Precipitation and recovery of metal sulfides from metal containing acidic wastewater in a sulfidogenic down-flow fluidized bed reactor

This study reports the feasibility of recovering metal precipitates from a synthetic acidic wastewater containing ethanol, Fe, Zn, and Cd at an organic loading rate of 2.5 g COD/L-day and a COD to sulfate ratio of 0.8 in a sulfate reducing down-flow fluidized bed reactor. The metals were added at increasing loading rates: Fe from 104 to 320 mg/L-day, Zn from 20 to 220 mg/L-day, and Cd from 5 to 20 mg/L-day. The maximum COD and sulfate removals attained were 54% and 41%, respectively. The biofilm reactor was operated at pH as low as 5.0 with stable performance, and no adverse effect over COD consumption or sulfide production was observed. The metals precipitation efficiencies obtained for Fe, Zn, and Cd exceeded 99.7%, 99.3%, and 99.4%, respectively. The total recovered precipitate was estimated to be 90% of the theoretical mass expected as metal sulfides. The precipitate was mainly recovered from the bottom of the reactor and the equalizer. The analysis of the precipitates showed the presence of pyrite (FeS2), sphalerite (ZnS) and greenockite (CdS); no metal hydroxides or carbonates in crystalline phases were identified. This study is the first in reporting the feasibility to recover metal sulfides separated from the biomass in a sulfate reducing process in one stage.

Medienart:

E-Artikel

Erscheinungsjahr:

2009

Erschienen:

2009

Enthalten in:

Zur Gesamtaufnahme - volume:102

Enthalten in:

Biotechnology and bioengineering - 102(2009), 1 vom: 01. Jan., Seite 91-9

Sprache:

Englisch

Beteiligte Personen:

Gallegos-Garcia, Marisol [VerfasserIn]
Celis, Lourdes B [VerfasserIn]
Rangel-Méndez, René [VerfasserIn]
Razo-Flores, Elías [VerfasserIn]

Links:

Volltext

Themen:

132N09W4PR
3K9958V90M
E1UOL152H7
Ethanol
Iron
Journal Article
KPS085631O
Metals
Pyrite
Research Support, Non-U.S. Gov't
Sulfides
Water Pollutants, Chemical
Zinc Compounds
Zinc sulfide

Anmerkungen:

Date Completed 22.12.2008

Date Revised 24.11.2016

published: Print

Citation Status MEDLINE

doi:

10.1002/bit.22049

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM182945553