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Influence of Storage Conditions on a Quality of Pelletized Waste-Derived Fertilizer

Pawłowska Małgorzata, Bielińska Jolanta E., Kasprzycka Agnieszka

Journal of Ecological Engineering

2019

Vol. 20, nr 3

226--233

A mixture of digestates from biogas plant and bottom ashes from biomass combustion can be a valuable source of nutrients and organic substances as well as an improver of the adsorption capacity and water-air properties of the soil. Pelletization of such a mixture makes its composition more stable and the handling easier. However, the properties of pelletized fertilizer are affected by the external factors. The paper presents the results of the research on the impact of air accessibility during the storage of fertilizer pellets produced on the basis of digestate from biogas plants, bottom ashes derived from the biomass combustion and mineral additives (quicklime, zeolite and bentonite) on their fertilizing properties, enzymatic activity and technical parameters, such as resistance to mechanical loads. The research showed that the fertilizers stored under the roof, exposed to the atmospheric air for 1 year, contained by 5.5% more water compared to the samples shielded from the air. These more humid fertilizers were also characterized by slightly higher nitrogen content and 1.7-fold lower enzymatic activity of dehydrogenases and 1.6-fold higher activity of phosphatases, but their resistance to mechanical loads, both static and dynamic was lower. On the other hand, the effects of storage conditions on the urease activity and the content of potassium, phosphorus and heavy metals were not observed. Generally, the storage of fertilizers in airtight containers is more advantageous, because under such conditions the changes in the fertilizing properties are insignificant, while their resistance to mechanical loads is much higher.

Chemical stability and sanitary properties of pelletized organo-mineral waste-derived fertilizer

Kasprzycka A., Lalak-Kańczugowska J., Tys J., Chmielewska M., Pawłowska M.

Archives of Environmental Protection

2018

Vol. 44, no. 3

106--113

Different types of organic waste can be used as fertilizers or soil improvers, but such materials are susceptible to chemical and biochemical decomposition, and their storage can entail a deterioration in their quality. Evaluation of the infl uence of water content and ambient temperature on the chemical and microbiological properties of pelletized organo-mineral fertilizer produced on the basis of digestate from biogas plant and ashes from biomass combustion was the aim of the study. The results of the short (one month’s storage in the – laboratory silo) and long-term (one year’s storage in – unheated compartment) studies showed that the quality of the fertilizer depends on the temperature, fertilizer humidity, and air accessibility. The growth in the temperature from 20 to 30°C decreased the content of total and ammonium nitrogen, while the increase in water content stimulated the development of the fungi in fertilizer stored at 20 and 30°C. The access of the ambient air resulted in the increase of moisture and volatile solids content in the fertilizer. It was stated that fertilizer should be stored without access to the atmospheric air, at the temperature below 20°C to ensure their long-term chemical stability and microbial safety.

Celem pracy jest ocena wpływu wilgotności, temperatury i dostępu powietrza na właściwości chemiczne i mikrobiologiczne granulowanego nawozu wytworzonego na bazie pofermentu z biogazowni i popiołów ze spalania biomasy. Wyniki badań krótkoterminowych i długoterminowych wykazały, że jakość nawozu zależy od temperatury, wilgotności nawozu i dostępności powietrza. Wzrost temperatury od 20 do 30°C znacząco obniżył zawartość azotu, a wzrost wilgotności stymulował rozwój grzybów. Dostęp powietrza powodował wzrost wilgotności i zawartości substancji organicznej w nawozie. Stwierdzono, że w celu zapewnienia długoterminowej stabilności chemicznej i bezpieczeństwa mikrobiologicznego nawóz należy przechowywać bez dostępu powietrza, w temperaturze poniżej 20°C.