Study Of Phytotoxic Properties Of Sewage Sludge
Stabilised By Alkaline Mediums
Author(s)
P. Samaras, C. A. Papadimitriou, E. Papastergiadis, A. Pappa
& K. Gudulas
Abstract
The aim of this work was the examination of the stabilization potential of sewage
sludge by fly ash and lime and the investigation of the phytotoxic properties of
the produced mixtures. About 0,5 m3 sewage sludge were mixed with the
alkaline substances in various ratios and the products were stabilized for 3
months. Samples from each mixture were analyzed for the determination of their
physicochemical content such as pH, moisture, and nutrients. Stabilization of
sewage sludge was achieved depending upon the concentration and the type of
alkaline medium, due to the pH increase of the mixture; however, the alkaline
addition resulted in the reduction of the nutrients content. Phytotoxicity effects
were determined by the measurement of the corresponding inhibition effects of
the produced mixtures on the seed germination and root length growth of three
higher plants (one monocotyl and two dicotyls). Samples obtained from the early
stages of stabilization process exhibited high inhibition on seed germination and
root length growth; however, these effects were reduced for samples prepared at
extended stabilization times.
Keywords: fly ash, lime, sewage sludge, stabilization, phytotoxicity.
1 Introduction
The improvement of sewage sludge management is an important issue during the
preparation of an integrated wastewater management plan. Sewage sludge has
been already utilized in agricultural and horticultural applications for several
years as it represents an alternative source of nutrients for plant growth, and an
Keywords
fly ash, lime, sewage sludge, stabilization, phytotoxicity.
Related Book
Other papers in this volume
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