Variation of soil properties with sampling depth in two different light-textured soils after repeated applications of urban sewage sludge

Hechmi, Sarra; Hamdi, Hassan; Mokni‐Tlili, Sonia; Zoghlami, Rahma Inès; Khelil, Mohamed Naceur; Jellali, Salah; Benzarti, Saoussen; Jedidi, Naceur

doi:10.1016/j.jenvman.2021.113355

Cited by 16 publications

(14 citation statements)

References 81 publications

(105 reference statements)

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“…Total heterotrophic bacteria in soils S and SL were significantly influenced by USS application and soil texture. In this regard, the significant dose-dependent increase of heterotrophs up to the highest counts observed in treatments S120 and SL120 has been previously reported for the same field study after the second, third and fourth USS application (Zoghlami et al 2016;Hamdi et al 2019;Hechmi et al 2021). This improvement is related to the biostimulation and bioaugmentation effects of sludge-borne nutrients and microorganisms on amended soils (Hamdi et al 2007;Wang et al 2017;Balaganesh et al 2020;Hechmi et al 2020).…”

Section: Antibiotic Resistance In Sludge and Soilsupporting

confidence: 74%

“…This improvement is related to the biostimulation and bioaugmentation effects of sludge-borne nutrients and microorganisms on amended soils (Hamdi et al 2007;Wang et al 2017;Balaganesh et al 2020;Hechmi et al 2020). In fact, the enhancement of soil fertility with the sludge dose has consistently been observed in both soils during previous sampling campaigns with significantly higher levels in soil SL (Zoghlami et al 2016;Hamdi et al 2019;Hechmi et al 2020Hechmi et al , 2021. Consequently, the influence of soil texture on THB counts is obvious as higher clay fraction, SOM and CEC in the sandy loam soil result in a greater water and nutrient adsorption capacity with respect to the coarser soil S (Ward and Oades 1993).…”

Section: Antibiotic Resistance In Sludge and Soilmentioning

confidence: 89%

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Co-occurrence of antibiotic and metal resistance in long-term sewage sludge-amended soils: influence of application rates and pedo-climatic conditions

Mokni‐Tlili

Hechmi

Ouzari

et al. 2022

Environ Sci Pollut Res

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Urban sewage sludge (USS) is increasingly being used as an alternative organic amendment in agriculture. Because USS originates mostly from human excreta, partially metabolized pharmaceuticals have also been considered in risk assessment studies after reuse. In this regard, we investigated the cumulative effect of five annual USS applications on the spread of antibiotic-resistant bacteria (ARB) and their subsequent resistance to toxic metals in two unvegetated soils. Eventually, USS contained bacterial strains resistant to all addressed antibiotics with indices of resistance varying between 0.25 for gentamicin to 38% for ampicillin and azithromycin. Sludge-amended soils showed also the emergence of resistome for all tested antibiotics compared to non-treated controls. In this regard, the increase of sludge dose generally correlated with ARB counts, while soil texture had no influence. On the other hand, the multi-antibiotic resistance (MAR) of 52 isolates selected from USS and different soil treatments was investigated for 10 most prescribed antibiotics. Nine isolates showed significant MAR index (≥ 0.3) and co-resistance to Cd, As and Be as well. However, events including an extreme flash flood and the termination of USS applications significantly disrupted ARB communities in all soil treatments. In any case, this study highlighted the risks of ARB spread in sludge-amended soils and a greater concern with the recent exacerbation of antibiotic overuse following COVID-19 outbreak.

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Section: Antibiotic Resistance In Sludge and Soilsupporting

confidence: 74%

Section: Antibiotic Resistance In Sludge and Soilmentioning

confidence: 89%

Co-occurrence of antibiotic and metal resistance in long-term sewage sludge-amended soils: influence of application rates and pedo-climatic conditions

Mokni‐Tlili

Hechmi

Ouzari

et al. 2022

Environ Sci Pollut Res

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“…Most recently, these agricultural wastes have gradually been substituted by "unconventional" biowastes for intensification purposes and due to availability issues [6,11,12]. To reinforce this concept, hundreds of studies have addressed this practice in depth to illustrate the advantages and disadvantages of using different types of biowastes as substitute organic amendments [13,14]. For instance, current debates have included strong references to the many essential properties of wastewater sludge or biosolids, such as their high contents of organic carbon and mineral nutrients and their textural properties, which ensure a slow release of nutrients.…”

