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Evaluation of Stability and Maturity Parameters in Wastewater Sludge Composting With Different Aeration Strategies and a Mixture of Green Plant Wastes As Bulking Agent



Nafez AH1 ; Nikaeen M1 ; Bina B2 ; Hassanzadeh A3 ; Moghim S4
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
  2. 2. Department of Environmental Health Engineering and Environment Research Center, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. School of Health, Isfahan University of Medical Sciences, Iran department of Statistic and Epidemiology, Isfahan, Iran
  4. 4. Department of Medical Microbiology and Virology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Fresenius Environmental Bulletin Published:2015

Abstract

The aim of this study was to investigate the influence of bulking agent volumetric ratio on the stability and maturity parameters in composting process of anaerobically digested sludge (ADS) with different aeration strategies. Two main influencing factors including aeration method (aerated static pile and windrow process) and proportion of green plant wastes (GPW) and ADS (1:1,2:1 and3:l, GPW: ADS) were investigated through the evaluation of physico- chemical and biological parameters during the 83 days of composting. Heavy metals concentration, germination index (GI), and microbiological indicators were also determined in the final products. The results showed that windrow method was superior to the aerated static piles, since the former enhances the composting process by favoring organic matter (OM) stabilization. Based on these results it appears that windrow method with 2:1 mixture of GPW: ADS was best for ADS composting due to the highest OM degradation ability and maximum GI in the final product.
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