Heavy Metals in Animal Manure and Effects of Composting on It

Vukobratović, Marija; Vukobratović, Želimir; Lončarić, Zdenko; Kerovac, D.

doi:10.17660/actahortic.2014.1034.75

Cited by 10 publications

(8 citation statements)

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“…Hence, it was necessary to study the physicochemical properties of both treated and untreated manure. The findings regarding the concentration of heavy metals are in line with those obtained by previous research on pig manure, which also proved that the bioavailability of heavy metals decreases during the composting process, with the high temperature during compost being assumed to play a key role (Shehata et al, 2019; Vukobratović et al, 2014). Manure is considered to be a slower fertilizer than slurry, mainly because of the nitrogen available to plants.…”

Section: Discussionsupporting

confidence: 90%

Pig manure treatment strategies for mitigating the spread of antibiotic resistance

Zalewska

Błażejewska

Czapko

et al. 2022

Preprint

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One of the most important public health challenges facing the world today is that posed by antibiotic resistance. Many pathogenic antibiotic-resistant bacteria and their antibiotic resistance genes, usually located on mobile genetic elements, are frequently present in the faeces of farm animals. To prevent the possibility of antimicrobial resistance transfer to the environment, these faeces should undergo treatment before being used as natural fertilizer. The two strategies for processing pig manure proposed in this study, viz. storage (most commonly used for livestock manure today) and composting, are cheap and do not require special tools or technologies. The present study examines the changes in the physicochemical properties of treated manure, in the microbiome, through metagenomic sequencing, and in the resistome, using the SmartChip Real-time PCR system compared to raw manure. This is the first such comprehensive analysis performed on the same batch of manure. Our results suggest that while none of the processes completely eliminates the environmental risk, composting results in a faster and more pronounced reduction of mobile genetic elements harbouring antibiotic resistance genes, including those responsible for multi-drug resistance. The physicochemical parameters of the treated manure are comparable after both processes; however, composting resulted in significantly higher organic matter. Overall, it appears that the composting process can be an efficient strategy for mitigating the spread of antibiotic resistance in the environment and reducing the risk of its transfer to agricultural crops and hence, the food chain. It also provides the organic matter necessary for humus formation, and increases the sorption properties of the soil and the micro and macro elements necessary for plant growth, which in turn translates into increased soil productivity.HighlightsThe changes in microbial population composition correlate with changes in specific antibiotic-resistance genes and mobile genetic elements in the studied populations.Positive correlations have been demonstrated between microbial phyla and genes coding the multi-drug resistance mechanismCo-occurrence networks showed positive correlations between antibiotic-resistance genes and mobile genetic elementsThe composting strategy was most efficient at reducing microbial loads, antibiotic resistance genes and mobile genetic elements.Composted manure can be part of a natural, safe soil fertilization strategy.

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Section: Discussionsupporting

confidence: 90%

Pig manure treatment strategies for mitigating the spread of antibiotic resistance

Zalewska

Błażejewska

Czapko

et al. 2022

Preprint

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“…It should be mentioned that except for Se, levels of essential minerals and toxic elements in poultry litters were lower than the values reported in the research of several authors [27][28][29][30][31][32][33][34]. Selenium contents in animals' feeds are influenced by soil Se content and Se supplementation to meet animal requirements [56].…”

Section: Heavy Metals In Poultry Diets and Littermentioning

confidence: 88%

Evaluation of Heavy Metal Content in Feed, Litter, Meat, Meat Products, Liver, and Table Eggs of Chickens

