Porównanie efektów usuwania ortofosforanów ze ścieków metodą elektrokoagulacji i metodą roztwarzania metali

• Autorzy: Wysocka I. , Giza M. N.

Warianty tytułu

EN

Comparison of the results of orthophosphates removal from sewage using electrocoagulation method and metal digestion method

• Języki publikacji: PL

Abstrakty

PL

Celem niniejszych badań było porównanie efektów usuwania związków fosforu (ortofosforanów) z wód z dodatkiem ortofosforanów, z wykorzystaniem dwóch metod: metody elektrokoagulacji (z wykorzystaniem procesów elektrochemicznych z użyciem prądu stałego) i metody roztwarzania metali (z wykorzystaniem procesów korozyjnych).

EN

There is a search in progress for some efficient methods of removing biogenic compounds from the treated sewage. Unquestionably, effective methods of phosphorus compounds removal include precipitation methods. The most common is the chemical precipitation method based on applying iron, aluminium or calcium salt to the solution and electrocoagulation. These methods utilise low solubility of metal phosphates and their sorption on the surfaces of the forming agglomerates. The real mechanism is quite complicated and consists of transforming phosphorus compounds into insoluble forms, and then separating them from the sewage by flotation, sedimentation, filtration. The method of iron solution should also be accounted into similar physical and chemical methods. The main difference between the aforementioned methods lies in the way of applying the precipitation agent to the solution. The method of iron solution is based on similar premises as the electrocoagulation method, however, metal ions here are dissolved into the solution as a result of spontaneous corrosion processes and, due to the further transformations in the sewage environment, they are to be responsible for phosphorus removal. The article presents comparative tests on a laboratory scale. The electrocoagulation method and metal digestion method were compared with regard to the effectiveness of orthophosphates removal from synthetic sewage. The comparison of both methods suggests that they can bring similar results of removing phosphorus (ortophosphates) from sewage. The process of reduction of concentration of orthophosphates in sewage occurs faster when the electrocoagulation method is used. However, with a longer test duration, better results are achieved using the metal digestion method. It was also noted that both methods introduce different amounts of iron into the solution. The methods differ with regard to the amount of iron remaining in the sewage in a suspended form. This indicates a better use of iron ions in the metal digestion method and it slightly limits the problem of an excessive amount of sludge.

Słowa kluczowe

PL

ortofosforanty; roztwarzanie metali; elektrokoagulacja

EN

orthophosphates; dissolution of metals; electrocoagulation

• Wydawca: Politechnika Koszalińska
• Czasopismo: Rocznik Ochrona Środowiska
• Rocznik: 2011
• Tom: Tom 13
• Strony: 1915--1925
• Opis fizyczny: Bibliogr. 14, poz., tab., rys.

Twórcy

autor

Wysocka I.

autor

Giza M. N.

• Uniwersytet Warmińsko-Mazurski, Olsztyn

Bibliografia

• 1. Huang Y. H., Hang T. C.: Effects of dissolved oxygen on formation of corrosion products and concomitant oxygen and nitrate reduction in zerovalent iron systems with or without aqueous Fe2+. Water Research, 39, 1751÷1760, 2005.
• 2. Chih-Hsiang L., Shyh-Fang K., Yu-Wei H.: Zero-valent iron reduction of nitrate in the presence of ultraviolet light, organic master and hydrogen peroxide. Water Research 37, 4109÷4118, 2003.
• 3. Kyung-Hee S., Cha D. K.: Microbial reduction of nitrate in the presence of nanoscale zero-valent iron. Chemosphere 72, 257÷262, 2008.
• 4. Manta R., Taylor K. E., Biswas N., Bewtra J. K.: A continuous system for Fe0 reduction of nitrobenzene in synthetic wastewater. Environ. Sci. Technol. 35 (15), 3231÷3236, 2001.
• 5. Bayramoglu M., Kobya M., Can O. T., Sozbir M.: Operating cost analysis of electrocoagulation of textile dye wastewater. Separation and Purification Technology 37, 117÷125, 2004.
• 6. Sunger N., Bose P.: Autotrophic denitrification using hydrogen generated from metallic iron corrosion. Bioresource Technology 100, 4077÷4082, 2009.
• 7. Irdemez S., Demircioglu N., Yildiz Y. S., Bingul Z.: The effects of current density and phosphate concentration on phosphate removal from wastewater by electrocoagulation using aluminium and iron plate electrodes. Separation and Purification Technology 52, 218÷223, 2006.
• 8. Wysocka I., Krzemieniewski M.: The influence of the metal dissolution process on the final effect of phosphorus compounds removal from treated sewage. Polish Journal of Environmental Studies, Vol. 17, No. 3A, 596÷600, 2008.
• 9. Wysocka I.: The problem of secondary contamination of sewage with iron compounds during the process of sewage treatment with the method of metal dissolution. Polish Journal of Environmental Studies, Series of Monographs, Vol. 4, 81÷84, 2009.
• 10. Wysocka I.: The value of pH reaction, salinity, alkaline and acidity of sewage during the process of phosphorus compound removal using the metal dissolution method in comparison with other physical and chemical methods. Polish Journal of Environmental Studies, Vol. 18, No. 3A, 463÷468, 2009.
• 11. Laruea O., Vorobieva E., Vub C., Durandb B.: Electrocoagulation and coagulation by iron of latex particles in aqueous suspensions. Separation and Purification Technology 31, 177 – 192, 2003.
• 12. Daneshvar N.; Ashassi-Sorkhabi H., Tizpar A.: Decolorization of orange II by electrocoagulation method. Separation and Purification Technology 31, 153÷162, 2003.
• 13. Mollah M.Y.A., Schennach R., Parga J.R., Cocke D.L.: Elactrocoagulation (EC) – science and applications. Journal of Hazardous Materials, B84, 29÷41, 2001.
• 14. Duan J., Gregory J.: Coagulation by hydrolysing metal salts. Advances in Colloid Interface Science, 100-102, 475÷502, 2003.