Usuwanie ortofosforanów ze ścieków syntetycznych o niskim pH z wykorzystaniem metody roztwarzania metali i elektrokoagulacji

• Autorzy: Wysocka I. , Ładuch W

Warianty tytułu

EN

Orthophosphates removal from synthetic sewage with low pH using the electrocoagulation and the metal digestion method

• Języki publikacji: PL

Abstrakty

EN

Unquestionably, effective methods of phosphorus compound removal include precipitation methods. These methods include: electrocoagulation and the experimental metal digestion method. Metal solution and electrocoagulation in this paper use corrosion effect of steel plates to couse iron ions to get through into the synthetic wastewater. Iron ions that are present in solution induct deposition and sorption of phosphate compounds, which subsequently are removed. 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. Electrocoagulation requires the electrical current to be connected with electrodes. The research was conducted with usage of steel electrodes with 1414 cm² contact surface, which were corroding and releasing iron ions responsible for orthophosphate deposition. The electrocoagulation process was using a direct electrical current with intensity of 0.1 A. Synthetic wastewater containing 10.5 mg P/dm³ ortophosphorus and 3 pH was used. The main object of this paper was to compare electrocoagulation and metal solution as methods of phosphate removal from synthetic wastewater with usage of reactors containing steel electrodes. The analysis were conducted in acidic environment. Additionally there was examined content of the iron and pH in the solution. The article presents a study into comparative tests were conducted on a laboratory scale. The research indicates, that electrocoagulation is a method of wastewater treatment that takes less time than metal solution. Complete phosphate removal in the environment at pH 3 with electrocoagulation was achieved after 240 minutes, whereas with metal solution method it took 420 minutes. The downside of both methods is the secondary contamination of wastewater with iron ions.

Słowa kluczowe

EN

wastewater; coagulation; steel

• Wydawca: Politechnika Koszalińska
• Czasopismo: Rocznik Ochrona Środowiska
• Rocznik: 2012
• Tom: Tom 14
• Strony: 790--799
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Wysocka I.

• Uniwersytet Warmińsko-Mazurski, Olsztyn

autor

Ładuch W

• Uniwersytet Warmińsko-Mazurski, Olsztyn

Bibliografia

• 1. Chen G.: Electrochemical technologies in wastewater treatment. Sep.Purif. Technol 38, 11–41 (2004).
• 2. Duana J., Gregoryb J.: Coagulation by hydrolysing metal salts. Advances in Colloid and Interface Science 100–102, 475–502 (2003).
• 3. Simate, G.S., Cluett, J., Iyuke, S.E., Musapatika, E.T., Ndlovu, S., Walubita, L.F., Alvarez, A.E.: The treatment of brewery wastewater for reuse: state of the art. Desalination 273, 235–247 (2011).
• 4. Lai P., Zhao H., Wang Ch., Ni J.: Advanced treatment of coking wastewater by coagulation and zero-valent iron processes. Journal of Hazardous Materials 147, 232–239 (2007).
• 5. Mollah1 M. Y. A., Schennach R., Parga J.R., Cocke D. L.: Electrocoagulation (EC) — science and applications. Journal of Hazardous Materials B84, 29–41 (2001).
• 6. Sengila I.A., Ozacar M.: Treatment of dairy wastewaters by electrocoagulation using mild steel electrodes. Journal of Hazardous Materials B137, 1197–1205 (2006).
• 7. Schönborn A. Züst B. Underwood E.: Long Term Performance of the Sand-Plant-Filter Schattweid Switzerland. Wat. Sci. Tech. 35 (5), 307–314 (1997).
• 8. Simate G.S., Cluett J., Iyuke S.E., Musapatika E.T., Ndlovu S.,
• Walubita L.F., Alvarez A.E.: The treatment of brewery wastewater for reuse: state of the art. Desalination 273, 235–247 (2011).
• 9. Wysocka I., Giza M.N.: Porównanie efektów usuwania ortofosforanów ze ścieków metodą elektrokoagulacji i metodą roztwarzania. Rocznik Ochrona Środowiska 13, 1915–1925 (2011).
• 10. Wysocka I., Kościelniak T.: Wpływ napowietrzania na efektywność usuwania fosforu ze ścieków metodą roztwarzania metali. Inżynieria Ekologiczna 24, 154–163 (2011).
• 11. Wysocka I., Krzemieniewski M.: The effects of total phosphorus and orthophosphates removal with the method of metals solubilisation on steel, aluminum, and mixed media. Polish Journal of Natural Science 22 (4), 670–678 (2007).
• 12. 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 4, 81–84 (2009).
• 13. Yang H., Jing-Feng G., Fang-Qing F., Cheng L., Yong-Zhen P., Shu- Ying W.: The comparative study on the rapid decolorization of azo, anthraquinone and triphenylmethane dyes by zero-valent iron. Chemical Engineering Journal 179, 8–18 (2012).