共查询到20条相似文献,搜索用时 703 毫秒
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表面活性剂改性岩矿材料去除废水中氯代烃的实验研究 总被引:5,自引:0,他引:5
利用天然沸石、膨润土、碱性流纹岩及英安岩等岩矿材料及其表面活性剂HDTMA Br改性产物对废水中有机氯化物的去除进行了实验研究 .结果表明 ,表面活性剂改性作用有利于增强岩矿材料对水中有机氯化物的去除作用 ,其中 ,改性膨润土去除效果最好 ,二氯甲烷、三氯甲烷、四氯化碳、三氯乙烯、四氯乙烯和氯苯的去除量分别达到 9.1,18.9,4 3.0 ,2 0 .0 ,32 .4和 30 .3μg·g-1.有机物在沉积物中的有机碳 -水分配系数Koc与岩矿材料对有机氯化物的去除量之间有较好的相关关系 . 相似文献
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利用粉煤灰处理含铜废水的实验研究 总被引:8,自引:0,他引:8
研究了粉煤灰去除废水中铜离子的速率、粉煤灰投加量对粉煤灰去除废水中铜离子的影响和粉煤灰对质量浓度不同的含铜离子废水的去除效果,进一步探讨了粉煤灰去除铜离子的机理,实验结果显示粉煤灰在去除废水中铜离子的过程中反应3 h后就达到了平衡,粉煤灰对Cu2 的去除率随粉煤灰投加量的增加而增加,但是就充分利用吸附剂粉煤灰的角度而言,并非其投加量越多去除量越大,粉煤灰吸附废水中的铜离子更符合Langmuir模型,而不是Freundlich模型;粉煤灰去除废水中的Cu2 主要是静电吸附、阳离子交换吸附和表面络合吸附作用,但是,当用碱性粉煤灰处理质量浓度较低的含Cu2 废水时,生成Cu(OH)2的沉淀作用可能占主要的地位. 相似文献
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实验以阳光照射6h为条件研究0.5‰TiO2-膨润土对水中十二烷基苯磺酸钠(SDBS)的降解过程,结果表明:阳光照射下,TiO2-膨润土复合催化剂去除水中SDBS的性能不仅优于TiO2,而且解决了TiO2颗粒细、难回收再用的问题;且在照射的同一时间段内,阳光中紫外光强度越强,SDBS的去除率越高,即使在北方冬天紫外光强度十分弱的条件下(20μW/cm2~180μW/cm2),TiO2-膨润土复合催化剂仍能6h去除51.1%的SDBS。实验中还发现以太阳光为光源,TiO2-膨润土去除模拟废水中的SDBS的最佳条件是:pH值6.00,TiO2-膨润土的投加量约为0.5‰,模拟废水的初始浓度约为20mg/L,与以紫光灯为光源时的最佳条件相近。 相似文献
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以坡缕石粘土、淀粉、水玻璃为原料,研究了固定化酶载体的制备工艺,探究了固定化酶载体在辣根过氧化酶(HRP)降解硝基酚废水中的作用,并探讨了反应时间、酶浓度、H2O2及硝基酚浓度对降解效果的影响。结果表明,固定化酶载体的最佳制备工艺为:水玻璃12%,淀粉20%,煅烧温度550℃,煅烧时间2 h;固定化酶对硝基酚的去除效果明显高于原酶;固定化酶去除水中硝基酚的最佳反应条件为:反应时间1.5 h,加酶量150 U,H2O2浓度0.12%,硝基酚浓度100 mg/L;固定化酶重复使用7次后对硝基酚的去除率仍高于60%。 相似文献
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微量As(Ⅲ)是水中较难去除的毒性物质,天然黄铁矿对水中As(Ⅲ)的去除能力低于磁黄铁矿.将黄铁矿在氮气下高温煅烧使其转变为由磁黄铁矿构成的多孔结构化材料,具有较高的比表面积和表面化学反应活性,在地下水As(Ⅲ)去除方面具有潜在的应用前景.考察了煅烧温度、煅烧时间、pH值以及溶解氧对去除水中As(Ⅲ)的影响.结果表明黄铁矿煅烧生成的单斜磁黄铁矿对As(Ⅲ)具有最佳去除效果,最佳煅烧条件为600℃煅烧1 h;在水溶液有溶解氧条件下煅烧黄铁矿去除As(Ⅲ)的适宜p H值范围较宽(4~10),而在水溶液缺少溶解氧条件下适宜pH值则变为7~10;煅烧黄铁矿在有氧水溶液中对As(Ⅲ)的吸附比缺氧水溶液中的吸附效果好. 相似文献
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新型混凝剂处理印染废水的实验研究 总被引:5,自引:0,他引:5
采用自行制各的具有不同SiO2:Al:Fe(摩尔比值)和碱化度的两类新型无机高分子混凝剂聚硅酸氯化铝铁(PSAFC)和聚硅酸硫酸铝铁(PSAFS)各7种,直接对印染废水进行处理。从中选出2种温凝剂,考察了pH值、混凝剂投量等对混凝效果的影响,并对混凝处理后,印染废水出水中残留温凝剂主要成分Al、Fe、SiO2的含量进行分析。实验结果表明,氯化物型(PSAFC)和硫酸盐型(PSAFS)混凝剂对印染废水的色度、浊度、COD Cr均有良好的去除效果;总体而言,PSAFS的混凝效果略优于PSAFC;混凝处理后印染废水出水中残留铝、铁、硅的含量均比较低;pH值和碱化度对温凝剂在水体中残留铝含量有影响。 相似文献
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水环境中的重金属污染是个普遍关注的环境问题.研究[1~4]表明,细菌、真菌和藻类都可用作有效的生物吸附剂去除水中的多种金属.生物吸附技术处理含重金属废水的主要优点是成本低、吸附效率高和可再生[5].将生物质置于海藻酸钙、聚乙烯醇等包埋剂中有利于固液分离、生物质的回收再生和应用于各种滤池.本研究主要研究海藻酸钙包埋的混合SRB菌群对Ni的生物吸附行为. 相似文献
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This paper reviews the use of Greek industrial minerals into developing low-cost, high-tech solutions to remediate parts of the chemical pollution environmental problem. The remediation strategy, based on the application and implementation of the Greek industrial minerals potential, became a major line of investigation in projects to develop new environmental technologies. Although past and current experiments have been successful on a lab scale in a number of applications, the results have not always been implemented on industrial scales. Greek olivine has been successfully tested as neutralizing agent for acid wastes, co-producing exploitable amounts of silica gel, magnesium sulphate and magnetite. Vermiculite is currently tested as an environmental ‘cleanser' in a variety of applications, i.e. metalliferous mine seepage and processing waters, organically contaminated waste water from the textile/dye industry and absorption material for oil spills. Wollastonite will be applied as long-term fertiliser and dolomite, as a substitute of asbestos in brake linings, as pollution controller of heavy metal concentrations in waste waters and as a binder to stabilize waste solids. Magnesite has been successfully applied for neutralization of acid mine wastes produced from active sulphide deposits. Zeolites (fly ash and perlite converted to zeolites were also considered) is an objective for several environmental applications, i.e. as floating absorbent for waste water ponds, as drinking water purificator or as smell abatement. 相似文献
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由于目前人类生活生产所产生的废水、污水对环境造成了严重的污染,尤其是工业废水、油田废水,对环境的威胁极其严重,污水的处理已成为人类进步与发展过程中的重要课题。本文通过选取改性剂,成功地制备出了复合硅藻土混凝剂。在对油田废水的处理中,提高了除油率。 相似文献
