The effect of temperature, composition and phase of the composting process on the thermal conductivity of the substrate

Waszkielis, Katarzyna; Wronowski, Rafał; Chlebus, Wojciech; Białobrzewski, Ireneusz; Dach, Jacek; Pilarski, Krzysztof; Janczak, Damian

doi:10.1016/j.ecoleng.2013.09.024

Cited by 46 publications

(20 citation statements)

References 11 publications

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“…Their main biodegradable components are: lactic acid, lactose (so-called "lactic sugar"), fat, and casein. Based on the date in literature [30], as well as chemical knowledge and experience [31][32][33], the authors of presented paper, have proposed the possible directions of biodegradation for the organic waste materials in this experiment; they are shown in the form of chemical reactions (1) to (47). Knowledge about intermediate products of biodegradation of organic matter used as the feed in biogas plants is very important for maximization of the efficiency of anaerobic digestion.…”

Section: Resultsmentioning

confidence: 99%

“…Their hydrolysis is based on decomposition into glycerol and palmitic acid (18) and linoleic acid (19). The two acids are decomposed in the acidogenic phase into simpler chemical compounds, denoted as A P to G P for palmitic, and A L to H L for linoleic acid (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32). The products of decomposition of the two acids comprise, essentially, the following: ethyl alcohol; 2-oxopropanoic acid; 1,4-butanedioic acid; 2-hydroxypropanoic acid; propan-2-one; methyl alcohol and methanoic acid.…”

Section: Hydrolysismentioning

confidence: 99%

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Treatment of dairy waste by anaerobic co-digestion with sewage sludge

Pilarska

Pilarski

Witaszek

et al. 2016

Ecological Chemistry and Engineering S

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Abstract:The results of anaerobic digestion (AD) of buttermilk (BM) and cheese whey (CW) with a digested sewage sludge as inoculum is described. The substrate/inoculum mixtures were prepared using 10% buttermilk and 15% cheese whey. The essential parameters of the materials were described, including: total solids (TS), volatile solids (VS), pH, conductivity, C/N ratio (the quantitative ratio of organic carbon (C) to nitrogen (N)), alkalinity, chemical oxygen demand (COD). The potential directions of biodegradation of the organic waste types, as used in this study, are also presented. Appropriate chemical reactions illustrate the substrates and products in each phase of anaerobic decomposition of the compounds that are present in buttermilk and cheese whey: lactic acid, lactose, fat, and casein. Moreover, the biogas and biomethane production rates are compared for the substrates used in the experiment. The results have shown that buttermilk in AD generates more biogas

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Section: Resultsmentioning

confidence: 99%

Section: Hydrolysismentioning

confidence: 99%

Treatment of dairy waste by anaerobic co-digestion with sewage sludge

Pilarska

Pilarski

Witaszek

et al. 2016

Ecological Chemistry and Engineering S

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“…Conventional approaches to the disposal of FW include landfilling, incineration and aerobic composting (Pilarski and Pilarska 2009;Waszkielis et al, 2013). Food waste is also disposed of by anaerobic digestion, which is a promising method .…”

Section: Introductionmentioning

confidence: 99%

Utilization of vegetable dumplings waste from industrial production by anaerobic digestion

Pilarska¹,

Pilarski²,

Ryniecki³

et al. 2017

International Agrophysics

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A b s t r a c t. This paper provides the analysis of results of biogas and methane yield for vegetable dumplings waste: dough with fat, vegetable waste, and sludge from the clarifier. Anaerobic digestion of food waste used in the experiments was stable after combining the substrates with a digested pulp composed of maize silage and liquid manure (as inoculum), at suitable ratios. The study was carried out in a laboratory scale using anaerobic batch reactors, at controlled (mesophilic) temperature and pH conditions. The authors present the chemical reactions accompanying biodegradation of the substrates and indicate the chemical compounds which may lead to acidification during the anaerobic digestion. An anaerobic digestion process carried out with the use of a dough-and-fat mixture provided the highest biogas and methane yields.

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“…Poland), which it a modern, medium-size facility. In Szamotuły area, there are no heavy industry plants, therefore, the treated wastewater does not contain excessive levels of mineral pollutants, including heavy metals, or organic contaminants (Waszkielis et al, 2013). The initial temperatures of the substrate mixtures prepared for composting were 10 and 26°C, for Ex.1 and Ex.2, respectively.…”

Section: Methodsmentioning

confidence: 99%