Akademik Veri Yönetim Sistemi
FRESENIUS ENVIRONMENTAL BULLETIN, cilt.27, sa.6, ss.4532-4542, 2018 (SCI-Expanded, Scopus)
The application of sewage sludge which is a biological waste and produced in wastewater facilities on the soil is one of the alternative disposal methods. The aim of this study was to use sewage sludge in establishing grass area in the soils which have different lime levels and detection of heavy metal accumulation was aimed. A pot experiment with Lolium perenne L. grass plants was conducted with the purpose of mixing the dried and stabilized sewage sludge homogenously into two soils consisting of CaCO3 at 0 (SS0), 0.5 (SS0.5), 1 (SS1), 2 (SS2), 4 (SS4), 8 (SS8) tone da(-1) doses; %8 (S1) and %19.4 (S2) levels.The results of the experiment showed that sewage sludge applications led to an increase in pH, EC, organic matter in both soils. Moreover, total N, P, K, Ca, Mg, Fe, Zn and Mn concentrations of the soils increased whereas Cu concentration decreased. As a general evaluation was made in terms of lime levels of the soils, it was stated that total Fe, Zn, Mn and Cu concentrations of the soilswere higher in Si soil than S2 soil. Total Ni concentration of the growing media (sewage sludge mixed calcareous soils) increased with the sewage sludge applications while total Cr and Cd concentrations showed a little decrease. On the other hand, Pb concentration was detected as below the detection limits. Total Ni, Cr and Cd concentrations of the growing media were detected as higher in S1 soil than S2 soil. Based on increasing sewage sludge applications, a specific increase in dry matter weight of the plants was determined. Moreover, as plant N, P, K, Ca, Mg, Zn and Cu concentrations increased Fe, Mn, Cr and Cd concentrations decreased. Ni concentrations of the plants decreased until SS1 application; however there was the tendency for the values to increase following this application. With the sewage sludge applications, heavy metal toxicity limit levels were not surpassed in both experiment soils and grown grass plants. It was seen that the applications affected growth and development of grass plants positively. When the analyzed criteria were evaluated, maximum plant dry weight was obtained in 8 tone da(-1) (SS8) application and no heavy metal toxicity was found, However, 4 tone dal applications were thought to be safe for the plant development and environmental health considering possible risks caused by repetition of sewage sludge applications in time.