موقعك الحالي:صفحة رئيسية>المنتجات
2022-2-8 · chromium removal from contaminated soil. But. it is highly effective only when contaminant. exists within 1 m from soil surface. Chemical. chelators used
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2020-9-1 · 1. Introduction. Soil contamination by heavy metals, especially chromium, has become an increasingly serious environmental problem (Su et al., 2016a; Zhang et al., 2012a).It is well known that chromium often exists in soil in two highly stable oxidation states, trivalent (Cr(III)) and hexavalent (Cr(VI)) (Chrysochoou et al., 2012).Cr(III) species are less toxic and easily
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The Panel evaluated the dermal hazard posed by chromium-contaminated soil and acknowledged that there is a small group of persons (approximately 0.1% of the United States population) who currently have a dermal sensitization to Cr(VI) primarily through occupational exposure.
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2013-12-24 · contaminated soil samples and to determine the oxidation state of Fe, which is an element that can limit the mobility of chromium. These results will be considered in a pump and treat remediation scheme for this site. Chromium contaminated soil samples were obtained from an industrial area of Leon, Guanajuato, México.
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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
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2017-11-14 · Artificial chromium contaminated soil was used by mixing 425gram sand and chromium trichloride solution. Concentration of chromium added into the spiked soil were 50, 75, and 100 mg/L. During 14 days, pH, soil temperature and soil moisture were tested. Initial and final number of bacterial colony and chromium concentration analysed.
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2020-6-11 · Remediation of chromium contaminated soil by microbial electrochemical technology Guan-Xi Li1,2 1He-Chuan Yang2, Shuai Guo , Chao-Fan Qi1, Ke-Jing Wu1 and Fen-Fen Guo1* 1 School of Life Sciences, Qufu Normal University, Shandong 273165, China 2 Lianyungang Academy of Agricultural Sciences, Lianyungang, Jiangsu 222006, China *E-mail: guoff@qfnu ...
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2020-4-21 · Long-term disposal of tannery waste and effluent without rigorous treatment may result in severe chromium (Cr) contamination in soils. In order to reduce the toxicity of Cr in soil, rice straw was co-pyrolyzed with Cr-contaminated soil under 0.5 MPa pressure. The influences of co-pyrolysis temperature (100–300 °C) and rice straw/soil mixing ratio (0–20 wt%) on Cr
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2021-5-1 · Chromium is a natural component of the Earth's crust (Sneddon, 2012; Srivastav et al., 2018).The Earth's crust has Cr concentration >200 mg kg −1 in ultramafic (ultrabasic) rocks and ophiolite serpentinites complexes (Oze et al., 2007), which constitute an approximately 1% of the landscape of the terrestrial ecosystem, mainly within the high inhabited areas of
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2012-8-1 · Arsenic desorption from Soil 1 and 2 was conducted based on the EPA’s SPLP method 1311 and TCLP method 1312. Both desorbed only a very small amount (less than 3%) of As from Soil 1 and 2 at each depth (0–20 cm to 20–40 cm), which suggests that As is strongly sorbed to the soil. The distribution of Cr, As, Mn, Fe, Ni, and Zn in Soil 1 and ...
Read More2022-2-8 · chromium removal from contaminated soil. But. it is highly effective only when contaminant. exists within 1 m from soil surface. Chemical. chelators used
Read More2013-12-24 · contaminated soil samples and to determine the oxidation state of Fe, which is an element that can limit the mobility of chromium. These results will be considered in a pump and treat remediation scheme for this site. Chromium contaminated soil samples were obtained from an industrial area of Leon, Guanajuato, México.
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Soil leaching is an effective remediation technique using agents to leach the target pollutants from the soil. However, the dynamics and mechanisms for leaching of Cr and other non-pollutant metals from Cr-contaminated soils are not yet well understood. Here, column leaching experiments were conduct
Read More2017-11-14 · Artificial chromium contaminated soil was used by mixing 425gram sand and chromium trichloride solution. Concentration of chromium added into the spiked soil were 50, 75, and 100 mg/L. During 14 days, pH, soil temperature and soil moisture were tested. Initial and final number of bacterial colony and chromium concentration analysed.
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2021-3-25 · Microorganisms are applied to remediate chromium (Cr)-contaminated soil extensively. Nevertheless, the microbial loss and growth inhibition in the soil environment restrain the application of this technology. In this study, a Cr(VI)-reducing strain named ...
Read More2020-6-11 · Remediation of chromium contaminated soil by microbial electrochemical technology Guan-Xi Li1,2 1He-Chuan Yang2, Shuai Guo , Chao-Fan Qi1, Ke-Jing Wu1 and Fen-Fen Guo1* 1 School of Life Sciences, Qufu Normal University, Shandong 273165, China 2 Lianyungang Academy of Agricultural Sciences, Lianyungang, Jiangsu 222006, China *E-mail: guoff@qfnu ...
