Abstract
The article investigated the effects of ultrasound pretreatment on biological treatment of landfill leachate. Leachates with and without conditioning were combined with municipal wastewater at different ratios. The study showed that the implementation of a pretreatment step prior to biological treatment not only results in higher pollutant removal efficiency but may also allow for an increased leachate volume share in the influent stream entering the reactor by up to 20% (quality of effluents meets national regulation requirements) which in scenarios without pretreatment cannot exceed 5% due to poor quality of the effluents.
Highlights
One of the most serious environmental problems associated with disposal of municipal solid waste is the generation of landfill leachate
As shown in the extended review written by Renou et al [4], the positive impact of advanced oxidation processes (AOPs) on BOD5/chemical oxygen demand (COD) ratio has been reported in many studies
Chou et al [17] reported that BOD5/COD ratio increased with elongation of microwave oxidation time from 0.05 for the control sample to 0.12 for the longest time which was investigated by these Authors
Summary
One of the most serious environmental problems associated with disposal of municipal solid waste is the generation of landfill leachate. Its composition and amount depends on many factors some of them being: (a) the type and amount of waste deposited and the degree of their grinding;. Based on the nature of the incorporated processes methods of leachate treatment can be grouped as conventional and advanced treatments, as done by Renou et al [4]. The main conventional landfill leachate treatments include: (a) biodegradation (via aerobic and/or anaerobic processes); (b) chemical and physical methods such as: adsorption, coagulation, sedimentation/flotation, chemical oxidation, coagulation/flocculation, chemical precipitation as well as air stripping; (c) co-treatment of leachate with other wastewaters such as municipal in wastewater treatment plants. Whereas membrane technologies as well as technologies based on advanced oxidation processes (AOPs) are regarded as potential alternatives for leachate treatment (advanced treatments)
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