Hrvatske vode
 
Elektrokemijska/ultrazvučna/elektromagnetska obrada zrelog odlagališta eluata
Electrochemical/ultrasound/electromagnetic treatment of mature landfill eluate

Višnja Oreščanin1, Robert Kollar2, Karlo Nađ2, Damir Ruk3, Ivan Halkijević4, Marin Kuspilić4

Sažetak/Abstract: 

Svrha ovog rada je razvoj sustava za pročišćavanje procjednih voda starih odlagališta komunalnog otpada simultanom primjenom elektrokemijskih, ultrazvučnih i elektromagnetskih metoda u laboratorijskim uvjetima i pilot postrojenju. Procjedna voda je uzeta s dva sanitarna odlagališta (Piškornica i Tarno) i podvrgnuta elektrokemijskoj obradi primjenom elektroda od nehrđajućeg čelika, željeza i aluminija uz istovremenu obradu ultrazvukom i recirkulaciju kroz elektromagnetsko polje. Reakcije zagađivala iz procjednih voda s elektrokemijski generiranim hipokloritom, kromatima i slobodnim radikalima, kao i termička razgradnja u kavitacijskim mjehurićima su odgovorni za brzo i efi kasno uklanjanje organske tvari i amonija s učinkovitosti uklanjanja KPK, BPK5 i amonijaka preko 99 % nakon 85 minuta obrade. Uklanjanje teških metala do 99,93 % uglavnom je postignuto elektrokoagulacijom pomoću elektroda od željeza i aluminija. Svi mjereni pokazatelji u obrađenoj vodi kako u laboratorijskim uvjetima tako i na pilot postrojenju su bili znatno niži u odnosu na njihove maksimalno dopuštene koncentracije za vode koje se mogu ispustiti u prirodni prijemnik.

 

The purpose of this paper is to develop a treatment system for leachate from old municipal landfills by means of electrochemical, ultrasound and electromagnetic methods in laboratory conditions and at a pilot plant. The leachate was taken from two sanitary landfills (Piškornica and Tarno) and subjected to electrochemical treatment by implementing electrodes made of stainless steel, iron and aluminium, and a simultaneous treatment with ultrasound and recirculation through electromagnetic fi eld. The reactions of pollutants from the leachate with the electrochemically generated hypochlorite, chromates and free radicals as well as thermal decomposition in cavitation bubbles are responsible for fast, efficient removal of organic matter and ammonium. The removal efficiency of COD, BOD5 and ammonium is over 99 % after 85-minute treatment. The removal of heavy metals up to 99.93 % is mostly achieved by means of electrocoagulation with iron and aluminium electrodes. All measured indicators in treated water, both in laboratory conditions and at the pilot plant, were significantly lower with respect to their maximum permitted concentrations in waters that can be discharged into a natural receiving body.

Kategorija: 
Izvorni (originalni) znanstveni članak / Original Scientific Paper
Ključne riječi/Key words: 

procjedna voda, elektrokoagulacija, elektromagnetska obrada, elektrooksidacija, elektroredukcija, procjedna voda, ultrazvuk

leachate, electrocoagulation, electromagnetic treatment, electrooxidation, electroreduction, ultrasound

Podaci o autorima/Authors affiliations: 

1OREŠČANIN, j.d.o.o., A. Jakšića 30, 10000 Zagreb, vorescan@gmail.com

 

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

 

3Komunalac, Mosna 15, 48000 Koprivnica

 

4Građevinski fakultet Sveučilišta u Zagrebu, Kačićeva 26, 10000 Zagreb

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