共查询到19条相似文献,搜索用时 421 毫秒
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等离子体与光催化复合技术净化污水处理泵站臭气 总被引:1,自引:0,他引:1
用一种等离子体-光催化复合技术净化污水处理泵站臭气,研究表明该复合技术具有较显著的协同促进效应,通过改变等离子体发生单元与光催化单元的距离以及在两者之间放置去静电网,可消除等离子体单元产生的负电荷对光催化单元的不利影响,进一步提高其复合效应。同时还对这一复合技术产生协同效应的机理进行了分析,并在污水处理泵站实地考查了这种复合技术对臭气的净化效果。该技术对臭气中NH3的降解率可达46.1%,对H2S的降解率可达67.3%。 相似文献
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臭氧光催化降解地下水中天然有机物的研究 总被引:2,自引:0,他引:2
在现场开展了中试规模的臭氧光催化降解天然有机物的研究。研究表明,对大分子天然有机物占很大比例且重碳酸盐含量较高的地下水,臭氧投加量10mg/L和反应时间10min条件下,TOC的去除率不到20%,但uV254和三卤甲烷生成潜力(THMFP)去除率分别达到近60%和33.5%。臭氧光催化与活性炭吸附相连,能显著提高UV254的THMFP的去除率,但TOC去除率并不明显高于单独活性炭吸附。臭氧光催化使大分子有机物转化为小分子有机物,后者在活性炭上的吸附性提高且生化性改善,可望在生物活性炭上更有效地去除。 相似文献
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1998年末,鞍山静电技术研究设计院研制的静电除雾器在上海宝山钢铁公司冷轧厂首次应用,取得了非常理想的净化效果。本文概述了酸雾对该厂2030CM01酸洗工艺段的危害,并对静电除雾器的工作原理、净化过程、设计特点和现场使用等方面作出了系统论述。 相似文献
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1998年末 ,鞍山静电技术研究设计院研制的静电除雾器在上海宝山钢铁公司冷轧厂首次应用 ,取得了非常理想的净化效果。本文概述了酸雾对该厂 2 0 30CM0 1酸洗工艺段的危害 ,并对静电除雾器的工作原理、净化过程、设计特点和现场使用等方面作出了系统论述。 相似文献
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负载型Ti02/活性炭光催化灭活大肠杆菌(E.coli)的研究 总被引:2,自引:0,他引:2
以大肠杆菌(Escherichia coli JM 109)为研究对象,通过细菌的灭活实验研究负载型TiO2/活性炭(TiO2/AC)的灭菌性能,并利用XRD、BET和SEM对材料的晶型、晶粒尺寸、比表面积和吸附在材料上的细菌分布形态及数量进行分析。结果表明:吸附在TiO:/AC上的大肠杆菌数比吸附在活性炭和TiO2都多。TiO2/AC对E.coli光催化灭活率比TiO2粉末和P25高,制备材料的热处理温度500℃和光催化反应中光强40W都分别使TiO2/AC的光催化活性达到最大,在光催化灭活E.coli过程中,KH2PO4使催化剂活性降低程度比NaHCO3大,而两者使TiO2/AC催化活性降低程度比Ti02小,但NaHCO3对催化活性的影响是可逆的。 相似文献
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固定化催化剂光反应器降解有机物研究进展 总被引:8,自引:1,他引:8
本文系统介绍了在TiO2的非悬浆式体系中,光催化氧化有机污染物效率的影响因素、新型光反应器的特点以及污染物的降解动力学规律。可以预见,光催化氧化与传统的处理方法相比,有着良好的应用前景。 相似文献
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摘要以自制的TiO2/活性炭复合纳米纤维膜作为吸附剂,以亚甲基蓝为目标污染物,研究了亚甲基蓝初始浓度、温度、TiO2/活性炭复合纳米纤维膜投加量、pH等对TiO2/活性炭复合纳米纤维膜吸附去除亚甲基蓝的影响,并研究了TiO2/活性炭复合纳米纤维膜的Zeta电位、接触角、光催化再生性能.结果表明:(1)静态吸附时,随着亚... 相似文献
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在现场开展了中试规模的臭氧光催化降解天然有机物的研究.研究表明,对大分子天然有机物占很大比例且重碳酸盐含量较高的地下水,臭氧投加量10 mg/L和反应时间10 min条件下,TOC的去除率不到20%,但UV254和三卤甲烷生成潜力(THMFP)去除率分别达到近60%和33.5%.臭氧光催化与活性炭吸附相连,能显著提高UV254的THMFP的去除率,但TOC去除率并不明显高于单独活性炭吸附.臭氧光催化使大分子有机物转化为小分子有机物,后者在活性炭上的吸附性提高且生化性改善,可望在生物活性炭上更有效地去除. 相似文献
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以集中空调中处理室内可挥发性有机物(VOCs)为应用背景,搭建了试验台.实验研究了真空紫外灯(主波长254 nm,185 nm)降解甲醛的影响因素以及产生O3的情况.研究表明,在产生的O3浓度低于室内空气质量标准(0.16mg/m3)的情况下,真空紫外灯也能够高效地降解空气中低浓度甲醛(<1 mg/m3);甲醛降解率与反应器空气流速及甲醛初始浓度成反比;降解速率与甲醛初始浓度成正比,与反应器空气的流速成反比;绝对湿度对真空紫外灯降解甲醛有一定的影响;反应器空间大小对甲醛降解影响比较显著.应用于集中空调系统净化室内空气中VOCs,取得了很好的效果. 相似文献
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大气污染事故预测系统的研究 总被引:2,自引:0,他引:2
将地理信息系统应用于城市突发性的大气污染事故,对大气扩散模型的图形技术进行开发研究。介绍了设计的总体结构;详细叙述了数学模型的建立、编程语言及其关键技术。该技术能模拟显示化学品泄漏后的大气污染扩散范围,为应急反应科学决策服务。 相似文献
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生物过滤技术是一项新兴的废气污染治理技术 ,正在逐步得到应用。本文主要介绍了生物过滤技术处理废气的使用范围、操作的基本原理及目前的应用情况 ,并且预测今后的发展方向。 相似文献
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Marc Carreras-Sospedra Satish Vutukuru Jacob Brouwer Donald Dabdub 《Atmospheric environment (Oxford, England : 1994)》2010,44(26):3215-3223
