Assessment of anaerobic sewage sludge quality for agricultural application after metal bioleaching

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorVillar, L. D.
dc.creatorGarcia, O.
dc.date2014-05-27T11:20:56Z
dc.date2016-10-25T18:19:02Z
dc.date2014-05-27T11:20:56Z
dc.date2016-10-25T18:19:02Z
dc.date2003-12-01
dc.date.accessioned2017-04-06T01:07:13Z
dc.date.available2017-04-06T01:07:13Z
dc.identifierEnvironmental Technology, v. 24, n. 12, p. 1553-1559, 2003.
dc.identifier0959-3330
dc.identifierhttp://hdl.handle.net/11449/67486
dc.identifierhttp://acervodigital.unesp.br/handle/11449/67486
dc.identifier10.1080/09593330309385701
dc.identifierWOS:000220147800012
dc.identifier2-s2.0-1042268907
dc.identifierhttp://dx.doi.org/10.1080/09593330309385701
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/888925
dc.descriptionThe effects of metal bioleaching on nutrient solubilization, especially nitrogen and phosphorous, from anaerobically-digested sewage sludge were investigated in this work. The assessment of the sanitary quality of the anaerobic sludge after bioleaching was also carried out by enumerating indicator (total coliforms, fecal coliforms, and fecal streptococci) and total heterotrophic bacteria. The experiments of bioleaching were performed using indigenous sulphur-oxidizing bacteria (Thiobacillus spp.) as inoculum and samples of anaerobically-digested sludge. Nitrogen and phosphorous solubilization from sewage sludge was assessed by measuring, respectively, the concentration of Total Kjeldahl Nitrogen, ammonia, nitrate/nitrite, and soluble and total phosphorous before and after the bioleaching assays. At the end of the experiment, after 4 days of incubation (final pH of 1.4), the following metal solubilization yields were obtained: zinc, 91%; nickel, 87%; copper, 79%; lead, 52%; and chromium, 42%. As a result of sludge acidification, the viable counts of selected indicator bacteria were decreased to below the detection limit (4 × 103 cfu 100 ml-1), followed by an increase in the mineral fraction of nitrogen (from 6 to 10%) and in the soluble fraction of phosphorous (from 15 to 30%). Although some loss of sludge nutrients can occur during solid-liquid separation following bioleaching, its beneficial effects as metal removal and reduction of pathogenic bacteria are sufficient to consider the potential of this treatment before sludge disposal onto agricultural fields.
dc.languageeng
dc.relationEnvironmental Technology
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectBacterial leaching
dc.subjectBiosolids
dc.subjectNutrient solubilization
dc.subjectPathogenic bacteria
dc.subjectSewage sludge
dc.subjectammonia
dc.subjectchromium
dc.subjectcopper
dc.subjectlead
dc.subjectmetal
dc.subjectnickel
dc.subjectnitrate
dc.subjectnitrite
dc.subjectnitrogen
dc.subjectphosphorus
dc.subjectzinc
dc.subjectbiosolid
dc.subjectacidification
dc.subjectagricultural management
dc.subjectanaerobic metabolism
dc.subjectcalculation
dc.subjectcoliform bacterium
dc.subjectconcentration (parameters)
dc.subjectcontrolled study
dc.subjectfeces microflora
dc.subjectincubation time
dc.subjectleaching
dc.subjectmeasurement
dc.subjectnonhuman
dc.subjectnutrient
dc.subjectpH
dc.subjectsanitation
dc.subjectseparation technique
dc.subjectsludge disposal
dc.subjectsolubilization
dc.subjectStreptococcus
dc.subjectsulfur bacterium
dc.subjectThiobacillus
dc.subjectAgriculture
dc.subjectBacteria
dc.subjectBacteria, Anaerobic
dc.subjectConservation of Natural Resources
dc.subjectFertilizers
dc.subjectMetals, Heavy
dc.subjectNitrogen
dc.subjectPhosphorus
dc.subjectSewage
dc.subjectSolubility
dc.subjectWaste Disposal, Fluid
dc.subjectBacteria (microorganisms)
dc.titleAssessment of anaerobic sewage sludge quality for agricultural application after metal bioleaching
dc.typeOtro


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