Correlations between field capacity, porosity, solid particle density and dry density of a mechanically and biologically (biodried) treated reject waste stream

Several parameters are crucial for the proper functioning of bioreactor landfills (BL): field capacity (θ_k), porosity (n), solid particle density (ρ_s) and dry density (ρ_d). This paper considers the correlations between parameters, as measured on mechanically and biologically treated waste stream suitable for a BL. In total, 53 waste samples were tested and the n, ρ_s and ρ_d values were recorded. The related θ_k values were calculated from the modified ρ_d vs. θ_k relationship, published by Fungaroli and Steiner (1979). Through modified expressions, the following relationships were derived: second degree polynomial n vs. θ_k and first degree polynomial ρ_s vs. θ_k. In addition, the first degree polynomial ρ_d vs. n is proposed. The outlined relationships clearly highlight the contribution of n and ρ_s on corresponding θ_k values. Therefore, for optimal operating conditions of the BL, continuous monitoring of the mentioned parameters and proper adjustment of the θ_k value is necessary.