Odstranjevanje kovin iz kompostne odpadne vode

diplomsko delo univerzitetnega študijskega programa I. stopnje

Maša Seitl (Author), Marjana Simonič (Mentor), Lidija Fras Zemljič (Co-mentor), Karli Udovičič (Co-mentor)

Abstract

Namen diplomskega dela je bil z elektrokoagulacijo odstraniti ione težkih kovin iz kompostne odpadne vode, ki nastaja pri predelavi biorazgradljivih odpadkov na kompostarni mentorskega podjetja Kogal. Razen vsebnosti kovinskih ionov smo v vodi preverjali tudi prisotnost organskih snovi z določevanjem kemijske potrebe po kisiku (KPK). S preučevanjem fizikalno-kemijskih parametrov smo s preliminarnimi poskusi želeli izbrati optimalne pogoje za obdelavo kompostne vode. Najboljše rezultate smo dosegli s 180 min elektrokoagulacijo pri U = 15 V, r = 3 cm in začetnem pH 6,1, kjer smo s 100 % učinkovitostjo odstranili Cu2+ in Cr6+, Fe2+ 99,4 %, Mn2+ 97,8 %, Zn2+ 90 % in Ni2+ 44 %. Vrednost KPK se je znižala za 36 %. Po opravljenih preliminarnih poskusih smo z analizo vseh meritev določili najučinkovitejše pogoje za elektrokoagulacijo: t = 90 min, U = 15 V, r = 3 cm, začetni pH 6, voda predhodno centrifugirana 5 min pri 8000 obr/min. Zaradi drugačne sestave vode, ki smo jo uporabili za ta eksperiment, nismo dosegli tako dobre učinkovitosti odstranjevanja kovinskih ionov: Cr6+ 87,4 %, Cu2+ 76,8 %, Zn2+ 66,3 %, Fe2+ 61,2 %, Mn2+ 53,9 % in Ni2+ 0,7 %, smo pa uspešno znižali vrednost KPK, in sicer za 75 %. Poskus pri pogojih, ki smo jih določili za najučinkovitejše, je pokazal, da na podlagi predhodnih rezultatov meritev ne moremo določiti pogojev za obdelavo kompostne vode, saj so zelo odvisni od sestave kompostne vode, ki jo želimo čistiti. Ugotovili smo, da z elektrokoagulacijo kompostno vodo lahko očistimo kovinskih ionov, vsebnost organskih snovi pa se zniža le malo. Lahko bi jo uporabili kot metodo za pred-čiščenje ali pa bi z njo čistili predhodno obdelano vodo.

Keywords

kompostna voda;čiščenje vode;elektrokoagulacija;kovinski ioni;KPK;

Data

Language:	Slovenian
Year of publishing:	2015
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[M. Seitl]
UDC:	628.349:66.087.5(043.2)
COBISS:	19431958
Views:	1885
Downloads:	170
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Metal removal from compost leachate
Secondary abstract:	The purpose of the diploma was to investigate the removal of heavy metal ions from compost leachate, generated by processing of biodegradable waste in the composting plant of the tutoring company Kogal, with electrocoagulation. In addition to heavy metal ions, we also examined the presence of organic substances with the level of chemical oxygen demand (COD). We sought to create the optimal conditions for the electrocoagulation of compost leachate with an examination of the physical-chemical parameters and preliminary experiments. The best results were attained with an 180 min electrocoagulation at U = 15 V, r = 3 cm and initial pH 6,1, where the removal efficiency of Cu2+ and Cr6+ were 100 %, Fe2+ 99,4 %, Mn2+ 97,8 %, Zn2+ 90 % and Ni2+ 44 %. The COD level was further reduced by 36 %. After finishing the preliminary tests, we analyzed the measurements and determined the most efficient conditions for electrocoagulation: t = 90 min, U = 15 V, r = 3 cm, initial pH 6, preliminary water centrifugation for 5 min at 8000 rpm. Because of the different compounds in the compost leachate used in this experiment, the efficiency of metal ion removal efficiency was not as effective: Cr6+ 87,4 %, Cu2+ 76,8 %, Zn2+ 66,3 %, Fe2+ 61,2 %, Mn2+ 53,9 % and Ni2+ 0,7 %; however, we managed to successfully reduce the COD level by 75 %. The experiment in conditions we believe to be most efficient demonstrate that we cannot base the conditions for compost leachate treatment on the results of previous measurements, as they vary due to the composition of compost leachate that we wish to purify. We have established that we can remove metal ions from compost leachate with electrocoagulation, but the COD level is reduced to a lesser extent. However, it could be used as a method for pre-purification as a preliminary water purification treatment.
Secondary keywords:	compost leachate;purification;electrocoagulation;metal ions;COD;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	VIII, 44 str.
ID:	8887935