Phytoremediation using Poa pratensis balin lawn and sludge in Mashad industrial town treatment plant

Abstract

We studied four levels of Mashad Industrial town treatment sewage sludge (0,10,15,20) on phytoremediation capacity of metals such as Nickle, Lead on physiological and developmental features of Poa pratensis balin lawn in a full random design with four iterations .Results showed meaningful accumulation of Nickle in roots and aerial organs in Poa lawn. The highest amount of Nickle accumulation is in Poa lawn root with treatment of 15% and 20% (0.23 and .022 mlgr/kg) .The lowest amount of accumulation obtained in control treatment (0.15 mlgr/kg). Lead accumulation in Poa lawn aerial parts is meaningful at 5% probability which is not observed in roots yet. The value of Poa lawn dried and wet weight in aerial parts and roots has meaningfully changed as a result of sludge usage. Measures of general values of chlorophylls and carotenoid have not changed drastically. Sludge usage lead to decrease in relative ratio of wet content and stomatal conductance. The lowest amount of ion leakage is in controlled sample (13.43%) and treatment with 10% sludge weight (24.5%) and 15% (24.83%) sludge weight didn’t show any meaningful difference. The highest rate of ion leakage obtained in treatment with 20% Poa sludge (28.7%) which proved meaningful change in comparison with other treatment samples. Results demonstrated that lawn can develop in floors containing sludge in Mashad Industrial town treatment plant. It can be introduced as a Nickle purifying of soil but it is not much capable of soil lead absorption.