Zniževanje KPK v odpadni vodi s Fentonovim reagentom

magistrsko delo

Bernarda Kuster (Author), Marjana Simonič (Mentor), Zorka Novak-Pintarič (Co-mentor)

Abstract

Cilj magistrske naloge je bil ugotoviti, ali je z uporabo Fentonovega reagenta mogoče znižati onesnaženost odpadne vode z organskimi spojinami, izraženo s kemijsko potrebo po kisiku (KPK). Fentonov reagent pomeni reakcijo med železovimi ioni Fe2+ in vodikovim peroksidom, pri čemer nastanejo visoko reaktivni hidroksilni radikali, ki razgrajujejo organske spojine. Pripravili smo sintetične vzorce odpadne vode s huminsko kislino in tioureo. V nadaljevanju smo čistili tudi realno kompostno izcedno vodo. Eksperimente smo izvajali pri različnih pogojih Fentonove reakcije, tako da smo spreminjali maso FeSO4 × 7H2O, ki smo ga uporabili kot vir Fe2+, razmerje med reagenti, čas trajanja reakcije in pH-vrednost. Učinek čiščenja smo v glavnem spremljali z merjenjem KPK, absorbance in motnosti. Ugotovili smo, da je bila Fentonova reakcija primerna za čiščenje sintetičnih vzorcev odpadne vode s huminsko kislino in kompostne izcedne vode, medtem ko za sintetične vzorce odpadne vode s tioureo znižanja KPK nismo dosegli. Najbolj učinkovito znižanje KPK je pri obdelavi sintetične odpadne vode s huminsko kislino znašalo 97,40 %, dosegli pa smo ga pri pogojih reakcije: "mFeSO4 × 7H2O " = 0,2 g, "nFeSO4 × 7H2O∶ nH2O2 " = 1 : 3, pH = 3, t = 60 min. Najučinkovitejše znižanje KPK pri obdelavi kompostne izcedne vode je doseglo 64,08 % pri pogojih reakcije: "mFeSO4 × 7H2O " = 0,6 g, "nFeSO4 × 7H2O∶ nH2O2 " = 1 : 5, pH = 4,5, t = 30 min.

Keywords

odpadne vode;huminska kislina;tiourea;kompostna voda;kemijska potreba po kisiku;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	2.09 - Master's Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[B. Kuster]
UDC:	628.179.2(043.2)
COBISS:	21028886
Views:	1173
Downloads:	178
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Decreasing of COD in wastewater with Fenton's reagent
Secondary abstract:	The aim of the master thesis was to determine whether the use of Fenton's reagent can reduce pollution of wastewater with organic compounds, expressed as the chemical oxygen demand (COD). Fenton's reagent means the reaction between iron ions Fe2+ and hydrogen peroxide, whereby highly reactive hydroxyl radicals, which decompose organic compounds are formed. We prepared synthetic wastewater samples containing humic acid and thiourea. Hereinafter, we also cleaned a real compost leachate. Experiments were carried out under different conditions of Fenton's reaction by varying the ratio of the reagents, the reaction time, the pH value and the mass of FeSO4 × 7H2O, which was used as a source of Fe2+. The cleaning efficiency was mainly monitored by measuring COD, absorbance and turbidity. We have found that Fenton's reaction was suitable for treatment of synthetic wastewater containing humic acid and for treatment of compost leachate, while in the case of synthetic wastewater containing thiourea COD reduction was not achieved. The maximum reduction of COD for the treatment of wastewater containing humic acid stood at 97.40%, achieved at following conditions: "mFeSO4 × 7H2O " = 0,2 g, "nFeSO4 × 7H2O∶ nH2O2 " = 1 : 3, pH = 3, t = 60 min. The maximum reduction of COD for the treatment of compost leachate has reached 64.08 % at the reaction conditions: "mFeSO4 × 7H2O " = 0,6 g, "nFeSO4 × 7H2O∶ nH2O2 " = 1 : 5, pH = 4,5, t = 30 min.
Secondary keywords:	wastewater;humic acid;thiourea;compost leachate;chemical oxygen demand;Fenton's reagent;
URN:	URN:SI:UM:
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	XI, 52 str.
ID:	10860334