Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

Abstract

Abstract:Municipal solid waste final disposal represents an environmental burden worldwide since landfilling, or open dumping, is still the preferred solution for the end of life of solid discarded materials. This study aims to review the technological innovations applied for landfill leachate treatment, taking into consideration the experiences obtained during the past years and the solutions which have been implemented. The review showed that both biological and physiochemical treatments are not able to achieve the requested water quality level, according to the limits established by regulations, whether applied in a single treatment or multiple treatments. In order to respect sustainable release limits to guarantee environmental protection, the construction of depuration systems and combining biological and physiochemical treatment methods is considered of the utmost importance. The review looks at possible joint applications of different treatment techniques reviewed by other studies and considers the state of the art of current research. Combined technical solutions suggested within the 2016 peer-reviewed papers are presented and discussed as a sustainable way to effectively treat landfill leachate, giving particular attention to feasible solutions for developing countries.

Social Surveys about Solid Waste Management within Higher Education Institutes: A Comparison

“…Since final disposal is viewed as a secondary actor in the future scenarios of municipal solid waste (MSW) [4], nations' key policies are introducing concepts as reduce, reuse, and recycle (3Rs), integrated management, and industrial ecology, in developed [5] as in emerging countries [6]. The improvement of 3R principles within the community can reduce the usage of land for waste disposal, decreasing expenditure on SWM and minimizing the generation of waste [7], at the same time improving the useful life and the environmental sustainability of the final disposal sites [8]. The implementation of this approach has not been currently developed in the majority of low income countries due to development as implemented in other realities [38].…”

Bioremediation of Landfill Leachate Using Isolated Bacterial Strains

“…In addition, high concentrations of ammonia can persist for up to 50 years after landfill decommission [10,45] and can decrease the effectiveness of biological treatments such as those employed in wastewater treatment plants (WWTPs) [46,47]. The leachate used in this study recorded an ammonia level range between 790-1010 mg.l -1 (Table 1), these high levels correspond to methanogenic phase [48,49,50]. High levels of ammonia, can impact on biological treatment, resulting in low removal levels for both BOD and COD.…”

Treatment of Landfill Leachate Using Ultrasound Assisted SBR Reactor

“…SBR-Sequencing batch reactors, AS-Activated sludge system, SCFB-Semi-continuously fed batch, CF-Continuous-flow activated sludges with recycle. 1) before air pretreatment; 2) for soluble chemical oxygen demand (SCOD); 3) for the total ammoniacal nitrogen (TAN); 4) Effluent from the Fenton process was mix with municipal sewage wastewater Table A4. Characteristic of effluents (the highlighted text indicates the limit value given by Polish legislation; the values marked light grey and dark grey (with white font)) are for the control reactor and reactors fed with mixtures with pretreated leachate, respectively).…”

“…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; (b) climate conditions, including the volume and frequency of precipitation, air humidity, as well as evaporation rate; (c) age of the landfill; (d) storing technology, and therefore the degree of waste compaction as well as the method of sealing the landfill; (e) humidity of waste; (f) volume of precipitation infiltrating through the bed; (g) geomorphology and topography of the area where the landfill is located; (h) the lifetime of the landfill; (i) reclamation and the type of vegetation covering the top of the landfill after its shutdown; (j) the runoff direction of rainwater and snowmelt [1][2][3].…”