【作者】 陈新丽；

【导师】 吴克明；

【作者基本信息】 武汉科技大学 ， 环境工程， 2005， 硕士

【摘要】 焦化废水是煤在高温干馏过程中以及煤气净化、化学产品精制过程中形成的废水,其中含有酚、氨氮、氰、苯、吡啶、吲哚和喹啉等几十种污染物,成分复杂,污染物浓度高、色度高、毒性大,性质非常稳定,是一种典型的难降解有机废水。本论文采用混凝-气浮法对某焦化厂的焦化废水进行了处理。 气浮是一种常用的高效固液分离工艺。在废水处理中,为充分发挥其去除性能,通常向水中投加混凝剂,使污染物质脱稳、凝聚,从而达到净化水质的目的。目前对混凝的研究较多,但都基于混凝—沉淀进行的。本文尝试采用混凝-气浮法对焦化废水的预处理的进行了研究,试验结果表明:混凝-气浮法处理焦化具有用药量低、气浮时间短、净化效果好的优点,其浊度、色度和COD的去除率分别达98.8%、57.1%和57.3%。而且不同絮凝剂对于焦化废水处理效果不同,复配药剂的处理效果要优于单一絮凝剂,无机和有机絮凝剂配合使用有利于降低药耗和提高净水效果。 试验中还对电凝聚法处理焦化废水进行了探讨,试验结果表明电凝聚处理焦化废水有一定的效果。在原水的浊度为190,色度为275,COD为3250mg/L时,电凝聚对焦化废水浊度、色度和COD去除率分别达到99.6%、54.89%和22.89%。更多还原

【Abstract】 Coking wastewater is produced by the pyrolysis (heating in absence of air) of suitable grades of coal, coal gas purifying and in the process of refining chemical products. There are many pollutants in the wastewater, such as hydroxybenzene, ammonia (usually recovered ammonium sulfate), cyanogen , phenol, indole uinnoline and so on.. Components in the wastewater are very complicated. Concentration of the pollutants, its color and toxicity are high. And its character is stabilized. Coking wastewater is a kind of typical refractory one. In the study. the method of coagulation- air flotation was adopted to treat coking wastewater.The process of air flotation is often used in the treatment of water and waster water as an effective method to separate the solid form the water. In order to make full use of the removal capability of it, it is usual to cast coagulant into wastewater to make the pollutant unstable and coagulated so as to make the water purified. Most of studies of coagulation were carried out based on the sedimentation at present. In this paper, the research studies feasibility that coagulant-air flotation acts as pretreatment. The experimental results show coagulant consumption is low, the flotation time is short and the purification efficiency is high. The purification efficiency of turbidity , chroma and COD are98.8%, 57.1% and 57.3% respectively. Different coagulation have different efficiency. If complex reagent is adopted, its purification efficiency is higher and its consumption is lower than the corresponding index of the single coagulation.Electro-coagulation dealing with coking wastewater goes on the discussion also in testing, the result of the test indicates that there has an effect that electro-coagulation dealing with coking wastewater. When turbidity of the wastewater is 190, chroma is 275, COD is 3250mg/L, after electro-coagulation deals with coking wateswater, the purification efficiency of turbidity . chroma and COD are 99.6%, 54.89% and 22.89% respectively.更多还原