共查询到20条相似文献,搜索用时 15 毫秒
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W. R. Hess 《Die Naturwissenschaften》1942,30(36):537-541
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H. Mix 《Die Naturwissenschaften》1956,43(20):469-470
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M.J. Ginnivan 《Agriculture, ecosystems & environment》1983,10(1):31-36
The effect of shallow aeration on odours from anaerobic lagoons treating piggery wastes was determined in the laboratory under conditions of approximately constant temperature (20°C). The loading rate to the simulated lagoon profiles was approximately 50 g BOD5 m?3 day?1 and the average retention time was 128 days. The removal of organic pollutants and bacteria in this system has been discussed elsewhere.Shallow surface aeration to depths ranging from 8 to 40 cm reduced odours from piggery waste treatments. Chemical and organoleptic estimates consistently indicated that odour levels from all aerated treatments were similar and markedly better than those from the unaerated treatment.The average volatile sulphides levels in the aerated treatments were less than 5% of the levels found in the space above the unaerated treatment. The levels in the aerated treatments of less than 0.07 ppm were below the odour threshold limit of 0.1 ppm compared with 1.45 ppm in the unaerated column. Odour threshold dilution (OTD), and more particularly odour offensiveness, were also reduced by shallow surface aeration. The mean OTD values (log10) of all lagoon treatments (unaerated 2.9 and <2.6 for aerated treatments) were less than that of the untreated waste (3.3) or from wastes stored anaerobically in underslat pits (4.2). Once perceived however, the offensiveness rating of odours from the unaerated treatment was greater (9.4) than from the aerated systems (<1.7).Volatile fatty acid (VFA) levels in the effluents from all treatments were negligible (< 0.01 g l?1).Total VFA levels in the untreated waste were 2.1 g l?1, of which approximately 57, 20 and 11% were acetic, propionic and n-butyric, respectively. Sludge VFA levels were about 0.2 g l?1, of which 75% was acetic acid. 相似文献
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M. M. Roy 《Die Naturwissenschaften》1955,42(7):177-178
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Joan Martinez-Alier 《Journal of Cleaner Production》2010,18(6):605-606
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Meconium ileus was the presenting feature of cystic fibrosis in 46 per cent of the couples which have been referred for prenatal diagnosis. In fetuses which have been aborted on the basis of alkaline phosphatase isoenzymes assays, meconium ileus represented the only pathological feature of cystic fibrosis, and was observed in three fourths of the cases. Real-time sonographic examination of fetuses at the time of amniocentesis was able to show an echogenic mass in the abdomen corresponding to the meconium ileus, and thus may afford a complementary means of diagnosis. 相似文献
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Eco-design in innovation driven companies: perception, predictions and the main drivers of integration. The Spanish example 总被引:1,自引:0,他引:1
Maria SantolariaAuthor Vitae Jordi Oliver-SolàAuthor Vitae Carles M. GasolAuthor Vitae Tito Morales-PinzónAuthor Vitae Joan RieradevallAuthor Vitae 《Journal of Cleaner Production》2011,19(12):1315-1323
This study attempts to contribute to the scarce knowledge on how eco-design, and to broad extent sustainability, is connected to innovation driven companies. In particular, this cross sectional research verifies i) perception and knowledge of eco-design of the professionals from innovation driven companies in Spain, ii) specific eco-design strategies towards sustainability that innovation driven companies are integrating in their strategic plans and their application in the supply chain and iii) the companies’ future predictions on innovation and eco-design linkage. The methodology of this paper is based on a survey, developed defining measurable proxies for both eco-design and innovation approaches and conducted on 10,000 multidisciplinary professionals from Spanish innovation driven companies. The study shows that sustainability is a cardinal driver for innovation and that responses have specificities regarding company size, activity or respondent position. Innovation and eco-design strategies for the future aim to use materials with a lower environmental impact and to develop new concepts. 相似文献
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The physical basis of aircraft noise was described in Part I which appeared in No. 6/1977. In the present part, we discuss the existing means for control of aircraft noise, together with the success already realized and to be expected. 相似文献