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101.
102.
介质阻挡放电联合催化臭氧化降解甲苯 总被引:4,自引:2,他引:2
采用介质阻挡放电区后结合MnOx/Al2O3/发泡镍去除甲苯,考察甲苯进气方式、臭氧产生方法及湿度对甲苯与O3同时去除的影响。结果表明,O3是等离子体区后催化降解甲苯的主要物种,介质阻挡放电联合催化臭氧化可实现甲苯及O3的同时高效去除。输入电压为9.0 kV时,甲苯的去除效率达92.8%,在80 min内O3的去除效率维持在99%以上。水蒸气对催化剂催化分解臭氧的活性没有直接的影响,O3浓度较高时湿度对甲苯降解效率的影响很小。GC-MS分析结果表明,甲苯降解的主要气相副产物有烷烃、酸、酮和含苯环有机物,提出了甲苯的降解途径。 相似文献
103.
104.
Henrieta Dulaiova Richard Camilli Matthew A. Charette 《Journal of environmental radioactivity》2010,101(7):553-8921
We constructed a survey system of radon/methane/nitrate/salinity to find sites of submarine groundwater discharge (SGD) and groundwater nitrate input. We deployed the system in Waquoit Bay and Boston Harbor, MA where we derived SGD rates using a mass balance of radon with methane serving as a fine resolution qualitative indicator of groundwater. In Waquoit Bay we identified several locations of enhanced groundwater discharge, out of which two (Childs and Quashnet Rivers) were studied in more detail. The Childs River was characterized by high nitrate input via groundwater discharge, while the Quashnet River SGD was notable but not a significant source of nitrate. Our radon survey of Boston Harbor revealed several sites with significant SGD, out of these Inner Harbor and parts of Dorchester Bay and Quincy Bay had groundwater fluxes accompanied by significant water column nitrogen concentrations. The survey system has proven effective in revealing areas of SGD and non-point source pollution. 相似文献
105.
The radon isotope 222Rn and salinity in coastal surface water were mapped on regional scales, to improve the understanding of coastal processes and their spatial variability. Radon was measured with a surface-towed, continuously recording multi-detector setup on a moving vessel. Numerous processes and locations of land-ocean interaction along the Central Great Barrier Reef coastline were identified and interpreted based on the data collected. These included riverine fluxes, terrestrially-derived fresh submarine groundwater discharge (SGD) and the tidal pumping of seawater through mangrove forests. Based on variations in the relationship of the tracers radon and salinity, some aspects of regional freshwater inputs to the coastal zone and to estuaries could be assessed. Concurrent mapping of radon and salinity allowed an efficient qualitative assessment of land-ocean interaction on various spatial and temporal scales, indicating that such surveys on coastal scales can be a useful tool to obtain an overview of SGD locations and processes. 相似文献
106.
基于AERMOD模式的固定源对不同楼层大气污染预测研究 总被引:1,自引:0,他引:1
环境影响评价中,大气污染预测通常考虑地面的浓度影响,对高层住宅楼不同楼层影响的考虑较少.通过案例设计,模拟4种不同的污染排放情景,采用预测推荐模式AERMOD分别计算各情景下5个代表高度共20种组合情况的预测受体结果,并基于三维可视仪软件VOXLER直观显示各情景污染物浓度的空间连续分布情况,对小时最大浓度的分布规律利用分析工具CANOCO进行了分析.结果表明:(1)污染源高为15~80 m时,不同楼层间小时浓度分布差异性较大;污染源高为120~240 m时,楼层间差异性较小.(2)污染源高为15m时,小时最大浓度以50 m为分界线随楼层高度的增加先增后降;污染源高为80~240 m时,小时最大浓度随楼层高度的增加而增加. 相似文献
107.
为了解决湿式氨法烟气脱硫生成不稳定亚硫酸铵((NH4)2SO3)副产物的问题,设计了以不锈钢弹簧和溶液分别作为高压和低压电极的沿面放电系统,对液相(NH4)2SO3的氧化进行了研究。空气从反应器上方进入后经放电区域形成活性物质,再由底部的曝气头鼓入溶液并与(NH4)2SO3发生反应。比较了沿面放电处理与传统曝气处理的氧化效率,考察了放电电压、载气气量和初始浓度等因素对(NH4)2SO3氧化的影响。结果表明,沿面放电对(NH4)2SO3有显著的氧化效果;优化条件下的(NH4)2SO3氧化率接近100%;溶液中(NH4)2SO4与(NH4)2SO3的浓度比小于1时有利于(NH4)2SO3的氧化。 相似文献
108.
微波辅助光催化降解高浓度活性黑 总被引:1,自引:0,他引:1
利用改装的家用微波炉、微波无极灯和TiO2催化剂研究了水中高浓度活性黑的光催化降解.系统考察了TiO2投加量、pH、微波无极灯数量对微波辅助光催化处理效果的影响,得出微波辅助光催化的最佳操作条件,并在最佳条件下对活性黑的脱色及矿化效果进行研究.结果表明,TiO2投加量存在最佳值2 g/L,降低pH和增加微波无极灯数量均可提高活性黑的降解率.在TiO2的投加量为2 g/L,pH =3,微波无极灯数量为3的最佳光催化条件下,400 mg/L的活性黑溶液反应180 min时可实现完全脱色,反应300 min时,TOC去除率高达89.1%. 相似文献
109.
The effect of polarity on the oxidation of Hg0 was examined in the presence of O2 via a pulsed corona discharge (PCD). The experimental result showed no difference in the energy yield of Hg0 oxidation at both positive and negative PCDs (∼8 μg Hg W h−1 at following conditions: total flow rate = 2 L min−1 (Hg0 = 50 μg N m−3, O2 = 10%, and N2 balance), temperature = 150 °C, and specific energy density = 5-15 W h N m−3). This suggests that the positive PCD process used to control gaseous air pollutants may play an essential key role in Hg0 oxidation because it consumes enough energy (∼15 W h N m−3) but an electrical precipitator could not because it consumes less energy (∼0.3 W h N m−3) to oxidize Hg0. 相似文献
110.
Electrical discharge processes are emerging as water treatment technologies applicable to both the degradation of organic contaminants as well as inactivation of pathogens. Particularly as a disinfection technology, electrical discharge processes do not produce toxic byproducts, and effectively inactivate a wide spectrum of microorganisms by multiple lethal actions generated by the formation of plasma channels. This study demonstrates the inactivation of a virus using the streamer corona discharge process (SCDP) with MS2 phage as a surrogate. A rapid inactivation of MS2 phage (i.e., approximately 4 log inactivation in 5 min) was observed in all experimental runs conducted. Discharge conditions such as applied voltage and storage capacitance significantly affected the inactivation efficiency of MS2 phage, whereas the influence of water quality parameters was minor. In order to elucidate the mechanism of MS2 phage inactivation, potentially lethal factors that can be generated by the SCDP were selected, and their roles in the inactivation of MS2 phage were examined. As a result, effects of UV radiation, chemical oxidants, and pulsed electric fields were found to be insignificant. The shockwave generated upon plasma channel formation appears to be the most important factor responsible for MS2 phage inactivation. 相似文献