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Effect of sludge recirculation on sewage sludge anaerobic digester performance
Faculty
Engineering
Year:
2019
Type of Publication:
ZU Hosted
Pages:
Authors:
Ayman Mahmoud Ali Mhmmud
Staff Zu Site
Abstract In Staff Site
Journal:
International Journal of Current Engineering and Technology International Journal of Current Engineering and Technology
Volume:
9
Keywords :
Effect , sludge recirculation , sewage sludge anaerobic
Abstract:
Anaerobic digestion is an effective process for sewage sludge reduction. The production of sludge is increasing worldwide and anaerobic digestion presents limitations in terms of solid destruction and long sludge retention time. This study investigates the possibility of reducing the sludge retention time via increasing the Solid Retention Time (SRT). The effect of sludge recirculation rate on digester performance operated at 20 day Hydraulic Retention Time (HRT) was evaluated. Three different SRTs (20, 35, and 48 days) were evaluated. The experimental set up consists of three similar pilot scale mesophilic (37OC) anaerobic digesters with a capacity of 0.24 m3. The digesters were fed with thickened sludge (mixed primary and trickling filter humus) once daily. Also the effect of sludge recirculation at different HRTs was evaluated. The experimental results showed that for reactors operated at 20 day HRT; the chemical oxygen demand (COD) mass balance indicated; removal ratio increased from 43% to 60% as the SRT increased from 20 to 48 days. Also the methane generation increased as SRT increased. At lower HRTs the digester performance was decreased for all different SRTs. Results also showed that at high SRT the digester could be operated with higher loading rates (more than double) without affecting the efficiency. Finally the process showed stability for all operating conditions. Sludge recirculation is an easy, simple and reliable method for increasing anaerobic digester performance.
Author Related Publications
Ayman Mahmoud Ali Mhmmud, "Comparison between two Stages Up-flow Anaerobic Sludge Blanket and Activated Sludge Configuration for Municipal Sewage Treatment", International Journal of Scientific & Engineering Research, 2019
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Ayman Mahmoud Ali Mhmmud, "Review of beneficial uses of cement kiln dust (CKD), fly ash (FA) and their mixture", Journal of Materials and Environmental Sciences, 2019
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Ayman Mahmoud Ali Mhmmud, "Domestic Wastewater Treatment: A Comparison between an Integrated Hybrid UASB-IFAS System and a Conventional UASB-AS System", sustainability, 2021
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Ayman Mahmoud Ali Mhmmud, "Wastewater Treatment in Up-flow Anaerobic Packed Filter", Civil Engineering Research Magazine (CERM), 2015
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Ayman Mahmoud Ali Mhmmud, "Start Up Performance of Mesophilic Anaerobic Digester Without External Inoculums", Environment Protection Engineering, 2017
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Department Related Publications
Mahmoud Mohamed Mohamed Abdeldaiem, "Adsorption/bioadsorption of phthalic acid, an organic micropollutant present in landfill leachates, on activated carbons", www.elsevier.com, 2011
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Mahmoud Mohamed Mohamed Abdeldaiem, "Comparative study of the photodegradation of bisphenol A by HO , SO4 − and CO3 −/HCO3 radicals in aqueous phase", Elsevier, 2013
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Amro Abdelaziz Abdelrahman albazz, "Effect of Pressure, Water Depth and Water Flow Rate on Oxygen Saturation Level in Activated Sludge Process", Science Publications, 2011
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Amro Abdelaziz Abdelrahman albazz, "INCREASE OF SELF-PURIFICATION EFFICIENCY OF WATER STREAMS USING ROTATING BIOLOGICAL CONTACTORS (RBC)", The Egyptian Int. J. of Eng. Sci. And Technology, 2009
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Noha Saied Alhady , "reduction of ash sintering precursor components in rice straw by water washing", international journal, 2014
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