title: Removal of chromium and lead by a sulfate-reducing consortium using peat moss as carbon source.
abstract: The effect of pre-treated peat moss on the ability of a sulfate-reducing microbial consortium to remove chromium and lead in solution was evaluated. The most active bacterial community (235.7 mmol H2S/g VSS) was selected from among eight consortia. The peat moss was pre-treated with different HCl concentrations and contact times. The best combination of treatments was 20% HCl for 10 min. The constant substrate affinity Ks was 740 mg COD/L and the ratio COD/SO4(2-) was 0.71. At pH 5, higher production of biogenic sulfide was observed. The up-flowpacked bed bioreactor operated at a flow of 8.3 mL/min for 180 h to obtain removal efficiency (by sulfate-reducing activity) of 90% lead and 65% chromium. It is important to consider that peat moss is a natural adsorbent that further influences the removal efficiency of metal ions.
authors.affiliation: Instituto de Biotecnología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Mexico.
authors.forename: Julia Mariana
authors.initials: JM
authors.lastname: Márquez-Reyes
authors.forename: Ulrico Javier
authors.initials: UJ
authors.lastname: López-Chuken
authors.forename: Arcadio
authors.initials: A
authors.lastname: Valdez-González
authors.forename: Hugo Alberto
authors.initials: HA
authors.lastname: Luna-Olvera
mesh_terms: D001419:Bacteria / Q000302:isolation & purification / Q000378:metabolism; D001673:Biodegradation, Environmental / Q000187:drug effects; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000494:pharmacology*; D002857:Chromium / Q000302:isolation & purification*; D006851:Hydrochloric Acid / Q000494:pharmacology; D006862:Hydrogen Sulfide / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D059013:Microbial Consortia / Q000187:drug effects; D010084:Oxidation-Reduction / Q000187:drug effects; D012987:Soil / Q000737:chemistry; D044003:Sphagnopsida / Q000737:chemistry*; D013431:Sulfates / Q000378:metabolism*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
chemical_list: D012987:Soil; D013431:Sulfates; D014874:Water Pollutants, Chemical; D002857:Chromium; D007854:Lead; D002244:Carbon; D006851:Hydrochloric Acid; D006862:Hydrogen Sulfide
keywords: Chromium removal; Kinetic parameters; Lead removal; Peat moss; Sulfate-reducing consortium