DEVELOPMENT OF AN ULTRASONIC TECHNIQUE TO ASSESS OIL AND GREASE CONTENTS IN BIOFUEL WASTEWATER

Química Nova

Costa-Félix, Rodrigo P. B.¹  Figueiredo, Monique Kort-Kamp¹  Instituto Nacional de Metrologia, Qualidade e Tecnologia, Duque de Caxias, Brasil¹  Silva, Luciano Segné F.¹  Bibiano, Douglas S.¹ 

关键词:  ultrasound;    biofuel wastewater;    oil-in-water emulsion;    metrology;   

DOI  :  10.5935/0100-4042.20150153

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Ultrasound as a metrology tool has many applications in health care, industrial, and chemical analyses. Ultrasonic techniques are rapid, low-cost, non-invasive, and highly repeatable. Although ultrasound can be used to measure emulsions, no effort had been made thus far to optimize its sensitivity for metrological analysis. In this work, a technique for analyzing oil in water was validated. The wave velocity and attenuation were chosen as the ultrasonic parameters. The technique was implemented in the boundary region established by law for effluents from industrial plants involved with biofuel manufacturing. A technical effort of this study was to establish stable emulsions in concentrations close to the desired limit of study. The phase behaviours of pseudo-ternary oil, sodium chloride, and sodium lauryl sulphate were studied. The composition in the widest region of the diagram allowed for the formation of a stable emulsion, from which the ultrasound measurement was carried out. An analytical curve was obtained using ultrasonic attenuation to determine the content of oils and greases in wastewater ranging 15–240 ppm. The speed of sound did not appear to be an applicable parameter for this application. The technique was demonstrated to be an important alternative solution for the continuous monitoring of wastewater with regard to oil concentrations.

【 授权许可】

Unknown