共查询到20条相似文献,搜索用时 140 毫秒
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传统除铁锰的方法是一级除铁、二级除锰。采用接触氧化一药剂氧化法。利用陶粒-锰砂双层滤料滤池可同时去除铁和锰,即通过一级曝气、药剂氧化和过滤即可同时去除铁和锰。简化了传统的二级曝气、过滤的长流程设计。除铁除锰滤料无需成熟期,无需除锰前处理,可直接生产应用。 相似文献
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当地下水中铁、锰含量超过标准时应进行除铁、锰处理,通常除铁容易而除锰较难。国内采用曝气接触氧化法除锰。地下水曝气后进行过滤,在滤料表面自然形成一层高价锰氧化物的锰质滤膜,此滤膜是一种催化剂,在除锰过程中起主要作用。即使在低pH值条件下也能使低价锰氧化为高价锰而过滤除 相似文献
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以江苏某地区温泉度假村项目中温泉水为水源,通过处理工艺去除温泉水中铁锰等杂质,达到温泉用水标准。调试结果表明,对于铁锰含量高的高温水,曝气方式除铁锰效果不明显,需通过控制滤速,采用粒径较小及均匀性较好的滤料,适当提高氧化剂投加量来达到更好的除铁除锰效果。 相似文献
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采用石英砂/锰砂混层滤料去除电厂循环冷却水中的铁,探讨了pH值对混层滤料除铁的影响。结果表明,石英砂/锰砂比例为3∶7的混层滤料,pH值在6.5~8.5,滤速为1.5 m/h的条件下,除铁效果最好,滤后水中的总铁和亚铁含量均在11μg/L以下,达到使用要求,效果满意。该方法为电厂循环冷却水处理提供了基础实验依据,为其他工农业给水有效去除铁(Ш)的色度污染提供了参考。 相似文献
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采用钛酸酯偶联剂DN101对石英砂滤料进行表面干法改性,增强滤料的亲油疏水性。通过单因素实验研究改性时间、DN101浓度以及改性温度对改性效果的影响,并以亲油亲水比LHR作为评判改性效果的标准。结果表明,反应时间为70 min、DN101用量为1.2%、反应温度为60℃时,DN101干法改性石英砂效果最好,LHR值由未改性时的1.25提高到最大值11.1;改性石英砂对15.61 mg·L-1含油废水的吸附容量由未改性时的0.17 mg·g-1增大到0.25 mg·g-1;对17.3 mg·L-1含油废水的过滤去除率由未改性时的72.6%提高到97.8%。扫描电镜、电子能谱和红外光谱分析结果表明,DN101以化学键的方式与石英砂表面官能团结合,对石英砂形成了均匀稳定的包覆层。 相似文献
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Chang Qing Wei Bigui He Yingdong 《Chemical engineering journal (Lausanne, Switzerland : 1996)》2009,150(2-3):323-327
Lipophilic Hydrophilic Ratio (LHR) was defined based on Washburn equation. The LHR values of five filter media were calculated from the wetting rates of cyclohexane (apolar) and water (polar) through compact filter media beds measured by capillary pressure method. The surface structures of filter media were characterized by X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR). It was confirmed by great regression coefficients and reproducibility of wetting rates that the values have a good reliability and the technique is applicable. The LHR values of nutshell, manganese sand, ceramic granule, quartz sand and ceramic sand are 66.87, 1.24, 1.22, 1.16 and 0.80, respectively, which shows that nutshell is much more lipophilic while manganese sand, ceramic granule and quartz sand are somehow more lipophilic than ceramic sand. This fact is consistent with the results of XPS and FTIR. 相似文献
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基于Washburn方程用亲油亲水比(LHR)比较了0.9~1.2 mm无烟煤、锰砂和石英砂滤料的润湿性; 同时以正己烷、1-溴萘、甲酰胺和去离子水为探针液, 用Washburn方程和van Oss-Chaudhurry-Good(vCG)理论对滤料表面自由能成分进行了估算。实验测得无烟煤、锰砂和石英砂的LHR值依次为1.93、0.75和0.69, 说明无烟煤的亲油性较好而锰砂和石英砂表现出了亲水性; 估得无烟煤、锰砂和石英砂滤料的表面自由能非极性成分和极性成分依次为38.8、38.0、37.7 mJ·m-2和0.73、6.8、8.7 mJ·m-2,初步说明水处理滤料的表面润湿性与其表面自由能极性成分γABs之间有一定的相关性; 而后者归因于滤料的表面化学组成。 相似文献
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基于普通石英砂滤料表面光滑、比表面积小、微生物难以附着等缺陷,以BOE(buffered oxide etch)腐蚀液对普通石英砂滤料进行化学蚀刻处理,以改善石英砂的表面形貌,促进微生物在石英砂滤料表面附着。扫描电镜分析结果表明,经改性得到的表面重构石英砂形貌发生明显变化,整体呈沟槽形貌;因素分析试验结果表明,在腐蚀液浓度为15%(质量)、HF与NH4F的质量比为1∶1、反应温度为55℃、反应时间为45 min的条件下,所得改性石英砂表面的沟槽较多且宽度多介于1.0~5.0 μm之间,表面生物量由改性前的9.3 nmol P·g-1提高到改性后的15.7 nmol P·g-1;红外光谱分析结果显示,改性石英砂表面部分Si-O转变为Si-OH,有机物特征峰的消失反映了石英砂表面有机物的进一步去除;石英砂的比表面积由改性前的0.427 m2·g-1提高至改性后的1.475 m2·g-1;对CODCr的平均去除率由改性前的41.9%提高到改性后的51.6%。因此,表面重构石英砂具有较好的微生物亲和性,更适宜微生物的附着。 相似文献
