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Seleiman, Mahmoud F.; Santanen, Arja; Mäkelä, Pirjo S.A.
Resources, conservation and recycling, April 2020, 2020-04-00, Letnik: 155Journal Article
•Sludge contains recyclable and agronomical valuable macro and micronutrients.•Sludge application on cropland reduces need of synthetic fertilizers, causing sustainability of agriculture.•Sludge can contain harmful organic and inorganic contaminants.•In some cases, sludge application on cropland can contaminate water, soil & food chain.•Interaction of inorganic and organic compounds with environment should be investigated for long-term risks. Digested sludge is a good source of plant nutrients. However, depending on the feedstock, it might contain heavy metals, metalloids, organic compounds, pathogens, and pharmaceuticals, which can cause adverse effects on crop growth and contaminate the groundwater, soil, and food chain. The aim of this review is to focus on the potential risks of inorganic and organic contaminants to plant growth, soil, groundwater, and consequently the food chain and environment related to the utilization of digested sludge as a fertilizer on cropland. Inorganic compounds, such as metals and metalloids, in sludge can occasionally cause reductions in soil microbial biomass. In general, the uptake of metals and organic contaminants does not appear to cause a significant hazard to the plants and the concentrations do not surpass the maximum values allowed in soil. Organic compounds, harmful for human health or the environment, are to a large extent decomposed or volatilized from the land treated with sludge, which decreases their leaching into the environment. Many of the organic compounds are lipophilic and can be bound to soil organic matter. In conclusion, the application of sludge on cropland might be a sustainable management practice; however, further investigations are needed to determine the accumulation and persistence of possible hazardous emerging chemicals and pathogens in the environment and formation of harmful intermediate reaction of inorganic and organic compound products.
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