Comparison of five organic wastes regarding their behaviour during composting: Part 1, biodegradability, stabilization kinetics and temperature rise

Abstract

This paper aims to compare household waste, separated pig solids, food waste, pig slaughterhouse sludge 2 and green algae regarding their biodegradability, their stabilization kinetics and their temperature rise during 3 composting. Three experiments in lab-scale pilots (300L) were performed for each waste, each one under a 4 constant aeration rate. The aeration rates applied were comprised between 100 and 1100 L/h. The 5 biodegradability of waste was expressed as function of dry matter, organic matter, total carbon and chemical 6 oxygen demand removed, on one hand, and of total oxygen consumption and carbon dioxide production on the 7 other. These different variables were found closely correlated. Time required for stabilization of each waste was 8 determined too. A method to calculate the duration of stabilization in case of limiting oxygen supply was 9proposed. Carbon and chemical oxygen demand mass balances were established and gaseous emissions as 10 carbon dioxide and methane were given. Finally, the temperature rise was shown to be proportional to the total 11 mass of material biodegraded during composting. 12 13

Co-composting of livestock manure with rice straw: Characterization and establishment of maturity evaluation system

“…The temperature drop between peaks may be attributable to the large amount of heat loss caused by manually mixing, and some time interval was needed for heat accumulation to reach the subsequent peak. This observation is to some extent in agreement with the reports by de Guardia et al (2010a), Lee et al (2002), and Himanen and…”

“…Composting is a biological process in which organic matter (OM) can be utilized by aerobic thermophilic and mesophilic microorganisms as substrate and mainly converted into mineralized products (CO 2 , H 2 O, NH 4 + ) or stabilized OM (mostly as humic substances) (Bernal et al, 2009;He et al, 2009;de Guardia et al, 2010a;de Guardia et al, 2010b). Although composting has been widely practiced with its final products being used as fertilizer or soil amendment, there are still knowledge gaps in understanding it due to the high variety and heterogeneity of feedstocks (Li et al, 2008;Himanen and Hänninen, 2011).…”

Sequential Remediation Processes for Effective Removal of Oil from Contaminated Soils

“…Hua et al (2008) reported a steadily decreasing trend of moisture content from an initial value of 62.5% to a final value of 30.2% after 60 days during the composting of sewage sludge mixed with rapeseed marc. Guardia et al (2010) observed a decrease in the moisture content of composted food waste with wood chips the mixture from 63.4-50.5% after 37 days of composting. Ghaly et al (2007) reported a small reduction in the moisture content (from 60-59.47%) during the bioremediation of toluene contaminated soil.…”

Augmenting Composting Microbial Community with Thermophilic Cellulolytic Organisms for Enhanced Degradation of Phenolic Compounds in Creosote Treated Wood Waste

“…Guardia et al [26] composted food waste with wood chips and observed a decrease in the moisture content of the mixture from 63.4% to 50.5% after 37 days of composting. Ghaly et al [27] reported a reduction in moisture content from 60% to 43% after 15 days of composting creosote treated wood waste.…”