臭氧氧化法处理城市污水厂出水的实验研究

为了开发污水的回用技术，对北京市某污水处理厂二处理后出水中含有的有机物进行了臭氧无催化氧化、臭氧碱催化氧化、臭氧／过氧化氢氧化和臭氧加过渡性金属离子／过氧化氢催化氧化工艺的实验研究。结果表明，自氧／过氧化氢氧化工艺达到了较好的效果，在Ｈ２Ｏ２＝３ｍｇ／Ｌ时投加臭氧１３ｍｇ／Ｌ，ＣＯＤｃｒ由４５ｍｇ／Ｌ降至２０ｍｇ／Ｌ。     

Ozone–dioxane delignification from the cell walls of Japanese cypress (Chamaecyparis obtusa Endl.)

Delignification from the cell walls with a combination of ozone oxidation and dioxane–water extraction using thin sections of a softwood, Japanese cypress (Chamaecyparis obtusa Endl.), was studied to determine its suitability for the production of recyclable cellulose-based materials from wood waste. The visible-light absorption spectra of treated wood sections revealed that delignification from the cell walls with ozone increased with increasing ozonization time. Ozone delignification proceeded from the lumen side toward the middle lamella within the secondary wall of a cell, and it proceeded faster in early wood than in late wood within an annual ring. Mild ozonization for 10–30 min was sufficient for the removal of lignin from the cell walls when sections were extracted with dioxane after ozonization. The results obtained here demonstrate that microspectrometry coupled with the Wiesner reaction is useful for the quantitative analysis of lignin in cell walls.     

臭氧处理印染废水的方法研究

目前印染废水大都采用混凝加生化的联合处理工艺 ,但处理后出水的CODcr和色度去除率低 ,尤其对高分子合成浆料和人工合成染料的处理率更低。文中选择了较为典型的印染废水用臭氧氧化的方法进行处理 ,并在不同的pH、温度、接触时间、初始浓度、UV状态下 ,通过试验探索其氧化降解过程及氧化机理 ,取得了较为满意的试验效果。     

臭氧氧化降解除草剂草甘膦的实验研究

以有机磷农药草甘膦作为目标污染物,进行了臭氧氧化试验.研究了不同臭氧投量、草甘膦初始浓度、初始pH对臭氧氧化去除草甘膦的影响,并对降解途径进行了探究.实验结果表明：臭氧投量越大,草甘膦初始浓度越低,臭氧氧化草甘膦的反应速率越快;不同pH条件下,碱性体系中草甘膦的去除速率最快,中性次之,酸性体系中草甘膦的去除速率最慢;臭...