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https://www.readbyqxmd.com/read/28725525/microbial-degradation-of-petrochemical-waste-polycyclic-aromatic-hydrocarbons
#1
M H Fulekar
BACKGROUND: Petrochemical industry is one of the fastest growing industries. This industry has immense importance in the growth of economy and manufacture of large varieties of chemicals. The petrochemical industry is a hazardous group of industry generating hazardous waste containing organic and inorganic compounds. In spite of the present treatment process, the hazardous waste compounds are found untreated to the acceptable level and found discharged at soil-water environment resulting into the persistent organic-inorganic pollutant into the environment...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28721622/influence-of-selected-cyclodextrins-in-sorption-desorption-of-chlorpyrifos-chlorothalonil-diazinon-and-their-main-degradation-products-on-different-soils
#2
María E Báez, Jeannette Espinoza, Ricardo Silva, Edwar Fuentes
Cyclodextrins (CDs) can improve the apparent solubility and bioavailability of a variety of organic compounds through the formation of inclusion complexes; accordingly, they are suitable for application in innovative remediation technologies of contaminated soils. However, the different interactions in the tertiary system CD/contaminant/soil matrix can affect the bioavailability of the inclusion complex through the possible sorption of CD and CD complex in the soil matrix, as well as with the potential of the sorbed CD to form the complex, concurrent with the desorption processes...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28721619/measurements-of-%C3%AE-and-%C3%AE-hexachlorocyclohexane-in-juglans-regia-and-prunus-spinosa-trees-in-a-contaminated-area-central-italy
#3
Sabrina Battisti, Carlo Boselli, Alessandro Ubaldi, Cristina Roffi Isabelli, Tabita Mauti, Ugo Della Marta, Paola Scaramozzino
Vegetables play an important role in the human diet, and the transfer of toxic contaminants from the soil to plants has been little studied for most tree species and their edible portions. In an area affected by hexachlorocyclohexane (HCH) contamination, in the Sacco River Valley (central Italy), measurements of β- and α-HCH isomers were made on different parts of two tree species: Juglans regia and Prunus spinosa. Concentrations were analysed in roots, branches, leaves, fruits, and seeds. A spatial evaluation of the results highlighted an inverse association of contamination with distance from the river, which is the main route of transport in the environment...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28721038/toxicity-based-toxicokinetic-toxicodynamic-assessment-of-bioaccumulation-and-nanotoxicity-of-zerovalent-iron-nanoparticles-in-caenorhabditis-elegans
#4
Ying-Fei Yang, Yi-Jun Lin, Chung-Min Liao
Elucidating the relationships between the toxicity-based-toxicokinetic (TBTK)/toxicodynamic (TD) properties of engineered nanomaterials and their nanotoxicity is crucial for human health-risk analysis. Zerovalent iron (Fe(0)) nanoparticles (NPs) are one of the most prominent NPs applied in remediating contaminated soils and groundwater. However, there are concerns that Fe(0)NP application contributes to long-term environmental and human health impacts. The nematode Caenorhabditis elegans is a surrogate in vivo model that has been successfully applied to assess the potential nanotoxicity of these nanomaterials...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28717650/removal-of-cu-zn-pb-and-cr-from-yangtze-estuary-using-the-phragmites-australis-artificial-floating-wetlands
#5
Xiaofeng Huang, Feng Zhao, Gao Yu, Chao Song, Zhi Geng, Ping Zhuang
Contamination of heavy metals would threaten the water and soil resources; phytoremediation can be potentially used to remediate metal contaminated sites. We constructed the Phragmites australis artificial floating wetlands outside the Qingcaosha Reservoir in the Yangtze Estuary. Water characteristic variables were measured in situ by using YSI Professional Pro Meter. Four heavy metals (copper, zinc, lead, and chromium) in both water and plant tissues were determined. Four heavy metals in estuary water were as follows: 0...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28715761/effects-of-lead-mineralogy-on-soil-washing-enhanced-by-ferric-salts-as-extracting-and-oxidizing-agents
#6
Jong-Chan Yoo, Sang-Min Park, Geun-Seok Yoon, Daniel C W Tsang, Kitae Baek
In this study, we evaluated the feasibility of using ferric salts including FeCl3 and Fe(NO3)3 as extracting and oxidizing agents for a soil washing process to remediate Pb-contaminated soils. We treated various Pb minerals including PbO, PbCO3, Pb3(CO3)2(OH)2, PbSO4, PbS, and Pb5(PO4)3(OH) using ferric salts, and compared our results with those obtained using common washing agents of HCl, HNO3, disodium-ethylenediaminetetra-acetic acid (Na2-EDTA), and citric acid. The use of 50 mM Fe(NO3)3 extracted significantly more Pb (above 96% extraction) from Pb minerals except PbSO4 (below 55% extraction) compared to the other washing agents...
