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Distribution of Oxyphinic Elements in Sewage Sludge Fractions Based on Manganese and Nickel

Jakubus Monika

Journal of Ecological Engineering

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2021

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Vol. 22, nr 6

72--82

EN

Owing to the chemical composition of sewage sludge (SS), it may be used as an alternative to fertilizers; however, before land application, it must be assessed in terms of its contents of heavy metals considering their potential mobility in the soil. The aim of this study was focused on evaluating the potential mobility of oxyphinic elements – Mn and Ni in SS. The samples were collected from 4 different wastewaters treatment plants located in the Wielkopolska province at the same time points in 3 consecutive years. The levels of Mn and Ni were assessed using the BCR sequential method. The risk assessment code, and individual contamination factor were additionally calculated. The sewage sludge from small WWTPs was characterised by significantly lower amounts of metals in comparison to those originating from the large ones. It was found that both metals were dominant in loosely and relatively loosely bound fractions of all analyzed SS. It was confirmed by high values of risk assessment codes and individual contamination factor. Mn and Ni belonging to the group of oxyphinic elements showed significant similarities in the distribution of SS fractions. Large and rapidly activated pool of Mn and Ni may be a beneficial and valuable source of nutrients for plants, but certain dangers related to the possible accumulation of these elements in soils could be also considered.

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Valorisation of sewage sludge humic compounds in the aspect of its application in natural environment

Jakubus Monika, Bakinowska Ewa, Tobiašová Erika

Environment Protection Engineering

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2021

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Vol. 47, nr 1

67--83

EN

The valorization of sewage sludge (SS) has been presented originating from four wastewaters treated in wastewater treatment plants (WWTPs) located in the Wielkopolska province. In the SS samples collected in two successive years, the quantity and quality of humic substances (HSs), fulvic and humic acids (FAs, HAs), amounts of organic carbon (TOC), organic matter (OM), labile carbon (CL), and water extracted organic carbon (WEOC) were determined. It was investigated how the defined parameters depend on the size of the installation and select those which in a routine SS analysis facilitate rapid assessment of their quality and suitability for application in the natural environment. Regardless of WWTP size and the year of analysis, SS was characterized by a significant share of easily decomposable compounds such as FAs and WEOC. The statistical analysis showed significant usefulness of CL, FAs, and HAs in the evaluation of SS quality and usability.

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Social participation in the biowaste disposal system before and during the COVID-19 pandemic. A case study for Poznań

Jakubus Monika, Michalak-Oparowska Weronika

Environment Protection Engineering

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2021

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Vol. 47, nr 2

109--123

EN

The degree of awareness and participation of the city inhabitants concerning biowaste segregation in Poznan has been examined. The assessment was based on a questionnaire survey of a local community, conducted in 2019 and 2020. Within the course of one year, a considerable increase was observed in the number of people involved in selective biowaste collection, at the simultaneous lower degree of acceptance for the operating system, which was evident particularly in the group of surveyed men. Among the respondents, the youngest group, represented by people aged 16-25 years, showed the lowest degree of knowledge and activity in the process of segregation. Regardless of the year of the study the greatest involvement in biowaste segregation was found among older people, individuals with university education, and those living in detached houses. A vast majority of respondents indicated the need to increase the number and scope of educational campaigns as one of the possibilities to improve the current, still unsatisfactory level of public participation. The effect of COVID-19 on social participation has not been directly confirmed; however, based on changes in the attitudes of Poznan inhabitants and growing amounts of biowaste such dependencies may be tentatively assumed.

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Municipal solid waste management systems in Poland and the Czech Republic. A comparative study

Jakubus Monika, Stejskal Bohdan

Environment Protection Engineering

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2020

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Vol. 46, nr 3

61--78

EN

The work provides an overview of methods of waste collection and treatment in Poland and the Czech Republic. Differences ( in contrast to Poland, MBT technology is not used in the Czech Republic and only one incineration plant works) and similarities (similar share of waste management methods, the comparable mass of generated municipal solid waste per capita and similarly low sorting rate) between both countries have been indicated focusing on various fractions of municipal solid wastes as well as the dominant system of their management. SWOT analysis focused on the municipal solid waste management of both countries has been created. In Poland, the proportion between small amounts of waste collected selectively and the mass of waste sent to landfills is not satisfactory. In the Czech Republic, lots of municipal solid waste is deposited in landfills.

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Application of biological methods to assess the toxicity of soils contaminated with heavy metals and the effectiveness of stabilisation processes

Tatuśko-Krygier Natalia, Jakubus Monika

Environment Protection Engineering

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2019

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Vol. 45, nr 4

33-43

EN

Short-term biotests were used to determine the effectiveness of the use of compost and fly ash in the stabilization of heavy metals in contaminated soil. For this purpose, in two independent experiments, either compost (3:1) or fly ash (1:1) were added to soil contaminated with heavy metals. To assess seed germination and root elongation of Sorghum saccharatum L., Lepidium sativum L., Sinapis alba L. after three days a Phytotoxkit test was used. Seedling emergence and biomass yield after 21 days were evaluated. Obtained data indicate better practical applicability of the seedling emergence test thanks to the longer duration resulting in more reliable conclusions provided in that test. A short, 3-day test did not confirm any effective stabilizing role of theapplied additives. Sorghum saccharatum L. turned out to be most sensitive to the altered soil conditions, while Lepidium sativum L. was most tolerant.