Industrial By-Products for the Rehabilitation of Coal Mining-Affected
Areas -- a Novel Approach
Abstract
The blends of coal combustion by-products (CCBs) with organic wastes
(sewage sludge and spent mushroom compost) were investigated for
elaboration of soil substitutes for land rehabilitation of coal mine
affected areas. The study incudes four types four types of habitat with
different water retention and fertility i.e.: dry and moderate fertility
(A1-A3), mesic and low fertility (B1-B3), mesic and moderate fertility
(C1-C3), humid and low fertility (D1-D3). Obtained results revealed that
the amounts of macronutrients were sufficient for supporting plant
growth i.e.: N (0.44-0.60 %), P (0.13-021 %), K (1.63-1.98 %), Mg
(1.01-1.38 %), Ca (5.32-8.23 %), S (2.66-4.12 %), whereas the
concentration of organic matter varied within the range 20.3-27.9 %.
Phytotest using white mustard (Sinapis alba) seeds under laboratory
conditions showed that the best results of sprouting i.e: 56 and 66 %
were obtained for D2 and D3, respectively. The values of pH (8.16-8.78)
and electrical conductivity (5.28-6.73 mS·cm-1) of tested soil
substitutes were found to be the decisive factors limiting the
germination process. The coefficients between the parameters of soil
substitutes and the Sinapis alba sproutings have revealed negative
correlation with electrical conductivity (r = -0.46). Additionally,
tests with meadow vegetation gave promising opportunity for the use of
soil substitutes in the process of land rehabilitation. The cover of the
mesic and dry meadow vegetation reached 90%. The Principal Component
Analysis (PCA) has outlined that pH, content of P and organic matter,
are the most important factors that influence cover of meadow
vegetation.