摘要
根据高位水箱二次供水系统的水质和水力条件等特点,采用UV-TiO_2对二次供水进行了消毒效能研究,并与UV消毒进行了对比。结果表明,随着流量的增加,UV-TiO_2消毒和UV消毒的微生物灭活率逐步降低;随着消毒时间的增加,UV-TiO_2消毒和UV消毒的微生物灭活率呈现出由增加到逐步稳定的趋势。过短的UV-TiO_2单次消毒时间会造成光催化氧化作用显著减弱,并且无法通过增加消毒周期得到有效增强。UV-TiO_2的消毒效能优于UV消毒;UV-TiO_2消毒对氯含量衰减的影响程度明显小于UV消毒,但经过UV-TiO_2消毒和UV消毒后的氯含量衰减速率均显著加快。在实验流量范围内,单次UV-TiO_2消毒可以使细菌总数超标2~10倍的二次供水消毒达标,可作为一种有效的二次供水绿色安全消毒方法。
According to the characteristics of water quality and hydraulic conditions of secondary water supply of high cistern system, the ultraviolettitanium dioxide （UV/TiO2） was used to disinfect secondary-supply water and compared with ultraviolet （UV） disinfection. The results showed that the disinfection rate by UV/TiO2 techhique and UV technique decreased with the increase of flow rate, and continued to increase and then stabilized with the increasing of disinfection time. A short UV/TiOz single disinfection time could weaken photocatalytic oxidation and could not be effectively enhanced by increasing the disinfection cycles. The inactivation efficacy of UV/TiO2 technique was better than that of UV technique. The effect of UV/TiO2 technique on residual chlorine decay was significantly lower than that of UV technique. Within the range of experimental flow, secondary-supply water which the total number of bacteria exceeded 2-10 times would reach the standard by UV/TiO2 single disinfection, which showed the UV/TiO2 technique was an environmental safe effective process to disinfect secondary-supply water.
出处
《水处理技术》
CAS
CSCD
北大核心
2017年第12期83-88,94,共7页
Technology of Water Treatment
基金
国家科技重大专项课题(2014ZX07406002)
