Aerobic Biological Treatment Of Landfill Leachate
Author(s)
R. J. Matthews, M. K. Winson & J. Scullion
Abstract
There is an ongoing need to treat leachates from landfills using approaches that
avoid expensive installation and operating costs. Faced with such a problem,
Powys County Council (Wales, UK) developed a treatment system based on
practical experience. Leachate was re-circulated through aeration towers
containing a biofilm supported on plastic media before being polished in
reed/filter beds.
Investigations were undertaken to evaluate the performance of these
processes. Replicated model aeration towers (1/300 site scale) were used to
establish treatment rates for pollutants in leachates of varying strengths; the
effects of temperature and variations in pollutant concentrations were also
evaluated. Data from these model experiments were corroborated with findings
from pilot-scale plants (1/10 site scale) operating on landfill sites. Assessment of
treatment performance was based on the degree of amelioration of standard
chemical (ammoniacal-N and total organic carbon) parameters. A range of
related parameters including nitrate, pH and redox potential were measured in
support of these assessments.
Model system experiments indicated treatment rates at 15 oC (883-1895 mg
NH3-N m-3 h-1; 347-1600 mg TOC m-3 h-1) that were similar across a wide range
of leachate concentrations (37-1880 mgl-1 ammoniacal-N; 130-5315 mgl-1 COD).
Marked changes in the concentration of leachates did not affect treatment
efficiency following a short lag effect. Process rates roughly halved with each
5oC decrease in temperature below 15oC, significant nitrification was maintained
at temperatures of 0.5-1 oC. High variability in treatment capacity was observed
for individual plastic media. Treatment rates in pilot scale plants were slightly
higher but broadly consistent with those obtained in model systems.
Keywords: leachate treatment, aerobic, temperature, leachate strength, biofilm.
Keywords
leachate treatment, aerobic, temperature, leachate strength, biofilm.
Related Book
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