One of our patented methods (registration number 0468999, issued by the Korean Intellectual Property Office on January 20, 2005) evaporates and transpires wastewater from the landfill to the atmosphere by using the metabolism of plants rather than by discharging it to nearby surroundings. When the landfill stops operation, KBEC will put final soil cover and plant fast-growing trees in a tree-farm zone. Trees act to purify leachate and reduce the need for additional sewage treatment systems. We also recirculate leachate inside the waste pile. Through recirculation, biochemical reaction and decomposition in the landfill can be accelerated, leachate purification proceeds more rapidly, and the landfill space can be expanded through fast stabilization and settlement. Such measures will result in a reduction in post-control costs and long-term hazards. Underground bioreactor (UGBR) produces composts and accelerates decomposition by anaerobic and aerobic treatment of wastes. In both anaerobic and aerobic bioreactors, methane production is accelerated, and the toxicity of leachate and methane is minimized.
Wastewater treatment (Leachate Treatment)
Wastewater treatment system at a landfill can be used at a general sewage plant, too. Landfill leachate is highly toxic wastewater. Leachate, after being collected, needs to be monitored for biochemical oxygen demand (BOD), concentration, and other properties, before it goes through sedimentation, filtration, and adsorption. Through thermal hydrolysis, KBEC can also dehydrate and reduce contaminants more effectively. Our wastewater remediation thus can be applied at water plants in Gran Asuncion and other regions in Paraguay, too.
Vegetation belt
Building a vegetation and irrigation belt on top of waste pile requires specific techniques as to moisture content, type of trees to be planted, and water recovery and extraction. KBEC built vegetation belt at the Ba Ria, VungTau landfill in Vietnam in 2012, and the site was recreated as anwooded area.
Storm water redirection and drainage
The first step of leachate management is to minimize the amount of rainfall on waste pile. Storm water also needs to be redirected for stability of landfill slopes. KBEC placed gutters throughout a landfill to direct flow of rainwater. After a landfill is sealed with a final cover, storm water runoff is managed as rainwater, not as leachate.
KBEC Korea
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