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Quy mô lớn, các thí nghiệm đồng ruộng đã được tiến hành để loại bỏ asen trong nước ngầm của một nằm ở Guanajuato, Mexico khu vực sử dụng không cố định sinh khối lúa miến (NISB) như là một chất hấp thụ, được tìm thấy có hiệu quả cao để hấp thụ trong các thí nghiệm trong phòng thí nghiệm trước đây. Các cột được chạy dưới trọng lực và các điều kiện dòng chảy bơm. | Natural Arsenic in Groundwater Occurrence Remediation and Management -Bundschuh Bhattacharya and Chandrasekharam eds 2005 Taylor Francis Group London ISBN 04 1536 700 X Sorption of arsenic on sorghum biomass a case study Nazmul Haque Greg Morrison Gustavo Perrusquía Water Environment Transport Chalmers University ofTechnology Goteborg Sweden Irene Cano-Aguilera Alberto F. Aguilera-Alvarado Moisés Gutierrez-Valtierra Facultad de Química Universidad de Guanajuato Guanajuato Gto. Mexico ABSTRACT Large scale field experiments were conducted for the removal of arsenic from the groundwater of a well located in Guanajuato Mexico region using non-immobilized sorghum biomass NISB as a sorbent which was found highly efficient to adsorb As in previous laboratory experiments. The columns were run under gravity and pump flow conditions. Removal of arsenic under pump flow was slightly higher than the gravity flow due to the steady-state flow conditions. The maximum arsenic accumulation measured was 3.2 and 3.3 mg ofAs g of NISB for gravity and pump flow conditions respectively. To determine the optimal hydraulic detention time columns were operated under different flow rates and the maximum sorption occurred at a flow rate of 10mL min. Columns of different dimensions were run to obtain the optimal design parameter between surface loading and volumetric loading of the system. The optimal sorption condition can be achieved through the volumetric design of the system. 1 INTRODUCTION Mining and textile activities can greatly affect the quality of the local groundwater Bowell et al. 1994 Gray 1997 Rosner 1998 . It is more severe in semi-arid lands where groundwater is the only source of drinking water. High arsenic concentrations in surface and groundwater are recognized to be a problem in mining and textile areas Gough et al. 1979 . It is also recognized that there are potential health consequences for the local population when exposed to drinking water with high arsenic content .
