Raspoloživost fosfora u gnojivima nastalim različitim načinima obrade aktivnog mulja

master's thesis

• Title (english): Bioavailability of phosphorus in fertilizers produced by different sewage sludge treatment options
• Author: Jelena Radošević
• Mentor: Jasna Hrenović (mentor)
• Committee member: Jasna Hrenović (član povjerenstva)
• Committee member: Antun Alegro (član povjerenstva)
• Committee member: Zlatko Mihaljević (član povjerenstva)
• Committee member: Martina Šeruga Musić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

U ovom istraživanju proučavao se aktivni mulj u ulozi fosfornog gnojiva. Istraživala su se tri različita načina postupanja s aktivnim muljem prije njegova korištenja u poljoprivredi: direktno nanošenje stabiliziranog aktivnog mulja na poljoprivrednu površinu, njegovo spaljivanje i SUSAN-tehnologija. Rezultat svake spomenute obrade aktivnog mulja jest poseban tip gnojiva. Međusobno se razlikuju po kemijskim spojevima fosfora i njegovoj raspoloživosti poljoprivrednim biljkama te količini organskih otrova i toksičnih teških metala. Spaljivanjem se uklanjaju organski otrovi iz aktivnog mulja, a SUSAN-tehnologijom i velika količina teških metala. Ispitivala se raspoloživost fosfora iz navedenih gnojiva putem analize toka fosfora kroz tri načina postupanja s aktivnim muljem. Željela se ispitati isplativost SUSAN-tehnologije. Pepeo nastao spaljivanjem aktivnog mulja ne sadrži dovoljno raspoloživog fosfora i stoga nije prikladno gnojivo. Raspoloživost fosfora iz SUSAN-gnojiva nije značajno manja od raspoloživosti fosfora iz stabiliziranog aktivnog mulja bez obzira na brojne tehnološke korake potrebne da bi se proizvelo SUSAN-gnojivo pri kojima se moglo izgubiti puno fosfora. Stoga se SUSAN-gnojivo, koje ne sadrži organske otrove niti značajnu količinu toksičnih teških metala, ali sadrži dovoljno raspoloživog fosfora, deklarira isplativim.

Abstract (english)

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.

• Keywords: analiza toka tvari; apsorpcija hraniva; monospaljivanje; termokemijski proces; teški metali
• Keywords (english): heavy metals; monoincineration; nutrient absorption; substance flow analysis; thermochemical process
• Language: croatian
• URN:NBN: urn:nbn:hr:217:129528
• Study programme: Title: Biology; specializations in: Ecology; Course: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra biologije (magistar/magistra biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-04-24 12:31:43