Chemical and Process Engineering, University of Surrey, Guildford GU27XH, United Kingdom.
Department of Microbial Sciences, University of Surrey, Guildford GU27XH, United Kingdom.
Ultrason Sonochem. 2020 Jun;64:104986. doi: 10.1016/j.ultsonch.2020.104986. Epub 2020 Jan 23.
This work reports the influence of ultrasound alone and combined with ozone for the treatment of real abattoir wastewater. Three different frequencies were studied (44, 300 and 1000 kHz) at an applied power of 40 W. The injected ozone dose was fixed at 71 mg/L and the treatment time varied from 1 to 60 min. Using ultrasound alone, 300 kHz was the only frequency showing a reduction in chemical oxygen demand (COD, 18% reduction) and biological oxygen demand (BOD, 50% reduction), while no diminution in microbial content was measured for any of the frequencies studied. Combining ultrasound with ozone, on the contrary, led to a significant decrease in COD (44%) and BOD (78%) removal for the three frequencies under study. A complete inactivation of total coliforms (TC) was obtained, as well as a final value of 99 CFU/mL in total viable counts (TVC, 5 log reduction). That is, the ozonation-sonication combined system was the only treatment method (compared to sonication and ozonation alone) reaching direct discharge limits, as well as meeting drinking water standards for microbial disinfection (TC and TVC).
本研究报告了单独使用超声和联合臭氧处理实际屠宰废水的影响。研究了三种不同的频率（44、300 和 1000 kHz），施加功率为 40 W。注入的臭氧剂量固定为 71 mg/L，处理时间从 1 分钟到 60 分钟不等。单独使用超声时，只有 300 kHz 的频率显示出化学需氧量（COD，降低 18%）和生物需氧量（BOD，降低 50%）的减少，而研究的任何频率均未测量到微生物含量的减少。相反，将超声与臭氧联合使用，三种频率下的 COD（44%）和 BOD（78%）去除率均显著降低。总大肠菌群（TC）被完全灭活，总活菌计数（TVC，降低 5 个对数级）的最终值为 99 CFU/mL。也就是说，与单独超声和臭氧处理相比，臭氧-声化学联合系统是唯一一种达到直接排放限值并满足饮用水微生物消毒标准（TC 和 TVC）的处理方法。
