Drisla landfill, was constructed and opened by the City of Skopje in 1994. It is located in the southeastern part of the City at a distance of 14 km from the city center. It covers an area of 76 ha with a project capacity of 26 million m3 of deposited waste. According to the plans in the project documentation, the landfill will be filled in about 30 years. In the past 16 years of exploitation, 33% of the total capacity were filled, which indicates that in the next 30 years there will be a way of depositing, without pre-selection and waste utilization that can serve as a secondary raw material (paper, metal, glass, plastic).
DRISLA – SKOPJE DOO is registered to perform the following activities:
- Treatment and disposal of non-hazardous waste;
- Collection of hazardous waste;
- Treatment and disposal of hazardous waste.
The sanitary landfill Drisla is operational 24 hours a day, 365 days a year, which means that there isn’t any interruption in the technological process. The operation technology itself and the specificity of the activity requires such conditions.
Drisla’s technology is based on the main technological project and plan for the landfill, which includes a sanitary land filling of the communal solid waste.
The technology project involves two phases:
- Construction of the landfill and the necessary infrastructure;
- Selecting and recycling of the waste.
The methods, which are included in the work of Drisla, are:
- disposal of waste,
- its planning,
- compression of the planned waste,
- covering the waste with inert material with a thickness of 30 cm.
The slope of the poured layers has a longitudinal decline of 4%, which allows a leachate of the rain water to the soil drains canals, which significantly reduces the amount of filtrate and excludes the possibility of contamination of water. The created slopes are first covered with inert material, and then with humus, which is 0.7 m thick and then the area is grassed. At the lowest point of the landfill’s bottom , there is a damn, s a o called prism filter, that protects the bottom from surface erosion.
The purification of the waste takes place as a result of their bio-thermal anaerobic decomposition by separating the filtrate (it contains increased amounts of filtrate, chlorides and sulfates), gases (methane, hydrogen, hydrogen sulfide) and a certain amount of heat.
The amount of the filtrate varies from 10 to 15% of total rainfalls, but it is dangerous in a sanitary sense, since its pollution is 5 to 10 times greater than the pollution of the domestic waters.
The processes for separating the gases last from 5 to 10 years, and can take up even longer after the landfill is closed.
The duration of treatment and mineralization of the waste takes up from 15 to 25 years after the landfill’s closing.