Paper Title:
Sustainable Approach for the Immobilization of Metals in the Saturated Zone: In Situ Bioprecipitation
  Abstract

In order to remediate three sites in the vicinity of a non-ferrous industrial site, where groundwater was historically contaminated with metals, the best available technique should be selected. Because the groundwater contained high concentrations of metals and high sulphate concentrations (up to 2000 ppm), the feasibility of sulphate reduction and subsequent metal immobilization due to metal sulphide precipitation was examined in the lab before selecting an appropriate remediation technology. Because of the very high metal concentrations in the groundwater and their potential toxic effects on microbial life chemical reagents were also evaluated for immobilization of the metals in situ. The first site (site 1) was characterized by a contamination of Zn (500ppm-3ppm) up to a depth of 130 m-bg. A screening for inducibility of biological activity was performed at two depths – 30 m-bg (below ground) and 65 m-bg -- using microcosm experiments containing both aquifer solids and groundwater. Different electron-donors were selected including pure chemical agents such as lactate and waste products such as molasses and glycerol. Glycerol resulted in the most efficient metal and sulphate removal after about 106 days. Extremely high Zn concentrations were found in the groundwater of the second site (site 2), i.e., up to about 2000 ppm. Similar lab tests applied for site 1 were performed, but in addition chemical agents (NaS2 and CaSx) were used. Whereas the sulphide containing chemical agents immediately resulted in low Zn concentrations in the groundwater, it took >140 days before biological sulphate removal started. Glycerol, lactate and molasses resulted in efficient Zn removal. Site 3 was characterized by relative shallow contamination (<10 m-bg) of mainly Co (30-300 ppm), and containing typical sulphate concentrations in the range of 300-1200 ppm. Rapid microbial sulphate reduction (within 50 days) was induced in the tests containing nutrient-amended lactate, cheese whey and soy oil.

  Info
Periodical
Advanced Materials Research (Volumes 20-21)
Edited by
Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
Pages
261-266
DOI
10.4028/www.scientific.net/AMR.20-21.261
Citation
K. Vanbroekhoven, S. Van Roy, L. Diels, J. Gemoets, P. Verkaeren, L. Zeuwts, K. Feyaerts, F. van den Broeck, "Sustainable Approach for the Immobilization of Metals in the Saturated Zone: In Situ Bioprecipitation", Advanced Materials Research, Vols. 20-21, pp. 261-266, 2007
Online since
July 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Xiu Rong Zhuo, Xue Gang Luo, Xiao Yan Lin, Yan Chen, Chang Gang Xu
Abstract:TiO2 / KGM composite membranes were prepared by blend. Effects of the content of TiO2 and glycerol, ratio of PVA to KGM on tensile strength...
353
Authors: F. Battaglia-Brunet, Dominique H.R. Morin, S. Coulon, Catherine Joulian
Abstract:A process for the precipitation of trivalent arsenic sulphide in sulphate-reducing condition at low pH would be very attractive due to the...
581
Authors: Jae Ho Baek, Young Bok Ryu, Myung Hwan Kim, Myung Jun Moon, Man Sig Lee
E. Biomaterials
Abstract:We carried out a reaction in which glycerol carbonate was synthesized by using glycerol and urea. The physical properties of the prepared...
374
  | Authors: Porntippa Pinyaphong, Pensiri Sriburee
Chapter 1: Technologies in Food Processing and Pharmacology
Abstract:The objective of this research was to isolate bacteria able to utilize glycerol as carbon source and study the optimal condition of...
37