Volume 8, Number 1 (8-2015)                   ijhe 2015, 8(1): 23-30 | Back to browse issues page


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Heidari A, Nabizadeh R, Alimohammadi M, Gholami M, Mahvi A. Evaluation of changes in extracellular polymeric substances quantity within sludge dewatering using continues ultrasonic–electrocoagulation reactor. ijhe. 2015; 8 (1) :23-30
URL: http://ijhe.tums.ac.ir/article-1-5130-en.html

1- Center for Water Quality Research, Institute for Environmental Research, Tehran University of Medical Sciences; MSc of Environmental Health Engineering, School of public Health, Tehran University of Medical Sciences, Tehran, Iran
2- Department of Environmental Health Engineering, School of public Health, Tehran University of Medical Sciences; Center of Air Pollution Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
3- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
4- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
5- Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences; Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , ahmahvi@yahoo.com
Abstract:   (2276 Views)

Background and Objectives: Reduction of released extracellular polymeric substances (EPS) during sludge dewatering is one of the main challenges in sludge treatment process. The aim of this study was to investigate the EPS quantity changes within sludge dewatering by continues ultrasonic – electrocoagulation (US – EC) reactor under different conditions and to determine the most efficient case for reducing these substances. Materials and Methods: In this study, the EPS quantity changes in supernatant were compared after undergoing different conditions of ultrasonic (frequency of 35 and 130 KHz, detention time of 3,5,10, and 30 min) and electrocoagulation (voltage of 20, 30, and 40 V, detention time of 10, 20, and 30 min) processes were compared. Results: The research found that the maximum efficiency of the US-EC reactor was achieved at a frequency of 35 KHz and detention time of 5 min for ultrasonic with voltage of 40 V and at detention time of 30 min for electrocoagulation process as under these conditions total EPS concentration reduced by 69%. Conclusion: According to the results achieved, US – EC reactor significantly reduced the released EPS in supernatant in addition to dewatering sludge.

Full-Text [PDF 507 kb]   (1016 Downloads)    
Type of Study: Research | Subject: wastewater
Received: 2013/12/27 | Accepted: 2015/07/26 | Published: 2015/07/26

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