Korish

Attia

2020

Animals

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We assessed the concentrations of Fe, Cu, Zn, Mn, Se, Co, Cr, Pb, Cd, and Ni in chicken meat and meat products, feed, and litter, as well as laying hens’ eggs, feed and litter to monitor the quality of products on the market and their safety for human consumption as judged by recommended daily allowance (RDA) and tolerable upper levels. Samples were chosen as the most popular poultry products in Saudi Arabia. A total of 45 broiler samples of frozen or fresh meat, liver, burger, or frankfurter were chosen from the same brand. Additionally, 60 table eggs from four commercial brands were collected, and the edible parts of these were used to determine levels of minerals and toxic elements. Furthermore, 30 feed and litter samples were collected from the starter, grower, and layer diets of broilers and laying hens. The results indicated that there were significant levels of most of the trace elements and heavy metals in the different meat sources. Furthermore, the liver contained the highest levels of elements, except for Cr, Co, and Ni. The highest Cr level was detected in the fresh meat, followed by frozen meat. Trace elements (Mn and Co) and heavy metals (Ni and Pb) were not detected in either the frozen or the fresh meat. The chicken burger and the frankfurter exhibited similar trace-element and heavy-metal contents, except for Zn and Mn, as the frankfurter showed higher concentrations than the burger. Differences in most of the trace and toxic elements among the different sources of eggs were not found to be significant, except for Zn. Differences between the broiler meat and table eggs were only substantial for Fe and Zn. Fe was significantly higher in meat than in eggs, and the opposite trend was found for Zn. The liver contained higher heavy metals than the eggs, except for Cr. In addition, the burger had higher concentrations of essential (Cu and Co) and heavy metals (Pb and Ni) than the eggs but had lower levels of Zn and Cr. The frankfurter exhibited significantly higher levels of Fe, Cu, Mn, Co, Pb, and Ni than the eggs but lower levels of Zn and Cr. To summarize, Cd, Pb, As, and Se were not detected in the broiler meat or eggs, indicating no risks from these toxic elements. Conversely, the liver exhibited the highest content of heavy metals, except for Cr, indicating that the intake of Pb and Cd was above the recommended daily allowance (RDA) for adults. The meat products exhibited higher Pb, Cd, and Ni levels than the broiler meat and the table eggs, suggesting that they posed a health threat to humans, and the intake of Pb in the meat products was higher than the RDA. Thus, chicken meat and table eggs, which are primary protein sources, are safe sources of human nutrition, while liver and meat products may present potential health hazards through the food chain.

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“…Additionally, application of livestock manure and organic waste as handy manures for the farmers caused accumulation of heavy metals in soil. Vukobratović et al (2014) revealed that although composted manures play an important role in maintaining soil fertility, but they can be a significant source of heavy metals. Therefore, manure derived by various livestock comprising different concentrations of heavy metals must be monitored during composting.…”

Section: Soil Pollution Risk Assessmentmentioning

confidence: 99%

Towards a Sustainable Agriculture Development Based on the Field Vulnerability Evaluation in Miandoab Region, Iran

Vaziri

Mahmoudi

Shahbazi

et al. 2022

Nexo Revista Científica

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Exploring the agro-ecological limits is necessary in sustainable agriculture development. Soil contamination and erosion are two main indices in land vulnerability evaluation. Raizal and Pantanal models within MicroLEIS DSS, the Ero&Con package, were established in identification of vulnerable areas due to erosion and contamination risks, respectively. This study was performed in Miandoab region under different land-use scenarios with approximately 5269 ha extension in the North-West of Iran (west Azarbaijan). The extracted morphological and analytical data from 62 soil profiles representative of the study area were used as basic information. A total of 17 land unites were then classified according to the Geopedologic approach. The benchmark soil profiles were categorized as Typic Torripsamments, Typic Haploxerepts, Typic Haplocambids and Typic Haplargids. The results taken by using the aforementioned models were presented as an attainable mode whereas the management practices were not mentioned. The application of Raizal model revealed that the water erosion has less impact than wind erosion on vulnerability classes whereas climate change will result extremely high vulnerable area in the future. In terms of soil contamination risks resulted by Pantanal model, phosphorous risks were classified in V2 (23%) and V4 (77%). Also, heavy metal and nitrogen as well as pesticide contamination vulnerability risks were classified as V3 and V4. Since there was no different in classes when cultivating maize and wheat, the attainable vulnerability classes are equal with the actual ones. Overall, this research demonstrates that application of models increase our understanding about the behavior of soil and landscape interactions.

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Heavy Metals in Animal Manure and Effects of Composting on It

Cited by 10 publications

References 0 publications

Pig manure treatment strategies for mitigating the spread of antibiotic resistance

Pig manure treatment strategies for mitigating the spread of antibiotic resistance

Evaluation of Heavy Metal Content in Feed, Litter, Meat, Meat Products, Liver, and Table Eggs of Chickens

Towards a Sustainable Agriculture Development Based on the Field Vulnerability Evaluation in Miandoab Region, Iran

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