July 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28715703/removal-mechanisms-in-aerobic-slurry-bioreactors-for-remediation-of-soils-and-sediments-polluted-with-hydrophobic-organic-compounds-an-overview
#7
REVIEW
Douglas O Pino-Herrera, Yoan Pechaud, David Huguenot, Giovanni Esposito, Eric D van Hullebusch, Mehmet A Oturan
Hydrophobic organic compound (HOC)-contaminated soils are a great environmental and public health concern nowadays. Further research is necessary to develop environmental friendly biotechnologies that allows public and private sectors to implement efficient and adaptable treatment approaches. Aerobic soil-slurry bioreactor technology has emerged as an effective and feasible technique with a high remediation potential, especially for silt and clay soil fractions, which often contain the highest pollutant concentration levels and are usually difficult to remove by implementing conventional methods...
June 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28712780/a-review-of-biochar-based-catalysts-for-chemical-synthesis-biofuel-production-and-pollution-control
#8
REVIEW
Xinni Xiong, Iris K M Yu, Leichang Cao, Daniel C W Tsang, Shicheng Zhang, Yong Sik Ok
This review addresses the use of biochar as a green and versatile catalyst support for emerging high-end applications beyond soil remediation, including chemical synthesis and biodiesel production from biomass, and pollutant degradation in the environment. Their catalytic performances are comparable or even superior to the conventional resin-, silica-, or carbon-based catalysts, owing to the favourable intrinsic features of biochar (various functional groups, intricate network of structures, etc.). Yet, distinctive active sites are needed for different applications...
July 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28712076/nickel-stressed-responses-of-rice-in-ni-subcellular-distribution-antioxidant-production-and-osmolyte-accumulation
#9
Muhammad Rizwan, Muhammad Imtiaz, Zhihua Dai, Sajid Mehmood, Muhammad Adeel, Jinchang Liu, Shuxin Tu
Nickel has been found a key pollutant in farmlands of central and south China, and understanding of Ni toxicity in rice is of great significance in safety production of rice and remediation of Ni polluted paddy soils. The present study aimed to investigate the uptake and subcellular distribution of Ni, antioxidant production, and osmolyte accumulation of rice (Oryza sativa L., cv. yangliangyou 6) plants exposed to excessive Ni concentrations to gain an insight into Ni-induced phytotoxicity. Results revealed that exposure of rice seedlings to high Ni concentrations resulted a decline in root and shoot lengths and fresh weight (FW) and dry weight (DW) of rice plants, which are in connection with the depletion of the contents of photosynthetic pigments...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28711820/integrated-metagenomics-and-molecular-ecological-network-analysis-of-bacterial-community-composition-during-the-phytoremediation-of-cadmium-contaminated-soils-by-bioenergy-crops
#10
Zhaojin Chen, Yuan Zheng, Chuanyu Ding, Xuemin Ren, Jian Yuan, Feng Sun, Yuying Li
Two energy crops (maize and soybean) were used in the remediation of cadmium-contaminated soils. These crops were used because they are fast growing, have a large biomass and are good sources for bioenergy production. The total accumulation of cadmium in maize and soybean plants was 393.01 and 263.24μg pot(-1), respectively. The rhizosphere bacterial community composition was studied by MiSeq sequencing. Phylogenetic analysis was performed using 16S rRNA gene sequences. The rhizosphere bacteria were divided into 33 major phylogenetic groups according to phyla...
