Wpływ procesu elektrochemicznego na stężenie azotu ogólnego i ortofosforanów w odpływie z reaktora z unieruchomioną błoną biologiczną

Kłodowska, I.; Rodziewicz, J.; Janczukowicz, W.; Filipkowska, U.

Artykuł - szczegóły

Tytuł artykułu

Wpływ procesu elektrochemicznego na stężenie azotu ogólnego i ortofosforanów w odpływie z reaktora z unieruchomioną błoną biologiczną

Autorzy

Kłodowska I. , Rodziewicz J. , Janczukowicz W. , Filipkowska U.

Treść / Zawartość

Pełne teksty:

Pobierz

Identyfikatory

Warianty tytułu

Effect of Electrochemical Process on the Concentration of Total Nitrogen and Orthophosphates in the Outflow from the Reactor with Immobilized Biofilm

Języki publikacji

Abstrakty

Municipal and industrial wastewaters discharged to water reservoirs should be characterized by a low load of nutrients. Nitrogen and phosphorus are responsible for eutrophication, is therefore necessary to find the effective solutions for their removal. The experiment has been carried in order to determine the impact of the electric current density on the course of simultaneous electrocoagulation and hydrogenotrophic denitrification in the rotating electro-biological contactor (REBC).The study was conducted in the laboratory scale, parallely in three anaerobic reactors, in conditions of the flow electric current. In the REBC unit, rotating disks made of stainless steel with immobilized biofilm were the cathode. Hydrogen donor produced on the surface of cathode, in water electrolysis process, was used by denitrifying bacteria for nitrates reduction. As the anode an aluminum electrode mounted in the reactors was used. As a result of the anode electrolytic dissolution releasing Al³⁺ ions combined with the hydroxyl ions emitted on the cathode, formed metal hydroxides, which functioned as a coagulant in the binding of phosphate ions. In crude wastewaters inflowing to the bioreactors the concentration of orthophosphates was 8.1 mgPO4×dm^-3 and total nitrogen 81.36 mg N_og×dm^-3 and the concentration of organic compounds was equal 40.52 mg O₂×dm^-3 . The study showed that regardless the operating parameter of the electrolysis process, effluent concentration of orthophosphate below 1 mg PO4×dm^-3 was obtained. However, the lowest concentration were observed at a density 0.05 mA×cm^-2 . The efficiency of 97.27% corresponded to the phosphate concentration equal 0.22 mg PO₄×dm^-3. The increase of electric current density resulted in a higher concentration of orthophosphate in the effluent from the reactors, because of more intensive dissolution of aluminum hydroxide with the increase of wastewater alkalinity and a limited amount of secreted Al³⁺ ions, as a result of aluminum oxide accumulation on the anode surface. In the same time, electrolytically-aided denitrification process affected the reducing concentration of total nitrogen in the wastewaters with the increase of electric current density, as a result of intensive use a hydrogen donor by denitrifying bacteria. The lowest concentration of total nitrogen in the treated wastewaters was achieved at the highest current density 0.1 mA cm^-2 – 16.15 mgN_og dm^-3 , which corresponded to 80.15% effectiveness. The research has shown that bio-electrochemical reactor may be an alternative solution for reactors with suspended biomass designed for nutrients removal.

Słowa kluczowe

proces elektrochemiczny błona biologiczna

wastewater aluminum electrodes contaminated water drinking water electrocoagulation removal nitrate denitrification technologies wastewaters

Wydawca

Politechnika Koszalińska

Czasopismo

Rocznik Ochrona Środowiska

Rocznik

2013

Tom

Tom 15, cz. 2

Strony

1952--1964

Opis fizyczny

Bibliogr. 25 poz., tab., rys.

Twórcy

autor

Kłodowska I.

Uniwersytet Warmińsko-Mazurski, Olsztyn

autor

Rodziewicz J.

Uniwersytet Warmińsko-Mazurski, Olsztyn

autor

Janczukowicz W.

Uniwersytet Warmińsko-Mazurski, Olsztyn

autor

Filipkowska U.

