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Open AccessArticle

The Use of Chemical Methods and Magnetic Field in Conditioning and Dewatering of Digested Sewage Sludge

Department of Infrastructure and Environment, Czestochowa University of Technology, Dabrowskiego 69, 42-200 Czestochowa, Poland
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Water 2020, 12(6), 1642; https://doi.org/10.3390/w12061642
Received: 29 April 2020 / Revised: 2 June 2020 / Accepted: 3 June 2020 / Published: 8 June 2020
(This article belongs to the Special Issue Circle Sustainability of Wastewater and Sludge Treatment)
This study verified the possibility of sludge conditioning before dewatering using a combination of factors such as iron coagulant, polyelectrolyte, and the magnetic field generated by a solenoid. It was assumed that further conditioning with the magnetic field, leads to the formation of a rigid structure of sludge flocs by the destabilized and flocculated solid phase particles in the sludge (using the conditioning dual chemical method: PIX—polyelectrolyte). The resulting structure can increase the efficiency of sludge cake filtration by reducing sludge compressibility and maintaining the porosity necessary for the flow of removed water through the filter cake. The effects of the exposure of conditioned sludge (after the dual chemical method) to the magnetic field depended on two factors. The first factor was the direction of sludge flow through the magnetic field. This was a key factor in improving the efficiency of sludge conditioning using this method. The sludge flow through the solenoid in the direction opposite to the magnetic field had a strong effect on the particles. The second factor was the rate of sludge flow through the magnetic field. Better results were obtained for a flow rate of 1.0 L/min than for pumping sludge through a coil at a rate of 2.0 L/min. At a flow rate of 1.0 L/min, the exposure time of the sludge to the magnetic field was 6.6 s. Too high a flow rate may lead to the deterioration of filtration efficiency by adverse changes in the structure of sludge flocs. This may be due to the mechanical destruction of the flocs structure of sludge by a too turbulent flow. View Full-Text
Keywords: digested sludge; conditioning; polyelectrolyte; ferric coagulant; magnetic field; dewatering digested sludge; conditioning; polyelectrolyte; ferric coagulant; magnetic field; dewatering
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MDPI and ACS Style

Kamizela, T.; Kowalczyk, M.; Zawieja, I. The Use of Chemical Methods and Magnetic Field in Conditioning and Dewatering of Digested Sewage Sludge. Water 2020, 12, 1642. https://doi.org/10.3390/w12061642

AMA Style

Kamizela T, Kowalczyk M, Zawieja I. The Use of Chemical Methods and Magnetic Field in Conditioning and Dewatering of Digested Sewage Sludge. Water. 2020; 12(6):1642. https://doi.org/10.3390/w12061642

Chicago/Turabian Style

Kamizela, Tomasz; Kowalczyk, Mariusz; Zawieja, Iwona. 2020. "The Use of Chemical Methods and Magnetic Field in Conditioning and Dewatering of Digested Sewage Sludge" Water 12, no. 6: 1642. https://doi.org/10.3390/w12061642

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