Bioavailability of phosphorus in fertilizers produced by different sewage sludge treatment options

Radošević, Jelena (2013) Bioavailability of phosphorus in fertilizers produced by different sewage sludge treatment options. Diploma thesis, Faculty of Science > Department of Biology.

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In this research sewage sludge as a phosphorus fertilizer was studied. Three different ways of processing sewage sludge prior to its use in agriculture were investigated: direct application of stabilized sewage sludge on arable fields, sewage sludge incineration and SUSAN technology. The result of each aforementioned treatment of sewage sludge is a unique type of fertilizer. They differ from each other in the chemical compounds of phosphorus present and therefore its bioavailability, as well as the amount of organic toxins and toxic heavy metals. Incineration eliminates organic toxins from sewage sludge and SUSAN technology eliminates most of heavy metals from it as well. Bioavailability of phosphorus in each of the fertilizers was investigated through phosphorus flow analysis in three ways of sewage sludge treatment. The feasibility of SUSAN technology was examined. Ash produced by incineration of sewage sludge does not contain sufficient amount of bioavailable phosphorus and therefore is not an appropriate fertilizer. The bioavailability of phosphorus from SUSAN fertilizer was proved not to be significantly lower than the bioavailability of phosphorus from stabilized sewage sludge regardless of the number of technological steps necessary to produce SUSAN fertilizer in which a lot of phosphorus could be lost. Therefore, the SUSAN fertilizer, which does not contain organic pollutants or significant amount of toxic heavy metals, but does contain sufficient amount of bioavailable phosphorus, was declared feasible.

Item Type: Thesis (Diploma thesis)
Keywords: heavy metals, monoincineration, nutrient absorption, substance flow analysis, thermochemical process
Supervisor: Hrenović, Jasna
Date: 2013
Number of Pages: 48
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 26 Sep 2014 11:52
Last Modified: 26 Sep 2014 11:52

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