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61.
62.
水处理剂的绿色化及其在印染废水中的应用研究 总被引:1,自引:0,他引:1
印染废水存在污染重、处理难等污染特征,对水环境的生态安全造成严重影响和潜在威胁,使其成为污废水治理研究的重点领域.不同水处理剂的处理效果差异大,通过对比传统水处理剂与绿色水处理剂的技术参数,绿色水处理剂体现了处理高效、环境友好、功能多元的技术优势.同时对绿色水处理剂在印染废水处理中的应用状况进行了评价,分析了关于绿色水处理剂的研发、应用过程中的问题与不足,并对未来绿色水处理剂的研究发展方向进行了展望. 相似文献
63.
64.
Enhanced multi-metal extraction with EDDS of deficient and excess dosages under the influence of dissolved and soil organic matter 总被引:2,自引:0,他引:2
This study investigated the influence of dissolved and soil organic matter on metal extraction from an artificially contaminated soil. With high concentration of DOM, the extraction of Cu, Zn and Pb was enhanced by forming additional metal-EDDS complexes under EDDS deficiency. However, the enhancement of metal extraction under EDDS excess was probably due to the soil structure being disrupted owing to humic acid enhanced Al and Fe dissolution, which induced more metals dissolving from the soils. Fulvic acid was found to enhance metal extraction to a greater extent compared with humic acid because of its high content of the carboxylic functional group. Cu extraction from the soil with high organic matter content using EDDS was the lowest due to the high binding affinity of Cu to SOM, whereas Zn extraction became the highest because of a preference for EDDS to extract Zn due to the high stability constant of ZnEDDS. 相似文献
65.
Removal of metal ions from the complexed solutions in fixed bed using a strong-acid ion exchange resin 总被引:4,自引:0,他引:4
Fixed bed removal of equimolar metal ions (Co2+, Ni2+, Mn2+, Sr2+) from aqueous solutions using a strong-acid resin was examined. The solution contained a water-soluble complexing agent including ethylenediaminetetraacetic acid, nitrilotriacetic acid, and citric acid. Experiments were performed under different solution pH and molar concentration ratios of complexing agent to the total metals. It was shown from batch studies that the equilibrium exchange of metals and the resin mainly depended on solution pH, and partly on the type of complexing agent used. A mass transfer model was proposed to describe the breakthrough curves of the resin bed, which contained two parameters (τ and k) estimated from the observed breakthrough data. The calculated breakthrough curves agreed well with the measured ones (standard deviation <6%). In fixed bed tests at low pH (=2), the type of complexing agent had little effect on the breakthrough data. For a given complexing agent, the metal with a larger overall formation constant (Kf) showed a smaller exchange capacity. For a given metal ion, the complexing agent with a larger Kf also revealed a smaller exchange capacity. 相似文献
66.
滇池草海蓝藻清除应急药剂筛选现场试验研究 总被引:12,自引:0,他引:12
在滇池草海开展的蓝灌清除应急措施药剂筛选试验中,对国内外14种药剂进行了试验研究,综合净水效果、安全性、经济性和可操作性等几方面因素,从中优选出3种微生物制剂、1种混凝剂和2种杀藻剂,为实施蓝灌清除应急措施提供了重要技术依据。 相似文献
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68.
化学药剂抑尘方法的工业应用 总被引:1,自引:0,他引:1
论述了化学药剂抑尘方法的工业应用,大量的试验测试数据表明:该除尘方法投资省、运营费用低、除尘效果好、简单易操作。 相似文献
69.
采用3种铁基吸附剂(FeSO4•7H2O、针铁矿、Fe0)和铝基吸附剂(Al(OH)3),对某起爆药污染场地土壤中锑(Sb)进行稳定化处理,通过等温吸附实验、批量浸出实验、比表面积测定以及BCR分析,研究了铁、铝单一和混合吸附剂的稳定化效果以及稳定化前后土壤比表面积及Sb形态的变化.结果表明:不同铁基吸附剂对Sb的等温吸附符合Freundlich模型,FeSO4 (log Kf= 5.85)的吸附能力明显高于Fe0 (log Kf = 3.21)和针铁矿(log Kf = 4.32);稳定时间为10d的条件下,不同铁基吸附剂对Sb的稳定化效率随添加量的增大而提高,且10%FeSO4(97.1%) > 10% Fe0(72.3%) > 针铁矿(41.0%);FeSO4的添加明显促进了土壤中Zn、Cu、Pb的浸出,达到原土壤浸出浓度的1990.2、2.8倍和21.6倍,添加Al(OH)3后能够显著降低Zn、Cu、Pb的浸出浓度,添加量为4%时,稳定化效率分别达到93.8%(Zn)、93.5%(Cu)和98.3%(Pb);5%FeSO4和4% Al(OH)3混合吸附剂对Sb及Zn、Cu、Pb的综合稳定化效率最好,处理10d后稳定化效率最高可达94.6%、74.2%、82.2%和97.6%;进一步分析表明,混合吸附剂添加后比表面积能够达到原土壤的1.31~1.67倍,残渣态Sb比例增加0.037~0.197倍,与稳定化效果相一致,表明铁铝混合吸附剂是处理起爆药污染场地复合重金属污染土壤的有效途径. 相似文献
70.
Gulnara M. Shaydullina Natalya A. Sinikova Albert T. Lebedev 《Environmental Chemistry Letters》2005,3(1):1-5
Ozone, chlorine and sodium hypochlorite are commonly used as disinfecting agents for drinking water production. The reaction pathways of ozonation and chlorination of o-methoxybenzoic acid in aqueous solution were studied using gas chromatography-mass spectrometry (GC-MS) and high pressure liquid chromatography (HPLC). The results show that less than 1% of o-methoxybenzoic acid remains in reaction. The final major products using ozone oxidation are oxalic and glyoxalic acids. Phenols appear only at insufficient ozone levels. Sodium hypochlorite leads to higher levels of primary products. Molecular chlorine leads to the formation of higher amounts of polychlorinated derivatives. Model experiments allow to propose schemes of o-methoxybenzoic acid transformation under the conditions simulating water treatment processes. 相似文献