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soil remediation

Simba Tirima, Casey Bartrem, Ian von Lindern, Margrit von Braun, Douglas Lind, Shehu Mohamed Anka, Aishat Abdullahi
In 2010, an estimated 400 to 500 children died of acute lead poisoning associated with artisanal gold mining in Zamfara, Nigeria. Processing of gold ores containing up to 10% lead within residential compounds put residents, especially children, at the highest risk. Principal routes of exposure were incidental ingestion and inhalation of contaminated soil and dusts. Several Nigerian and international health organizations collaborated to reduce lead exposures through environmental remediation and medical treatment...
May 2018: Journal of Environmental Sciences (China)
Seul-Ye Lim, Hyo-Jin Kim, Seung-Hoon Yoo
Korean government has made and will continue to make a considerable investment in contaminated soil remediation to rectify the problems that arise from soil pollution. Quantitative information on the benefits of contaminated soil remediation is widely demanded by the public as well as the government. This article aims to assess the external benefits of contaminated soil remediation. A survey of 1000 randomly selected households was undertaken in Korea. The results show that the marginal willingness to pay values for a 1% decrease in human health hazard, a 1% improvement in biodiversity restoration, and 1000 new job creation by contaminated soil remediation are estimated to be KRW 204 (USD 0...
May 19, 2018: Environmental Science and Pollution Research International
Amanda Rose Shores, Brittany Hethcock, Melinda Laituri
Surface spills of water produced from hydraulic fracturing can expose soil and groundwater to organics such as BTEX and naphthalene (BTEX&N) as well as high concentrations of salt. As an alternative to soil excavation, we evaluated the effectiveness of BTEX&N soil remediation using 2 grasses present in Colorado. Perennial ryegrass and foxtail barley were grown separately in pots in the greenhouse and exposed to salt or a synthesized produced-water slurry containing relevant levels of salt and BTEX&N...
July 3, 2018: International Journal of Phytoremediation
Monika Dhote, Anil Kumar, Anjana Jajoo, Asha Juwarkar
A 90 days greenhouse experiment was conducted for evaluation of soil microbial diversity in different treatments of rhizospheric and nonrhizospheric oil sludge contaminated soil. Various pot treatments (T1-T5) were as follows: 2% oil sludge contaminated soil was considered as control (T1); augmentation of control with preadapted microbial consortium was T2; addition of Vetiver zizanioide to control was T3; bioaugmentation of control along with V. zizanioide was T4; and bioaugmentation with V. zizanioide and bulking agent was T5...
July 3, 2018: International Journal of Phytoremediation
Monu Jariyal, Vikas Jindal, Kousik Mandal, Virash Kamal Gupta, Balwinder Singh
Microbial consortia isolated from aged phorate contaminated soil were used to degrade phorate. The consortia of three microorganisms (Brevibacterium frigoritolerans, Bacillus aerophilus and Pseudomonas fulva) could degrade phorate, and the highest phorate removal (between 97.65 and 98.31%) was found in soils inoculated with mixed cultures of all the three bacterial species. However, the mixed activity of any of two of these bacteria was lower than mixed consortia of all the three bacterial species. The highest degradation by individual mixed consortia of (B...
May 14, 2018: Ecotoxicology and Environmental Safety
António Soares, Sandra Ramos, Tomás Albergaria, Cristina Delerue-Matos
The contamination of soils is a global environmental problem that urges an increased effort to recover polluted sites. In Europe, there are an estimated 20,000 polluted sites that need to be remediated and around 350,000 sites that are classified as potentially contaminated by the European Environment Agency (EEA). Remediation is a part of the solution to this problem, requiring the most innovative and sustainable technologies. In this context, the use of zero valent iron nanoparticles (nZVI) is a promising, low cost and efficient technology for the remediation of soil and groundwater contaminated with a wide range of organic and inorganic pollutants...
May 12, 2018: Science of the Total Environment
Chuan Wu, MengQian Cui, ShengGuo Xue, WaiChin Li, Liu Huang, XingXing Jiang, ZiYan Qian
Arsenic contamination in paddy soils has aroused global concern due to its threats to food security and human health. Biochar modified with different iron materials was prepared for arsenic (As) immobilization in contaminated soils. Soil incubation experiments were carried to investigate the effects of biochar modified with Fe-oxyhydroxy sulfate (Biochar-FeOS), FeCl3 (Biochar-FeCl3 ), and zero-valent iron (Biochar-Fe) on the pH, NaHCO3 -extractable As concentrations, and the As fractions in soils. The scanning electron microscope and X-ray diffraction analysis demonstrated that iron was successfully loaded onto the surface or embedded into the pores of the biochar...
