Appropriate management of waste landfills is required
worldwide, including in developing countries. Early stabilization
of landfills and reduction of environmental pollution by leachate is
recognized as an important issue [1]. In most developing countries,
landfill leachate is treated in stabilization ponds [2]. Leakage or
overflow of untreated leachate to the surrounding environment is a
concern, with large volumes of landfill leachate being produced by
extensive landfill areas with high seasonal rainfall. Leachate
recirculation in landfill bodies is an attractive technology that can
reduce the volume of leachate and attenuate pollutants in the
leachate by degradation in the landfill body [3,4]. Leachate
recirculation is a process known to enhance the biodegradation
of organics in waste and leachate, especially in arid regions, since it
contributes moisture and extends the retention time [1,5–7].
Recently, a decrease in the biodegradation rate in the dry season in
the tropics was reported [8], and Sanphoti et al. [9] reported that
leachate recirculation with supplemental water enhanced stabilization
in a simulated landfill reactor in a tropical region. In this
context, leachate recirculation in waste landfills in tropical regions
might improve both the handling of leachate in the rainy season
and enhance the degradation of wastes in the dry season