (ISBN); 9788086059457 (ISBN) ; Vossoughi, M ; Soltanieh, M ; Rizi, Z. T ; Sharif University of Technology
2006
Abstract
Most sulfide oxidizing bioreactors are based on pure cultures or artificial mixes of microorganisms with strict requirements for growth, which make the system unstable and do not guarantee their long term performance. The ultimate goal of this study is to develop a natural mix of chemotrophic bacteria that may be applied anaerobically for the treatment of sour gas. Activated sludge from local municipal wastewater treatment plant that was maintained in endogenous anaerobic conditions for one year was used in this study. Total suspended solids (TSS) and volatile suspended solids (VSS) of the sludge was 22 gl-1 and 14.3 gl-1, respectively. A glass culture vessel had a volume of 0.65 L was used...
Efficiency studies of modified IFAS-OSA system upgraded by an anoxic sludge holding tank
, Article Scientific Reports ; Volume 11, Issue 1 , 2021 ; 20452322 (ISSN) ; Takdastan, A ; Borghei, S. M ; Kiasat, N ; Glodniok, M ; Zawartka, P ; Sharif University of Technology
Nature Research
2021
Abstract
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...