title: [The effect of various iron hydroxide concentrations on the anaerobic fermentation of sulfate-containing model sewage].
abstract: The addition of iron hydroxide and iron-reducing bacteria into a fermenter for anaerobic processing of sulfate-containing sewage was shown to decrease sulfate reduction and sulfide concentration, while increasing the total organic carbon (TOC) and methane production. The effect of iron (III) in sulfate-containing sewage depended on its dose, which can be expressed as molar ratio Fe(III)/SO4(2-). Sulfide concentration increased monotonically, reaching 91 mg/l and 45 mg/l after 15 days of processing at Fe(III)/SO4(2-) ratios of 0.06 and 0.5, respectively. However, soluble sulfide production was not observed at ratios equaling 1 and 2. At ratios of 0.06, 0.5, 1, and 2, the maximum rates of TOC removal were 0.75, 1.15, 1.39, and 1.55 g TOC/g of organic matter (OM) per 1 h. Methane production rates were 0.039, 0.047, 0.064, and 0.069 mg/g OM per 1 h, with the mean relative amounts of methane in the biogas being equal to 25, 41, 55, and 62%, respectively. These data can be applied to the development of new methods of anaerobic purification of sulfate-containing sewage.
authors.forename: V P
authors.initials: VP
authors.lastname: Stabnikov
authors.forename: V N
authors.initials: VN
authors.lastname: Ivanov
mesh_terms: D001673:Biodegradation, Environmental; D004305:Dose-Response Relationship, Drug; D005290:Ferric Compounds / Q000378:metabolism* / Q000494:pharmacology; D013461:Sulfur Oxides / Q000378:metabolism* / Q000494:pharmacology; D014865:Waste Disposal, Fluid; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D005290:Ferric Compounds; D013461:Sulfur Oxides; D014874:Water Pollutants, Chemical; C021024:ferric hydroxide