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DOI: https://doi.org/10.4491/eer.2019.061
Evaluation of the performance of encapsulated lifting system composting technology with a GORE(R) cover membrane: Physico-chemical properties and spectroscopic analysis
Mutaz Al-Alawi1, Loubna El Fels2, Ramadan Benjreid1, Tamas Szegi1, Mohamed Hafidi2, Barbara Simon1, and Miklos Gulyas1
1Department of Soil Science and Agricultural Chemistry, Institute of Environmental Science, Faculty of Agriculture and Environmental Sciences, Szent Istvan University, H-2100 Godollo, Pater Karoly utca 1, Hungary
2Laboratory of Ecology and Environment (L2E) (Unit Associated with the CNRST, URAC32), Faculty of Science Semlalia, Cadi Ayyad University, BP: 2390, Marrakesh, Morocco
Corresponding Author: Mutaz Al-Alawi ,Tel: +36-702833067, Fax: +36-28410804, Email: alawi1979@yahoo.com
Received: February 14, 2019;  Accepted: April 29, 2019.
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ABSTRACT
Composting is among the most effective integrated waste management strategies used to recycle sewage sludge (SS) waste and generate a useful product. An encapsulated lifting system (ELS) is a relatively new industrial-scale composting technology. The objective of this study was to evaluate the effectiveness of composting dewatered stabilized SS mixed with green waste using this new technology. The composting process was monitored by changes in the physico-chemical properties, UV-visible spectra, and fourier transform infrared (FTIR) spectra. The composting temperature was steady in the thermophilic range for 24 and 12 d in the intensive and maturation phases, respectively, which fulfilled the disinfection requirement. Moreover, the temperature increased rapidly to 76.8°C within three days, and the thermophilic temperatures peaked twice and lasted longer than in traditional composting, which accelerated SS degradation and decreased the composting period necessary to obtain mature compost. FTIR spectroscopic analysis showed a diminished in methyl group derived from methane (CH4) and methylene C-H aliphatic groups because of organic matter degradation by microorganisms and an increased number of aromatic chains. The new technology may be a viable and sustainable alternative for SS management that converts waste into compost that is useful as a soil amendment.
Keywords: Encapsulated lifting system (ELS) composting | GORE(R) cover membrane | Physico-chemical properties | Sewage sludge | Spectroscopic analysis | Two-stage composting
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