+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Assessing the suitability of soils with macro pores for subsurface liquid waste disposal

, : Assessing the suitability of soils with macro pores for subsurface liquid waste disposal. Journal of Environmental Quality 12(3): 305-311

The capacity of soils to accept and purify liquid waste can be manipulated by using different application regimens. The associated transient soil physical conditions which govern purification processes were measured experimentally in soil columns and in situ, and were predicted by simulation in 3 soils of which 2 had macropores. Measurements of pressure heads, outflow rates and breakthrough curves were made following intermittent liquid applications of 2 cm/day. Rapid breakthrough and short-circuiting, which were observed in the soils with the macropores, were reduced by adding a light crust. Predictions involved computer simulation of pressure heads during infiltration and redistribution, and of outflow rates in the columns. Good agreement was found between measured and calculated values, but only when the model for soils with macropores was modified to include a subprogram for macropore flow. Simulation required hydraulic conductivity at and near saturation, which was obtained with a modified crust test procedure. Use of the simulation program allowed the prediction of soil physical conditions for a range of application rates in terms of ponding times and drainage rates, which affect purification and clogging. Measurement of breakthrough curves yielded travel times as a function of application rates. Optimal application rates can be estimated by considering these 2 types of data, as is illustrated with an example. This approach is preferred over the current procedure using a single hydraulic parameter.


Other references

Gamble, J.G.; Dickens, C., 1999: Death by spontaneous combustion: Charles Dickens and the strange case of Mr. Krook. Pharos of Alpha Omega Alpha-Honor Medical Society. Alpha Omega Alpha 62(2): 11-15

Robinson W.H., 1971: Diptera associated with galls on elms d ulmus d spp. Virginia Journal of Science 22(3): 100

Xue, L-Xi.; Jiang, M.; Xie, L-Qian.; Ruan, C-Geng., 2016: The effect of bortezomib on migration of endothelial cells and angiogenesis. To investigate the effects of bortezomib on the migration of endothelial cells and the expression of angiogenesis-related molecules, and explore the mechanism of its antiproliferation of tumor cells. Cell count kit CCK-8 was used to detect the rel...

Clark, F.; Farrell, J.; Hill, L.A., 1994: A study of a population of the House Martin feather louse Bruelia gracilis Nitzsch. The population structure of Bruelia gracilis was studied by de-lousing house martins during their breeding season. The results showed that the population of B. gracilis conformed to a negative binomial distribution which agreed with results from s...

Biglioli, P.; Ripamonti, M., 1978: A case of stenosis of the supradiaphragmatic inferior vena cava. Minerva Cardioangiologica 26(10): 683-686

Garrido-Lestache Y Cabrera, J., 1952: New concepts in surgical indications in acute and chronic appendicitis in children. Acta Pediatrica Espanola 10(116): 216-224

Muntener, M.; Kaser, L.; Weber, J.; Berchtold, M.W., 1995: Increase of muscle relaxation speed by direct injection of parvalbumin cDNA. Experientia (Basel) 51(ABSTR ): A53

Kakimoto, S.; Yushita, Y.; Sanefuji, T.; Kondo, A.; Fujishima, N.; Kishikawa, M.; Matsumoto, K., 1986: Non-hormonal adrenocortical adenoma with oncocytoma-like appearances. We report a case of non-hormonal adrenocortical adenoma. The tumor was removed en block with the adrenal gland. The specimen was 5.0 X 4.5 X 3.0 cm, weighed 30 g and was solid. Histologically, this tumor had an oncocytoma-like appearance. However,...

Gomori, P., 1949: On the function of the vas afferens and vas efferens. The vas efferens has special significance in the regulation of glomerular filtration. On excitation of the sympathetic nervous system (its constrictor) it narrows considerably more than does the vas afferens. On inhibition of the sympathetic nervo...

Catalyurek, H.; Karabay, O.; Silistreli, E.; Acikel, U., 2002: Transthoracic colour Doppler ultrasonography in the evaluation of internal thoracic artery bypass graft patency. The internal thoracic artery (ITA) is the most important conduit for coronary artery bypass grafting. The quality of the anastomosis joining the ITA to the left anterior descending coronary artery has a major impact on left ventricular perfusion....