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uv光氧催化设备之工业废水应用!

来源:http://www.spormac.net/   发布时间:2019-03-01 14:16:06
uv光氧催化设备之工业废水应用,化学及光催化氧化法是目前研究较多的一项氧化技术。所谓光催化反应,就是在光的作用下进行的化学反应。光化学反应需要分子吸收特定波长的电磁辐射,受激产生分子激发态
  Chemical and photocatalytic oxidation is one of the most widely studied oxidation technologies for industrial wastewater application of UV photocatalytic equipment. The so-called photocatalytic reaction is a chemical reaction under the action of light. Photochemical reactions require molecules to absorb electromagnetic radiation at specific wavelengths and stimulate to produce molecular excited states.
  1、含油废水
  1. Oily Wastewater
  近年来,利用半导体粉末的悬浮体系光催化降解水中有机污染物的研究引起各国学者的关注。杨阳、陈爱平等以膨胀珍珠岩为载体,用浸涂烧结法制备了漂浮负载型TiO2/EP光催化剂,并对制备催化剂的工艺条件及水面浮油的光催化降解过程进行了初步研究,结果表明经 7h 光照后该种催化剂能降解癸烷 95%以上,且能较长时间漂浮于水面,便于大面积抛洒并易于拦截和回收,具有实用开发价值。陈士夫等利用空心玻璃球负载 TiO2 清除水面漂浮的油层,在 375 W高压汞灯照射 120 min,正十二烷的光催化去除率为 93.5%, 80 min 甲苯的去除率达 100%。通入空气或加入 H2O2 可以大大地提高光催化的效果,当 H2O2 的量为 5.0 mmol/L时, 40 min 后, 甲苯的去除率达 100%。
  In recent years, photocatalytic degradation of organic pollutants in water by suspension system of semiconductor powder has attracted the attention of scholars all over the world. Yang Yang and Chen Aiping prepared floating supported titanium dioxide/EP photocatalyst with expanded perlite as carrier by dip-coating sintering method. The preparation conditions of the catalyst and the photocatalytic degradation process of oil slick on water surface were preliminarily studied. The results showed that the catalyst could degrade more than 95% of decane after 7 hours of illumination, and could float on water surface for a long time, so it was easy to spray in large area. It has practical development value in interception and recovery. Chen Shifu et al. used hollow glass spheres loaded with titanium dioxide to remove floating oil layers on the water surface. When exposed to 375 W high pressure mercury lamp for 120 minutes, the photocatalytic removal rate of n-dodecane was 93.5%, and the removal rate of toluene was 100% in 80 minutes. When the amount of hydrogen peroxide was 5.0 mmol/L, the removal rate of toluene reached 100% after 40 minutes.
光氧催化设备
  2、印染废水
  2. Printing and dyeing wastewater
  现在传统的处理方法,比如,吸附法,电化学法,电凝法,生物法等,只能把污染物从一种物相转化为另一种物相,不能使污染物得到分解或无害化,而光催化氧化能够把印染废水中的有害物质分解为 H2O、 CO2 等有机小分子和其他无害物质,消除了二次污染。王成国采用纳米级 TiO2 悬浮法光催化氧化处理直接耐晒翠蓝染液(染料浓度 100mg/L, TiO2 用量 1000mg/L),当光照时间大于 200min 时,色度去除率达到 93%, TOC去除率达到 50%。罗洁、陈建山对色度 375、 pH值 5.35、 CODcr 595.16 mg/L的模拟墨绿色印染废水采用光催化处理后脱色率达90%, CODcr 脱除率达 80%左右。
  At present, traditional treatment methods, such as adsorption, electrochemical, electrocoagulation and biological methods, can only transform pollutants from one phase to another, and can not make pollutants decomposed or harmless, while photocatalytic oxidation can decompose harmful substances in printing and dyeing wastewater into small organic molecules such as hydrogen peroxide, carbon dioxide and other harmless substances, eliminating secondary pollution. Wang Chengguo used nano-sized titanium dioxide suspension photocatalytic oxidation to treat direct light-resistant turquoise blue dye solution (dye concentration 100 mg/L, titanium dioxide dosage 1000 mg/L). When the illumination time was more than 200 minutes, the color removal rate reached 93%, TOC removal rate reached 50%. Luo Jie and Chen Jianshan used photocatalytic treatment to treat simulated ink-green printing and dyeing wastewater with color 375, pH 5.35 and CODcr 595.16 mg/L. The decolorization rate reached 90% and CODcr removal rate reached about 80%.
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