共查询到16条相似文献,搜索用时 78 毫秒
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在对旋转式滗水器进行了水力学和运动学计算的基础上,对旋转式滗水器进行了动力学计算,给出了其动力学计算公式,与水力学和运动学计算公式一起,共同给出了旋转式滗水器完整的设计计算公式。 相似文献
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SBR系统静压式滗水器的研究 总被引:1,自引:0,他引:1
对SBR系统静压式滗水器进行了研究,与传统SBR系统常用的滗水器进行比较,研究结果表明,该滗水器具有运行稳定、滗水负荷大、能耗低、自动化程度高、造价及维修费用低等特点,减少机械设备,结构简单,便于与SBR系统的控制方式相结合,具有实际应用价值。 相似文献
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为计算颗粒层非稳态过滤效率,通过改进经典过滤理论模型,考虑颗粒在过滤介质中的沉积,理论推导得出非稳态过滤效率的计算公式,而经典颗粒层过滤效率计算公式仅为此计算公式的特例。因为理论计算公式是隐函数,不便于工程实际应用,所以,在常温条件下,对非稳态过滤时的过滤时间、过滤风速、过滤层厚度、粉尘浓度和颗粒层滤料均粒径等五个因素进行了正交实验研究。采用多元回归的方法得出各影响因素与过滤效率呈显性关系的效率关联计算公式,其计算结果与实验测试结果基本吻合。 相似文献
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本文通过对加压溶气过程的分析 ,建立了理想加压溶气过程模型 ,在此基础上推导出新的理论溶气量计算公式 ,并与现有的计算公式进行了比较。 相似文献
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加压溶气气浮设备理论溶气量的计算 总被引:1,自引:0,他引:1
王文海 《环境污染治理技术与设备》2002,3(7):35-38
本文通过对加压溶气过程的分析,建立了理想加压溶气过程模型,在此基础上推导出新的理论溶气量计算公式,并与现有的计算公式进行了比较。 相似文献
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提出一种新型除雾装置——自由旋片除雾器。在实验室条件下,从除雾效率、压力损失两方面研究了自由旋片除雾器的性能。实验结果表明,风速在11 m/s左右时,自由旋片除雾器的除雾效率达到最大值。对比实验发现,自由旋片除雾器的除雾效率远高于固定叶片除雾器的除雾效率,二者的除雾效率最大值相差约10%。自由旋片除雾器的除雾效率变化曲线在6~13 m/s的流速范围内相当平滑,说明自由旋片除雾器对含雾气流流速的波动有很好的适应性。另外,增加液气比和雾滴粒径会提高自由旋片除雾器的除雾效率。自由旋片除雾器压力损失系数仅为4.3,而固定叶片除雾器压力损失系数为6.6。所以,自由旋片除雾器的阻力特性远优于固定叶片除雾器。 相似文献
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Cope WG Wiener JG Steingraeber MT 《Environmental pollution (Barking, Essex : 1987)》1996,91(2):177-182
We describe a new test system for exposing fish to resuspended sediments and associated contaminants. Test sediments were resuspended by revolving test chambers on rotating shafts driven by an electric motor. The timing, speed, and duration of test-chamber revolution were controlled by a rheostat and electronic timer. Each chamber held 45 litres of water and accommodated about 49 g of test fish. The system described had three water baths, each holding six test chambers. We illustrate the performance of this system with results from a 28-day test in which juvenile bluegills Lepomis macrochirus were exposed to resuspended, riverine sediments differing in texture and cadmium content. The test had one sediment-free control and five sediment treatments, with three replicates (chambers) per treatment and 25 fish per replicate. Two-thirds (30 litres) of the test water and sediment in each chamber was renewed weekly. The mean concentration of total suspended solids (TSS) did not vary among treatments; the grand-mean TSS in the five sediment treatments was 975 mg litre(-1), similar to the target TSS of 1000 mg litre(-1). At the end of the test, an average of 50% of the introduced cadmium was associated with the suspended sediment compartment, whereas the filtered (0.45 microm) water contained 0.4% and bluegills 1.8% of the cadmium. 相似文献
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《国际环境与污染杂志》2011,12(1):57-66
Revolving type fluidized-bed technology, developed by Ebara Corp., is installed in more than 100 facilities worldwide. The technology is applied for waste, coal and in situations where a conventional fluidized bed is difficult to use. Waste and/or coal can be treated and valuable energy can be recovered from a non-renewable source. This paper describes the application of the revolving fluidized bed for waste, coal and tyres. 相似文献
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John C. Villforth 《Journal of the Air & Waste Management Association (1995)》2013,63(5):222-227
A semi-automated method for determination of fluorine in biological materials has been developed incorporating the Technicon AutoAnalyzer. One-half gram of dried, ground plant material is ashed, alkali-fused, diluted with water, and the suspension is pumped, along with H2SO4, at controlled rates, into the hot revolving glass helix of a digestor unit. As the acid-digest mixture passes through the heated coil, volatile fluoride and water vapor are evolved. The volatile fluoride and water vapor are pulled from the helix under reduced pressure through a tube which projects into the helix. The tube, in turn, is connected to a water-jacketed condenser and then to an impinger where the sample is continuously mixed. An aliquot of the impinger liquid is being constantly withdrawn. This sample is then air-segmented and mixed with a reagent containing alizarin complexone, pH 4 acetate buffer, lanthanum nitrate, acetone, and water. The sample-reagent combination passes through 4 full-length mixing coils where color development takes place. Upon reacting with fluoride, the wine-red alizarin complexone-La(III) reagent forms a lilac blue fluoride complex. The solution is pumped from the mixing coils through the tubular flow cell of the colorimeter. The absorbence of the solution is measured at 624 mμ, and the signal is transmitted to a recorder where the results are plotted on absorbency paper. The absorbence at the apex of the peak is proportional to the amount of fluoride in the sample between the range of 2.5-80 μg °F. Samples are analyzed at a rate of 12 per hour. Results compare favorably with those obtained by Willard-Winter distillation. Recent studies indicate that the F content of plant tissues can be estimated without prior ashing and fusion 相似文献
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Juha Keränen Heidi Ahkola Juha Knuutinen Sirpa Herve Marko Reinikainen Jaana Koistinen 《Environmental science and pollution research international》2013,20(11):8001-8012
The formation of perfluorooctanoate (PFOA) from 1H,1H,2H,2H-perfluorodecanol (8:2 FTOH) was studied for the first time in laboratory experiments with brackish water. The water samples were collected from the Baltic Sea, which is one of the largest brackish water areas in the world and is polluted with PFOA and other perfluorinated compounds. The formation of PFOA was studied in closed-bottle experiments at different water temperatures. As a reference experiment, a modified OECD 310 test was conducted with sludge from a wastewater treatment plant and with brackish water. The PFOA and 8:2 FTOH were concentrated from water samples by solid-phase extraction (SPE) and were analysed using liquid chromatography–mass spectrometry. The effect of oxygen concentration on the formation of PFOA was studied using surface water samples with high and low oxygen contents. Other experiments were performed with oxygen-rich surface water and oxygen-deficient bottom water. The formation of PFOA was observed in all experiments; it was higher in the trial performed with brackish water than in the reference test carried out with sludge. Clear temperature dependence was observed in the formation of PFOA in brackish water tests; after a 30-day test period, a sixfold increase was observed in the amount of PFOA in surface water between the temperatures of 15 and 20 °C. Microbes were suggested as the major cause of the formation of PFOA, but other environmental characteristics, such as oxygen, could also affect the formation potential of PFOA. 相似文献