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Efficiency of a repeated fed-batch bio-reactor with powdered active carbon for landfill leach ate treatment

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Author(s): S Jorfi | N Jaafarzadeh | R Rezaei Kalantary | Y Hashempur | M.M Mehrbani Ardakani

Journal: Journal of School of Public Health and Institute of Public Health Research
ISSN 1735-7586

Volume: 7;
Issue: 3;
Start page: 1;
Date: 2009;
Original page

Keywords: Fed-batch reactor | Landfill leach ate | PAC | Biological treatment

ABSTRACT
Background and Aim: High concentrations of organic compounds and ammonia and entry of toxic pollutants lead to a low efficiency of direct biological treatment of landfill leachate. The aim of this study was to determine the efficiency of a repeated fed-batch biological reactor with powdered active carbon (PAC) for landfill leachate treatment. "nMethods and Materials: Raw leach ate was pretreated by coagulation and flocculation processes and, then, the ammonia was removed by air stripping at a high pH, before biological treatment. The pretreated leach ate was treated bio-treated in an aeration tank by the repeated fed-batch method. Three cycles of 1×40, 5×8, and 4×10 hours were attempted in the absence and presence of 2 g PAC /L. "nResults:Results indicate that the presence of PAC increased the COD removal efficiency significantly. The initial COD effluent was 3900 mg/L. "nIts values were 169 mg/L and 622 mg/L in the presence and absence of 2 g/L PAC, respectively, for the cycle of 5×8 h."nConclusion: Based on the results of this study and findings of other investogations in this field, it can be concluded that repeated fed-batch bio-reactor has is quite effective for treatment of pretreated leachate.

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Tangokurs Rapperswil-Jona

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