共查询到20条相似文献,搜索用时 46 毫秒
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含铬废水治理技术的应用 总被引:4,自引:0,他引:4
介绍目前比较常用的含铬废水的种种治理技术。含铬废水的治理技术种类繁多,各有利弊。国外对表面处理废水90%以上使用化学法治理。我国对表面处理的废水治理,在走了一段弯路后,逐渐找到了方向,也以采用化学法处理为主。 相似文献
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利用废铁屑处理含铬废水试验研究 总被引:7,自引:0,他引:7
通过研究在酸性条件下利用废铁屑处理剧毒的六价铬电镀废水的工艺条件 ,在最佳条件下废水中六价铬去除率达99 %以上 ,出水总铬含量为0.040mg/l,六价铬含量为0.002mg/l,大大低于国家排放标准0.500mg/l。 相似文献
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利用煤吸附处理含铬废水及生活污水的试验研究 总被引:4,自引:0,他引:4
本文研究了四川白皎无烟煤用于生活污水、含铬废水和乐果生产废水的处理。在静态条件下,煤对生活污水中的COD去除率为12%;对乐果生产废水的脱色率大于638%;在含铬工业废水在浓度为3526×10-5mol·dm-3时Cr(VI)的去除率为90%左右。考察了固液比、温度、浓度和酸度等对煤吸附Cr(VI)的影响,并发现吸附量q与时间t之间遵从如下的定量关系:q=47685(1+21256t)-1或q=21351[1-exp(-05016t)]03838 相似文献
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M. Bundgaard-Nielsen C. L. Hwang 《Journal of the American Water Resources Association》1975,11(4):805-810
ABSTRACT: The interaction between the level of taxation and the firms accruing choice of treatment technology is discussed. It is shown that there is a risk of overtaxation, that is, simply increasing taxation may fail to improve environmental quality but only increase production costs and thus consumer prices. 相似文献
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Michael I. Muiga George W. Reid 《Journal of the American Water Resources Association》1979,15(3):838-852
ABSTRACT: Mathematical modeling techniques are used to develop predictive equations for cost of water and waste water treatment processes in developing countries utilizing socioeconomic, environmental, and technological indicators. Predictive equations are developed for each of the three regions (Africa, Asia, and Latin America) for construction, operation, and maintenance costs of slow sand filter, rapid sand filter, stabilization lagoon, aerated lagoon, activated sludge, and trickling filter. Data analysis indicated that cost of water treatment processes is a function of technological indicator (percentage of imported materials), population, and the design capacity. The variables which gave the best correlation for waste water treatment cost were population, design flow, and the percentage of imported waste water disposal materials. 相似文献
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ABSTRACT. There have been many changes in the waste water treatment requirements at St. Louis District Corps of Engineers projects over the past few years. Discussed are the methods considered for treating these wastes. Extended aeration plant, followed by filtration, is the process used in most of the areas. The treatment plant operators have become key members of the project operation team. A discussion of the Districts operator training program is presented along with the operator's job requirements. Through a Spring inspection of all treatment plants in the District, a mechanism has been provided for encouraging feedback to the design engineer from the operator. 相似文献
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James D. Womack J. Clement Burdkick Floyd C. Larson 《Journal of the American Water Resources Association》1973,9(1):100-115
ABSTRACT. As a result of several investigations conducted in the Department of Civil Engineering through the Water Resources Research Center at The University of Tennessee, dating from 1966 to the present, a rather comprehensive surveillance of water quality conditions has been maintained in Forth Loudoun Reservoir on the Tennessee River near Knowville, Tennessee. During the period covered by these investigations, the Knoxville Third Creek Sewage Treatment Plant was upgraded from a primary plant to a secondary (activated sludge) treatment plant. Comparison of the collected data is being undertaken herein to elucidate the impact of these modifications upon water quality conditions in the reservoir. Consideration is given to the improvements of water quality as related to the expenditure for modification of the treatment facilities. In addition, comment is directed toward the public health significance of the water quality conditions determined. 相似文献
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About one third of the area of Turkey is underlain by carbonate rocks that are relatively soluble, and this has produced large areas of karst in the country. The economic implications of karst hydrology in Turkey are immense, considering its effects on water resource development. An ongoing project in Turkey, assisted by the United Nations, is undertaking a comprehensive and interrelated approach to solving hydrogeological problems in a karst polygon region of over 13,000 km2. The area chosen for this project has one of the most complex karst circulation systems, not only in Turkey, but probably in the entire Mediterranean basin. Demand for water in this polygon region is high. The project personnel have applied both the classical methods, such as geological mapping, geophysical research, aerial photo interpretation, drilling, and observation of piezometric boreholes to the problem, as well as more modern techniques such as quantitative fluorometry, processing of remotely sensed data, time bombs and environmental isotopes. Several examples of applied methods and of results obtained are presented. Un tiers environ de la surface de la Turquie recouvre des roches carbonatées relativement solubles où se sont formés des systèmes karstiques très étendus. Les implications économiques de l'hydrologie des karsts en Turquie sont considérables si on considère ses effets sur l'aménagement des ressources en eau. Dans un projet en Turquie, exécuté avec l'assistance des Nations Unies, une approche compréhensive et intégrée est en cours en vue de résoudre des problèmes hydrogéologiques