New elements for leakage water treatment in rural areas

Ruta Bendere
2019 Linnaeus Eco-Tech  
According the official data from Waste Management Strategy of Latvia [1] in 1997 there were 558 active dumping sites in the territory of Latvia. It was stated that 257 of them are producing the negative impact on environment and 152 must be immediately closed [2). During the next four years, due to waste management policy of state, great part of them was closed, and in 2001 there were only 380 dumps [3]. In reality those activities diminished the problems of pollution of air and ground water,
more » ... and ground water, but do not avoid them. Most of closed dumps are small (more than 77 % smaller as 2 ha), disposing less then 1,000 m 2 of waste per year. In the same time taking in account that every year the precipitation exceeds the evaporation for -200 mm in Latvia, we can estimate that in average 1 ha of the territory of the dumping site will produce 2000 me 3 of polluted leakage water. As the total area of dumps are more than 780 ha and ground waters are not protected in greatest part of territory (there dominate the soil and gravel as the bottom material), using the date characterising the leakage content, we can estimate that ground waters together with infiltrated leakage water will receive more than 1092 t of nitrogen, 900 t chlorine, 1099 t of ferrous, 780 t of sulphides, and -200 t of different heavy metals per year [2). Provided studies during the last years about the situation in the biggest river Daugava basin [4], shows that there are 333 dumping sites in the territory of river basin; 135 of them are actively working today. The total occupied territory by dumps is more than 500 ha. Most of them are small without any protection installation eliminatin � the ground water pollution. The data shows that there are 70 dumps, where less than 100 m waste per year are disposed, 37 sites where allowed limit of disposal overcomes 1000 m 3 and 13 where more than 10 OOOm 3 waste per year are disposed. On of the most popular solution of this problem is closing and remediation of existing dumps and creating a net of new sanitary landfills. According to Waste Management Strategy of Latvia it will takes the next ten to twenty years and will require more than 80 millions EUR. On the bases of real situation both of those figures are hardly to accept. In practise we need to eliminate the ground water pollution without delay using cheap and effective methods. The Latvian scientists and specialists from University of Agriculture in Jelgava city are dealing with those problems during last ten years. One of the proposed and implemented methods for the reduction of leakage water pollution is usage of wetlands for final treatment of leakage water from waste disposal sites. The date on leakage water cleaning from one of the disposal sites (municipal waste landfill near Bauska), where are arranged wetland consisting of different stages, are presented in the table 1. Ruta Bendere, Latvia
doi:10.15626/eco-tech.2001.026 fatcat:6k3tvr3y65eyho6o7zh2axvdf4