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排序方式: 共有73条查询结果,搜索用时 140 毫秒
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采用陶瓷微滤膜膜组件回收钛白粉厂锻烧尾气洗涤废水中的钛白粒子,在采用压缩空气反冲洗的措施下,对影响膜通量的因素包括尾气洗涤废水的性质(TiO2浓度、温度)、膜孔径、操作压力等进行了探讨,并进行了长期稳定性的考察。结果表明,采用陶瓷微滤膜回收钛白粉厂锻炼尾气洗涤废水中的TiO2是可行的,TiO2截留率可达99%以上;试验确定了对可工业化应用的工艺操作参数,为工艺的工业化应用奠定了基础。 相似文献
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Antonio D. Dorado Shafik Husni Guillem Pascual Carles Puigdellivol David Gabriel 《Waste management (New York, N.Y.)》2014,34(2):344-351
Emissions of volatile organic compounds (VOCs) from the compost maturation building in a municipal solid waste treatment facility were inventoried by solid phase microextraction and gas chromatography–mass spectrometry. A large diversity of chemical classes and compounds were found. The highest concentrations were found for n-butanol, methyl ethyl ketone and limonene (ppmv level). Also, a range of compounds exceeded their odor threshold evidencing that treatment was needed. Performance of a chemical scrubber followed by two parallel biofilters packed with an advanced packing material and treating an average airflow of 99,300 m3 h?1 was assessed in the treatment of the VOCs inventoried. Performance of the odor abatement system was evaluated in terms of removal efficiency by comparing inlet and outlet abundances. Outlet concentrations of selected VOCs permitted to identify critical odorants emitted to the atmosphere. In particular, limonene was found as the most critical VOC in the present study. Only six compounds from the odorant group were removed with efficiencies higher than 90%. Low removal efficiencies were found for most of the compounds present in the emission showing a significant relation with their chemical properties (functionality and solubility) and operational parameters (temperature, pH and inlet concentration). Interestingly, benzaldehyde and benzyl alcohol were found to be produced in the treatment system. 相似文献
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文丘里洗涤器具有传质效率高、无需额外动力及设备尺寸小等优点,在危险化学品洗消、工业除尘等领域有着广泛应用,为了分析文丘里洗涤器内的气液运动规律获得强化机理,利用CFD构建三维模型,分析了非浸没式文丘里喉部气速、浸没高度、喉部间距等典型操作参数对文丘里内部流场、分散效果以及引射性能的影响。发现受气体剪切的作用,进入文丘里洗涤器内部的液体主要贴壁运动,只有少部分被分散形成雾滴。引射量随入口速度的增加而增加,当入口气速增加至18.4 m/s时,引射量增加了5倍,从0.11 kg/s增加到0.53 kg/s。引射量随浸没高度的降低和喉部间距的增大而降低,喉部间距的增加,降低了液膜在管壁附着量,增加了在文丘里洗涤器中间的分布,提高了气-液体的碰撞概率。此外,也发现挡板分布器的加入,降低了液体的贴壁量,增加了液体组分的均匀性,提高了气液接触的概率。 相似文献
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Ahmad Kalbasi Ashtari Amir M. Samani Majd Gerald L. Riskowski Saqib Mukhtar Lingying Zhao 《Frontiers of Environmental Science & Engineering》2016,10(6):3
Slightly acidic solutions are a practical means of removing ammonia from air
Scrubbed NH3 accumulates in solution as NH4+ and should be an excellent fertilizer
Increased air velocity decreased NH3 removal and increased NH4+ collection
Previous research on wet scrubbers has only studied highly acidic scrubbing solutions because of their high ammonia capture efficiencies; however, the high acidity created practical problems. Lower acidity solutions would reduce corrosion, maintenance, and cost; however, designers may need to use strategies for increasing scrubber effectiveness, such as using lower air velocities. The objective of this study was to determine if a spray scrubber with slightly acidic and higher pH scrubbing solution (pH from 2 to 8) could effectively remove NH3 from NH3 laden air (such as animal building exhaust air), and also collect this valuable resource for later use as a fertilizer. A bench-scale spray wet scrubber treated 20 ppmv NH3/air mixture in a countercurrent contact chamber. First, the solution pH was varied from 2 to 8 while maintaining constant air velocity at 1.3 m·s−1. Next, air velocity was increased (2 and 3 m·s−1) while solution pH remained constant at pH6. At 1.3 m·s−1, NH3 removal efficiencies ranged between 49.0% (pH8) and 84.3% (pH2). This study has shown that slightly acidic scrubbing solutions are a practical means of removing ammonia from air especially if the scrubber is designed to increase collisions between solution droplets and NH3 molecules. The NH3 removed from the air was held in solution as NH4+ and accumulates over time so the solution should be an excellent fertilizer. 相似文献
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针对某企业蒸汽锅炉消烟除尘系统存在的问题,选用了新型花岗岩水膜除尘器,进行了消烟除尘系统改造,通过改造前后的监测数据对比,表明改造是成功的。 相似文献
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