tailieunhanh - Báo cáo " Bioremediation of vegetable oil and grease from polluted wastewater in dairy factory "

Vegetable oil and grease polluted wastewater caused many problems in wastewater plan such as physical blockages in sewer, pump, screens and filter distributor arms. Its occurrence in effluent increase COD significantly even its amount is not high. In this paper, bioremediation was investigated to remove vegetable oil and grease. Four strains were positive with lipid degrading test. Cell morphology and optimal conditions such as pH, temperature anf lipid concentration was found. | VNU Journal of Science Natural Sciences and Technology 24 2008 56-62 Bioremediation of vegetable oil and grease from polluted wastewater in dairy factory Le Duc Manh Food Industries Research Institute FIRI 301 Nguyen Trai Hanoi Vietnam Received 31 March 2008 Abstract. Vegetable oil and grease polluted wastewater caused many problems in wastewater plan such as physical blockages in sewer pump screens and filter distributor arms. Its occurrence in effluent increase COD significantly even its amount is not high. In this paper bioremediation was investigated to remove vegetable oil and grease. Four strains were positive with lipid degrading test. Cell morphology and optimal conditions such as pH temperature anf lipid concentration was found. The lipid-degrading activity of A12 B13 and D15 was highest at 30oC and pH 7 while that of D14 is at 34oC and pH . The result also showed that the highest lipase production of strains A12 B13 and D14 were observed at w v of lipid but for strain E15 concentration of lipid was w v. Addition of antifoam and surfactant was studied. The optimal concentration of antifoam CF-18 and surfactant PVA was found as w v and w v respectively. 10 w v of straw in the best ration of support particle at which the cell density of bioremediatior was 2x108 cfu g. The best temperature for storage was 5-7oC even so at the conditioned temperature 20-25oC the bioremediation was good until 20 weeks. At optimal moisture 10 and under low temperature 5-6oC the bioremediator was still as good as its initial after 20 weeks. Application of bioremediator in 25 m3 day wastewater treatment plan indicated that COD removal yield increased s6-7 compared with normal case no bioremediation . Keywords Bioremediation fat-oil and grease FOG wastewater treatment FOG removal. 1. Introduction Vegetable and animal oils and greases are handled in specific types of industries such as oil extraction from plant grains including olive oil and palm oil mills .