Article
Environmental Sciences
Ilaria Gabriele, Marco Race, Stefano Papirio, Patrizia Papetti, Giovanni Esposito
Summary: This study proposes the use of Cannabis sativa L. for the phytoremediation of PYR-contaminated soil. The results showed that the highest PYR removal rate achieved by hemp was approximately 95%, which was 35% higher compared to the unplanted control. The initial PYR concentration affected the growth and phytoremediation potential of C. sativa L., with lower initial concentrations resulting in higher PYR removal. The interaction between plant roots and rhizosphere microorganisms may play a role in PYR removal.
Article
Engineering, Environmental
Paulina Godlewska, Patryk Oleszczuk
Summary: The study found that biochar derived from a mixture of SL and biomass (SLW) had a better effect on the persistence and bioavailability of PAHs in soil compared to biochar derived solely from sewage sludge (SL).
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Magdalena Konczak, Paulina Godlewska, Malgorzata Wisniewska, Patryk Oleszczuk
Summary: This study examines the effects of biochar derived from sewage sludge (BCSSL) or sewage sludge/biomass (BCSSLW) on the persistence and bioavailability of polycyclic aromatic hydrocarbons (PAHs) in soils with different properties. The results show that the content of organic solvent extractable PAHs decreases when biochar is applied to the soils, depending on pH and feedstock. Similarly, the content of freely dissolved PAHs also decreases. The bioavailability and persistence of PAHs in the biochar-amended soils are closely related to the chemical properties of the soils, as indicated by the significant relationships between PAH content and pH, cation exchange capacity, available nutrients, and dissolved organic carbon.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Claire Baranger, Isabelle Pezron, Laurence Lins, Magali Deleu, Anne Le Goff, Antoine Fayeulle
Summary: Hydrophobic organic soil contaminants like PAH are poorly mobile in soil and filamentous fungi are efficient in degrading them, but the mechanism of their mobilization needs further investigation. A microfluidic device was designed to study the uptake of BaP by fungi, revealing the uptake and storage mechanisms as well as the release of surface-active compounds.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Hengda Han, Aishu Li, Hanjian Li, Song Hu, Yi Wang, Limo He, Jun Xu, Xun Hu, Sheng Su, Jun Xiang
Summary: Calcium oxide has a significant impact on reducing the light substituted polycyclic aromatic hydrocarbons released from sewage sludge pyrolysis and inhibiting the formation of heavy ones. The mechanisms involve catalyzing or reacting with different components in the sludge model compounds to affect the content and formation of aromatics. The decrease in nitrogen substituted polycyclic aromatic hydrocarbons released from sludge can be attributed to the synergy effects of CaO and other minerals or the effects of CaO on the interaction between protein and other organics.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Rosa Posada-Baquero, Kirk T. Semple, Miguel Ternero, Jose-Julio Ortega-Calvo
Summary: The study utilized desorption extraction method standardized by ISO16751 to determine the bioavailable concentration of the commonly regulated polycyclic aromatic hydrocarbon benzo(a)pyrene (BaP) in industrial soil, showing comparable results to field-contaminated soils.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Inorganic & Nuclear
Huimin Zhong, Cong Jiang, Jiahui Zou, Guancheng Zhu, Yanyan Huang
Summary: In this study, CeO2-based porous carbonaceous frameworks (CeO2 PCFs) were used as antioxidant nanozymes to scavenge reactive oxygen species and absorb benzo[a]pyrene. CeO2 PCFs exhibited excellent superoxide dismutase-like and catalase-like activity, effectively eliminating superoxide radical, hydroxyl radical, and hydrogen peroxide. The 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) free radical scavenging assay confirmed the free radical scavenging ability of CeO2 PCFs. Furthermore, CeO2 PCFs with large surface area and porous structure efficiently adsorbed benzo[a]pyrene. The designed CeO2 PCFs can serve as new antioxidant nanozymes for scavenging reactive oxygen species and adsorbing polycyclic aromatic hydrocarbons (PAHs).
INORGANIC CHEMISTRY
(2023)
Article
Energy & Fuels
Mozhdeh Alipour, Hossein Asadi, Chengrong Chen, Ali Asghar Besalatpour
Summary: The use of biochar and hydrochar as organic soil fertilizers is increasing in popularity, but little research has been done on the removal of organic pollutants. This study found that pyrolysis and hydrothermal carbonization are promising methods for removing organic pollutants from sludges, particularly with pyrolysis at high temperatures leading to complete removal of the pollutants.
