Hrvatske vode
 
Elektrokemijska obrada otpadnih voda iz procesa proizvodnje čipsa
Electrochemical treatment of wastewater from potato chips production

Višnja Oreščanin1, Robert Kollar2, Karlo Nađ2

Sažetak/Abstract: 

U radu je prikazan novi kombinirani pristup u obradi otpadne vode koja nastaje u procesu prerade krumpira u čips kombinacijom elektrokemijskih metoda i ozoniranja. Otpadna voda je karakterizirana visokim vrijednostima ukupne suspendirane tvari (1517 mg dm-3), kemijske potrošnje kisika (2240 mg dm-3) te biokemijske potrošnje kisika (1780 mg dm-3) koje premašuju granične vrijednosti za ispust u okoliš za 43, 18 odnosno 71 puta. U svrhu optimizacije procesa u radu je ispitan utjecaj vrste elektroda (nehrđajući čelik, željezo, aluminij), kontaktnog vremena (5-30 minuta) te jakosti struje (30-100 A) na stupanj uklanjanja navedena tri parametra. Iako se aluminijev set elektroda pokazao najefikasnijim za uklanjanje navedenih pokazatelja, značajno bolji rezultati su dobiveni kombinacijom sve tri vrste elektroda uz istovremeno ozoniranje. Nakon 10 minuta elektrokoagulacije/elektroksidacije pomoću elektroda od nehrđajućeg čelika, 5 minuta elektrokoagulacije/ozoniranja pomoću željezovih elektroda, 15 elektrokoagulacije/ozoniranja pomoću aluminijevih elektroda te 15 minuta ozoniranja uklonjeno je 100% boje, mutnoće i UST, 94,5% KPK te 98,9% BPK5 a svi mjereni pokazatelji su zadovoljavali uvjete za ispust u okoliš.

 

The paper presents a new approach which combines electrochemical methods and ozonation to wastewater treatment from potato processing in potato chips production. This wastewater is characterized by high values of total suspended solids (1517 mg dm-3), chemical oxygen demand (2240 mg dm-3) and biochemical oxygen demand (1780 mg dm-3) that exceed the limit values for discharges into the environment by 43.18 and 71 times, respectively. For the purpose of optimisation of this process, the paper investigated the impact of different electrode types (stainless steel, iron, aluminium), contact time (5-30 minutes) and amperage (30-100 A) on the degree of removal of these three parameters. Although the aluminium electrode set proved the most effective for the removal of these indicators, significantly better results were obtained by a combination of all three electrode types with simultaneous ozonation. After 10 minutes of electrocoagulation / electrooxidation with stainless steel electrodes, 5 minutes of electrocoagulation / ozonation with iron electrodes, 15 minutes of electrocoagulation / ozonation with aluminium electrodes and 15 minutes of ozonation, 100% colour, turbidity and TSS, 94.5% COD and 98. 9% BOD5 were removed, and all measured indicators met the requirements for discharges into the environment.

Kategorija: 
Prethodno priopćenje / Preliminary Report
Ključne riječi/Key words: 

aluminijeve elektrode, elektrode od nehrđajućeg čelika, elektrokoagulacija, otpadne vode, ozoniranje, proizvodnja čipsa, željezove elektrode

aluminium electrodes, stainless steeel electrodes, electrocoagulation, wastewater, ozonation, potato

chips production, iron electrodes

Podaci o autorima/Authors affiliations: 

1Oreščanin, j.d.o.o., A. Jakšića 30, 10000 Zagreb, Hrvatska, vorescanin@gmail.com

 

2Napredna energija d.o.o., V. Prekrata 43, 10000 Zagreb

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