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2022-1-30 · These chromium-tolerant auxin-producing rhizobacteria may prove to be an efficient group of bacteria that are involved in active colonization by plant roots resulting in increase in plant growth and yield by reducing chromium toxicity in chromium contaminated areas (Feng et al., 2016). In the industrial processes, various Cr-salts are used.
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2020-10-23 · Contamination of soil by toxic chromium (Cr) is a rising health issue due to over-exploitation and industrial production. Toxicity can be decreased by bioremediation because some microorganisms are able to convert highly toxic hexavalent chromium Cr(VI) into less toxic trivalent chromium Cr(III) by secreting chromate reductase. Moreover, microorganisms are
Read More2012-8-1 · Arsenic desorption from Soil 1 and 2 was conducted based on the EPA’s SPLP method 1311 and TCLP method 1312. Both desorbed only a very small amount (less than 3%) of As from Soil 1 and 2 at each depth (0–20 cm to 20–40 cm), which suggests that As is strongly sorbed to the soil. The distribution of Cr, As, Mn, Fe, Ni, and Zn in Soil 1 and ...
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This paper reviews current progress and technologies of removal of chromium (Cr) from soil by washing with chelants. The applications of soil washing with chelants are noted;the major controlling factors in soil washing process are discussed; the mechanism of removal of Cr in soil using chelants is reviewed. Soil washing is one of the few permanent treatment alternatives to
Read More2020-6-11 · Remediation of chromium contaminated soil by microbial electrochemical technology Guan-Xi Li1,2 1He-Chuan Yang2, Shuai Guo , Chao-Fan Qi1, Ke-Jing Wu1 and Fen-Fen Guo1* 1 School of Life Sciences, Qufu Normal University, Shandong 273165, China 2 Lianyungang Academy of Agricultural Sciences, Lianyungang, Jiangsu 222006, China *E-mail: guoff@qfnu ...
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2015-10-7 · contaminated soils at varying water contents, which is essential for the evaluation of environmental risks in this region. Chromium Release from a COPR-Contaminated Soil at Varying . Water Content and Redox Conditions. Katrin Matern and Tim Mansfeldt* C. hromium (Cr) is introduced into the environment from industrial activities, including ...
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2018-6-7 · A chromium contaminated soil area was studied, in order to recover metals present as contaminants in soils, associated to the soil remediation. A leaching solution of HCl (0,1 M) and NaCl (1,9 M) was used to extract the chromium content. The concentration of chromium in the leached solutions was analysed.
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2016-7-1 · Chromium(VI) in the soil was extracted with a carbonate-hydroxide solution (0.28 M Na 2 CO 3 in 0.5 M NaOH, pH 11.8–12.3), according to James et al. (1995), and analyzed spectrophotometrically at 550 nm (Lambda 25 UV/Vis Spectrometer, Perkin-Elmer, Rodgau, Germany) with diphenylcarbazide, according to the US EPA (1992).
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2022-2-4 · Hexavalent chromium [Cr (VI)] is a contaminant of concern in many groundwater systems. Cr (VI) contamination can occur naturally (1), but most Cr (VI) contamination in water is anthropogenic ...
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2016-11-19 · Chromium contaminated soil sample were taken from Salem Steel Plant, the physicochemical analysis of this soil showed that its pH was 9.54, the electrical conductivity was 0.36 mS, while the turbidity of this soil was found to be 3.50 NTU. Mineral salts such as Iron, Copper, Manganese, Zinc, Nickel, Cobalt, Lead, Aluminum,
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2019-1-15 · In this study, the remediation of artificially chromium contaminated soil by electrokinetic process, coupled with Eggshell Inorganic Fraction Powder (EGGIF) permeable reactive barrier (PRB), was investigated. An electric field of 2 V cm −1 was applied and was used an EGGIF/soil ratio of 30 g kg −1 of contaminated soil for the preparation of ...
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2018-12-5 · Screening of chromium-tolerant auxin-producing isolates and their characterization In the present study, different soil and water samples were collected from contaminated areas of Kasur, Pakistan. MIC (minimum inhibitory concentration) of chromium salt Fatima and Ahmed (2018), PeerJ, DOI10.7717/peerj.6076 2/13
Read More2020-10-23 · Contamination of soil by toxic chromium (Cr) is a rising health issue due to over-exploitation and industrial production. Toxicity can be decreased by bioremediation because some microorganisms are able to convert highly toxic hexavalent chromium Cr(VI) into less toxic trivalent chromium Cr(III) by secreting chromate reductase. Moreover, microorganisms are
Read More2012-6-29 · Principal Components Analysis revealed that much of the variance in soil properties and chemistry between the contaminated sites was associated with pH, arsenic, total chromium, and Cr (VI) levels, while control soils were correlated with di and monovalent cations, bicarbonate, and phosphate concentrations . The pH of contaminated sites was ...
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الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.
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