Volume 21, Issue 4 (Scientific Journal of Hamadan University of Medical Sciences-Winter 2015)                   Avicenna J Clin Med 2015, 21(4): 341-349 | Back to browse issues page

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Godini K, Masoumi Z, Baghi A, Atafar Z, Azarian G. Investigation of Activated Sludge Sewage Dewatering by Electro-Flotation: Optimization of Operating Parameters and Energy Consumption. Avicenna J Clin Med 2015; 21 (4) :341-349
URL: http://sjh.umsha.ac.ir/article-1-72-en.html
1- , g.azarian@umsha.ac.ir
Abstract:   (4186 Views)

Introduction & Objective: Common methods for dewatering of wastewater sludge need chemi-cals and high energy consumption and have low efficiency and environmental acceptability because of colloidal and jelly property of bacteria cells of sludge. Furthermore, their operat-ing is completely complicated. In this study electro-flotation way, as a novel method, was performed to cover these limitations and also operating parameters and energy consumptions were optimized.

Materials & Methods: In order to carry out the experiments, a batch reactor with the effective volume of 450 ml was used. In this experimental- laboratorial study, the effect of pH, current density, hydraulic retention time and surface/volume changes on the amount of dewatering and the amount of total solids in both the sludge cake (dewatered sludge) and the water sepa-rated from the sludge as well as the content of TSS, TS and COD in the water were investi-gated. The amount of consumed electricity was calculated and lowered by optimizing the variables.

 Results: The finding showed that the best efficiency (81.6%) of sludge dewatering was achieved at pH = 2, current density = 1.7mA/cm2, hydraulic retention time = 30 min and sur-face/volume amount = 178 cm2/L with electrical energy consumption of 0.33-0.726 kWh/m3.

Conclusion: The electro-flotation process owing to high efficiency, convenient construction and operating and lower energy consumption and construction costs compared to common methods can effectively be applied.

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Type of Study: Original | Subject: Other Clinical Specialties

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