TAILIEUCHUNG - Nonequilibrium transport and sorption of organic chemicals during aquifer remediation

Organic farms extend from market gardens clustered near Australia’s big cities, to dairy farms scattered along the East Coast to vast cattle stations in the outback. But the organic industry in Australia is more than the sum of its farms. It is composed of processing facilities, logistics operations, wholesalers, retailers, exporters, certification organisations and a range of other individuals and organisations. Organic products are a small but diverse range of products—including fruit, nuts and vegetables, meat from various animals, dairy products, cereals, oilseeds, plant and animal fibres, and health and body care products. The products may look like their conventional equivalents, but differ in the way they. | Hydrological Sciences-Journal-des Sciences Hydrologiques 42 2 April 1997 245 Nonequilibrium transport and sorption of organic chemicals during aquifer remediation CORS VAN DEN BRINK TWACO Consultants for Water Environment PO Box 8064 9702 KB Groningen The Netherlands WILLEM J. ZAADNOORDIJK ĨWACƠ Consultants for Water Environment PO Box 8520 3009 AM Rotterdam The Netherlands Abstract Aquifer remediation operations are often behind schedule. Usually a rather sharp concentration decrease shortly after the start of an operation is followed by a situation in which hardly any concentration decrease is observed. Furthermore the concentration increases after stopping the groundwater recovery. These phenomena are caused by so-called tailing. An important cause of tailing is the phenomenon that equilibrium is not reached for some of the transport and sorption processes involved. To predict these effects of tailing 1WACO has developed a program SORWACO which describes the behaviour of solutes along a path line. Processes for which equilibrium is reached quickly as well as processes for which equilibrium is reached only slowly are taken into account. The program has been verified against breakthrough curves observed in column experiments reported in the literature. The program parameters were calibrated using the data of several experiments. The resulting set of parameter values accurately described the transport for different flow velocities. The fact that quite good results can be obtained without a lot of data from a specific site makes the program a valuable tool for the design of remediation operations. The program is especially useful when extensive input data are not available so that detailed three-dimensional or stochastic models cannot be applied. The use of the program is illustrated by means of a case study. The progress was monitored and the data show good correspondence with the predictions of the program. Transport et desorption differenties de produits .

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