The use of flotation to pretreat wastewater from animal fat rendering

• Autorzy: Żak S. , Zabłocki L.
• Języki publikacji: EN

Abstrakty

EN

A developed method of pretreating meat-processing wastewater from steam-rendering animal fats has been presented in this paper. The project also permits fats and proteins recovery for industrial applications. The method is based on the application of the air stream flotation chemically aided by coagulation, sorption and oxidation. A particular advantage of this method is the possibility of direct pretreatment of hot raw wastewater. Then, the process of pretreatment is carried out in two stages: the first including sorption, coagulation, and preliminary oxidation, and the second one with secondary coagulation and flotation aided by oxidation. A three-chamber induced air flotator of special design has been constructed for the practical application of this method, where the first chamber was of the processing character and the other two were the sorption ones. The full installation consisted of reaction chambers and the specially designed flotator. The application of this method permits 95% reduction of fats, suspended solids as well as fatty and protein colloids, more than 50% reduction of COD and 40% of BOD5. This design was implemented in order to eliminate fats and proteins and to pretreat processing wastewater up to the volume of 30.0 m^3 d^-1.

Słowa kluczowe

EN

wastewater from animal fats processing; flotator; separation of fats and proteins; coagulation; sorption; induced air flotation; oxidation; hydrogen peroxide

PL

ścieki; tłuszcz zwierzęcy; flotacja; koagulacja; sorpcja

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2005
• Tom: Vol. 7, nr 2
• Strony: 94--99
• Opis fizyczny: Bibliogr. 22 poz., tab., rys.

Twórcy

autor

Żak S.

• University of Technology and Agriculture, Faculty of Technology and Chemical Engineering, ul. Seminaryjna 3, 85-326 Bydgoszcz

autor

Zabłocki L.

• Department of Research and Implementation, Projprzem-EKO Sp. z o.o., ul. Osiedlowa 1, 89-203 Zamość n. Bydgoszcz, Poland

Bibliografia

• (1) Niewiadomski H.: Edible Fat Processing, Scientific Publishers WNT Warsaw, 1993, 110 - 118 (in Polish).
• (2) Rüffer H., Rosenwinkel K. H.: Taschenbuch der Industrieabwasserreinigung. Oldenbourg Verlag, München Wien, 1991, 115 - 134.
• (3) Niewiadomski H., Szczepańska H.: By-products Fatty Wastes. The Use and Effect on Environment, Scientific Publishers PWN Warszawa, 1989, 214 - 223 (in Polish).
• (4) Cavey A., Eyars R., Hill S., Simpson A., Kubicki M., Niewiadomska U., Orzeszko G., Sarnacka A.: Environment Protection in Fat Processing, General Guide. Publishing House of FAPA, the work edited by Kubicki M., Warsaw 1998, 56 - 73 (in Polish).
• (5) Żak S., Karkocha W.: The method of separating and treatment of fatty acids in wastewaters, 2003, Pol. Pat. Apll., No. P. 358413.
• (6) Halliday P. J., Beszedits S.: Proteins from food processing wastewaters. Eng. Digest, 1984, 30, 24 - 29.
• (7) Suzuki Y., Maruyama T.: Removal of suspended solids by coagulation and foam separation using surface-active protein. Water Res., 2002, 36, 295 - 2204.
• (8) Żak S.: The method of defatting and deproteinizing, 2003, Pol. Pat. Apll., No. P. 363662.
• (9) Żak S.: The method of eliminating fats and proteins from wastewaters, 2003, Pol. Pat. Apll., No. P. 363664.
• (10) Żak S., Zabłocki L., Merda J.: Fatty wastewater treatment plant, 2001, Pol. Pat. Apll., No. P. 350875.
• (11) Żak S., Barys M.: Full-scale experiment on the process of hydrogen peroxide aided flotation, 2004, paper directed for editorial Water Environ. Res.
• (12) Bremmell K. E., Jameson G. J., Farrugia T. R.: Agglomeration of fats and proteins, Chem. Eng. Aust., 1994, 19, 23 - 26.
• (13) Friedman M., Zahnley J. C. Masters P. M.: Relationship between in vitro digestibility of casein and its content of lysinoalanine d-amino acids, J. Food Sci., 1981, 46, 127 - 131.
• (14) Pelroy G. A., Spinelli J.: Availability of amino acids in sarcoplasmic fish proteins complexed with sodium hexametaphosphate, J. Food Sci., 1971, 36, 144 - 146.
• (15) Spinelli J., Koury B.: Phosphate complexes of soluble fish proteins, J. Agr. Food Chem., 1970, 18(2), 284 - 288.
• (16) Ziemiański Ś., Budzyńska-Topolewska J.: Food fats and systemic lipides, Scientific Publishers WNT Warsaw, 1991, 89 - 94 (in Polish).
• (17) Schults G. W., Russell D. R., Wierbicki E.: Effect of condensed phosphates on pH, swelling and water-holding capacity of beef, J. Food Sci., 1972, 32, 860 - 864.
• (18) Hermanowicz W., Dojlido J., Dożańska W., Koziorowski B., Zerbe J.: Physico-chemical analysis of water and sewage. Scientific Publishers Arkady Warsaw 1999 (in Polish).
• (19) Talinli I., Anderson G. K.: Interference of hydrogen peroxide on the standard COD test, Water Res., 1992, 26, 107 - 110.
• (20) Krause A.: Pflanzliche und tierische Fette in ihrer Wirkung auf Mikroorganismen in biologischen Kläranlagen, Fette-Seifen-Anstrichmittel, 84. Jahrg., 1. Sonderheft, 1982, 536 - 543.
• (21) Stauffer C. E.: Emulsifiers, Scientific Publishers WNT Warsaw, 2001, 35 - 49 (in Polish).
• (22) http://www.h2o2.com/applications/industrialwastewater.