Uniwersytet Warmińsko-Mazurski, Olsztyn

Bibliografia

1. Bani-Melhem K., Smith E.: Grey water treatment by a continuous process of an electrocoagulation unit and a submerged membrane bioreactor system. Chemical Engineering Journal 198–199, 201–210 (2012).
2. Bayat O., Kilic O., Bayat B., Anil M., Akarsu H., Poole C.: Electrokinetic dewatering of Turkish glass sand plant tailings. Water Research 40, 61–66 (2006).
3. Chang C.C., Tseng S.K., Huang H.K.: Hydrogenotrophic denitrification with immobilized Alcaligenes eutrophus for drinking water treatment. Bioresource Technology 69, 53–58 (1999).
4. Chen X., Chen G., Yue P. L.: Separation of pollutants from restaurant wastewater by electrocoagulation. Separation and Purification Technology 19, 65–76 (2000).
5. Chen G.: Electrochemical technologies in wastewater treatment. Separation Purification Technology 38, 11–41 (2004).
6. Dash B. P., Chaudhari S.: Electrochemical denitrification of simulated ground water. Water Research 39, 4065–4072 (2005).
7. Emamjomeh M. M., Sivakumar M.: Review of pollutants removed by electrocoagulation and electrocoagulation/flotation processes. Journal of Environmental Management 90 (5), 1663–1679 (2009).
8. Gamagea N. P., Chellama S.: Aluminum electrocoagulation pretreatment reduces fouling during surface water microfiltration. Journal of Membrane Science 379 (1–2), 97–105 (2011).
9. Ghafari S., Hasan M., Aroua M.K.: Nitrate remediation in a novel upflow bio-electrochemical reactor (UBER) using palm shell activated carbon as cathode material. Electrochimica Acta 54, 4164–4171 (2009).
10. İrdemez S., Demircioğlu N., Yildiz Y. S.: The effects of pH on phosphate removal from wastewater by electrocoagulation with iron plate electrodes. Journal of Hazardous Materials 137 (2), 1231–1235 (2006).
11. Koparal A.S., Öğütveren Ü.B.: Removal of nitrate from water by ele¬ctroreduction and electrocoagulation. Journal of Hazardous Materials B 89, 83–94 (2002).
12. Lacasa E., Cañizares P., Sáez C., Fernández F.J., Rodrigo M.A.: Electrochemical phosphates removal using iron and aluminium electrodes. Chemical Engineering Journal 172 (1), 137–143 (2011).
13. Lee K.C., Rittmann B.E.: Applying a novel autohydrogenotrophic hollow-fiber membrane biofilm reactor for denitrification of drinking water. Water Research 36, 2040–2052 (2002).
14. Li M., Feng Ch., Zhang Z., Yang S., Sugiura N.: Treatment of nitrate contaminated water using an electrochemical method. Bioresource Technology 101 (16), 6553–6557 (2010).
15. Meas Y., Ramirez J. A., Villalon M. A., Chapman T. W.: Industrial wastewaters treated by electrocoagulation. Electrochimica Acta 55 (27), 8165–8171 (2010).
16. Mollah M.Y.A., Morkovsky P., Gomes J.A.G., Kesmez M., Parga J., Cocke D.L.: Fundamentals, present and future perspectives of electrocoagulation. Journal of Hazardous Materials 114, 199–210 (2004).
17. Mouedhen G., Feki M., De Petris Wery M., Ayedi H.F.: Behavior of aluminum electrodes in electrocoagulation process. Journal of Hazardous Materials 150 (1), 124–135 (2008).
18. Mousavi S., Ibrahim S., Aroua M.K., Ghafari S.: Development of nitrate elimination by autohydrogenotrophic bacteria in bio-electrochemical reactors – A review. Biochemical Engineering Journal 67, 251–264 (2012).
19. Rajeshwar K., Ibanez J.K.: Environmental Electrochemistry: Fundamentals and Applications in Pollution Abatement. Academic Press, San Diego, 234 (1997).
20. Rittmann B.E., Nerenberg R., Lee K.C., Najm I., Gillogly T.E., Lehman G.E., Adham S.S.: The hydrogen-based hollow-fiber membrane biofilm reactor (HFMBfR) for reducing oxidized contaminants. Water Science Technology.: Water Supply 4, 127–133 (2004).
21. Rodrigo M.A., Cañizares P., Buitrón C., Sáez C.: Electrochemical technologies for the regeneration of urban wastewaters. Electrochimica Acta 55 (27), 8160–8164 (2010).
22. Tchamango S., Nanseu-Njiki Ch.P., Ngameni E., Hadjiev D., Darchen A.: Treatment of dairy effluents by electrocoagulation using aluminium electrodes. Science of The Total Environment 408 (4), 947–952 (2010).
23. Tran N., Drogui P., Blais J.F., Mercier G.: Phosphorus removal from spiked municipal wastewater using either electrochemical coagulation or chemical coagulation as tertiary treatment. Separation and Purification Technology 95, 16–25 (2012).
24. Vasudevan S., Lakshmi J., Jayaraj J., Sozhan G.: Remediation of phosphate-contaminated water by electrocoagulation with aluminium, aluminium alloy and mild steel anodes. Journal of Hazardous Materials 164 (2–3), 1480–1486 (2009).
25. Yan M., Wang D., Qu J., He W., Chow C.W.K.: Relative importance of hydrolyzed Al(III) species (Ala, Alb, and Alc) during coagulation with polyaluminum chloride: a case study with the typical micro-polluted source waters. Journal Colloid Interface Science 316, 482–489 (2007).

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-86a65a10-7be7-4d94-95ee-38262f76d157