Composting of separated animal slurry solid fraction: Effect of bulking Agent type and mixing-ratio on gaseous emissions
There is increased interest in composting separated animal slurry solid fractions as a potential strategy to improvemanure management and recycling. Composting, however, may result in greenhouse gas (GHG) emissions. The aim ofthe present study was to study the effect of solid fraction bulking agent type and mixing-ratio on gaseous emissions.
Further Authors:
A. de Neergaard - University of Copenhagen
L.S. Jensen - University of Copenhagen
Solids separated from animal slurry commonly have a wet weight moisture content of up to 70-80%. Due to this highmoisture content, fibrous or bulky material such as wood chips or crop residues are commonly mixed with solidfraction to adjust the mixture moisture content, to provide structural support and maintain air spaces within thecomposting matrix, while enhancing the biodegradation process. Few studies, however, have been conducted todetermine the effects of ratios of bulking agent to solid fraction on the emissions of CO2, CH4, NH3 and N2O duringcomposting. Increasing concentrations of CO2, CH4, and N2O in the atmosphere are agreed to lead to global warming.Nitrogen loss via NH3 volatilization during composting may reduce the agronomic value of compost as a soilamendment, leads to eutrophication and acidification of land where it is deposited, and may also indirectly contribute togreenhouse effect. We, thus, determined the effects of different types of bulking agent: wood chips (WC), cerealresidue (CR) and lupin residues (LR) addition on GHG emissions during composting of anaerobically digested,centrifugally (decanter centrifuge) dewatered solids (DEC). In order to isolate the effect of bulking agent type (differentC and N availability) and mixing ratios of the compost on gaseous emissions, plastic tube (PT) as an inert bulking agentwas also used for composting of DEC. Two mixing ratios (3:1 and 6:1 of solids:bulking agent on a dry weight basis),and a control with only DEC were evaluated. Experiments were performed in laboratory-scale (10 L) reactors for 28 dunder condition of continuous forced aeration. Physicochemical parameters for solids, bulking agents and mixture ofthese were measured at the beginning and end of composting. Gaseous emissions were continuously measured using aphotoacoustic field gas-monitor (INNOVA 1412) in conjunction with a multipoint sampler (INNOVA 1309). Resultsdemonstrate that most physicochemical parameters exhibited a significant change during composting. Regardless of thedifferences in bulking agent types and ratios of bulking agent to solids, composting mass in all treatments reachedthermophilic conditions. For all treatments, emissions of CO2, CH4 and N2O were found to be the highest at thethermophilic stages, while NH3 emissions exhibited a great variation during composting. During 28 d of composting,however, variation in CO2, CH4, NH3 and N2O emissions due to differences in the mixing ratios across all treatmentswas observed. This research helps to quantify GHG emissions from separated animal slurry solid fraction composting, and should lead to an insight towards better control of composting for reduced emissions.
| Copyright: | © European Compost Network ECN e.V. | |
| Quelle: | Orbit 2012 (Juni 2012) | |
| Seiten: | 4 | |
| Preis inkl. MwSt.: | € 0,00 | |
| Autor: | Albarune Chowdhury  | |
| Artikel weiterleiten | Artikel kostenfrei anzeigen | Artikel kommentieren |
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