共查询到19条相似文献,搜索用时 687 毫秒
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高性能粉煤灰陶粒的研制及其特性研究 总被引:2,自引:0,他引:2
本文利用粉煤灰代替粘土,制备得到了具有比表面积粗糙度高并具有多微孔结构的纳米改性陶粒填料,填料比表面积高达10.626m2/g,比国产陶粒的比表面积(4.11m2/g)提高了158.54%。将该陶粒应用于AF处理中低浓度生活废水,运行稳定,其性能明显优于国产商品陶粒,并降低了制备成本,具有广阔的应用前景。 相似文献
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以粉煤灰为主要原料,黏土、脱水污泥、脱硫石膏等为辅料,自制了粉煤灰陶粒。通过强度性能筛选出原料的最优配比为粉煤灰:脱水污泥:黏土:脱硫石膏= 85:10.5:0.5:4。研究对比了自制粉煤灰陶粒与市售的陶瓷陶粒和黏土陶粒的性能,如扫描电镜、孔隙率、盐酸可溶率、比表面积等,结果显示:粉煤灰陶粒的表面粗糙度最大,孔隙率最高,比表面积最大,密度最小。进一步比较了3种陶粒用作曝气生物滤池填料处理城市污水的效果。结果表明,粉煤灰陶粒填料对COD的去除率可达到80%以上,对NH3-N的去除率可达到90%,对总磷(TP)的去除率高于80%,均明显优于其他两种市售陶粒填料。 相似文献
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采用造粒、干燥、预热、烧结工艺,以油页岩半焦、粉煤灰、污泥三种固体废弃物为原料制备污水处理厂用人工陶粒滤料。以盐酸可溶率、筒压强度、空隙率和比表面积为陶粒滤料主要性能指标,探究陶粒烧制过程中原料配比、烧结温度及原材料特性等因素对陶粒性能的影响。实验结果表明:油页岩半焦与粉煤灰的最佳比例为3∶5,煅烧温度超过1125℃时陶粒的比表面积和空隙率有明显的降低。随着陶粒原料中污泥含量的提高,盐酸可溶率和筒压强度逐渐降低,而空隙率和比表面积逐渐升高,但仍符合CJ/T 299-2008标准的要求。油页岩半焦中残余的有机组分有利于陶粒制备过程中孔隙的形成。 相似文献
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纤维陶粒作为填料在生物滤池中的快速挂膜 总被引:1,自引:0,他引:1
以小麦秸秆和电厂粉煤灰为主要原料,辅以外加药剂(水泥、石灰、石膏、水玻璃),经混合、成球、陈化和养护工序,制得免烧秸秆-粉煤灰纤维陶粒(简称纤维陶粒),并将其作为曝气生物滤池(BAF)的载体填料进行挂膜启动。试验考察了外加药剂对纤维陶粒比表面积的影响及挂膜过程中COD、氨氮和总磷的去除情况。结果表明,外加药剂对纤维陶粒比表面积的影响主次顺序为:石灰>水玻璃>水泥>石膏;优组合为(质量分数):石灰8%,水玻璃2%,水泥3%,石膏2.5%;在优组合下制得的纤维陶粒的比表面积为7.925 m2/g;挂膜启动后,COD、氨氮和总磷的去除率呈增加趋势,10 d后趋于平稳,平均去除率分别为87.3%、74.64%和80.01%,出水水质良好。 相似文献
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以CO2-NaOH为介质,研究了填料结构、超重力因子、液体流量和气体流量等对两种多孔板错流旋转床有效比表面积的影响规律.结果表明,不锈钢多孔波纹板的有效比表面积大于聚丙烯多孔板,不锈钢多孔波纹板填料利用周期性变化的波纹表面不仅可以有效利用填料自身的比表面积,而且可起到良好的雾化扩展比表面积的作用,使有效比表面积增大至2.66倍.对实验数据进行回归得出了两种填料结构有效比表面积的关联式,根据关联式计算的有效比表面值与实验值吻合较好. 相似文献
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Preparation of decolorizing ceramsites for printing and dyeing wastewater with acid and base treated clay 总被引:3,自引:1,他引:2
Xiangli Guo Yadong Yao Guangfu Yin Yunqing Kang Yong Luo Lang Zhuo 《Applied Clay Science》2008,40(1-4):20-26
A new type of decolorizing ceramsites for printing and dyeing wastewater were prepared, by means of acid activation, base neutralization, granulation and heating treatment, by using palygorskite, Hangjin2# clay, bentonite or sepiolite as raw materials. The experimental results show that, the decolorizing ceramsites made of palygorskite have the best performances among different clay minerals in treating printing and dyeing wastewater. Its decolorizing amount is 635 mL g− 1 and the reduction in COD is 81%, after 5 min static treatment at normal temperature. After calcined at 700 °C for 1 h, the loss ratio of decolorizing ceramsites made of palygorskite is less than 5%. Treated with saturated (NH4)2SO4 solution for 10 min, and then calcined at 300 °C for 10 min, the used decolorizing ceramsites can be reused for more than 15 times. The decolorizing effect of the decolorizing ceramsites is mainly attributed to the combined chemical flocculation reaction of various metal ions in the material, with minor physical adsorption involved. 相似文献