Article
Environmental Sciences
Wenjing Shi, Hui Gong, Weiqi Zhou, Xuejun Tan, Chen Zhang, Xiaohu Dai
Summary: The objective of this study was to compare the distribution and ecological risk of PAHs in the sewage collection and treatment system of four cities in the middle and lower reaches of the Yangtze River. The results showed that the mean concentration of 16 sigma PAHs was higher in sewer sediments than in sewage sludge. The major sources of PAHs in sewage sludge were petroleum sources, coal tar, and coking activities, while PAHs in sewer sediments primarily came from wood combustion, automobile emissions, and diesel engine emissions. Both sewage sludge and sewer sediments had medium ecological risk based on the assessment of sigma PAHs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Tingting Liu, Lifeng Tian, Zhengang Liu, Jie He, Haihui Fu, Qifei Huang, Honghai Xue, Zechun Huang
Summary: Hydrothermal carbonization (HTC) of sewage sludge (SS) with and without calcium oxide (CaO) was conducted at temperatures ranging from 160 to 240 degrees Celsius. The study evaluated the yield and distribution of polycyclic aromatic hydrocarbons (PAHs), showing that temperature increase led to higher PAH concentration in hydrochar, while the addition of CaO reduced PAH yield with optimal results observed at 200 degrees Celsius with 3-6% CaO.
Article
Water Resources
Ewa Wisniowska, Maria Wlodarczyk-Makula
Summary: This study investigated the sorption capacity of microplastic fibers towards carcinogenic polycyclic aromatic hydrocarbons (PAHs) and found that microfibers can adsorb PAHs, leading to their accumulation in sewage sludge.
APPLIED WATER SCIENCE
(2022)
Article
Environmental Sciences
Carmen Fernandez-Lopez, Rosa Posada-Baquero, Jose Luis Garcia, Jose Carlos Castilla-Alcantara, Manuel Cantos, Jose Julio Ortega-Calvo
Summary: The study demonstrates that plants facilitate bacterial access to distant pollutant sources, possibly by increasing bacterial dispersal in the soil, which in turn promotes cometabolism and increases the risks of biodegradation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Yan-Chao Chang, Xiao-Feng Xiao, Hua-Jun Huang, Yuan-Dong Xiao, Han-Sun Fang, Jin-Bao He, Chun-Huo Zhou
Summary: The study explores the transformation characteristics of polycyclic aromatic hydrocarbons (PAHs) during hydrothermal liquefaction (HTL) of sewage sludge. It is found that the increase of reaction time favors the formation of PAHs, but there are critical values for reaction temperature and solid-liquid ratio resulting in the lowest amounts of PAHs synthesized. Most PAHs are distributed in bio-oil, and compared to raw sludge, the total/leachable contents and toxic equivalent quantity (TEQ) of PAHs in biochar are reduced, suggesting a lower environmental risk.
JOURNAL OF SUPERCRITICAL FLUIDS
(2021)
Article
Multidisciplinary Sciences
Setianto Setianto, Camellia Panatarani, Deoraj Singh, I. Made Joni
Summary: The Infrared (IR) spectra are commonly used for analyzing 3D materials, making it difficult to identify functional groups in 2D materials. This study introduces an analysis method using IR spectra to investigate 2D carbon materials like graphene. The study calculates the IR spectra of pyrene-like molecules using a semi-empirical method, allowing for the identification of functional groups and their electronic transitions in the 2D carbon materials.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Xia Wang, Ying Teng, Xiaomi Wang, Xiufen Li, Yongming Luo
Summary: Soil microbial diversity plays a crucial role in the dissipation of persistent organic pollutants. A microcosm experiment was conducted to explore the role of soil microbial diversity in the dissipation of pyrene, a high molecular weight polycyclic aromatic hydrocarbon. The results showed that soils with high microbial diversity had higher pyrene dissipation rates and higher abundances of pyrene degradation genes. Keystone taxa diversity was found to be the dominant factor determining pyrene dissipation, and diverse keystone taxa may drive pyrene dissipation through positive interactions with other species in the soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)