July 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28710950/citric-acid-assisted-phytoextraction-of-chromium-by-sunflower-morpho-physiological-and-biochemical-alterations-in-plants
#11
Mujahid Farid, Shafaqat Ali, Muhammad Rizwan, Qasim Ali, Farhat Abbas, Syed Asad Hussain Bukhari, Rashid Saeed, Longhua Wu
Soil and water contamination from heavy metals and metalloids is one of the most discussed and burning global issues due to its potential to cause the scarcity of healthy food and safe water. The scientific community is proposing a range of lab and field based physical, chemical and biological solutions to remedy metals and metalloids contaminated soils and water. The present study finds out a possibility of Chromium (Cr) extraction by sunflower from spiked soil under chelating role of citric acid (CA). The sunflower plants were grown under different concentrations of Cr (0, 5, 10 & 20mgkg(-1)) and CA (0, 2...
July 12, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28710730/remediation-of-chromium-contaminated-soil-by-electrokinetics-and-electrokinetics-coupled-with-caal-ldh-permeable-reaction-barrier
#12
Yunfeng Xu, Wei Xia, Hetian Hou, Jia Zhang, Guangren Qian
The remediation of Cr(VI)-contaminated soil was investigated by electrokinetic (EK) and permeable-reactive-barrier assisted electrokinetic (EK-PRB). The medium of PRB was hydrocalumite (CaAl-LDH). The results showed that removal efficiency of hexavalent chromium (Cr(VI)) in EK-PRB and EK system was 96.49 and 85.50%, respectively. Simultaneously, the removal efficiency of total chromium (TCr) was 69.34 and 40.97% after 120-h treatment. The XRD, FTIR, and XPS analyses indicated that the reactive barrier media of CaAl-LDH successfully captured the chromium...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28709053/transport-and-retention-of-biochar-nanoparticles-in-a-paddy-soil-under-environmentally-relevant-solution-chemistry-conditions
#13
Ming Chen, Dengjun Wang, Fan Yang, Xiaoyun Xu, Nan Xu, Xinde Cao
Land application of biochar has been increasingly recommended as a powerful strategy for carbon sequestration and soil remediation. However, the biochar particles, especially those in the nanoscale range, may migrate or carry the inherent contaminants along the soil profile, posing a potential risk to the groundwater. This study investigated the transport and retention of wood chip-derived biochar nanoparticles (NPs) in water-saturated columns packed with a paddy soil. The environmentally-relevant soil solution chemistry including ionic strength (0...
July 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28709043/improvement-effects-of-cytokinin-on-edta-assisted-phytoremediation-and-the-associated-environmental-risks
#14
Jie Luo, Limei Cai, Shihua Qi, Jian Wu, X W Sophie Gu
Soil samples containing excess Cd (0.82 mg kg(-1)), Pb (92.7 mg kg(-1)) and Cu (72.7 mg kg(-1)) relative to their corresponding safe thresholds (0.3, 80 and 50 mg kg(-1), respectively) from a notorious e-waste disposing and recycling place in southern China were phytoremediated with EDTA addition to evaluate the promotion effects of cytokinin on the remediation efficiency of Eucalyptus globulus. Biomass production of the plant, evapotranspiration amount of the soil, metals accumulation in plant organs and the volume of leachate under various treatments were compared...
July 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28708308/arsenic-resistant-and-plant-growth-promoting-firmicutes-and-%C3%AE-proteobacteria-species-from-industrially-polluted-irrigation-water-and-corresponding-cropland
#15
Nayab Qamar, Yasir Rehman, Shahida Hasnain
AIMS: The aim of the study was to explore irrigation water polluted with industrial waste and corresponding cropland to screen bacteria for As-detoxification and plant growth promotion. METHODS AND RESULTS: Plant growth promoting As-resistant cropland bacteria were isolated from contaminated irrigation water and corresponding agricultural soil. Phylogenetic analysis revealed that the isolates belonged to 2 distinct bacterial lineages; Firmicutes and γ-Proteobacteria...
