The average concentrations of heavy metals tested in the MP and PP leachates were generally lower than those found in typical municipal wastewater (Henze et al., 2008). Although both prisms had similar pH values (Figs. 2 and 3), the long-term metal-binding potential of the MP is questionable because broad parameters, such as those tested in this study (COD, BOD, pH, etc.), cannot predict this potential.A further question remains regarding whether the reconcentration
of wastewater from the SU and CU may serve as an additional source of heavy metals, as mentioned above, and/or influence the mobility of heavy metal deposits within the solid waste structure. According to the obtained results, both the SU and CU are important sources of heavy metals(Fig. 6),