The generalresearchconceptsforfield-studieson the behaviourof organicchemicalsin mechanical-biologicalwastewatertreat-mentare explained.Enrichmentof LASin sewagesludgeinthe rangeof severalg LASper kg dry sludgeis reported.Thefateof LAShas beenstudiedin full-scalemechanical-biologicalsewagetreatmentplantsusingHPLCanalyses.LASwerenor-mallyeliminatedto over98%fromthe dissolvedphaseof thesewageeffluents,but about25%wereremovedwiththe solidsduringprimaryclarification.No significantLASremovaloc-curredin the anaerobicsludgedigester.Particularlyinvestigat-ed werethe distributionof LASbetweendissolvedand particu-late phasesanddiurnalvariationsof primaryandsecondarysewageeffluentsof activatedsludgetreatment.In an experi-mentalplotof sludge-treatedsoil,residuallevelsof 5 mg LASper kg dry soil wereobservedone yearafterthe last applicationof sewagesludge.It is emphasizedthatthe assessmentof theecologicalimpactof theseresidualcontaminationsis verydiffi-cult.
Behaviour of LAS in Sewage and Sludge Treatment and in Sludge-Treated Soil
A. Marcomini;
1989-01-01
Abstract
The generalresearchconceptsforfield-studieson the behaviourof organicchemicalsin mechanical-biologicalwastewatertreat-mentare explained.Enrichmentof LASin sewagesludgeinthe rangeof severalg LASper kg dry sludgeis reported.Thefateof LAShas beenstudiedin full-scalemechanical-biologicalsewagetreatmentplantsusingHPLCanalyses.LASwerenor-mallyeliminatedto over98%fromthe dissolvedphaseof thesewageeffluents,but about25%wereremovedwiththe solidsduringprimaryclarification.No significantLASremovaloc-curredin the anaerobicsludgedigester.Particularlyinvestigat-ed werethe distributionof LASbetweendissolvedand particu-late phasesanddiurnalvariationsof primaryandsecondarysewageeffluentsof activatedsludgetreatment.In an experi-mentalplotof sludge-treatedsoil,residuallevelsof 5 mg LASper kg dry soil wereobservedone yearafterthe last applicationof sewagesludge.It is emphasizedthatthe assessmentof theecologicalimpactof theseresidualcontaminationsis verydiffi-cult.
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