Section: Introductionmentioning

confidence: 99%

Reuse of Sludge as Organic Soil Amendment: Insights into the Current Situation and Potential Challenges

et al. 2023

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Sludge generation as an organic by-product of wastewater treatment has seen a consistent increase worldwide due to population growth and industrial activities. This poses a chronic challenge regarding management options and environmental concerns. The agricultural valorization of unconventional organic materials has become inevitable, especially in semi-arid and arid countries that suffer from depleted soils and shortages in farm manure supply. High-income countries have also been interested in this recycling practice to mitigate landfilling or incineration issues. Sewage and some industrial sludges contain a complex mixture of beneficial and harmful substances, which varies with the origin of effluents. Therefore, sludge land application should be well managed in order to achieve sustainable agro-environmental goals. This review paper focuses on different aspects related to sludge reuse in agriculture, starting by investigating the diversity of sludge types and composition. In addition to the preponderant urban sewage sludge, the less-studied industrial sludges, such as those generated from pulp and paper mills or gas-to-liquid industries, are hereby addressed as well. Then, post-land application effects are discussed in relation to sludge quality, dose, and reuse conditions. The present paper also examines the disparities between guidelines that determine sludge conformity for land application in various countries or regions. Accordingly, special attention is given to increasing risks related to emerging pollutants in sludge such as pharmaceuticals, which have been overused since the outbreak of COVID-19 pandemic. This exhaustive investigation will assist the establishment of sustainable strategies for the safe agricultural reuse of biosolids.

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“…This is particularly true for biosolids materials generated from wastewater treatment processes that use Al and Fe salts to reduce P solubility. Biosolids-induced changes in soil chemical properties can also alter the amount and forms of P immobilized in the soil and, consequently, affect P leaching potential (Hamdi et al, 2019;Hechmi et al, 2020Hechmi et al, , 2021.…”

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confidence: 99%

Water table effect on phosphorus solubility in biosolids‐amended soils

Vieira‐Filho,

Silveira,

Kohmann

et al. 2023

Soil Science Soc of Amer J

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The predominantly coarse texture of Florida Spodosols, limited P‐holding capacity, and fluctuating water table present major challenges for management of P, particularly in agricultural areas receiving biosolids. This study evaluated the impacts of water table level on P fate in Spodosols with contrasting P‐management histories. Treatments were a combination of soils with different biosolids histories (control [no biosolids], intermediate and high [biosolids‐P loads of 567 and 706 kg P ha−1, respectively]) and two moisture regimens (drained and flooded [water table at the depth of spodic horizon or 2 cm above soil surface, respectively]). Soil samples (A, E, and B horizons) were packed into PVC columns (96 cm tall, 11 cm in diameter), mimicking the soil profile. Leachate and pore water samples were collected at 2‐week intervals for 20 weeks. Regardless of treatment, proportion of P leached was low (∼0.2% total P mass). This was due to the significant P storage provided by the spodic horizon. Despite elevated soil P levels, Al and Fe added with biosolids reduced P solubility by as much as 55% compared with the control. Although flooding increased P leaching due to the reductive dissolution and hydrolysis of Al‐P and Fe‐P compounds, moisture regimen effects were generally negligible and inconsistent. Soil P storage capacity has been used as a risk assessment tool to determine biosolids‐P applications; however, our data demonstrated that additional field studies are needed to validate this concept, particularly its applicability and interpretation in biosolids‐amended soils that contain appreciable amounts of Fe‐ and Al‐organic complexes.

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Variation of soil properties with sampling depth in two different light-textured soils after repeated applications of urban sewage sludge

Cited by 16 publications

References 81 publications

Co-occurrence of antibiotic and metal resistance in long-term sewage sludge-amended soils: influence of application rates and pedo-climatic conditions

Co-occurrence of antibiotic and metal resistance in long-term sewage sludge-amended soils: influence of application rates and pedo-climatic conditions

Reuse of Sludge as Organic Soil Amendment: Insights into the Current Situation and Potential Challenges

Water table effect on phosphorus solubility in biosolids‐amended soils

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