Inactivation of wastewater by continuous heat sterilizer

The feature of the continuous heat sterilizer is that unit equipment is so compact. In the continuous heat sterilizer, the sterilization time is adjusted by the length of the heat retention pipe. Therefore, if the sterilization time can be shortened, it can be achieved further reduction the dimension of unit equipment. Hence, performance evaluation test was conducted by use of spore of G. stearothermophilus ATCC7953, which is considered to have the highest heat resistance. Under a general sterilization condition are 20 min at 121 ℃, however ,in this experiment, sterilization condition of 1 min at 134 ℃ are determined by D value and Z value of spore which is defined in the G. stearothermophilus ATCC7953. The continuous heat sterilizer was operated under above condition, and when spore solution (1.3×107 CFU/mL) was treated, the spore concentration of treated water was indicated 0 CFU/mL. As a result of above experiment, it is indicated that the sterilization time can be shortened by increasing the sterilization temperature and the dimension of unit equipment can be downsized.