Two composting phases running in different process conditions timing relationship

Sidełko, Robert; Janowska, Beata; Walendzik, Bartosz; Siebielska, Izabela

doi:10.1016/j.biortech.2010.03.092

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…Such a low ratio was probably caused by the material having a high total nitrogen content, which would have been caused by the sewage sludge component of the material to be composted. A high nitrogen content is typical of sewage sludge (Sidełko et al, 2010). Similar C:N ratios, of 13:1, were found in mixtures for composting by Cai et al (2007), and Oleszczuk found ratios as low as about 5:1 (Oleszczuk 2007).…”

Section: Physical and Chemical Parameters In The Composting Processmentioning

confidence: 99%

Polychlorinated biphenyl concentration changes in sewage sludge and organic municipal waste mixtures during composting and anaerobic digestion

Siebielska

Sidełko

2015

Chemosphere

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Section: Physical and Chemical Parameters In The Composting Processmentioning

confidence: 99%

Polychlorinated biphenyl concentration changes in sewage sludge and organic municipal waste mixtures during composting and anaerobic digestion

Siebielska

Sidełko

2015

Chemosphere

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“…When the composting process is performed, due to a high concentration of nitrogen in sewage sludge being 2-7% d.m. [21][22][23], supplementation consisting in addition of material increasing the organic carbon share in the composting mass is used [24][25][26].…”

Section: Countrymentioning

confidence: 99%

Immobilization of Zn and Cu in Conditions of Reduced C/N Ratio during Sewage Sludge Composting Process

2022

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In this paper we present results of research on the transformation of chemical forms of two elements (Cu, Zn) that occurred at the highest concentration in sewage sludge being processed in a composting process. The factor that had impact on the direction of the observed transformation was the amount of straw added to the mix with sewage sludge at the batch preparation stage including elimination of an additional source of organic carbon (straw). The analysis of contents of Cu and Zn chemical forms was performed applying Tessiere’s methodology. It was ascertained that reduction of supplementation has positive impact on the allocation of tested elements in organic (IV) and residual (V) fractions with a simultaneous decrease of heavy metals mobile forms share in bioavailable fractions, mostly ion exchangeable (I) and carbonate (II). Using an artificial neural network (ANN), a tool was developed to classify composts based on Austrian standards taking into account only I ÷ IV fractions treated as a labile, potentially bioavailable, part of heavy metals bound in various chemical forms in compost. The independent variables that were predictors in the ANN model were the composting time, C/N, and total content of the given element (total Cu, Zn). The sensitivity coefficients for three applied predictors varied around 1, which proves their significant impact on the final result. Correctness of the predictions of the generated network featuring an MLP 3-5-3 structure for the test set was 100%.

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“…Due to high content of macroelements, mainly organic carbon, nitrogen and phosphorus, mechanically dehydrated sewage sludge makes a valuable raw material for production of compost, which complies with the requirements set for soil improvers and materials substituting soil in growing media (Pinasseau et al 2018, Regulation EU 2019. High concentration of total nitrogen in mechanically dehydrated sewage sludge generally falling into 2-7% DM (dry matter) interval (Sidełko et al 2010(Sidełko et al , Świerczek et al 2018) and its high humidity amounting to 85-75% (Kacprzak et al 2017) causes that composting of sewage sludge requires use, at the compost mass formation stage, of a supplement featuring high concentration of organic carbon and low nitrogen content (Hamoda et al 1998, Zhang et al 2010, Doublet et al 2010. The optimum C/N ratio at the compost formation commencement point should fall, according to various sources, within 20-30 interval (Sidełko et al 2011(Sidełko et al , 2017 whereas value of this parameter in dehydrated sewage sludge generally does not exceed 7 (Kacprzak et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Influence of Decreasing Supplementation to Transformation of Chemical Forms of Ni, Zn and Cu During Composting of Sewage Sludge

Sidełko

2021

RoczOchrSrod

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This paper pertains to the influence of decreasing supplementation to transformation of chemical forms of Ni. Zn and Cu during composting of sewage sludge. A universally used supplementing material constituting a rich source of organic carbon is straw. Addition of straw to sewage sludge is aimed at increasing C/N proportion up to at least 15 due to the risk of formation of toxic forms of nitrogen, concentration of which in sewage sludge is exceptionally high. We have presented in this paper the results of speciation research of three elements applying Tessier’s sequential extraction. It’s been proven that decreasing of straw share in the composted mixture with sewage sludge down to the level of C/N value below the admissible value, has a beneficial effect on the allocation of tested heavy metals towards the forms that are permanently bound in compost matrix. A systematic increase of organic (IV) and residual (V) fractions share and decrease of mobile forms of heavy metals content in bioavailable fractions i.e. ion-exchange (I) and carbonate (II) has been ascertained.

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Two composting phases running in different process conditions timing relationship

Cited by 12 publications

References 13 publications

Polychlorinated biphenyl concentration changes in sewage sludge and organic municipal waste mixtures during composting and anaerobic digestion

Polychlorinated biphenyl concentration changes in sewage sludge and organic municipal waste mixtures during composting and anaerobic digestion

Immobilization of Zn and Cu in Conditions of Reduced C/N Ratio during Sewage Sludge Composting Process

Influence of Decreasing Supplementation to Transformation of Chemical Forms of Ni, Zn and Cu During Composting of Sewage Sludge

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