July 14, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28702916/risk-assessment-of-heavy-metals-in-soil-of-tongnan-district-southwest-china-evidence-from-multiple-indices-with-high-spatial-resolution-sampling
#16
Yongmei Ma, Zhongmin Jia, Siyue Li
Assessment of heavy metal (HM) pollution in soil is critical for human health, ecological remediation, and soil conservation. In this study, statistical analyses and geochemical approaches such as enrichment factor (EF), the index of geoaccumulation (Igeo), and potential ecological risk index (RI) were used for characterization and risk assessment of soil HMs through a high-spatial-resolution 385 samples from Tongnan District, an important agricultural practice area in Chongqing Municipality in Southwest China...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28702904/formation-of-brominated-and-chlorinated-dioxins-and-its-prevention-during-a-pilot-test-of-mechanochemical-treatment-of-pcb-and-pbde-contaminated-soil
#17
Mengnan Lu, Tianwu Lv, Ying Li, Zheng Peng, Giovanni Cagnetta, Shouxiang Sheng, Jun Huang, Gang Yu, Roland Weber
The destruction of persistent organic pollutants (POPs) is a large challenge in particular in developing and emerging economies. To date, a detailed assessment of non-combustion technologies with respect to formation of dioxins is lacking. In this study, an assessment of mechanochemical (MC) destruction technology for polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in contaminated soil remediation was conducted. Actual applied conditions of pilot-scale MC POPs destruction process indicates that the temperature increase inside the ball mills has the potential to form high levels of toxic polybrominated and polychlorinated dibenzo-p-dioxins and dibenzofurans (PXDD/Fs) when dioxin precursors are present...
July 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28699022/colonization-of-plant-roots-and-enhanced-atrazine-degradation-by-a-strain-of-arthrobacter-ureafaciens
#18
Dmitry P Bazhanov, Kai Yang, Hongmei Li, Chengyun Li, Jishun Li, Xiangfeng Chen, Hetong Yang
Our previous research found that culturable atrazine degraders associated with maize roots were dominated by genetically similar strains of Arthrobacter ureafaciens, suggesting their rhizosphere competence. The present study aimed to assess the root-colonizing capacity of strain A. ureafaciens DnL1-1 and to evaluate consequent root-associated degradation of atrazine. A soil-sand assay and pot experiments provided evidence that A. ureafaciens DnL1-1 competitively colonized roots of maize, wheat, and alfalfa following seed inoculation...
July 12, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28699006/adsorption-and-mineralization-of-ree-lanthanum-onto-bacterial-cell-surface
#19
Yangjian Cheng, Li Zhang, Xiaojing Bian, Hongyang Zuo, Hailiang Dong
A large number of rare earth element mining and application resulted in a series of problems of soil and water pollution. Environmental remediation of these REE-contaminated sites has become a top priority. This paper explores the use of Bacillus licheniformis to adsorb lanthanum and subsequent mineralization process in contaminated water. The maximum adsorption capacity of lanthanum on bacteria was 113.98 mg/g (dry weight) biomass. X-ray diffraction (XRD) and transmission electron microscopy (TEM) data indicated that adsorbed lanthanum on bacterial cell surface occurred in an amorphous form at the initial stage...
July 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28697428/temporal-and-spatial-variation-of-polychlorinated-biphenyls-pcbs-contamination-in-environmental-compartments-of-highly-polluted-area-in-central-russia
#20
Natalia Malina, Elena A Mazlova
This study highlights the fact that serious contamination from polychlorinated biphenyls (PCBs) still exists in Serpukhov City (Russia). The research help to determine the temporal (16- and 24-year periods) and spatial PCBs distribution in the environmental compartments of the studied region. Samples of soil, sediments, water and plants were analysed in order to establish their contamination levels. The most recent data on the Serpukhov City's soil contamination showed that the PCBs concentrations varies from 0...
July 2, 2017: Chemosphere
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