May 13, 2018: Environmental Science and Pollution Research International
Hong Li, Jieyong Ou, Xuedong Wang, Zengguang Yan, Youya Zhou
The widespread use of cadmium (Cd)-containing organic fertilizers is a source of heavy metal inputs to agricultural soils in suburban areas. Therefore, the research and development of new materials and technologies for the remediation of Cd-contaminated soil is of great significance and has the potential to guarantee the safety of agricultural products and the protection of human health. We performed pot experiments to determine the potential of combined amendments of illite/smectite (I/S) clay with bone chars for the remediation of Cd-contaminated agricultural soils in a suburban area of Beijing, China...
May 12, 2018: Environmental Science and Pollution Research International
Fengxiao Zhu, Changyin Zhu, Evelyn Doyle, Hailong Liu, Dongmei Zhou, Juan Gao
Di (2‑ethylhexyl) phthalate (DEHP) is a ubiquitous organic pollutant, which has caused considerable pollution in arable soils. In this study, the relationship between DEHP degradation potential and soil properties in 12 agricultural soils (S1-S12) was examined in a microcosm based experiment. Six of these soils were then selected to monitor patterns in bacterial community responses. It was found that DEHP degradation was positively correlated with bacterial counts in the original soils, suggesting a key role for bacteria in degradation...
May 10, 2018: Science of the Total Environment
Hang Lv, Xiaosi Su, Yan Wang, Zhenxue Dai, Mingyao Liu
This study applied an integrated method for evaluating the effectiveness and mechanism of natural attenuation (NA) of petroleum-hydrocarbon contaminated groundwater. Site groundwater and soil samples were analysed to characterize spatial and temporal variations in petroleum hydrocarbons, geochemical indicators, microbial diversity and isotopes. The results showed that the area of petroleum hydrocarbon contamination plume decreased almost 60% in four years, indicating the presence of natural attenuation. The 14 C content and sequence analysis indicate that there are more relatively 'old' HCO3 - that have been produced from petroleum hydrocarbons in the upgradient portion of the contaminated plume, confirming that intrinsic biodegradation was the major factor limiting spread of the contaminated plume...
May 7, 2018: Chemosphere
Xin Yan, Jun-Wei Huang, Xi-Hui Xu, Dian Chen, Xiang-Ting Xie, Qing Tao, Jian He, Jian-Dong Jiang
The synergistic relationships between plants and their rhizospheric microbes can be used to develop a combinational bioremediation method, overcoming the constraints of individual phytoremediation or bioaugmentation method. Here, we provide a combinational transgenic plant-microbial remediation system for a more efficient removal of phenylurea herbicides (PHs) from contaminated-sites. The transgenic Arabidopsis thaliana synthesizing the bacterial N -demethylase PdmAB in the chloroplast was developed. The constructed transgenic Arabidopsis exhibited significant tolerance to isoproturon (IPU), a typical PH, and it took up the IPU through roots and transported to leaves, where the majority of the IPU was demethylated to 3-(4-isopropylphenyl)-1-methylurea (MDIPU)...
May 11, 2018: Applied and Environmental Microbiology
Ting Yang, Lei Ren, Yang Jia, Shuanghu Fan, Junhuan Wang, Jiayi Wang, Ruth Nahurira, Haisheng Wang, Yanchun Yan
Di-(2-ethylehxyl) phthalate (DEHP) is one of the most broadly representative phthalic acid esters (PAEs) used as a plasticizer in polyvinyl chloride (PVC) production, and is considered to be an endocrine-disrupting chemical. DEHP and its monoester metabolites are responsible for adverse effects on human health. An efficient DEHP-degrading bacterial strain Rhodococcus ruber YC-YT1, with super salt tolerance (0⁻12% NaCl), is the first DEHP-degrader isolated from marine plastic debris found in coastal saline seawater...
May 11, 2018: International Journal of Environmental Research and Public Health
Dejan Krčmar, Slaven Tenodi, Nenad Grba, Djurdja Kerkez, Malcolm Watson, Srdjan Rončević, Božo Dalmacija
Most regional municipal solid waste landfills in Serbia are operated without control of landfill leachate and gas or with no regard for implementation of national and European legislation. For the first time in Serbia, groundwater and soil at a landfill were subject to systematic annual monitoring according to national, European legislation and adopted methodologies. Characterisation of the groundwater and soil samples from the landfill included ten metals (Fe, Mn, As, Zn, Cd, Pb, Ni, Cr, Cu and Hg), 16 EPA PAHs, nutrients and certain physicochemical parameters, in order to assess the risks such poorly controlled landfills pose to the environment...
