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Assessment of the possibilities of agricultural use of sewage sludge from small, medium and large wastewater treatment plants

Czarnota Joanna, Kurcek Justyna, Twaróg Natalia

Czasopismo Inżynierii Lądowej, Środowiska i Architektury / Journal of Civil Engineering, Environment and Architecture

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2020

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Vol. 37, No. 67

19--32

EN

The management of sewage sludge, generated at various stages of wastewater treatment, is still a significant problem. One of the possibilities of using sewage sludge, which is a valuable source of nutrients (carbon, nitrogen, phosphorus), is its use for agricultural purposes. Sludge can be used for fertilising when it meets the requirements with regard to the content of heavy metals, the number of eggs of intestinal parasites and Salmonella bacteria, and when the amount of organic substances and fertilising components is sufficient. That is why it is so important to know exactly the characteristics of sewage sludge. This allows determination of whether it can be used as fertiliser in agriculture. The study assesses the agricultural use of sewage sludge from three mechanical and biological wastewater treatment plants of different PE, produced in 2016-2018. The analysis was carried out on the basis of the physicochemical parameters of the sludge. Particular attention was paid to the fertilisation and sanitary properties, as well as the presence of heavy metals, which were largely influenced by such factors as: the size of the wastewater treatment plant, the method of sewage sludge treatment and sludge management, and the nature of the catchment area. The concentrations of particular substances in sludge from wastewater treatment plants differed from one another, and sometimes these were very large differences. The conducted analysis showed that sewage sludge, from both small and large wastewater treatment plants, has a significant potential as agricultural fertiliser due to the presence of minerals such as nitrogen, phosphorus and calcium.

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Methods used in disinfections of wastewater and sewage sludge - short review

Hawrylik Eliza

Architecture Civil Engineering Environment

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2020

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Vol. 13, no. 2

57--63

EN

Wastewater and sewage sludge are a place of occurrence of many microorganisms, including viruses, pathogenic and relatively pathogenic bacteria. They can leak into other environments, i.e. receiver waters or soil, thus creating a biological hazard. Increasing the sanitary level of safety of municipal wastewater treatment plants requires the introduction of disinfection of sewage and sewage sludge. The purpose of this article is a short review of the literature on methods used in disinfection of wastewater and sewage sludge. The work discusses the sanitary characteristics of wastewater and sewage sludge, primarily paying attention to the physical and chemical methods used to disinfect them. In addition, attention was also paid to the aspect of practical use of disinfection in municipal wastewater treatment plants around the world.

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Chemical and microbiological assessment of fatty residues for farming purposes

Latała A., Wierzba S., Farbiszewska T., Polaczek B.

Polish Journal of Chemical Technology

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2005

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Vol. 7, nr 2

28-30

EN

The present study was aimed to make a chemical and microbiological assessment of fatty residues from the municipal and industrial liquid waste purification unit of the Odra Fat-Processing Plant of Brzeg, Poland. The assessment was made towards the land use of the residues. Microbiological tests embraced a quantitative and qualitative analysis of the residues; chemical tests were aimed at marking the contents of fatty substances, macroelements and heavy metals. The fatty residues from the present study were of a potentially high fertilizing quality as they contained considerable amounts of organic carbon, nitrogen, phosphorous and magnesium. The content of heavy metals did not exceed the maximum allowed values for the residues to be used in farming. There were two factors which inhibited the possibility of the ready use of the residues in farming: a high coli count and a 30% content of fatty substances. A significant number of lipolytical bacteria in the count of bacteria isolated from the waste, creates favourable conditions for their biodegradation by the composting method.