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Effect of Humus on Activity of Mineral-Bound Hg: *** on leachability and Transfer of Mineral-Bound Hg Under Acid Leaching Condition

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Pedosphere 2000年第1期10卷 53-60页

作者： YAOAIJUN QINGCHANGLE 等 CollegeofGeosicence ZhongshanUniversityGuangzhou510275China CollegeofResourceandEnvironment SouthwestAgriculturalUniversityChongqing400716China

Effects of humus fractions (fulvic acid, brown humic acid and grey humic acid) on the leachability and transferring activity of five types of mineral-bound Hg were investigated. Under the acid leaching condition: fulvic acid could promote leachability and vertical transference of all the mineral-bound Hg. Brown humic acid could retard the leaching and transferring processes of CaCO3-Hg, Fe2O3-Hg, MnO2-Hg and kaolinite Hg but not bentonite-Hg. Grey humic acid could greatly enhance residing ability of the mineral-bound Hg in the soil column and restrain them from vertical transferring. The effect of humus on leachability and transferring activity on the mineral-bound Hg was closely related to its ability to convert the mineral-bound Hg into organic-bound form and the transferability of the latter in the soil column. The characteristics of the mineral-bound Hg in speciation were the internal factors that determined the extent and rate of the influence of the humus.

关键词： humus leachability mineral-bound Hg transfer

leachability of Oil Shale Ash from Isfir Al-Mahata Oil Shale, Southern Jordan

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Journal of Minerals and Materials Characterization and Engineering 2016年第5期4卷 292-303页

作者： Hani M. Alnawafleh Mohammad S. Al-Harahsheh Adnan M. Al-Harahsheh Department of Mining and Mineral Engineering Al-Hussein Bin Talal University Ma’an Jordan Department of Chemical Engineering Jordan University of Science and Technology Irbid Jordan Department of Chemical Engineering Mutah University Karak Jordan

This paper presents the first study on the oil shale (OS) ashing and OS ash leachability of Jordanian OS located further in the south. The studied OS is from Isfir Al-Mahata subsurface OS located 10 km south of Ma’an. Chemical and physical characterization of the OS ash was performed and compared with original OS. Ashing OS was conducted at different temperatures. Important parameters affecting OS ash leachability were also investigated. The leachability of certain heavy metals was investigated based on clear leaching protocol. The Fisher Assay analysis result indicates that this OS type has quite higher moisture content, lower oil content, and higher spent shale compared with other Jordanian oil shales. Ashing of OS at higher temperatures (950°C) resulted in the disappearance of silica, due to its complete reaction with lime and Al, and formation of Anhydrite and cement materials like, Portland cement. The leachability analysis indicates that for most elements the leachability is high at low pH. The released heavy metals concentrations are below EPA limits. Chromium and lead are leached out more than other elements with the exception at low pH. In general, the higher the ashing temperature is, the lower the release of elements is. The chemical composition of the ash and the leachability results suggests that it has high fixing capacity toward the heavy metals present in the ash.

关键词： Jordan Oil Shale leachability Ash Heavy Metals

Mobilities and leachabilities of heavy metals in sludge with humus soil

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Journal of Environmental Sciences 2011年第2期23卷 247-254页

作者： Rui Zhu Min Wu Jian Yang State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai 200092 China.

Chemical forms of Zn, Ni, Cu, and Pb in municipal sewage sludge were investigated by adding humus soil to sludge and by performing sequential extraction procedures. In the final sludge mixtures, Zn and Ni were mainly found in Fe/Mn oxide-bound （F3） and organic matter/sulfide-bound （F4） forms. For Zn, exchangeable （F1）, carbonate-bound （F2）, and F3 forms were transformed to F4 and residual forms （F5）. For Ni, F1 and F2 forms were transformed to F1, F2, and F3 forms. Both Cu and Pb were strongly associated with the stable forms F4 and F5. For Cu, F2 and F3 forms were major contributors, while for Pb, F3 and F4 forms were major contributors to F5. Humus soil dosage and pH conditions in the sludge were strongly correlated with the forms of heavy metals. Five forms were used to evaluate metal mobilities in the initial and final sludge mixtures. The mobilities of the four heavy metals studied decreased after 28 days. The metal mobilities in the final sludge mixtures were ranked in the following order： Ni 〉 Zn 〉 Cu = Pb. Leaching tests showed that the mobilities of Zn and Ni in lower pH conditions （pH 4） were higher than those in higher pH conditions （pH 8）.

关键词： sludge heavy metal humus soil mobility leachability

Red Cement-based Decorative Mortar Prepared with Dry Electroplating Sludge Containing Pb as Red Pigment

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Journal of Wuhan University of Technology(Materials Science) 2014年第2期29卷 291-297页

作者：李好新杨晓杰 SUO Zhi XIA Yibing HE Daihua Key Laboratory of Advanced Civil Engineering Materials Ministry of Education Tongji University Beijing Urban Transportation Infrastructure Engineering Technology Research Center Beijing University of Civil Engineering and Architecture Beijing Engineering Research Center of Architecture Functional Macromolecular Materials Beijing Building Construction Research Institute Co.Ltd School of Materials Science and Engineering University of Shanghai for Science and Technology

Red cement-based decorative mortars were prepared with different content electroplating sludge containing Pb （EPSP）, and their colors, water absorption, strengths, hydration characteristics and heavy metal leachabilities were investigated. The experimental results show that EPSP can adjust the mortar color well as the red pigments exclusively used in the decorative mortarS. EPSP will result in the increase of water absorption, but the mortar produced with 5% EPSP still has the very satisfactory water absorption. The mortars with EPSP are provided with nearly the same compressive, flexural and tensile bond strengths as those of the control. EPSP has no notable influence on the paste hydration. But it can densify the mortar microstructures. It is also evident that heavy metal concentrations in leachates of the mortars with EPSP are far lower than the recommended in the GB5085.3-2007.

关键词： eleclroplating sludge mortar color strength leachability

Performance Appraisal of Controlled Low-strength Material Using Sewage Sludge and Refuse Incineration Bottom Ash

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Chinese Journal of Chemical Engineering 2012年第1期20卷 80-88页

作者：甄广印周海燕赵天涛赵由才 The State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engi-neeringTongji University Shanghai Laogang Waste Treatment Company

This research evaluated the use of sewage sludge and refuse incineration bottom ash to replace calcium sulfoaluminate cement （CSA） in making controlled low-strength material （CLSM）. Various properties of CLSM mixtures were characterized in terms of unconfined compressive strength, microstructure and leachability. It was found that the strength of tested CLSM mixtures ranged from 3.6 to 9.0 MPa, over the upper excavatable limit of 2.1 MPa. The micro-structural analysis revealed that sewage sludge and bottom ash were crystallochemically in- corporated within CLSM system_s by forming the needle-like ettringite （C3A＇3CS＇_H32） with exiguous *** via the typical Pozzolanic Reaction, leading to a dense and low-porosity microst;＇ucture. Furthermore,-the toxicity characteristic leaching procedure evidenced that the cumulative leachable metals in the leachate were much below the regulatory thresholds. The potential for us!ng sewage sludge and bottom ash!n CLSM makin.g was thus confirmed.

关键词： dewatered siudge refuse incineration bottom ash controlled low-strength material solidification/stabilization leachability

A quantitative XANES evaluation of the TCLP applicability in phosphate-induced lead stabilization for firing range soils

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A quantitative XANES evaluation of the TCLP applicability in...