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对自制涂铁砂进行过滤和反冲洗试验,研究不同滤层(每层为12 cm)的截污性能,并与原始石英砂和活性炭-涂铁砂组合滤料的性能进行对比研究,探讨涂铁砂对浊度和有机物的过滤效果及其再生能力。结果表明,(1)涂铁砂存在一个使用成熟期,约3个工作周期。成熟期后,其对浊度和有机物的去除率最高,为96.5%、75.4%。(2)涂铁砂对浊度的有效截污滤层集中在前2层,总去除率为88.73%。(3)经相同强度气水反冲洗后,涂铁砂滤层厚增加幅度最大(为5 cm),过滤周期为石英砂的1.5倍。(4)改进后的气水反冲洗强度为:气冲4 min,q气=12L.m-.2s-1;气水同时冲5 min,q气=12 L.m-.2s-1,qNaOH=10 L.m-2.s-1,NaOH=0.1 mol.L-1;清水漂洗3 min,q水=10 L.m-2.s-1。(5)反冲洗后,活性炭-涂铁砂组合滤料中涂铁砂表面的块状及针状形态学特征不变,对有机物的去除效果保持不变,为74.1%。 相似文献
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Wettability studies of filter media using capillary rise test 总被引:1,自引:0,他引:1
Filtration process is a typical tertiary treatment method for oily wastewater, suitable for the lower oil concentration and oil-in-water emulsion system. Therein the wettability of oil-in-water emulsions to filter media probably has some significant influences on the oil removal efficiency, namely a lipophilic filter medium have a better performance in oil droplets coalescence and attachment than a hydrophilic one. In this paper, a Lipophilic to Hydrophilic Ratio (LHR) concept was defined on the basis of Washburn's equation and a test equipment was correspondingly designed, which were used to compare quantificationally the wettable selectivities of three filter media to oil and water. The selected filters were anthracite, manganese ore and quartz sand particles with a size fraction of +0.9 to 1.2 mm and the wetting liquids were apolar cyclohexane and polar deionized water. At the same time, the effect of filter particle size on the LHR value was also explored. Linear least-square fits for all wetting rates gave regression coefficients of more than 0.9991, confirming the suitability of the experimental method for filter particles and further validating Washburn's theory. The determined LHR values of anthracite, manganese ore and quartz sand are 1.93, 0.75 and 0.69, respectively, which means anthracite is lipophilic while manganese ore and quartz sand are hydrophilic. Moreover, for three selected particle size fractions the LHR values of anthracite particles are always the greatest and that of manganese ore are a little bit greater than quartz sand particles. Therefore, it can be deduced that the wettable differences probably be attributed to the differences of surface chemistries of filter samples. Namely, anthracite surface contains principally organic functional groups composed of carbon and oxygen elements and therefore presents apolar and lipophilic characterization, while manganese ore and quartz sand surfaces have SiO2 species and make them polar and hydrophilic. This conclusion is approximatively confirmed by the analysis results of X-ray photoelectron spectroscopy (XPS). 相似文献