Environmental projects


  • Drainage water treatment in purification marsh
  • Automatic surveillance of the operation of purification marsh
  • Automatic surveillance of the operation of settling tank with adjusted discharge
  • Arrangement of exhausted peat harvesting areas
  • We promote the use of local biofuels in small boiler rooms

Until the present, settling tanks have mostly been used for the treatment of drainage water. Settling tanks allow for the treatment of mining water only in view of the peat in suspension and this only just partially. Surveys carried out in Finland indicate that purification marshes operate significantly more effectively in comparison with settling tanks. The content of suspension and total nitrogen can be decreased in the mining water which has passed through the purification marsh up to 70%, the content of ammoniacal nitrogen 60-90%, nitrate 20-60% and phosphorous 40-65% (Huttunen et al. 1996).
At the same time, the efficiency of marsh depends on a lot of circumstances such as the intensity of flow, character of vegetation, water mode, properties of peat etc. As it is not standard technology, the creation of a specific marsh area requires additional surveys and more careful surveillance of the treatment process (thorough surveillance). However, we can account for the marsh to retain the major part of suspension and also part of the dissolved contaminants. Therefore, the marshes ensure more effective treatment of water in comparison with settling tanks (Pajula 2004).