February 15, 2018: Science of the Total Environment
Ali Ebadi, Nayer Azam Khoshkholgh Sima, Mohsen Olamaee, Maryam Hashemi, Reza Ghorbani Nasrabadi
The negative impact of salinity on plant growth and the survival of rhizosphere biota complicates the application of bioremediation to crude oil-contaminated saline soils. Here, a comparison was made between the remedial effect of treating the soil with Pseudomonas aeruginosa, a salinity tolerant hydrocarbon-degrading consortium in conjunction with either the halophyte Salicornia persica or the non-halophyte Festuca arundinacea. The effect of the various treatments on salinized soils was measured by assessing the extent of total petroleum hydrocarbon (TPH) degradation, the soil's dehydrogenase activity, the abundance of the bacteria and the level of phytotoxicity as measured by a bioassay...
May 8, 2018: Journal of Environmental Management
Yimei Zhang, Shuai Li, Zhuang Chen, Fei Wang, Jie Chen, Liqun Wang
In China, potential heavy metal hazard around abandoned lead-acid battery plant (ALBP) area has been a great concern but without detailed report. The distribution and sources of heavy metals in soils and so by risk assessment associated with ALBP are conducted in this contribution, based on geographies and statistics. Pb and Zn are quantitively identified to be still emitted from ALBP soil, and Cd as well As are from agricultural activity. We investigate vertical metal distribution, and fortunately find that metals migrate within limit of 40 cm below topsoil, which is higher than groundwater table...
April 23, 2018: Journal of Hazardous Materials
Gautier Landrot, Saengdao Khaokaew
Lead (Pb) stabilization in polluted soils treated by a Pb immobilization technique may be dependent on the speciation of Pb present in specific particle-size fractions of the soil. However, the scale-dependency of Pb speciation in contaminated soils is still not clearly understood. In this study, the natures and amounts of Pb chemical forms were determined in five Pb-polluted soil samples from Klity Village, Thailand, and their particle-size fractions. This was achieved using multiple analytical tools, including bulk Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy at the Pb LIII edge...
May 11, 2018: Environmental Science & Technology
Kassim O Badmus, Elizabeth Coetsee-Hugo, Hendrik Swart, Leslie Petrik
Nano zero valent iron (nZVI) is an excellent adsorbent/reductant with wide applicability in remediation of persistent contaminants in soil, water and groundwater aquifers. There are concerns about its environmental fate, agglomeration, toxicity and stability in the air. Several modification methods have applied chistosan, green tea, carboxyl methyl cellulose and other coating substances to ensure production of nZVI with excellent air stability and effectiveness. The synthesis of a novel green nZVI (gNZVI) with Harpephyllum caffrum leaf extracts was successfully executed in the current study...
May 10, 2018: Environmental Science and Pollution Research International
Lina Lin, Shiwei Zhou, Qing Huang, Yongchun Huang, Weiwen Qiu, Zhengguo Song
Two ferromanganese oxide-biochar composites (FMBC1 and FMBC2 ) were prepared by an impregnation method to promote the adsorption of As on red soil. Maximum adsorption capacities (Q m ) of 0.687 and 0.712 mg g-1 were observed for FMBC1 and FMBC2 , respectively, corresponding to increases of 104 and 111% relative to the control treatment (Q m  = 0.337 mg g-1 ). Treatment with FMBC1 increased the pH of red soil, whereas a reverse trend was observed for FMBC2 . A variety of analytical techniques were used to explain the differences between FMBC1 and FMBC2 , revealing that the oxidation of As(III) to As(V) by Mn and Fe oxides was aided by interactions with the oxygen-containing functional groups of the ferromanganese oxide-biochar composites...
May 10, 2018: Environmental Science and Pollution Research International
Congcong Cao, Li Wang, Hairong Li, Binggan Wei, Linsheng Yang
Metal contamination in soil from tailings induces risks for the ecosystem and for humans. In this study, the concentrations and ecological risks of Cd, Cu, Pb, and Zn in soil contaminated by a tailing from Yangshuo (YS) lead and zinc (Pb⁻Zn) mine, which collapsed for more than 40 years, were determined in 2015. The mean concentrations of Zn, Pb, Cu, and Cd were 1301.79, 768.41, 82.60, and 4.82 mg/kg, respectively, which, with years of remediation activities, decreased by 66.9%, 61.7%, 65.4%, and 65.3% since 1986, but still exceed the national standards...
May 9, 2018: International Journal of Environmental Research and Public Health
Adam Varley, Andrew Tyler, Yuri Bondar, Ali Hosseini, Viachaslau Zabrotski, Mark Dowdall
Cs-137 is considered to be the most significant anthropogenic contributor to human dose and presents a particularly difficult remediation challenge after a dispersal following nuclear incident. The Chernobyl Nuclear Power Plant meltdown in April 1986 represents the largest nuclear accident in history and released over 80 PBq of 137 Cs into the environment. As a result, much of the land in close proximity to Chernobyl, which includes the Polessie State Radioecology Reserve in Belarus, remains highly contaminated with 137 Cs to such an extent they remain uninhabitable...
May 5, 2018: Environmental Pollution
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