In this paper , an experimental investigation of the removal of volatile organic compounds ( voc ) from dilute aqueous solutions was presented by vacuum membrane distillation ( vmd ) . experiments were carried out using aqueous mixtures of ethanol with hollow fiber module . the influences of operating variables such as feed concentration , flow rate , temperature and downstream pressure on the flux and separation factor were investigated 本文对膜蒸馏脱除水溶液中的挥发性有机化合物( voc )进行了试验研究;文中以乙醇水溶液为研究对象,采用真空膜蒸馏法,膜材料为中空纤维膜,研究膜通量及分离因子与原料液的温度、浓度、流速,冷侧压力的关系,并对真空膜蒸馏的传热传质机理进行了初步探讨。
When a temperature inversion is formed in the pearl river delta ( prd ) region , or when a weak northerly or northwesterly wind prevails , ambient air pollutants ( including nitrogen oxides ( nox ) and volatile organic compounds ( voc ) ) in the region will be trapped easily in the lower atmosphere and cannot be dispersed effectively . the above factors , if coupled with strong sunlight , will generate ozone under photochemical reaction between nox and voc and lead to the phenomenon of photochemical smog 当珠江三角洲区域一带出现逆温层,或者吹微弱北或西北风时,区域内空气中的污染物(包括氮氧化物及挥发性有机化合物)很容易会被困在大气的低层,不能有效消散;如再加上强烈的阳光,氮氧化物与挥发性有机化合物便会产生光合化学反应,形成臭氧及引致光合化学烟雾现象。
To require importers or manufacturers of specified products to register the volatile organic compound ( voc ) contents of their products with the epd and provide labelling on the container or packaging of the products in an effort to reduce the occurrence of smog in the region caused by voc emissions ; and 规定指定制品的进口商或制造商须向环境保护署登记有关产品的挥发性有机化合物含量,以及在其容器或包装上附上标签,以减少由挥发性有机化合物产生的地区烟雾现象;以及