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Waste Management & Research
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Revegetating Industrial Waste Disposal Sites

Matti O. Ettala

Paavo Ristola Ltd., Consulting Engineers, Terveystie 2, 15870 Hollola, Finland

Short-rotation tree plantations were established at seven industrial waste disposal sites in southern Finland. Altogether 31,500 willow cuttings were planted between 1984 and 1989. Neutralized residue from a titanium dioxide pigment process had an unfavourable influence on growth. Biological sludges from a municipal sewage treatment plant, and pulp and paper mills were too compact to be used alone as substrate, but gave a good supply of nutrients. Sand, bark and de-inking waste were sufficiently porous, but were low in nutrients. A mixture of different waste materials is therefore recommended as a substrate for willow stands. Replacement of a natural soil cover with waste material allows disposal of a greater volume of refuse and diminishes the costs of revegetation. The landfill characteristics have to be taken into account. The high temperature of bark also disturbed the growth of willow stands. Ferrous sulphate in the landfill limits the possibility of irrigating the stand. The highest biomass production of the stands exceeded that of normal Finnish forest. Willow stands can be used for landscaping industrial waste disposal sites, for increasing evapotranspiration and minimizing leachate discharge.

Key Words: Landfill • pulp • titanium dioxide • vegetation • landscaping • Salix • willow • Finland

Waste Management & Research, Vol. 9, No. 1, 47-53 (1991)
DOI: 10.1177/0734242X9100900105
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