This study assesses the air quality impacts of central power generation and compares them with the impacts of distributed generation (DG). The central power plant emissions factors used are from a newly installed combined cycle gas turbine system. Because location of power plants is a key parameter affecting air quality impacts, this study considers three potential locations for the installation of central power plants. Air quality impacts are evaluated for the South Coast Air Basin of California, in the year 2010, using a three-dimensional air quality model. Results are compared to air quality impacts from two potential DG scenarios to meet the same power demand as that of the central power plant case.Even though emissions from central generation are lower than emissions from the DG technology mix considered herein, central generation concentrates emissions in a small area, whereas DG spreads emissions throughout a larger cross-section of the air basin. As a result, air quality impacts from central generation are more significant than those from DG. The study also shows that assessment of air quality impacts from distributed and central generation should not only consider emissions levels, but also the spatial and temporal distribution of emissions and the air quality that results from atmospheric chemistry and transport – highly non-linear processes.Finally, analysis of population exposure to ozone and PM2.5 shows that central generation located in coastal areas upwind from populated areas would cause the highest population exposure and even though emissions from central generation are considerably lower than DG emissions spread throughout the basin, results show that central generation causes a higher pollutant exposure than DG. 相似文献
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Effectiveness of photocatalytic filter for removing volatile organic compounds in the heating, ventilation, and air conditioning system 总被引:1,自引:0,他引:1
Yu KP Lee GW Huang WM Wu CC Lou CL Yang S 《Journal of the Air & Waste Management Association (1995)》2006,56(5):666-674
Nowadays, the heating, ventilation, and air conditioning (HVAC) system has been an important facility for maintaining indoor air quality. However, the primary function of typical HVAC systems is to control the temperature and humidity of the supply air. Most indoor air pollutants, such as volatile organic compounds (VOCs), cannot be removed by typical HVAC systems. Thus, some air handling units for removing VOCs should be added in typical HVAC systems. Among all of the air cleaning techniques used to remove indoor VOCs, photocatalytic oxidation is an attractive alternative technique for indoor air purification and deodorization. The objective of this research is to investigate the VOC removal efficiency of the photocatalytic filter in a HVAC system. Toluene and formaldehyde were chosen as the target pollutants. The experiments were conducted in a stainless steel chamber equipped with a simplified HVAC system. A mechanical filter coated with Degussa P25 titania photocatalyst and two commercial photocatalytic filters were used as the photocatalytic filters in this simplified HVAC system. The total air change rates were controlled at 0.5, 0.75, 1, 1.25, and 1.5 hr(-1), and the relative humidity (RH) was controlled at 30%, 50%, and 70%. The ultraviolet lamp used was a 4-W, ultraviolet-C (central wavelength at 254 nm) strip light bulb. The first-order decay constant of toluene and formaldehyde found in this study ranged from 0.381 to 1.01 hr(-1) under different total air change rates, from 0.34 to 0.433 hr(-1) under different RH, and from 0.381 to 0.433 hr(-1) for different photocatalytic filters. 相似文献