共查询到17条相似文献,搜索用时 125 毫秒
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用铬渣生产水泥消除铬消毒性的研究 总被引:1,自引:0,他引:1
本文提出了一种通过以粉煤灰(或煤矸石),石灰石,铬渣,A渣为原料煅炼新型低温水泥的方法去除儿渣毒性,进行了去除铬渣毒性稳定性试验,讨论了除铬渣毒性的机理和影响去除铬渣毒性的因素,试验结果表明,该法去除铬渣毒性彻底,社会效益及经济效益显著,是处理铬渣的一种有效方法。 相似文献
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最近新闻报道,2005年,国家发.改委与国家环保总局联合出台的《铬渣污染综合整治方案》显示,截至当时,19个省、自治区和直辖市累计产生铬渣600万吨,其中只有200万吨得到处理,其余400万吨铬渣处于堆放状态。然而,方案没能治住超标,不仅是铬,各大重金属污染已是屡禁不止。 相似文献
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通过对国内典型铬渣处理的项目进行分析,并结合某铬渣污染治理工程实例,从反应机理、解毒工艺、工艺适应性、资源回收利用、设备选型、处理规模、场址选择、污染控制及安全生产和经济性方面对铬渣湿法解毒和干法解毒技术在实际应用中的选择进行对比,为该项目提出了更适合的解毒技术。 相似文献
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前不久,云南曲靖铬污染事件被披露,引起全国广泛关注。8月16日,云南省环保厅要求肇事企业陆良化工实业有限公司在停产整治期间,必须完成老铬渣库和现厂内渣库堆存的全部铬渣的无害化处理,未经曲靖市环保局验收,不得恢复生产。 相似文献
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采用微波消解-光度法处理钻井液废水中的总铬。该方法克服了常规消解方法的缺点,测定步骤简单、快速,准确性高。通过实验探讨了微波功率、加热时间、样品体积对样品消解的影响。与常压的硫酸-硝酸消解法进行比较的结果表明,用微波消解-光度法处理泥浆废水可将消解时间由原来的6h缩短为20min,加标回收率由60%提高到92%,降低了工作强度,改善了工作环境。 相似文献
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环境中铬污染的生态效应及其防治 总被引:14,自引:0,他引:14
从生态效应的角度介绍了重金属铬在环境中的迁移、转化规律,重点论及了铬污染对人体健康厦水生生物等其他生物的影响、对水体自净作用的影响,指出Cr^6+的生态效应远比Cr^3+大的多。目前治理含铬工业废水和受铬污染土壤几种有效方法,旨在引起人们对环境中铬污染的生态效应产生足够的重视和防范。 相似文献
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苎麻脱胶废水预处理研究 总被引:1,自引:0,他引:1
通过采用自制的苎麻脱胶废水混凝剂、去杂脱色剂对苎麻脱胶废水进行预处理,实现了苎麻脱胶废水COD(mg/L)、BOD(mg/L)、SS(mg/L)下降到生化处理的要求,为废水生化处理打下基础。通过微波处理废水滤渣,使其达到快速干燥、炭化,并能作为自制脱色剂组成成分之一,实现了滤渣的资源化利用并降低了废水的处理成本。 相似文献
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The term “phytoremediation” is used to describe the cleanup of heavy metals from contaminated sites by plants. This study
demonstrates phytoremediation potential of Indian mustard (Brasicca juncea (L.) Czern. & Coss.) genotypes for chromium (Cr). Seedlings of 10 genotypes were grown hydroponically in artificially contaminated
water over a range of environmentally relevant concentrations of Cr (VI), and the responses of genotypes in the presence of
Cr, with reference to Cr accumulation, its phytotoxity and anti-oxidative system were investigated. The Cr accumulation potential
varied largely among Indian mustard genotypes. At 100 μM Cr treatment, Pusa Jai Kisan accumulated the maximum amount of Cr
(1680 μg Cr g−1 DW) whereas Vardhan accumulated the minimum (107 μg Cr g−1 DW). As the tolerance of metals is a key plant characteristic required for phytoremediation purpose, effects of various levels
of Cr on biomass were evaluated as the gross effect. The extent of oxidative stress caused by Cr stress was measured as rate
of lipid peroxidation. The level of thiobarbituric acid reactive substances (TBARS) was enhanced at all Cr treatments when
compared to the control. Inductions of enzymatic and nonenzymatic antioxidants were monitored as metal-detoxifying responses.
All the genotypes responded to Cr-induced oxidative stress by modulating nonenzymatic antioxidants [glutathione (GSH) and
ascorbate (Asc)] and enzymatic antioxidants [superoxide dismutase (SOD), ascorbate peroxidase (APX), and glutathione reductase
(GR)]. The level of induction, however, differed among the genotypes, being at its maximum in Pusa Jai Kisan and its minimum
in Vardhan. Pusa Jai Kisan was grown under natural field conditions with various Cr treatments, and Cr-accumulation capacity
was studied. The results confirmed that Pusa Jai Kisan is a hyperaccumulator of Cr and hypertolerant to Cr-induced stress,
which makes this genotype a viable candidate for use in the development of phytoremediation technology of Cr-contaminated
sites. 相似文献
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Adsorption of arsenic and chromium by mixed magnetite and maghemite nanoparticles from aqueous solution is a promising technology. In the present batch experimental study, a commercially grade nano-size ‘magnetite’, later identified in laboratory characterization to be mixed magnetite–maghemite nanoparticles, was used in the uptake of arsenic and chromium from different water samples. The intent was to identify or develop a practical method for future groundwater remediation. The results of the study showed 96–99% arsenic and chromium uptake under controlled pH conditions. The maximum arsenic adsorption occurred at pH 2 with values of 3.69 mg/g for arsenic(III) and 3.71 mg/g for arsenic(V) when the initial concentration was kept at 1.5 mg/L for both arsenic species, while chromium(VI) concentration was 2.4 mg/g at pH 2 with an initial chromium(VI) concentration of 1 mg/L. Thus magnetite–maghemite nanoparticles can readily adsorb arsenic and chromium in an acidic pH range. Redox potential and pH data helped to infer possible dominating species and oxidation states of arsenic and chromium in solution. The results also showed the limitation of arsenic and chromium uptake by the nano-size magnetite–maghemite mixture in the presence of a competing anion such as phosphate. At a fixed adsorbent concentration of 0.4 g/L, arsenic and chromium uptake decreased with increasing phosphate concentration. Nano-size magnetite–maghemite mixed particles adsorbed less than 50% arsenic from synthetic water containing more than 3 mg/L phosphate and 1.2 mg/L of initial arsenic concentration, and less than 50% chromium from synthetic water containing more than 5 mg/L phosphate and 1.0 mg/L of chromium(VI). In natural groundwater containing more than 5 mg/L phosphate and 1.13 mg/L of arsenic, less than 60% arsenic uptake was achieved. In this case, it is anticipated that an optimum design with magnetite–maghemite nanoparticles may achieve high arsenic uptake in field applications. 相似文献