Initial air pressure influence on in-vessel composting for the biodegradable fraction of municipal solid waste in Morocco

Abstract

This study aimed to determine the initial air pressure influence on the in-vessel composting for the biodegradable fraction of municipal solid waste in Morocco. For this purpose, representative composting mixture was prepared in which C/N ratio was 26 and moisture content was 70 %. The in-vessel bioreactor was designed and used specially to evaluate the initial air pressure effect on composting process in this study. Thus, daily changes of internal air pressure and temperature were monitored, and physicochemical properties of different composts obtained were also analyzed and compared. Experimental results showed a significant increase in internal pressure corresponding to the initial air pressure of 0.6 bar and a slight increase for the other initial air pressures. The initial air pressure which equal to 0.6 bar allowed maximum value of temperature and final composting product with good physicochemical properties as well as higher organic matter degradation and higher gas production. Composts obtained from experiments under 0.4 and 0.8 bar showed good maturity levels and may also be used for agricultural applications.

A potential bioconversion of empty fruit bunches into organic fertilizer using Eudrilus eugeniae

“…Generally, the composting process is applied to decompose and stabilize organic solid wastes, including yard wastes, agricultural crops, food wastes, manure, municipal solid wastes, sewage and industrial sludge (Khamforoush et al 2013). Composting period of organic matters may vary from 10 days to 3 months (and sometimes more), depending on the characteristics of the solid wastes (Makan et al 2014). The latest research found that composting of empty fruit bunches together with palm oil mill effluent and compatible multi-enzymatic fungal system produced matured compost with C/N ratio of 17 (Mohammad et al 2013).…”

Quality evaluation and improvement of mechanically–biologically treated municipal solid waste in view of a possible recovery

“…Furthermore, in the organic matter rich matrices, as in the case of biowaste, the role of solid organic matter and dissolved organic matter (DOC) is a key factor in the transfer of inorganic contaminants to the water phase through the formation of soluble and insoluble complexes (van der Sloot et al 2004;van Praagh et al 2009;Karak et al 2013). Since the pH of UBW, SBW I and SBW IV eluates was found to be around neutral values (Table 5) and did not significantly vary (as also observed by Makan et al 2014), the release of metals was minimally influenced by this parameter (Whittle and Dyson 2002); therefore, DOC was likely the most dominant factor controlling it (van der Sloot et al 2004). In order to evaluate how release of contaminants changed during the aerobic biodegradation process, the heavy metals and organic carbon (OC) percentage release was calculated by means of Eq.…”

Technical Feasibility of Hermetia illucens in Integrated Waste Management, Renovated with Sewage Water, an Overview

“…Apparently higher moisture content at the initial phase of the aerobic composting often found to be obligatory to achieve greater temperatures (>80˚C) and sustain it for the longer period. Based on a wide range of studies conducted by several researchers the initial moisture content of 75% associated with an air pressure value of 0.6 bar is highly recommended for optimum digestion of organic waste [46] [47]. If the system is cautiously operated associated environmental risk factors (emission of obnoxious gas, leachate formation etc.)…”