Bacterial amelioration of bauxite residue waste of industrial alumina plants

Citation
Mk. Hamdy et Fs. Williams, Bacterial amelioration of bauxite residue waste of industrial alumina plants, J IND MIC B, 27(4), 2001, pp. 228-233
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Biotecnology & Applied Microbiology",Microbiology
Journal title
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
ISSN journal
1367-5435 → ACNP
Volume
27
Issue
4
Year of publication
2001
Pages
228 - 233
Database
ISI
SICI code
1367-5435(200110)27:4<228:BAOBRW>2.0.ZU;2-V
Abstract
The high alkali content of bauxite residue deposits from, alumina productio n plants in industrial nations poses a challenge to reestablish flora and f auna at the deposit sites. The present study demonstrated that low levels o f injured! bacterial cells in the bauxite residue actively grew using vario us added nutrients and/or hay. The organisms grew from less than 10 to more than 10(9) cells g(-1) bauxite residue and formed organic acids that lower ed the pH from 13 to about 7.0. A total of 150 cultures was isolated from t reated bauxite residue and included species of Bacillus, Lactobacillus, Leu conostoc, Micrococcus, Staphylococcus, Pseudomonas, Flavobacterium and Ente robacter. Scanning electron micrographs demonstrated that untreated particl es (control) of the bauxite residue were clumped together, and in treated b auxite residue these particles were highly dispersed with microcolonial str uctures. Furthermore, the treated bauxite residue supported growth of sever al plants and earthworms that survived for over 300 days. In a test plot bi oremediation on a residue deposit at Alcoa Point Comfort, TX, the Bermuda g rass hay used was effective mulch material and encouraged water filtration, leading to establishment and growth of salt-tolerant vegetative species.