By means of sustainable development, Eco Sud satisfies the current requirements without sacrificing the future generations’ needs. Sustainable practices involve the permanent assessment of the way in which today’s decisions will affect the society, the environment and the economy of the future. Eco Sud contributes to a better world by promoting waste reduction technologies, the creation of safer and more efficient waste disposal services and sharing accumulated knowledge with our customers and collaborators.
• Biogas collection system (subsection on the same page as sustainable development)
Upon reaching the final storage level, the cells are closed up and fitted with a biogas capturing system. The storage cell degassing activity has the purpose of preventing the release of biogas emissions into the atmosphere, emissions that may cast a negative impact upon the environment.
On the premises of Vidra Sanitary Landfill a biogas capture and energy recovery plant shall be erected. The plant shall produce electricity from burning the biogas generated by the household waste landfill. The biogas shall be collected, treated and subsequently transported to the gas turbines the generators of which produce electricity intended for delivery to the regional power grid.
The construction of this plant requires two phases:
Phase I: it involves the installation of two sets of four microturbines each; each generator connected to these microturbines shall produce around 300 kW at 400V, ensuring a total net production of 2 MW
Phase II: it involves the construction of three additional generators driven by gas turbines, each being able to produce 4500kV at 6.3 kV.
After the completion of these phases, the total net power of the plant to be delivered to the Sen power grid is 14 MW
• Leachate treatment system (subsection on the same page as sustainable development)
The efficient design of leachate treatment systems requires the knowledge of certain basic parameters, such as: the type of waste, the leachate quantity and composition, the daily volume of effluent, as well as the final parameters and the maximum values allowed by the legislation in force.
The leachate quantity is influenced by the rainfall quantity in the respective area. From a quantitative point of view, the polluting substance content of the leachate depends on the nature of waste and varies in time, in correlation with the evolution of the waste anaerobic and aerobic fermentation processes.
Taking these aspects into account, EcoSud company, relying on the experience gathered in managing sanitary landfills, has chosen a state-of-the-art leachate treatment plant, which operates on the principle of two-stage reverse osmosis.
Mention should be made of the fact that after the treatment, the pollutant concentration presents values comparable with the potability ones. The use of two-stage reverse osmosis plants provides the operator with significant advantages as opposed to other methods, taking into account operational safety, as confirmed by more than 2,000 such plants all over the world.
Our company owns several leachate treatment plants, one at Mofleni Landfill, one at Mavrodin Landfill and three at Vidra Landfill. The plants have optimal leachate flow rates, which vary between 5 m3/h and 8 m3/h, depending on the needs of each landfill.
The plants have operating pressures between 30 and 65 bar, contain modular parts of the treatment phase (reverse osmosis) in a serial connection, located inside a metallic container with standard ISO dimension, and comprise: the prefiltering (a sand filter and a cartridge filter) and acid dosing stage; the leachate treatment stage; the permeate stage.
The treatment plants ensure a sustainable, 24h/day operation.
The leachate discharge from the storage cell is performed by pumping it into storage and settling tanks, placed in a serial arrangement and fitted with covering system. From the storage tanks, the leachate is driven towards the treatment plant.
When the two landfills are decommissioned, the site shall be subject to a subsidizing process focused on environmental rehabilitation, intended to determine the restitution of the land to the public domain.