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The combined UASB and MBR system to COD and TSS removal and excess sludge reduction for the treatment of high strength wastewater in various operational temperatures
, Article Desalination and Water Treatment ; Volume 53, Issue 2 , 2015 , Pages 352-359 ; 19443994 (ISSN) ; Shayegan, J ; Mirbagheri, S. A ; Farajzadehha, S ; Hazrati, H ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
There are many activated sludge plants (ASP) in Iran. Most of them are overloaded and as a result their efficiency is very low. A combined laboratory-scale system (5 L reactors) consisting of an up-flow anaerobic sludge blanket (UASB) and aerobic membrane bioreactor (MBR) was operated at 20 and 30°C with pH between 7.6 and 8.4. The experiment was run to optimize treatment of high-strength enriched municipal wastewater of the Ekbatan treatment plant located in west Tehran. The chemical oxygen demand (COD) of the wastewater was enriched due to the addition of molasses and milk powder. To prevent pH fluctuation of the influent, NaHCO3 and K2HPO4 were added to the wastewater. The excess sludge...
Anaerobic treatment by UASB reactor and aerobic biodegradability test of cutting oil sewage
, Article Journal of Environmental Studies ; Vol. 40, issue. 1 , 2014 , p. 211-220 ; Sajadi, A. A ; Mirzaei, M ; Hoseynian, H ; Sharif University of Technology
Abstract
Introduction: Water is consumed in almost all industries. Consequently the used water is turning to a waste that usually should be treated to meet the regulated standard level prior to reuse or discharge into the environment. Cutting oil wastewater is an emulsion normally comprised ofl-10% oil and the remainder water. The main functions of this oil in industry are lubrication, friction reduction, and cooling of instrument s parts. This wastewater is classified as a toxic waste according to the existence of some additive material to prevent corrosion and bacterial growth. Breakage of the emulsion and separation of the water and the oil can alone reduce more than about 90% of the aqueous phase...
Effect of up flow velocity and temperature on the performance of UASB system treating slaughtery effluent
, Article World Water and Environmental Resources Congress 2001, Orlando, FL, 20 May 2001 through 24 May 2001 ; Volume 111 , 2004 ; 0784405697 (ISBN); 9780784405697 (ISBN) ; Hashemian, S. J ; Eqbali, A ; Sharif University of Technology
2004
Abstract
Temperature and up flow velocity are regarded as the two main parameters significantly affecting microbial ecology and characteristics of UASB systems. The 2.3 m high and 0.25 m2-cross-section UASB pilot used in this study received slaughtery effluent with SCOD in the range of 2000-5000 mg/L. Temperature was varied in the 28-35 °C mesophilic range using an in-line heat exchanger and three up flow velocities studied were 0.3, 0.57, and 1 m/h without any recycling. At least one-week adjustment time was allowed after any change in the conditions. Since granules had been formed previously, the start-up phase lasted for only two weeks and up flow velocity and temperature was maintained at 0.3 m/h...
Operation of Cane Refinery for MDF Wastewater in Vacation Season
, M.Sc. Thesis Sharif University of Technology ; Hashemian, Jamalodin (Supervisor) ; Mousavi, Reza (Supervisor)
Abstract
The purpose of this study was evaluation of the performance of wastewater treatment system of Imam Cane plant for treatment of MDF factory wastewater. At first, It was required that microorganisms acclimation with presence of indigestion components in MDF factory wastewater, therefor the planned flow of wastewater was added to the lagoon after enhancing of system efficiency and concentration of UASB reactor sludge. The flow of MDF factory wastewater was mixed with canefactory wastewater stream and then mixed flow was introduced to UASB reactor. At first, 82 m3/day of wastewater was introduced to lagoon and after 28 day efficiency of treatment system reached to 68.9%...
Optimizing OLR and HRT in a UASB reactor for pretreating high- Strength municipal wastewater
, Article Chemical Engineering Transactions ; Volume 24 , 2011 , Pages 1285-1290 ; 19749791 (ISSN) ; Shayegan, J ; Sharif University of Technology
Abstract
This study was carried out for examination of a lab-scale UASB reactor for optimization of organic loading rate and hydraulic retention time. The total volume of the reactor was 5 1 with an effective height of 160 cm and diameter of 5 cm. This reactor was used to treat fortified municipal wastewater at volumetric organic loadings of 3.6, 7.2, 10.8, and 14.4 kg m3 d 1 at temperature 30°C. The result of present work indicated an optimum range for organic loading (7.2 to 10.8 kg m-3 d-1) with COD removal efficiency of about 85%. Moreover, optimum HRT for influent COD concentration of 1200mg/l is shown to be only 4 hours. Furthermore nitrate removal efficiency was about 80% at optimized organic...
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...
Performance of Activated Sludge System at Different Weather and Solution for Upgrading
,
M.Sc. Thesis
Sharif University of Technology
;
Shaygan Salek, Jalaloddin
(Supervisor)
Abstract
Over 90 percent of the wastewater treatment systems use activated sludge which, yields to increase in organic loadings, these systems do not have appropriate performance. For upgrading of these systems a UASB reactor has been used prior to the activated sludge system, to improve the system performance and also reduce the excess sludge production. A membrane was also used instead of the sedimentation tank, to betterment the effluent quality. COD influent concentration was about 600 to 2400 mg/l, up to 98 percent of COD reduction obtain in this system. Also excess sludge reduction was over 90%. Such a system upgrading will increase treatment capacity by factor of 5. As it was shown, for UASBR,...
Management Treatment of MDF Effluent by Soil Aquifer Treatment (SAT)
, M.Sc. Thesis Sharif University of Technology ; Oskoee, Mohammad Mahdi (Supervisor) ; Jamali, Sirous (Co-Advisor)
Abstract
This study deals with the treatment of medium density fiberboard (MDF) effluent aiming at the removal of TSS, COD, BOD and Turbidity by means of soil aquifer treatment (SAT). Removal of parameters were evaluated during transport of MDF effluent under unsaturated flow conditions in 1-m soil (sandy-clay soil) depth. The experimental results showed that the new process with SAT to be very effective. The TSS, COD, BOD and turbidity removal average was about 99%, 30%, 89 and 98.5% at the optimum operation condition, respectively. The SAT should be added before the UASB in order to achieve high removal rate of COD and BOD. The UASB (concentration sludge 40000 mg/l) after SAT treatment MDF...