Microbial Treatment of Oil Contained Wastewater Discharged from Industrial Kitchen

概要

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The dimensions of a grease trap used in a restaurant were investigated. The size was dependent on the area of the space used for the grease trap rather than the flow rate of the wastewater and oil content. The oil and nitrogen concentrations of sixteen kitchen wastewater samples in a grease trap were measured. Most of wastewater samples contained oil over 0.03g hexane extract·L-1. The highest oil concentration, 2.12g hexane extract·L-1, was observed in the wastewater of the grease trap from a European food restaurant. In all the samples, the nitrogen concentration was extremely low for biological water treatment. To develop an efficient oil decomposition system for the wastewater treatment in an industrial kitchen, the optimum conditions for the oil decomposition by the yeast, Rhodotorula mucilaginosa, isolated from the grease trap of a restaurant were examined using artificial wastewater containing soybean oil. The optimum C/N ratio, temperature and pH were 31, 30°C and about 6, respectively. The oil decomposition rate in the actual wastewater of a restaurant was improved with the addition of the nutrients. It was estimated that the initial cell concentration required for perfect decomposition of 10g oil·L-1 for 8 hours might be 33g dry cells·L-1.
日本食品工学会の論文