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雨水中病原微生物的控制技术 总被引:1,自引:0,他引:1
雨水已成为当今水环境污染的重要影响因素之一,同时它也是一种宝贵的可利用水资源,但是雨水中存在一定量不同种类的病原微生物,如不进行一定处理或处理方法不当,会对人体健康造成危害,迄今为止因雨水中病原微生物引发的环境问题及人类健康问题已有很多。当前对于雨水的污染控制研究往往局限于氮、磷、化学需氧量等常规指标,而对其中病原微生物去除的研究却很少涉及,专门针对雨水中病原微生物的控制技术则比较少。该文在介绍雨水中病原微生物的污染状况的基础上,阐述了美国最佳管理实践(BMPs)及过滤与消毒等技术在控制雨水中病原微生物方面的应用。 相似文献
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《Ceramics International》2023,49(19):31385-31395
Preparation of high-strength densified ceramsites and porous water-retaining ceramsites to replace part of the original gravel aggregates and natural moisturizing materials, respectively, is an effective way for the resource utilization of coal gangue (CG). The pore structure of ceramsites affects their strength, density, porosity, etc. In this paper, CG was used as the sole raw material to prepare ceramsites at different temperatures (600–1220 °C). By using methods of thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), element analysis (EA), heating microscope (HM), and density tester (DT), the evolution mechanism of pore structure in sintered coal gangue ceramsites (CGCs) was discussed. The results showed that there were two key temperatures: 950 °C and 1160 °C. Below 950 °C, the pore structure of CGCs was in a stable state, and the true, apparent, and closed porosity remained around 45%, 32%, and 12%, respectively. At 950–1160 °C, the true and apparent porosity decreased, and the closed porosity and compressive strength increased. Above 1160 °C, its performance deteriorated. During the heating process, the loss of carbon-containing components, phase transition, high-temperature diffusion and densification would change the pore structure. The appropriate temperature range for the preparation of porous water-retaining CGCs was about 950 °C, while that for preparing high-strength densified CGCs was about 1000–1160 °C. It was proved that qualified CGC products with different prospective applications could be prepared in different temperature regimes. 相似文献
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不锈钢模具板化学蚀刻、抛光和电镀铬研究 总被引:1,自引:0,他引:1
研究了不锈钢模具板的化学蚀刻、化学抛光和电镀铬工艺。分析了影响蚀刻、化学抛光和电镀铬质量的因素,得到了化学蚀刻、化学抛光及电镀铬最佳工艺参数和操作规范。该工艺可以用于各种类型不锈钢的化学蚀刻、化学抛光和电镀铬处理。 相似文献
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