%0 Journal Article
%T Influence of Stabilized Biosolids Application on Availability of Phosphorus, Copper, and Zinc
%A S. M. Shaheen
%A M. S. Shams
%A F. A. Elbehiry
%A S. M. Ibrahim
%J Applied and Environmental Soil Science
%D 2012
%I Hindawi Publishing Corporation
%R 10.1155/2012/817158
%X The main aim of this study was to examine the influence of sewage sludge (SS) and stabilized SS application on Olsen-P and DTPA-extractable Cu and Zn in relation to soil type, sewage source, mixing rate and incubation time. Two different SS were mixed with amendments by mixing rates 10 and 25%. These amendments include coal fly ash (CFA), bentonite (B), sugar beet factory lime (SBFL), calcium carbonate, rice straw (RS), water hyacinth (WH), and cotton stalks (CS). Treated and untreated SS had been applied to fluvial and calcareous soil with application rate 2.5% and incubated for one and two month. After incubation, soil samples were analyzed for Olsen-P and DTPA-extractable Cu and Zn. Application of SS increased significantly Olsen-P and DTPA extractable Cu and Zn compared to control. Application of stabilized SS increased significantly Olsen-P, with high increasing rate with SBFL and WH-stabilized SS. Stabilized-SS decreased significantly Cu and Zn availability compared to mono SS treatment. Bentonite-, SBFL and CFA-stabilized SS were the highest among inorganic treatments for reducing available Cu and Zn either in fluvial or calcareous soil, while WH and RS-stabilized SS treatment were the most suitable organic ones for reducing DTPA-extractable Cu and Zn. 1. Introduction Waste management is recognized as an important issue in modern societies, and waste recycling is encouraged as an alternative to stockpiling and incineration. The application of sewage sludge or composts of several origins as amendments to agricultural soils is an economically attractive waste management strategy promoted by scientists and regulating organisms and is a common practice since many years [1, 2]. Improvement of soil properties is among the benefits of sewage-sludge application to agricultural land. In association with its high organic matter content, sludge contains also appreciable amounts of macro- and micronutrients with significant fertilizer replacement value [1]. These beneficial effects make sludge application an attractive option for eroded soils of dry Mediterranean climates that usually have low organic matter content. However, land application of SS has been limited by its enriched pathogens and heavy metal contents. Excessive levels of trace elements introduced to soil by SS can lead to elevated uptake of trace elements by plants, which will cause damage to plants and effects on human health upon consumption of crops grown on the soil [3]. So, the study of effective methods for trace element removal from sludge is very important in order to minimize
%U http://www.hindawi.com/journals/aess/2012/817158/