dans un polygone karstique de plus de 13.000 km2. La zone choisie pour ce projet possède l'un des systèmes de circulation karstique les plus complexes qui existent non seulement en Turquie mais probablement dans tout le bassin méditerranéen. Dans ce polygone, la demande d'eau est très élevée. Pour étudier ce problème, le personnel du projet a appliqué deux méthodes classiques comprenant la cartographie géologique, l'exploration géophysique, l'interprétation photoaérienne, les sondages, l'observation des tubes piézométriques et des techniques plus modernes telles que la fluorémetrie quantitative, le traitement des données de la télédétection, les bombes à action retardée et le dosage des isotopes. L'article discute de plusieurs méthodes utilisées et des résultats qui en ont découlé. Cerca de una tercera parte del territorio de Turquía está sobre rocas carbonatadas. Las implicancias económicas de hidrología kárstica en Turquía son immensas si se consideran las posibilidades de desarrollo de sus recursos hidrológicos. En un proyecto en ejecución bajo la asistencia de las Naciones Unidas en Turquía se está haciendo un enfoque integral de la solución de los problemas hidrológicos en una región poligonal kárstica de mas de 13,000 km2. Esta región tiene uno de los sistemas mas complejos de circulación kárstica de no solamente de Turquía sino también probablemente de Mediterraneo. La demanda de agua en este polígono kárstico es muy alta. En el proyecto se está aplicando tanto los métodos geológicos, investigación geofisica, interpretación de fotografia área, perforación, y observación de sondajes piezométricos, asi como también técnicas modernas tales como fluorometría cuantitativa, procesamiento de datos obtenidos por satélite, bombas de acción retardada e isótopos de medio ambiente. Varios ejemplos de los métodos aplicados y de los resultados obtenidos se presentan a este artículo. 相似文献
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William W. Simpkins Michael R. Burkart Martin F. Helmke Trenton N. Twedt David E. James Robert J. Jaquis Kevin J. Cole 《Journal of the American Water Resources Association》2002,38(3):759-771
ABSTRACT: Earthen waste storage structures (EWSS) associated with large confined (concentrated) animal feeding operations (CAFOs) were evaluated for their potential to impact water resources in Iowa. A representative sample of 34 EWSS from a digital database of 439 lagoons and basins permitted between 1987 and 1994 was analyzed. Eighteen percent (6 of 34) directly overlie alluvial aquifers that are used widely for potable water supply. Ninety‐four percent (29 of 31) were constructed below the water table based on EWSS depth data. At 65 percent of EWSS (22 of 34), 50 percent or more of the manure‐spreading area (MSA) has a water‐table depth less than 1.6 m. At 74 percent of EWSS (25 of 34), 90 percent or more of the MSA contains soil with vertical K exceeding 25.4 mm/hr. Seventy‐one percent (24 of 34) occur where 10 percent or less of the MSA is frequently flooded. No significant differences were found among leakage rates due to aquifer vulnerability class or surficial material. However, at least 50 percent of EWSS (14 of 28) leaked at rates significantly greater than 1.6 mm/d under the new construction standard. The estimated 5,000 unregulated CAFOs may have a greater potential to impact water resources in Iowa. 相似文献
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Carl D. Settergren Larry C. Tennyson 《Journal of the American Water Resources Association》1979,15(5):1353-1364
ABSTRACT: A number of criteria can be used in the selection of an area for the irrigation disposal of secondary treated waste water. The inherent capacity of the surface soil to retain, or at least detain, the various nutrient ions passing through the profile in the percolating waters becomes the prime consideration in regions with shallow water tables or in Karst areas such as the Missouri Ozarks where the risk of ground water supply contamination is high. A comprehensive study of the nutrient renovation potential of several soils was undertaken at a proposed effluent irrigation site along the Ozark National Scenic Riverways in south central Missouri. The surface soil hydrology was evaluated employing selected soil water parameters. Exchange equilibria studies determined the retention capacity for Ca and Mg while the concentrations of other selected ions were analyzed in the soil water to measure their retention time and net removal. The movement of a bromine tracer was monitored as an index of the renovation capacity of these soils for the more mobile anions such as nitrate. Neutron activation analysis proved to be a useful tool in the water quality analyses. All surface soil profiles demonstrated some degree of nutrient renovation for the various nutrients studied. 相似文献
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Donald J. Epp C. Edwin Young 《Journal of the American Water Resources Association》1981,17(2):215-224
ABSTRACT: Varying treatment levels to meet seasonal variation in assimilative capacity of streams can reduce total costs of treatment. A mathematical model of a Pennsylvania stream based on a theoretically sound approximation of the physical relationships underlying the distribution of DO in a river system was used to determine discharge constraints for an economic optimization model which produced estimates of sewage treatment cost savings. Increasing the number of flow periods during the year enhances cost reducing opportunities even when land application processes are considered. Also, the least cost treatment process for year around operation may not be the least costly under multiple flow period management. 相似文献