Zniževanje vsebnosti kovin iz kompostne izcedne vode z zeoliti

diplomsko delo univerzitetnega študijskega programa

Mirjana Lukić (Author), Marjana Simonič (Mentor), Lidija Fras Zemljič (Co-mentor)

Abstract

Namen diplomske naloge je bil odstraniti težke kovine iz kompostne izcedne vode z zeoliti, aktivnim ogljem in apnom. V diplomskem delu smo poskušali najti primeren in ekonomičen način za čiščenje kompostne izcedne vode, ki nastane kot stranski produkt kompostiranja v podjetju Kogal. Naš cilj je bil, da z obdelavo dosežemo vrednosti Cu2+ pod 0,5 mg/l in Zn2+ pod 2 mg/l v kompostni izcedni vodi in jo lahko tako spuščamo direktno v naravne vodotoke. Pri analiziranju smo merili fizikalno-kemijske parametre: pH, vsebnost Cu2+ in Zn2+, celotni organski ogljik (TOC) in celotni dušik (TN). Analize so pokazale, da je ključnega pomena, da kompostno izcedno vodo predhodno filtiriramo, saj večji delci zamašijo pore in površino zeolita ter posledično znižajo učinkovitost odstranjevanja kovin. Najboljše rezultate smo dobili, ko smo kompostno izcedno vodo obdelali z mešanico zeolita (80 g/l), aktivnega oglja (50 g/l) in apna (pH=10). Z omenjeno obdelavo se je vsebnost Cu2+ znižala za 80,4 % iz 2,71 mg/l na 0,53 mg/l. Kompostna izcedna voda je že v osnovi vsebovala majhne koncentracije Cu2+ (0,21 mg/l). Cu2+ smo najbolj uspešno odstranili z mešanico zeolita (80 g/l) in apna (pH=10). Pri tem se je vsebnost Cu2+ znižala iz 0,23 mg/l na 0,08 mg/l, kar pomeni da smo uspeli za 65 % znižati vsebnost Cu2+ v kompostni izcedni vodi. Analize so pokazale, da s centrifugiranjem in usedanjem dosežemo podoben učinek čiščenja. Dokazali smo, da pH in koncentracija adsorbenta vplivata na učinkovitost odstranjevanja Cu2+ in Zn2+ iz kompostne izcedne vode. Ko smo pH umerili na 9 in dodali 40 g/l zeolita se je vsebnost Zn2+ znižala za 77 % in Cu2+ za 22 %, medtem ko se je pri pH=10 in 80 g/l zeolita vsebnost Zn2+ znižala za približno 81 % in Cu2+ za 65 %. Rezultati so pokazali, da zeoliti ne znižajo vsebnosti celotnega organskega ogljika v kompostni izcedni vodi (sobna T) in da za 20 % znižajo vsebnost celotnega dušika.

Keywords

kompostna voda;zeoliti;odstranjevanje kovin;kovine;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2016
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[M. Lukić]
UDC:	628.161.2(043.2)
COBISS:	19628054
Views:	1600
Downloads:	125
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	METAL REMOVAL FROM COMPOST LEACHATE USING ZEOLITE
Secondary abstract:	The purpose of this study was to remove heavy metals from compost leachate using zeolite, activated carbon and lime. In this thesis, we tried to find a suitable and economical way to clean the compost leachate so that it may be discharged into natural waterways. Our goal was to achieve less than 0,5 mg/l of Cu2+ and less than 2 mg/l of Zn2+ in the compost leachate. We measured the physico-chemical parameters: pH, content of Zn2+ and Cu2+, total organic carbon and total nitrogen. Analyses have shown that it is crucial to filter compost leachate, since larger particles can clog the pores and surface of zeolite and reduce metal removal efficieny. The best results were obtained when Zn2+ was removed from the compost leachate with mixture of zeolite (80 g/l), activated carbon (50 g/l) and lime (pH=10). In doing so, Zn2+ content in the compost leachate decreased by 80,4 % from 2,71 mg/l to 0,53 mg/l. Compost leachate has contained small concentrations of Cu2+ (0,21 mg/l). Cu2+ was most effectively removed from compost leachate using mixture of zeolite (80 g/l) and lime (pH=10). In doing so, the Cu2+ content decreased from 0,23 mg/l to 0,08 mg/l, which represents a 65% reduction. Analyses have shown that centrifugation and sedimentation have similar effects on Cu2+ and Zn2+ removal efficiency. We have found out that pH and concentration of adsorbent have a significant impact on the removal efficiency of Cu2+ and Zn2+ from compost leachate. At pH=9 and 40 g/l of zeolite, Zn2+ content decreased by 77 % and Cu2+ by 22 %, while at pH=10 and 80 g/l of zeolite, Zn2+ was reduced by 81 % and Cu2+ content by 65%. The results showed that zeolite does not have an impact on the reduction of total organic carbon in compost leachate (room T) and that they reduce total nitrogen content by 20 %.
Secondary keywords:	compost leachate;zeolite;metal;removal;
URN:	URN:SI:UM:
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	X, 59 str.
ID:	9141159