Organoclays for Aquifer Bioremediation: Adsorption of Chlorobenzene on Organoclays and its Degradation by RHODOCOCCUS B528 |
| |
Authors: | Barbara Witthuhn Peter Klauth Timea Pernyeszi Harry Vereecken Erwin Klumpp |
| |
Institution: | (1) Institute Agrosphere, ICG IV, Research Centre Jülich, D-52425 Jülich, Germany |
| |
Abstract: | The adsorption and degradation of chlorobenzene on partially modified organoclays and by the autochthonous microorganism Rhodococcus
B528 were studied by means of the batch technique. Organoclays were prepared from Na-montmorillonite (MM) by using dodecyltrimethylammonium
(C12) and dioctadecyldimethylammonium (2C18) bromides. The degree of modification was 35 (2C18-35-MM) and 89% (C12-89-MM) of the cation exchange capacity of MM. The adsorption experiments were carried out using headspace GC. The intercalation
of chlorobenzene into the interlayers of organo-MM was detected by X-ray diffraction.
The adsorption isotherms found were of the S1 type indicating a cooperative effect. Chlorobenzene showed a higher affinity
for 2C18-35-MM than C12-89-MM, which could not only be explained by the organic carbon content. The comparison with 2,4-dichlorophenol adsorption
has implied that for the studied systems the different adsorption mechanisms are primarily governed by the different molecular
properties and not by the type of absorbent. The presence of 2C18-35-MM caused no negative effect on the investigated microorganisms and complete biodegradation of chlorobenzene was achieved
without desorption limitation for growth, demonstrating the applicability of partially modified organoclays for bioremediation. |
| |
Keywords: | adsorption aquifer remediation biodegradation chlorobenzene 2 4-dichlorophenol partially modified organoclay |
本文献已被 SpringerLink 等数据库收录! |