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A. Esmaeili E. Sadeghi 《International Journal of Environmental Science and Technology》2014,11(5):1271-1276
Among all environmental contaminations, industrial oil is one of the major pollutants of soil, water, and air. There are different chemical, physical, and biological methods to remove all types of oil pollutions. One of the common biological methods is to utilize the microorganisms like yeast, fungi or bacteria. Previous studies concerning the biodegradation of an aromatic compound in industrial waste water by Aspergillus niger have been reported. In this study, we tried to identify an oil-derived microorganism and evaluate its efficacy on self-removal of industrial oil. Firstly, the strain of isolated fungus from various bulks of used oil was defined via colonial identification and DNA sequencing. Secondly, bioremoval activity of defined fungus (Penicillium commune) was evaluated using gas chromatography–mass spectrometry. The optimum conditions in biological elimination of oil including the incubation time, pH level of culture, and amount of reagents were determined. In the best condition, a removal rate of 95.4 % was obtained. 相似文献
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基于大庆油田三元复合驱采出污水回注对地层存在的损害现象,研究了污水回注渗透率的影响因素。采用室内水驱实验方法,对三元复合驱采出污水中悬浮物、油、碱、聚合物等因素进行了分析,阐述了各种成分对渗透率的影响机理。结果表明,悬浮物颗粒会堵塞孔隙喉道,油产生的“贾敏效应”将增大油水流动阻力,碱与岩石及黏土矿物问的物理化学作用会使地层结垢,聚合物在岩芯中的吸附和滞留共同造成地层渗透率的下降。因此,建议将三元复合驱采出污水中悬浮物、油、碱、聚合物等处理合格后再进行回注,以减轻对地层的损害。 相似文献
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R. Ghanei G. Moradi A. Heydarinasab A. A. Seifkordi M. Ardjmand 《International Journal of Environmental Science and Technology》2013,10(4):847-854
Waste frying oil as valueless material which is disposed to environment can be used as a promising feedstock to produce biodiesel. In this study, constructional lime was used as alkaline heterogeneous catalyst for biodiesel production from virgin and waste frying oil. After determining the best activation temperature for the catalyst (600 °C), transesterification reactions were carried out at 65 °C, MeOH to oil molar ratio of 12:1, and 1 wt% of activated constructional lime under vigorous mixing for 5 h. Yield of reactions for virgin and waste frying oil (2.17 % free fatty acid) and pretreated waste frying oil (0.918 % free fatty acid) were 87, 93.9, and 94 %, respectively. Transesterification of virgin frying oil and pretreated waste frying oil were done at 65 °C, MeOH to oil molar ratio of 6:1, and 1 wt% of KOH as catalyst under vigorous mixing for 2 h, for comparison. Yield of the reaction was 98.6 and 95.1 %, respectively. Therefore, when constructional lime is used as catalyst pretreatment of waste oil is not necessary. 相似文献
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Assessment and mapping of the intrinsic vulnerability to pollution: an example from Keritis River Basin (Northwestern crete, Greece) 总被引:1,自引:1,他引:0
Due to the geological and hydrogeological characteristics, the carbonate aquifers are frequently vulnerable to natural and/or anthropogenic polluting sources. The aim of the present study is to evaluate the intrinsic vulnerability to pollution of the Keritis River Basin (northwestern Crete, Greece). The huge amount of the flowing groundwater represents a strategic water resource to be allocated to drinking water purpose and to agricultural activities, too. The studied groundwater are characterized by quality degradation processes represented by the anthropogenic and natural pollution such as olive oil farming, agriculture activities, industrial waste and salt water intrusion. For a better management and protection of the water resources, the assessment and mapping of groundwater vulnerability to pollution are very important. From this investigation, the Keritis Basin showed an intrinsic vulnerability degree from extremely high to very low. This study allows to define the strategies which will permit a proper safeguard criteria, against the pollution sources of the Keritis Basin groundwater resources. 相似文献