Next Article in Journal
Comparison of Diesel Engine Vibroacoustic Properties Powered by Bio and Standard Fuel
Next Article in Special Issue
Thermal Analysis and Optimization of the Phase Diagram of the Cu-Ag Sulfide System
Previous Article in Journal
Analysis of the Head of a Simulation Crash Test Dummy with Speed Motion
Previous Article in Special Issue
The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System
 
 
Article

Pyrolysis of Municipal Sewage Sludge to Investigate Char and Phosphorous Yield together with Heavy-Metal Removal—Experimental and by Thermodynamic Calculations

Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Fiseha Tesfaye
Energies 2021, 14(5), 1477; https://doi.org/10.3390/en14051477
Received: 5 February 2021 / Revised: 1 March 2021 / Accepted: 2 March 2021 / Published: 8 March 2021
Sewage sludge is regarded as a potential source for soil fertilizer However, the direct utilization of sewage sludge in agricultural land is restricted since it also contains heavy metals, pathogens, and toxic compounds. Pyrolysis of the sewage sludge destroys the organic pollutants and partly volatilizes the heavy metals. In this study, pyrolysis of sewage sludge was carried out in order to determine the optimum residence time and temperature to recover the phosphorous and remove heavy metals from the resultant sewage sludge char (SSC). Pyrolysis was conducted on dried sewage sludge (DSS) by means of thermogravimetric analysis (TGA) and high-temperature oven with an N2-atmosphere. Microwave Plasma-Atomic Emission Spectroscopy (MP-AES) was used to determine the concentration of P and trace elements in the resulting solid char fraction. A combination of chemical fractionation (step-by-step leaching) of the DSS and thermodynamic equilibrium calculations were utilized to estimate the availability of phosphorous and removal of heavy metals in the SSC fraction at different temperatures. The results from the thermodynamics calculation were in line with the measured chemical composition of the SSC. Furthermore, the energy contents of the SSC obtained at different temperatures were measured. The pyrolysis evaluation results indicate that phosphorous was enriched in the char, while lead, zinc, and cadmium were significantly removed. View Full-Text
Keywords: sewage sludge; pyrolysis; thermodynamic equilibrium modeling; phosphorus recovery; chemical fractionation sewage sludge; pyrolysis; thermodynamic equilibrium modeling; phosphorus recovery; chemical fractionation
Show Figures

Graphical abstract

MDPI and ACS Style

Vali, N.; Åmand, L.-E.; Combres, A.; Richards, T.; Pettersson, A. Pyrolysis of Municipal Sewage Sludge to Investigate Char and Phosphorous Yield together with Heavy-Metal Removal—Experimental and by Thermodynamic Calculations. Energies 2021, 14, 1477. https://doi.org/10.3390/en14051477

AMA Style

Vali N, Åmand L-E, Combres A, Richards T, Pettersson A. Pyrolysis of Municipal Sewage Sludge to Investigate Char and Phosphorous Yield together with Heavy-Metal Removal—Experimental and by Thermodynamic Calculations. Energies. 2021; 14(5):1477. https://doi.org/10.3390/en14051477

Chicago/Turabian Style

Vali, Naeimeh, Lars-Erik Åmand, Aurélie Combres, Tobias Richards, and Anita Pettersson. 2021. "Pyrolysis of Municipal Sewage Sludge to Investigate Char and Phosphorous Yield together with Heavy-Metal Removal—Experimental and by Thermodynamic Calculations" Energies 14, no. 5: 1477. https://doi.org/10.3390/en14051477

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop