碱性消毒剂耦合低温热处理消毒医疗污泥

为填补医疗污泥清掏后的处理技术空白,以枯草芽孢杆菌黑色变种芽孢为指示菌,评价了碱性消毒剂耦合低温热处理对医疗污泥的消毒效果。结果表明:医疗污泥CaO消毒最适投加量为5%,热处理温度不宜低于70 ℃,在80 ℃条件下处理2 h,或70 ℃条件下处理4 h均可满足医疗污泥消毒要求(生物指示菌杀灭对数值≥4)。与单独使用5% CaO相比,加入1% NaOH可以使80,70 ℃下的热处理时间分别缩短至1,3 h。医疗污泥经碱性消毒后,脱水性能有效改善。该研究结果可为形成医疗污泥集中消毒处理技术提供理论依据和数据支撑。

A MEDICAL WASTEWATER SLUDGE DISINFECTION TECHNOLOGY OF ALKALINE DISINFECTANTS COUPLED WITH LOW-TEMPERATURE HEAT TREATMENT

To resolve the lack of medical sludge treatment technologies, the disinfection effect of alkaline disinfectants coupled with low-temperature heat treatment on medical wastewater sludge was evaluated by using Bacillus subtilis var. niger Spore as the indicator bacteria. The results indicated that the optimum dosage of CaO disinfection for medical wastewater sludge was 5%. The heat treatment temperature needed to be 70 ℃ above, and medical wastewater sludge disinfection requirements could be met by treating at 80 ℃ for 2 h, or 70 ℃ for 4 h. Compared with 5% CaO alone, adding 1% NaOH could shorten the treatment time at 80 ℃ and 70 ℃ to 1h and 3 h, respectively. The dewatering performance of medical wastewater sludge was effectively improved after alkaline disinfection. The results of this study can provide a theoretical basis and data support for the formation of centralized disinfection treatment technology for medical wastewater sludge.