Comparison of changes in selected polycyclic aromatic hydrocarbons concentrations during the composting and anaerobic digestion processes of municipal waste and sewage sludge mixtures

Siebielska, Izabela

doi:10.2166/wst.2014.417

Cited by 32 publications

(14 citation statements)

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“…More than 8 million tons (dry basis) of sewage sludge from urban wastewater are generated annually in the 27 European Union (EU) countries, of which approximately 20% corresponds to Germany [1]. Moreover, the huge volume of SSL might contain high levels of pollutants (i.e., heavy metals, hormones) [2,3], so it is necessary to find an environmentally sustainable solution to this increasing social problem. Furthermore, the current environmental legislation in the EU applicable to SSL is becoming increasingly strict regarding its land application, which has so far been the most common disposal method for this residue.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

et al. 2020

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In this paper, hydrochars and pyrochars were produced at 260 °C under different residence times (2 and 4 h) using anaerobic digested sewage sludge (SSL) as initial feedstock. The effect of reaction time on the fuel properties of hydrochars and pyrochars was evaluated. Moreover, the combustion kinetics of raw SSL and the derived pyrochars and hydrochars without coal blending were determined at two different air flows (20 and 90 mL/min) and compared. In the same conditions, the yield of hydrochar was significantly lower than that of pyrochar, confirming the different reaction pathways followed in each process. The results showed hydrochars have lower carbon recovery and energy yield than pyrochars, making the latter more suitable for energy purposes. The thermogravimetric combustion study showed that both thermochemical treatments increased the ignition temperature but decreased the burnout temperature, which results in higher stability during handling and storage. However, raw SSL is better for combustion than hydrochar according to the combustibility index. In addition, the kinetic study showed that the activation energy of the combustion of biochars, especially pyrochar, is lower than that of raw SSL, which is advantageous for their combustion.

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Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

et al. 2020

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“…Sewage sludge also contains various contaminants, such as heavy metals, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), pesticides, surfactants, hormones, and many other materials (Walter et al 2006;Oleszczuk and Hollert 2011;Siebielska 2014;Kacprzak et al 2017), which may pose a risk to the environment and human health when applied to agriculture (Richards et al 1998). Sewage sludge amendment of soil has been greatly hampered due to concern over heavy metal contamination in soils and plants (McLaughlin et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Accumulation and bioavailability of heavy metals in a soil-wheat/maize system with long-term sewage sludge amendments

Yang

Zhu

et al. 2018

Journal of Integrative Agriculture

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A long-term field experiment was carried out with a wheat-maize rotation system to investigate the accumulation and bioavailability of heavy metals in a calcareous soil at different rates of sewage sludge amendment. There are significant linear correlations between the contents of Hg, Zn, Cu, Pb, and Cd in soil and sewage sludge amendment rates. By increasing 1 ton of applied sludge per hectare per year in soil, the contents of Hg, Zn, Cu, Pb, and Cd in soil increased by 6.20, 619, 92.9, 49.2, and 0.500 µg kg-1 , respectively. For Hg, sewage sludge could be safely applied to the soil for 18 years at an application rate of 7.5 t ha-1 before content exceeded the soil environmental quality standards in China (1 mg kg-1). The safe application period for Zn is 51 years and is even longer for other heavy metals (112 years for Cu, 224 years for Cd, and 902 years for Pb) at an application rate of 7.5 t ha-1 sewage sludge. The content of Zn and Ni in wheat grains and of Zn, Cu, and Cr in maize grains increased linearly with increasing sewage sludge amendment rates. The content of Zn, Cr, and Ni in wheat straws and Zn, Cu, and As in maize straws were positively correlated with sewage sludge amendment rates, while the content of Cu in wheat straws and Cr in maize straws showed the opposite trend. The bioconcentration factors of the heavy metals in wheat and maize grains were found to be in the order of Zn>Cu>Cd>Hg>Cr, Ni>Pb>As. Furthermore, the bioconcentration factors of heavy metals in wheat were greater than those in maize, indicating that wheat is more sensitive than maize as an indicator plant. These results will be helpful in developing the critical loads for sewage sludge amendment in calcareous soils.

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“…In aerobic conditions mostly carbon dioxide and water are generated and in anaerobic decomposition -methane and water. Such decomposition is caused by microorganisms that activate themselves at specifi c temperature, humidity and in presence of nutrients (Janowska and Szymański 2009, Siebielska 2014, Siebielska and Sidełko 2015. Depending on oxygen conditions that occur in landfi ll, aerobic or anaerobic bacteria prevail (Kjeldsen et al 2002, Renou et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Migration of pollutants in porous soil environment

Szymański¹,

Janowska²

2016

Archives of Environmental Protection

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Abstract:Landfi ll leachate makes a potential source of ground water pollution. Municipal waste landfi ll substratum can be used for removal of pollutants from leachate. Model research was performed with use of a sand bed and artifi cially prepared leachates. Effectiveness of fi ltration in a bed of specifi c thickness was assessed based on the total solids content. Result of the model research indicated that the mass of pollutants contained in leachate fi ltered by a layer of porous soil (m f ) depends on the mass of pollutants supplied (m d ). Determined regression functions indicate agreement with empirical values of variable m′ f . The determined regression functions allow for qualitative and quantitative assessment of infl uence of the analysed independent variables (m′ d , l, ω) on values of mass of pollutants fl owing from the medium sand layer. Results of this research can be used to forecast the level of pollution of soil and underground waters lying in the zone of potential impact of municipal waste landfi ll.

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Comparison of changes in selected polycyclic aromatic hydrocarbons concentrations during the composting and anaerobic digestion processes of municipal waste and sewage sludge mixtures

Cited by 32 publications

References 0 publications

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

Accumulation and bioavailability of heavy metals in a soil-wheat/maize system with long-term sewage sludge amendments

Migration of pollutants in porous soil environment

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