紫外线消毒在中央空调系统中的应用

简述了紫外线空气消毒的三种方法:风管内照法、房间上照法及独立紫外消毒,并对其消毒效果、影响因素及优缺点进行了分析;介绍了紫外线消毒在中央空调系统中的应用,并对应用中的相关问题进行了分析。     

水解酸化+接触氧化法+紫外线消毒处理医院污水

介绍水解酸化 接触氧化法 紫外线消毒工艺处理医院污水的工程设计、施工和运行情况。结果表明:处理系统运行稳定,操作管理简单方便,耐冲击负荷,运转费用低,处理效果好,出水水质优于广东省地方标准《水污染物排放限值》(DB44/26-2001)第二时段一级标准。     

Disinfection of Rice Seeds Prior to Sprouting

Different methods of rice seeds disinfection were investigated in order to limit the development of micro-organisms during sprouting. At room temperature, sodium hypochlorite at 1000 ppm or hydrogen peroxide resulted in a 2 to 3 log decrease in aerobic plate counts. Ethanol was found to inhibit germination, thus prohibiting its use. The limited effectiveness of decontaminating solutions could be because they did not access the bacteria, which was supported by the results of washing with benzalkonium chloride. Greater reduction (up to 5 log) was obtained by soaking seeds for 5 min in a sodium hypochlorite solution at 60°C.     

KCX-1型快速齿科手机消毒器

口腔齿科手机是HBV、HCV、HIV等血液传播性疾病和消化道传染病的传播媒介。采用激光泵浦光源在辐射过程中产生的瞬间高温、丰富的光谱分布的强光作为载体,对齿科手机进行快速、彻底、无损伤的消毒灭菌。     

二氧化氯消毒工艺在制水生产中的应用分析

獭湖水厂采用二氧化氯作为消毒剂。针对二氧化氯的投加方式、消毒效果、消毒成本进行了分析。研究结果表明二氧化氯作为一种高效、安全、无毒的的消毒剂在饮用水处理中有广阔的应用前景。     

管网中的饮用水消毒副产物研究进展

控制管网中消毒副产物生成是研究热点,对管网消毒副产物变化规律进行研究,可为控制管网消毒副产物提供指导。在管网中,余氯、季节变化和管材是影响管网消毒副产物的重要因素,余氯量越大,THMs和HAAs的量就越多;季节变化主要会影响化学作用和微生物活性,消毒副产物的生成速率随温度的升高而显著加快,夏秋生成的消毒副产物更多,春冬生成的消毒副产物相对少一些;铁管的腐蚀能使消毒副产物增加,但产生的Fe2＋也能使部分消毒副产物被还原。HAAs与AOC前体物间具有相似性,含量呈正相关性,存在较好的线形关系。     

基于EM78P419N单片机的消毒烘干机的设计

为了改善传统烘干机烘手时间长、易交叉感染、可靠性低等问题,进行了消毒干手机的设计。该设计利用红外技术检测信号,再将光信号转换成电信号送入EM78P419N单片机,通过单片机的处理后,启动电磁阀和滴水泵进行消毒。定时完成后,启动加热器和风扇进行烘干。整个过程完全自动控制,避免了交叉感染,手伸即喷,手离即停。同时,研制出的样品具有成本低、体积小、可靠性高、干手时间短等优点,在各类人员聚集或流动的场所应用广泛。     

谈污水处理中的紫外线消毒

简述了城市污水消毒标准与消毒方法,阐明了紫外线消毒的消毒机理,比较了液氯消毒与紫外线消毒的优缺点,并进行经济比较,认为紫外线消毒是更为经济的,并且具有光谱性,在中国的城市污水处理尾水消毒领域是值得推广的好工艺。     

谈生活用水中心二氧化氯消毒

讨论了二氧化氯的性质,简单介绍了二氧化氯的制备及其杀菌、灭藻、消毒、除臭和脱色机理,以及在其他领域的应用,指出该方法具有广谱、高效、安全等优点,值得大力推广。     

Effects of primary sludge particulate (PSP) entrapment on ultrasonic (20 kHz) disinfection of Escherichia coli

The role of primary sludge particulates (PSPs) in ultrasonic disinfection of Escherichia coli (E. coli) was investigated. Entrapment of E. coli by PSP was directly observed through scanning electron microscope (SEM) after E. coli and PSP were incubated together in water for 24 h at 35 °C. Entrapment coefficient was proposed for the first time to reflect the ability of PSP to entrap E. coli and was estimated as 1.4 × 10³ CFU/mg PSP under our experimental conditions. Ultrasonication (20 kHz) of different E. coli-PSPs solutions showed that the entrapped E. coli cells were protected by PSP from ultrasonication and the unentrapped cells were not. However, the protection of entrapped E. coli cells gradually decreased as ultrasonication proceeded, suggesting the ability of power ultrasonication to deprotect the entrapped E. coli cells. SEM studies suggested a two-step mechanism for ultrasonic (20 kHz) disinfection of entrapped E. coli: breakdown of the protective PSP refugia and disinfection of the exposed E. coli cells. This research will enable more informed decisions about disinfection of aqueous samples where porous PSP are present.