Abstract: Aeration process for treatment of waste water containing high content of alkyl polyglucosides was investigated via study of effect of aeration diffuser disc aperture on foam performance,foam volume generated and organic matter degradation.Results showed that,following the reducing of the aeration diffuser disc aperture,bubble size of the foam and the foaming ratio gradually decreases;while the total liquid hold and half-life of the foam gradually increases.When the ozone introduced achieves 28 g,the total foam volume generated,the degradation level of COD of per gram ozone consumed and the degree of degradation of COD increases following the reducing of aeration diffuser disc aperture.Performance of combination of aeration diffuser discs with 150 and 40 μm apertures was compared with that of single 150 μm,the COD degradation of the former is 6.8 percent points higher than that of the latter,and COD degraded by one gram of ozone increases 54.5 mg.The utilization efficiency of ozone increases remarkably.Further,total foam volume generated by the combined aeration diffuser discs reduces by 2/3 as compared with that of single aeration diffuser disc with aperture of 80 μm.

Key words: alkyl polyglucosides, aeration process, ozonation, waste water